CN106971423B - Drawing method, device and equipment of cubic graph and storage medium - Google Patents

Abstract

The invention discloses a method, device, equipment and storage medium for drawing cube graphics. The method includes: acquiring a first coordinate value of a first drawing point formed by a cursor drawing point in a canvas; monitoring and acquiring the current coordinate value corresponding to the movement of the cursor drawing point; according to the first coordinate value, the current coordinate value and a preset standard With reference to the information, determine the adsorption coordinate value of the adsorption point required to draw the cube to be drawn; determine that the first drawing point and the adsorption point are the vertices of the cube to be drawn, and determine the coordinates of the remaining vertices according to the adsorption coordinate value and the first coordinate value value and highlight it to connect the vertices to form the cube to draw. Using this method, the coordinate values of the key points required to draw the cube can be determined in the canvas, and the coordinates of the vertices constituting the cube can be determined according to the key points, which can simply and conveniently realize the precise drawing of the cube, thereby better enhancing the electronic User experience of the drawing function in the whiteboard.

Description

Method, device, device and storage medium for drawing cube graphics

technical field

The present invention relates to the technical field of electronic whiteboards, and in particular, to a method, device, device and storage medium for drawing cube graphics.

Background technique

With the development of electronic technology, more and more electronic devices with interactive functions appear in people's study, work and life. Electronic whiteboard is a common interactive function software in electronic devices, which has functions of writing, annotation, painting and multimedia. Interactive functions such as entertainment.

When the user draws on the electronic whiteboard, if it is a two-dimensional geometric figure, the user can also determine the required figure size according to the ruler displayed on the canvas. However, when drawing a three-dimensional cube, it is difficult for the user to draw a A standard cube with equal length, width and height, which greatly affects the user experience.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide a method, device, device and storage medium for drawing cube graphics, which can solve the problem that a user cannot quickly draw a cube on an electronic whiteboard.

On the one hand, an embodiment of the present invention provides a method for drawing a cube shape, including:

Obtain the first coordinate value of the first drawing point formed by the cursor drawing point in the canvas;

Monitor and obtain the current coordinate value corresponding to the movement of the cursor drawing point in the canvas;

According to the first coordinate value, the current coordinate value and the preset standard reference information, determine the adsorption coordinate value of the adsorption point required to draw the cube to be drawn;

Determine that the first drawing point and the adsorption point are the vertices of the cube to be drawn, and determine the coordinate values of the remaining vertices of the cube to be drawn according to the adsorption coordinate value and the first coordinate value, and highlight them to connect Each vertex forms the cube to be drawn.

On the other hand, an embodiment of the present invention provides a device for drawing cube graphics, including:

a first coordinate obtaining module, used for obtaining the first coordinate value of the first drawing point formed by the cursor drawing point in the canvas;

a moving coordinate obtaining module, used to monitor and obtain the current coordinate value corresponding to the cursor drawing point when moving in the canvas;

an adsorption coordinate acquisition module, configured to determine the adsorption coordinate value of the adsorption point required to draw the cube to be drawn according to the first coordinate value, the current coordinate value and the preset standard reference information;

A graphics drawing module, configured to determine that the first drawing point and the adsorption point are the vertices of the cube to be drawn, and determine the coordinate values of the remaining vertices of the cube to be drawn according to the adsorption coordinate value and the first coordinate value and highlighted to connect the vertices to form the cube to be drawn.

In another aspect, an embodiment of the present invention provides an electronic device, including:

one or more processors;

a storage device for storing one or more programs;

The one or more programs are executed by the one or more processors, so that the one or more processors implement the method for rendering cube graphics provided by the embodiments of the present invention.

In another aspect, an embodiment of the present invention provides a computer-readable storage medium on which a computer program is stored, and when the program is executed by a processor, implements the method for drawing a cube graph provided by the embodiment of the present invention.

In the above-mentioned method, device, device and storage medium for drawing a cube graph, firstly obtain the first coordinate value of the first drawing point formed by the cursor drawing point in the canvas; then monitor and obtain the corresponding movement of the cursor drawing point in the canvas Then determine the adsorption coordinate value of the adsorption point required to draw the cube to be drawn according to the first coordinate value, the current coordinate value and the preset standard reference information; finally determine that the first drawing point and the adsorption point are the cube to be drawn. vertices, and determine the coordinate values of the remaining vertices in the cube to be drawn according to the adsorption coordinate value and the first coordinate value, so as to connect the vertices to form the cube to be drawn. The above-mentioned method, device, device and storage medium for drawing a cube graph can determine the coordinate values of the key adsorption points required for drawing the cube on the canvas, and determine the coordinates of other vertices constituting the cube according to the key adsorption points, so that the cube can be realized simply and conveniently. , which better enhances the user experience of the drawing function in the electronic whiteboard.

Description of drawings

1 is a schematic flowchart of a method for drawing a cube graph according to Embodiment 1 of the present invention;

2a is a schematic flowchart of a method for drawing a cube figure according to Embodiment 2 of the present invention;

Fig. 2b is the specific operation flow chart of carrying out standard reference information determination in the second embodiment of the present invention;

Figure 2c is a schematic diagram of the projection of the standard cube model on the canvas when the standard reference information is determined;

Fig. 2d is a specific operation flow chart for determining the adsorption coordinate value in the second embodiment of the present invention;

FIG. 2e is an effect display diagram when the first adsorption coordinate value is determined;

Figure 2f is an effect display diagram when the second adsorption coordinate value is determined;

2g is an example diagram of a cube to be drawn determined according to the adsorption coordinate value of the adsorption point;

FIG. 3 is a structural block diagram of a device for drawing cube graphics according to Embodiment 3 of the present invention;

FIG. 4 is a schematic diagram of a hardware structure of an electronic device according to Embodiment 4 of the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, the drawings only show some but not all structures related to the present invention.

Example 1

FIG. 1 is a schematic flowchart of a method for drawing cube graphics according to Embodiment 1 of the present invention. The method is suitable for the case of performing cube rendering in an electronic whiteboard, and the method can be executed by a device for rendering cube graphics, wherein the device can be It is implemented in software and/or hardware, and can generally be integrated on electronic devices as a plug-in for an electronic whiteboard.

In this embodiment, the electronic device may specifically be a mobile terminal device such as a mobile phone, a tablet computer, and a notebook, or a stationary terminal device with interactive functions such as a desktop computer and an intelligent teaching whiteboard. The preferred application scenario of this embodiment is to perform cube drawing on the canvas of the drawing function module under the interactive function of the electronic whiteboard. At this time, based on the drawing method provided by the present invention, the painter can draw the length and width simply and quickly. High long cubes.

As shown in FIG. 1 , a method for drawing a cube graph provided by Embodiment 1 of the present invention includes the following operations:

S101. Acquire a first coordinate value of a first drawing point formed by a cursor drawing point in a canvas.

In this embodiment, the canvas may specifically refer to an operation interface displayed on the screen of the device when a drawing operation is performed in the electronic whiteboard. Generally, the user can perform touch-screen painting on the canvas with a finger or a touch-screen pen, and can also draw on the canvas by operating a mouse, wherein the cursor drawing point can be specifically understood as performing touch-screen or mouse operations. The draw ID to display in the canvas after the response.

Specifically, the user can click the mouse or click the screen in any area of the canvas. In this step, the cursor drawing point can be triggered to form the first drawing point in the canvas after responding to the above operation, and the screen coordinates of the first drawing point on the device can be obtained. It can be understood that in this embodiment, the coordinate system where the canvas is located by default takes the first drawing point as the origin, and its horizontal and vertical axes can pass the pixel coordinate value of the first drawing point. The above screen coordinate system is obtained by translation. Therefore, in this embodiment, the first coordinate value of the first drawing point in the coordinate system where the canvas is located can be regarded as (0,0).

S102. Monitor and acquire the current coordinate value corresponding to the cursor drawing point moving in the canvas.

It can be understood that during the drawing process, the movement of the cursor drawing point in the canvas can be triggered by the user dragging the mouse or touching and sliding on the screen, and this step can monitor the movement operation of the cursor drawing point in the canvas, The current pixel coordinate value corresponding to the cursor drawing point in the screen coordinate system can be obtained in real time. Therefore, according to the current pixel coordinate value and the pixel coordinate value of the first drawing point, the coordinate system where the cursor drawing point is located on the canvas can be determined in real time. The corresponding current coordinate value in .

S103: Determine the adsorption coordinate value of the adsorption point required for drawing the cube to be drawn according to the first coordinate value, the current coordinate value and the preset standard reference information.

In this embodiment, the first coordinate value may specifically refer to the coordinate value (generally denoted as (0,0)) of the first drawing point in the coordinate system where the canvas is located; the current coordinate value may specifically refer to The coordinate value currently in the coordinate system where the canvas is located when the cursor drawing point moves (usually can be determined according to the current pixel coordinate value of the cursor drawing point in the screen coordinate system and the pixel coordinate value of the first drawing point).

In addition, the standard reference information may specifically refer to preset reference information for determining the adsorption point during cube rendering. Specifically, the standard reference information may be determined according to the projected coordinate values after the standard cube model is projected onto the canvas, wherein the standard reference information may include an edge in the canvas serving as the top surface of the standard cube model and the position of the horizontal axis where the canvas is located. The included angle value of the included angle, the included angle value of the included angle formed by the two adjacent sides as the top surface of the standard cube, and the corresponding change matrix when the standard cube model is projected, etc., are used for the determination of the adsorption points required for subsequent drawing of the cube .

Generally, when drawing a cube, it is necessary to ensure that the long side, wide side and high side of the drawn cube have equal length values. When drawing on an existing electronic whiteboard, the user cannot directly determine the vertices that ensure equal length, width and height of the cube. Therefore, this embodiment provides a method for drawing a cube, so as to ensure that the long side, the wide side and the high side of the to-be-drawn cube have the same length by determining the adsorption point as the vertex of the to-be-drawn cube.

Exemplarily, the operation of determining the adsorption point can be described as: first, the first drawing point is used as the first vertex on the top surface of the cube to be drawn, and the moving cursor drawing point is used as the second vertex on the top surface of the cube to be drawn. , and the first vertex and the second vertex can be set as the opposite vertices constituting the top surface. At this time, it can be determined that the first vertex is a fixed point, and the second vertex is a moving point, and the current coordinate value corresponding to the movement of the second vertex is obtained. Then, the current coordinate values of the other two vertices that constitute the top surface of the cube to be drawn can be determined according to the first coordinate value of the first vertex, the current coordinate value of the second vertex, and the standard reference information; The current coordinate values of the three vertices obtain the current length values of the long side and the wide side of the cube to be drawn, and then it can be assumed that the current length values of the long side and the wide side are equal, so it can be determined that the second vertex when the long side and the wide side are equal The ideal coordinate value that should be there, this step is taken as the adsorption coordinate value, and the corresponding coordinate point is taken as the adsorption point, so that the second vertex can be adsorbed and fixed to the position corresponding to the adsorption point.

It can be understood that an adsorption point can be determined through the above operations. According to the determined adsorption point, only the long side and the wide side of the cube to be drawn can be guaranteed to be equal, and the high side cannot be guaranteed to be equal to the long side and the wide side. Therefore, it is necessary to determine the The next snap point required to draw the cube.

Exemplarily, the operation of determining the next adsorption point can be expressed as: after the second vertex is fixed to the position corresponding to the adsorption point, monitor the movement of the cursor drawing point again, and determine the current coordinate value in the canvas when moving; then The line connecting the second vertex and the cursor drawing point is regarded as the high side of the cube to be drawn, and the current length value of the high side is determined according to the adsorption coordinate value corresponding to the second vertex and the current coordinate value of the cursor drawing point, and then the high side can be assumed. The current length value of the side is equal to the length value of the above-mentioned long side or wide side, so the ideal coordinate value that the cursor drawing point should have when the high side is equal to the long side or wide side can be determined. In this step, the ideal coordinate value can be used as The adsorption coordinate value of the next adsorption point, and the cursor drawing point can be fixed to the position corresponding to the next adsorption point.

After the above operations, the adsorption coordinate values of at least two adsorption points required to draw the cube are finally determined. Subsequent operations in this embodiment use the above-determined adsorption point as the vertex of the cube to be drawn, thereby ensuring that the drawn cube has the same length, width and height.

S104. Determine the first drawing point and the adsorption point as the vertices of the cube to be drawn, and determine the coordinate values of the remaining vertices of the cube to be drawn according to the adsorption coordinate value and the first coordinate value and highlight them, so as to connect the vertices to form the cube to be drawn .

In this embodiment, firstly, the first drawing point and the determined adsorption point may be used as fixed vertices of the cube to be drawn, and then, according to the coordinate values of the determined first drawing point and the adsorption point, in combination with a preset The standard reference information of the to-be-drawn cube determines the coordinate value of each vertex in the cube to be drawn, and can be highlighted. Finally, each highlighted vertex is connected to form a cube of equal length, width and height in the canvas.

Embodiment 1 of the present invention provides a method for drawing a cube graph, which can be based on the acquired first coordinate value of the first drawing point, the current coordinate value of the monitored cursor drawing point, and the preset standard reference information for cube drawing. , determine the adsorption point required for drawing the cube on the canvas, and finally determine the coordinate value corresponding to each vertex in the cube according to the determined coordinate value of the adsorption point and the first coordinate value of the first drawing point, and realize the drawing of the cube on the canvas. By using the method, the drawing of the cube can be realized simply and conveniently on the canvas of the electronic whiteboard, thereby better enhancing the user experience of the drawing function in the electronic whiteboard.

Embodiment 2

FIG. 2a is a schematic flowchart of a method for drawing a cube graph according to Embodiment 2 of the present invention. The embodiment of the present invention performs optimization based on the above-mentioned embodiment. In this embodiment, the optimization adds: project the standard cube model into the canvas, and obtain the projection of each vertex in the standard cube model on the canvas Coordinate value; according to the projected coordinate value of each vertex in the canvas, determine the standard reference information of the standard cube model in the canvas.

As shown in FIG. 2a, a method for drawing a cube graph provided in Embodiment 2 of the present invention specifically includes the following operations:

It can be understood that this embodiment adds S201 and S202 on the basis of the above-mentioned embodiment, thereby realizing the determination of the standard reference information.

S201. Project the standard cube model onto the canvas, and obtain the projected coordinate values of each vertex in the standard cube model on the canvas.

In this embodiment, projection processing can be performed on the standard cube model first, and the projection information of the standard cube model on the canvas can be obtained, which is used to determine the adsorption point during subsequent cube drawing. It should be noted that the standard cube model used in this embodiment can be constructed by a construction function, and the constructed standard cube model has corresponding spatial coordinate information. In this step, the projection of the standard cube model to the two-dimensional canvas can be realized according to the spatial coordinate information of the standard cube model and the selected projection transformation matrix; the function set required for the projection in the function library of the operating system of the electronic device can also be directly called to realize the standard cube Projection of the model.

Further, in this embodiment, the standard cube model is projected into the canvas, and the projected coordinate values of each vertex in the standard cube model in the canvas are obtained, and the specific optimization is: calling in the constructed three-dimensional scene. The preset virtual perspective camera projects the set standard cube model in the canvas according to the virtual perspective camera; calls the set projection coordinate determination function, and according to the spatial coordinate value of each vertex of the standard cube model, Determine the projected coordinate value of each vertex in the canvas.

In this embodiment, the projection function set in the operating system function library is preferably used to realize the projection of the standard cube model to the canvas. The specific process of projecting the standard cube model to the canvas can be described as follows: first, the construction function of the three-dimensional scene is called to construct A three-dimensional scene; then add a preset virtual camera in the three-dimensional scene, wherein, the virtual camera is preferably a virtual perspective camera; then call the cube construction function to construct a standard cube model with an edge length of 1 in the three-dimensional scene, and finally pass The added virtual perspective camera projects the constructed standard cube model onto the two-dimensional plane, and can call the projection coordinate determination function to obtain the corresponding projected coordinate values of each vertex of the standard cube model on the two-dimensional plane according to the spatial coordinate information of the standard cube model.

S202. Determine the standard reference information of the standard cube model in the canvas according to the projected coordinate values of the vertices in the canvas.

In this embodiment, standard cubes that form a plane can be connected in the canvas according to the projected coordinate values of the vertices in the canvas. Further, the determination operation of the standard reference information described in this step can be realized through the operation steps shown in FIG. 2 b , wherein FIG. 2 b is a specific operation flowchart for determining the standard reference information in Embodiment 2 of the present invention, and at the same time, FIG. 2c is a schematic diagram of the projection of the standard cube model on the canvas when the standard reference information is determined. As shown in Figure 2b, the specific operation steps for determining the standard reference information include:

S2021: Denote the vertices representing the top surface of the standard cube model in the canvas as the first vertex SP1, the second vertex SP2, the third vertex SP3 and the fourth vertex SP4, and denote the bottom vertex opposite to the SP2 as the sixth vertex SP6.

Exemplarily, as shown in FIG. 2c, the canvas 20 is in the screen coordinate system XOY, and the points SP1, SP2, SP3 and SP4 in the canvas 20 constitute the top surface of the standard cube model, and the points SP1 and SP4 can be determined at the same time. SP2 is the opposite vertex in the top surface; in addition, according to Fig. 2c, in the canvas 20, the points SP5, SP6, SP7 and SP8 are respectively opposite to the points SP1, SP2, SP3 and SP4, and constitute a The base of the standard cube model.

S2022: Denote the side formed by SP1 and SP3 as the broad side SH1, the side formed by SP3 and SP2 as the long side SH2, and the side formed by SP2 and SP6 as the high side SH3.

Exemplarily, as shown in Figure 2c, the connection of points SP1 and SP3 forms the broad side SH1 of the standard cube model, the connection of points SP2 and SP3 forms the long side SH2 of the standard cube model, and at the same time, the point SP2 and the point The connection of SP6 forms the broad side SH3 of the standard cube model.

S2023, according to the projected coordinate values of SP1, SP2, SP3, SP4 and SP6, determine the length values of the SH1, SH2 and SH3, and determine the first angle value of the included angle formed by SH1 and SH2, and the SH2 and the canvas The second included angle value of the included angle formed by the abscissa axis.

Exemplarily, in order to facilitate the representation of standard reference information, as shown in FIG. 2c, this embodiment uses point SP1 as the origin to construct an xoy coordinate system parallel to the screen coordinate system XOY. It should be noted that each point in this embodiment The projected coordinate value of the xoy coordinate system, so this embodiment can determine the length values of SH1, SH2 and SH3 according to the projected coordinate value of each point, and can determine the vectors of the above sides in the xoy coordinate system. For example, the point can be determined The vector V1 of SP1 and point SP3, the vector V2 of point SP3 and point SP2, and the vector V3 of point SP1 and point SP4, the vector of point SP1 and point (1,0) in the xoy coordinate system is V4.

In addition, as shown in Figure 2c, it can be determined that the angle formed by SH1 and SH2 is β, and the angle formed by SH2 and the abscissa axis where the canvas 20 is located is equivalent to the angle formed by SH2 and the x axis in the xoy coordinate system. for ɑ. Specifically, in this embodiment, the first included angle value of the included angle β and the second included angle value of the included angle ɑ can be determined according to the vector product formula. Following the above example, the first included angle value of β can be determined to be β=arccos( V1·V2/|V1||V2|); and it can be determined that the second angle value of ɑ is ɑ=arccos(V4·V3/|V4||V3|).

S2024, taking the coordinate system where the canvas is currently located as the first coordinate system, and taking the coordinate system with SH2 as the abscissa axis as the second coordinate system.

Exemplarily, as shown in FIG. 2c, since the coordinate system where the canvas 20 is currently located is the xoy coordinate system, the xoy coordinate system can be recorded as the first coordinate system, and it can be seen that the horizontal axis in the x`oy` coordinate system is The coordinate axis is SH2, so the x`oy` coordinate system can be recorded as the second coordinate system.

S2025, according to the first included angle value and the second included angle value, determine the first transformation matrix Mo corresponding when the first coordinate system is transformed into the second coordinate system, and the first transformation matrix Mo corresponding when the second coordinate system is transformed into the first coordinate system Two transformation matrix Mo`.

记为第一变换矩阵；同时，x`oy`坐标系到xoy坐标系的变换，相当于x`oy`坐标系逆时针旋转了夹角ɑ变换为xoy，根据坐标变换规则以及变换夹角ɑ对应的第二夹角值，可确定其对应的变换矩阵Mo`可表示为：

记为第二变换矩阵。Exemplarily, as shown in Figure 2c, the transformation from the xoy coordinate system to the x`oy` coordinate system is equivalent to the clockwise rotation of the xoy coordinate system by the included angle ɑ and the transformation into the x`oy` coordinate system. In this embodiment, According to the coordinate transformation rules and the second angle value corresponding to the transformation angle ɑ, it can be determined that the corresponding transformation matrix Mo can be expressed as:

Recorded as the first transformation matrix; at the same time, the transformation from the x`oy` coordinate system to the xoy coordinate system is equivalent to the x`oy` coordinate system rotating the angle ɑ counterclockwise and transforming it into xoy, according to the coordinate transformation rules and the transformation angle ɑ The corresponding second included angle value, it can be determined that the corresponding transformation matrix Mo` can be expressed as:

Denoted as the second transformation matrix.

S2026. Use the first included angle value, Mo and Mo', and the length values of SH1, SH2, and SH3 as preset standard reference information.

In this embodiment, the first angle value of the angle β formed by SH1 and SH2, the first transformation matrix Mo, and the second transformation matrix Mo' can be regarded as standard reference information, and the broad side SH1 and the long side SH2 And high-side SH3 as standard reference information for subsequent operations.

S203: Acquire the first coordinate value of the first drawing point formed by the cursor drawing point in the canvas.

Exemplarily, a first drawing point can be formed in the canvas by triggering a cursor drawing point in response to a user clicking a mouse, and a first coordinate system in which the canvas is located can be constructed with the first drawing point as an origin, thus, The first coordinate value of the first drawing point can be regarded as (0,0). It can be understood that the first coordinate system can be determined by the screen coordinate system according to the pixels of the first drawing point in the screen coordinate system. The coordinate value is obtained by translation.

S204. Monitor and acquire the current coordinate value corresponding to the cursor drawing point when it moves in the canvas.

Exemplarily, the movement of the cursor drawing point in the canvas can be monitored, and the current pixel coordinate value corresponding to the cursor drawing point in the screen coordinate system can be obtained, so that it can be determined according to the current pixel coordinate value that the cursor drawing point is on the canvas. the current coordinate value in the first coordinate system.

S205 , according to the first coordinate value, the current coordinate value and the preset standard reference information, determine the adsorption coordinate value of the adsorption point required to draw the cube to be drawn.

In this embodiment, according to the first coordinate value of the first drawing point in the first coordinate system, the current coordinate value of the cursor drawing point, and the first included angle value, the third Standard reference information such as a transformation matrix and a second transformation matrix to determine the adsorption coordinate value of the adsorption point required for the cube to be drawn.

Further, the determination operation of the adsorption coordinate value in this step can be realized through the operation flow shown in FIG. 2d, wherein, FIG. 2d is the specific operation flow chart of determining the adsorption coordinate value in Embodiment 2 of the present invention, and at the same time, FIG. An effect display diagram when the first adsorption coordinate value is determined; FIG. 2f is an effect display diagram when the second adsorption coordinate value is determined. As shown in Figure 2d, the specific operation steps for determining the adsorption coordinate value include:

S2051 , taking the first drawing point and the cursor drawing point as two vertices of the top surface of the cube to be drawn, and denoted as P1 and P2 respectively, wherein the P1 and P2 are opposite vertices on the top surface.

Exemplarily, as shown in FIG. 2e, XOY is the screen coordinate system of the electronic device, and the canvas 20 is in the screen coordinate system, wherein, the first drawing point P1 formed by the triggering of the cursor drawing point can be regarded as the coordinate where the canvas 20 is located. It is the origin of xoy, and P1 can be regarded as a vertex in the top surface of the cube to be drawn, and its corresponding first coordinate value can be marked as (0,0), and the cursor drawing point moving in the canvas 20 can be used as the top of the cube to be drawn. Another vertex P2 of the face, its current coordinate value in the xoy coordinate system can be determined through S204. It should be known that, in this embodiment, the point P1 and the point P2 are set as opposite vertices on the top surface.

S2052, according to the first included angle value, Mo and Mo', the first coordinate value of P1 and the current coordinate value of P2, determine that the third vertex P3 and the fourth vertex P4 of the top surface in the cube to be drawn are in the first coordinate system the current coordinate value of .

In this step, the remaining vertices on the top surface of the cube to be drawn can be recorded as the third vertex P3 and the fourth vertex P4 respectively. In this embodiment, when drawing the cube to be drawn, in order to ensure that the drawn figure is a cube, it is first necessary to set the The angle between the edge length H _P1P4 formed by the point P1 and the point P4 and the x-axis is ɑ by default, that is, to ensure that the angle formed by the H _P1P4 and the x-axis is the second angle value; The angle between the first edge length H _P1P3 formed by point P1 and point P3 and the second edge length H _P2P3 formed by point P3 and point P2 is β by default, that is, the angle that ensures the angle formed by H _P1P3 and H _P2P3 The value is the value of the first included angle.

In this step, according to the coordinate values of P1 and P2 in the xoy coordinate system and the first included angle value, Mo and Mo' recorded in the standard reference information, the current coordinate values ( Points P3 and P4 are only the calculated current coordinate values, so the connections between the points in Figure 2e are indicated by dotted lines). Specifically, according to the first transformation matrix Mo, the coordinate values of the point P1 and the point P2 on the second coordinate system x`oy` can be determined, wherein, P1`=P1*Mo; P2`=P2*Mo; ` and point P4` are respectively recorded as the corresponding points of point P3 and point P4 in the second coordinate system, then the coordinate values of point P3` and point P4` in x`oy` can be calculated by the following formula:

P3` = [P1`.x – (P2`.y – P1`.y)*cotβ, P2`.y] (1)

P4`=[P1`.x+(P2`.x–P3`.x), P1`.y] (2)

Afterwards, according to the second transformation matrix Mo`, P3=P3`*Mo` and P4=P4`*Mo` can be determined, and then the corresponding points P3 and P4` after the point P3` and point P4` are converted into the xoy coordinate system can be determined. The current coordinate value of point P4 (the current positions of points P3 and P4 are shown in FIG. 2e).

S2053: Determine the current edge length values of the first edge length H _P1P3 and the second edge length H _P2P3 according to the first coordinate value of P1 and the current coordinate values of P2, P3 and P4, and according to the current edge lengths of H _P1P3 and H _P2P3 The length value and the length values of SH1 and SH2 determine the first ratio value R1 corresponding to _HP1P3 and the second ratio value R2 corresponding to _HP2P3 .

In this embodiment, the length of the first edge H _P1P3 is equivalent to the wide side of the cube to be drawn, and the length of the second edge H _P2P3 is equivalent to the long side of the cube to be drawn. In order to ensure that the length, width and height of the cube to be drawn are equal , first of all, it is necessary to ensure that _HP1P3 (wide side) and _HP2P3 (long side) are equal.

Therefore, the present embodiment can determine the current edge length values of the first edge length H _P1P3 and the second edge length H _P2P3 according to the first coordinate value of the point P1 and the current coordinate values of the point P2, the point P3 and the point P4; According to the current edge length values of _HP1P3 and _HP2P3 and the length values of SH1 and SH2 in the standard reference information, the first ratio value R1 and the corresponding first ratio value R1 corresponding to _HP1P3 are determined by formula R1= _HP1P3 /SH1; R2= _HP2P3 /SH2 The second ratio value R2 corresponding to _HP2P3 is described, so as to ensure that _HP1P3 (broad side) and _HP2P3 (long side) are equal according to the subsequent determination of adsorption coordinate values through the ratio values corresponding to each side.

S2054, when the difference between R1 and R2 is not greater than the set threshold, according to R1 and R2 and the first included angle value, Mo and Mo', determine that the first adsorption point required to draw the cube to be drawn is at the first coordinate The first adsorption coordinate value in the system.

In this embodiment, in order to ensure that H _P1P3 (wide side) and H _P2P3 (long side) are equal in the cube to be drawn, the values of R1 and R2 can be compared, and it is determined whether the difference is not greater than the set threshold, The set threshold may be set by default by the system, or may be set manually according to historical experience. In this embodiment, the set threshold is preferably set to 0.05.

It should be noted that when the difference between R1 and R2 is greater than the set threshold, this embodiment does not perform the following determination of the adsorption coordinate value, but returns to S204 to continue to obtain the current coordinate value corresponding to the cursor drawing point after moving. (This embodiment is not shown in Fig. 2a), and re-executes S205 according to the new current coordinate value of the cursor drawing point (not shown in Fig. 2a), and the above operations can be repeated until the difference between R1 and R2 is determined in this step Less than or equal to the set threshold.

Specifically, when the difference between R1 and R2 is not greater than the set threshold, the process of determining the first adsorption coordinate value of the first adsorption point in the first coordinate system can be described as: Step (1), select R1 or R2 as the The standard ratio value R, this step takes R1 as the standard ratio value R as an example, so it can be determined that R=R1=H _P1P3 /SH1, since R is the standard ratio value, it can be considered that the current H _P1P3 is the standard value, and then it is necessary to ensure that R2 equal to R, to ensure that the wide side (H _P1P3 ) of the cube to be drawn is equal to the long side (H _P2P3 ), at this time, the standard value of H _P2P3 can be determined by the reverse formula H _P2P3 = (H _P1P3 /SH1)*SH2 Step (2), after determining the standard value of _HP2P3 , can according to the standard value of _HP2P3 , the first coordinate value of point P1 and the first included angle value, Mo and Mo', determine the point P2 to be adsorbed The first adsorption coordinate value corresponding to the first adsorption point (for convenience of representation, the to-be-determined first adsorption point is directly recorded as P21).

Specifically, the process of the above step (2) can be described as: determining the quadrant area corresponding to when the cursor moving point P2 moves in the first coordinate system xoy where the canvas 20 is located. It should be noted that in this embodiment, the first adsorption point P21 It is regarded as the point to be adsorbed by the cursor drawing point P2, and when the point P2 is in different quadrants, the first adsorption coordinate value corresponding to the first adsorption point P21 to be adsorbed by the point P2 can be determined according to different coordinate calculation formulas, wherein, the coordinate calculation formula include:

In the first quadrant:

P21`=[P1`.x+H _P2P3 *cotβ+H1,P1`.y–H _P2P3 *sinβ]

In the second quadrant:

P21`=[P1`.x+H _P2P3 *cotβ–H1,P1`.y–H _P2P3 *sinβ]

In the third quadrant:

P21`=[P1`.x–H _P2P3 *cotβ–H1,P1`.y+H _P2P3 *sinβ]

In the fourth quadrant:

P21`=[P1`.x–H _P2P3 *cotβ+H1,P1`.y+H _P2P3 *sinβ]

It should be noted that, in the above formula, P1`=P1*Mo, the <sub>HP2P3</sub> is the standard value calculated according to the standard ratio value, the point P21` is equivalent to the first adsorption point P21 in the second coordinate system x`oy` , wherein the first adsorption coordinate value of the first adsorption point P21 in the first coordinate system xoy can be determined according to P21=P21`*Mo`.

At the same time, it can be seen that the quadrant area when the point P2 shown in FIG. 2e moves in the first coordinate system xoy where the canvas 20 is located is the fourth quadrant, so the first quadrant of P21 can be determined according to the calculation formula corresponding to the fourth quadrant Adsorption coordinate value (Fig. 2e shows the position of point P21).

S2055. Adsorb P2 to the position of the first adsorption point, determine that the current coordinate value of P2 is the first adsorption coordinate value, and after P2 is adsorbed to the first adsorption point, mark the cursor drawing point as P6, monitor and acquire The current coordinate value of P6 when moving in the canvas.

Exemplarily, after the first adsorption coordinate of the first adsorption point is determined according to S2054, in this step, the point P2 can be adsorbed to the position of the first adsorption point P21, and the current coordinate value of the point P2 can be determined as the first adsorption coordinate. value. As shown in Figure 2f, the point P2 is adsorbed to the position of the first adsorption point P21, and the point P2 and the point P21 are the same point. Figure 2f also shows that after the point P2 is adsorbed to the point P21, the four points in the top surface of the cube to be drawn The connection relationship between the vertices (specifically shown with thick dashed lines).

After that, this step also marks the cursor drawing point as P6, and the cursor drawing point P6 responds to the user's operation and moves with a trajectory perpendicular to the vertical axis y of the canvas 20. In this step, the movement of the cursor drawing point can be monitored, and the cursor drawing point can be obtained. The current pixel coordinate value of P6 is finally obtained according to the current pixel coordinate value in the first coordinate system xoy. Figure 2f shows the current position of point P6 in the xoy coordinate system.

S2056: Determine the current edge length value of the third edge length H _P2P6 according to the first adsorption coordinate value of the P2 and the current coordinate value of the P6, and according to the current edge length value of the H _P2P6 and the SH3 The length value determines the third ratio value R3 of the _HP2P6 .

Exemplarily, as shown in Figure 2f, the point P2 (P21) is connected with the point P6 to form a third edge length H _P2P6 , wherein the third edge length H _P2P6 is equivalent to the high side of the cube to be drawn, and this step can be based on The first adsorption coordinate value of point P2 (P21) and the current coordinate value of point P6 determine the current edge length value of H _P2P6 .

In this embodiment, according to the current edge length value of _HP2P6 and the length value of SH3 in the standard reference information, the first ratio value R3 corresponding to _HP2P6 can be determined by the following formula: R3= _HP2P6 /SH3.

S2057. When the difference between R3 and R1 and/or R2 is not greater than the set threshold, according to R1 and/or R2, the first adsorption coordinate value and R3, determine that the second adsorption point required to draw the cube to be drawn is at The second snap coordinate value in the first coordinate system.

In this embodiment, the set threshold is also preferably 0.05; according to the above S2054, it can be ensured that the wide side (H _P1P3 ) and the long side (H _P2P3 ) of the cube to be drawn are equal by ensuring that R1 and R2 are equal. This step requires It is further determined that the high side (H _P2P6 ) of the cube to be drawn is equal to the wide side (H _P1P3 ) and the long side (H _P2P3 ) at the same time, so the second adsorption point in the to-be-drawn cube needs to be determined.

Specifically, the process of determining the second adsorption coordinate value of the second adsorption point in the first coordinate system can be described as: step (1), selecting R1 and/or R2 as the standard ratio value R, in this embodiment, R1 is used as the The standard ratio value R is taken as an example, so it can be determined that R=R1=H _P1P3 /SH1. Since R is the standard ratio value, the current H _P1P3 can also be considered as the standard value _. The high sides (H _P2P6 ) are equal, and it is necessary to ensure that R3 is equal to R. At this time, the standard value of H _P2P6 can be obtained through the inverse formula H _P2P6 = (H _P1P3 /SH1)*SH3; step (2), after determining the H _P2P6 After the standard value, according to the standard value of _HP2P6 , the first adsorption coordinate value of point P2 and the formula P61=[ _P2 . Two adsorption coordinate values (for convenience of representation, the first adsorption point to be determined is directly denoted as P61, and FIG. 2f shows the location of point P61), wherein the _HP2P6 is the standard value calculated according to the standard ratio value .

S206. Determine the first drawing point and the adsorption point as the vertices of the cube to be drawn, and determine the coordinate values of the remaining vertices of the cube to be drawn according to the adsorption coordinate value and the first coordinate value and highlight them, so as to connect the vertices to form the to-be-drawn cube. Draw the cube.

In this embodiment, the determined first drawing point, the first adsorption point, and the second adsorption point may be determined as the fixed vertices of the cube to be drawn, and then the coordinate values of the fixed vertices and the preset standard reference information may be determined. , determine the coordinate values of the remaining vertices in the cube to be drawn in the coordinate system xoy where the canvas is located.

Specifically, in this step, the coordinate values of the remaining vertices of the cube to be drawn are determined by the following operations: the P6 is adsorbed to the position of the second adsorption point, and the current coordinate value of the P6 is determined to be the second adsorption point. Coordinate value; according to the first coordinate value of P1, the first adsorption coordinate value of P2, the second adsorption coordinate value of P6, and the first included angle value, Mo and Mo', determine the rest of the cube to be drawn. The coordinate values of the vertices are highlighted, so as to connect the vertices on the canvas to form the to-be-drawn cube.

It can be understood that, after the second adsorption coordinate value of the second adsorption point P61 is determined, the point P6 can also be adsorbed to the position of the second adsorption point P61 in this step, and the current coordinate value of the point P6 can be determined as the first adsorption point. Two adsorption coordinate values. FIG. 2g is an example diagram of a cube to be drawn determined according to the adsorption coordinate values of the adsorption points. As shown in FIG. 2g, the point P6 is adsorbed to the position of the second adsorption point P61, which is marked as P6 (P61).

In this embodiment, according to the first coordinate value of the first drawing point P1 and the first adsorption coordinate value of the first adsorption point P2 (P21), formula (1) and formula (2) in this embodiment can be used again. Determine the coordinate values of point P3` and point P4` under the second coordinate system x`oy`, and then determine the first coordinate system xoy according to the second transformation matrix Mo` and the coordinate values of point P3` and point P4` Coordinate values of point P3 and point P4 and can be highlighted.

Further, in this implementation, the vertices on the top surface of the cube to be drawn are P1, P2, P3 and P4, and the points P5, P6, P7 and P8 are respectively the vertices corresponding to the above-mentioned points on the bottom surface of the cube to be drawn. Therefore, In this embodiment, according to the determined coordinate values of point P3 and point P4, and the standard value of H _P2P6 , the coordinate values of point P5, point P7 and point P8 can be respectively determined and highlighted according to the following formula:

P5=[P1.X,P2.Y+H3]

P7=[P3.X, P3.Y+H3]

P8=[P4.X, P4.Y+H3]

In this embodiment, the above determined and highlighted vertices can be connected to form the required cube to be drawn (as shown in FIG. 2g ). It can be determined that the drawn cube to be drawn The long side, wide side, and high side are equal.

The second embodiment of the present invention provides a method for drawing a cube figure, which specifically adds the operation of determining the standard reference information, and at the same time specifies the operation of determining the adsorption point required for the cube to be drawn, and finally obtains the desired adsorption point according to the determined adsorption point. Draw the coordinate values of the vertices of the cube, and connect them to form the cube to be drawn. By using the method, the drawing of the cube can be realized simply and conveniently on the canvas of the electronic whiteboard, thereby better enhancing the user experience of the drawing function in the electronic whiteboard.

Embodiment 3

FIG. 3 is a structural block diagram of an apparatus for drawing a cube graph according to Embodiment 3 of the present invention. The method is suitable for the case of cube rendering in an electronic whiteboard, wherein the device can be implemented by software and/or hardware, and can generally be integrated on electronic equipment as a plug-in of the electronic whiteboard. As shown in FIG. 3 , the device includes: a first coordinate obtaining module 31 , a moving coordinate obtaining module 32 , an adsorption coordinate obtaining module 33 and a graphics drawing module 34 .

Wherein, the first coordinate obtaining module 31 is used to obtain the first coordinate value of the first drawing point formed by the cursor drawing point in the canvas;

The movement coordinate acquisition module 32 is used to monitor and acquire the current coordinate value corresponding to the movement of the cursor drawing point in the canvas;

The adsorption coordinate acquisition module 33 is configured to determine the adsorption coordinate value of the adsorption point required for drawing the cube to be drawn according to the first coordinate value, the current coordinate value and the preset standard reference information;

The graphics drawing module 34 is configured to determine that the first drawing point and the adsorption point are the vertices of the cube to be drawn, and determine the coordinates of the remaining vertices of the cube to be drawn according to the adsorption coordinate value and the first coordinate value value and highlight it to connect the vertices to form the cube to draw.

In this embodiment, the device first obtains the first coordinate value of the first drawing point formed by the cursor drawing point in the canvas through the first coordinate obtaining module 31; The current coordinate value corresponding to the movement in the canvas; after that, the adsorption coordinate acquisition module 33 determines the adsorption of the adsorption point required to draw the cube to be drawn according to the first coordinate value, the current coordinate value and the preset standard reference information. coordinate value; finally, the first drawing point and the adsorption point are determined by the graphics drawing module 34 as the vertices of the cube to be drawn, and according to the adsorption coordinate value and the first coordinate value, the remaining vertices of the cube to be drawn are determined The coordinate value of , and highlight it to connect the vertices to form the cube to be drawn.

The third embodiment of the present invention provides a device for drawing cube graphics, which can draw the first coordinate value of the first drawing point, the current coordinate value of the monitored cursor drawing point, and the preset standard reference information for cube drawing according to the acquired first coordinate value of the first drawing point. , determine the adsorption point required for drawing the cube on the canvas, and finally determine the coordinate value corresponding to each vertex in the cube according to the determined coordinate value of the adsorption point and the first coordinate value of the first drawing point, and realize the drawing of the cube on the canvas. By using the device, the drawing of the cube can be realized simply and conveniently on the canvas of the electronic whiteboard, thereby better enhancing the user experience of the drawing function in the electronic whiteboard.

Further, the device is also optimized to include:

The projection coordinate acquisition module 35 is used to project the standard cube model into the canvas, and obtain the projected coordinate value of each vertex in the standard cube model in the canvas;

The reference information determination module 36 is configured to determine the standard reference information of the standard cube model in the canvas according to the projected coordinate values of each vertex in the canvas.

On the basis of the above optimization, the projection coordinate acquisition module 35 is specifically used for:

Calling a preset virtual perspective camera in the constructed three-dimensional scene, and projecting the set standard cube model in the canvas according to the virtual perspective camera;

The set projection coordinate determination function is called, and the projection coordinate value of each vertex in the canvas is determined according to the spatial coordinate value of each vertex of the standard cube model.

Further, the reference information determination module 36 is specifically used for:

The vertices representing the top surface of the standard cube model in the canvas are denoted as the first vertex SP1, the second vertex SP2, the third vertex SP3 and the fourth vertex SP4, and the bottom surface vertex opposite to the SP2 is denoted as the first vertex SP1, the second vertex SP2, the third vertex SP3 and the fourth vertex SP4. Six vertices SP6; the side formed by the SP1 and SP3 is marked as the broad side SH1, the side formed by the SP3 and SP2 is the long side SH2, and the side formed by the SP2 and SP6 is marked as the high side SH3; according to The projected coordinate values of the SP1, SP2, SP3, SP4 and SP6, determine the length values of the SH1, SH2 and SH3, and determine the first included angle value of the included angle formed by the SH1 and SH2 and the SH2 and SH2. The second included angle value of the included angle formed by the abscissa axis where the canvas is located; the coordinate system where the canvas is currently located is the first coordinate system, and the coordinate system with the SH2 as the abscissa axis is regarded as the second coordinate system; according to the first included angle value and the second included angle value, determine the corresponding first transformation matrix Mo when the first coordinate system is transformed into the second coordinate system, and the second coordinate system is transformed into The second transformation matrix Mo' corresponding to the first coordinate system; the first included angle value, Mo and Mo', and the length values of the SH1, SH2, and SH3 are used as preset standard reference information.

On the basis of the above optimization, the adsorption coordinate acquisition module 33 is specifically used for:

Take the first vertex and the cursor drawing point as the two vertices of the top surface of the cube to be drawn, which are respectively denoted as P1 and P2, wherein the P1 and P2 are opposite vertices in the top surface ; According to the first included angle value, Mo and Mo' and the current coordinate value of the first coordinate value of P1 and P2, it is determined that the 3rd vertex P3 and the 4th vertex P4 of the top surface in the cube to be drawn are at The current coordinate value in the first coordinate system; according to the first coordinate value of the P1 and the current coordinate values of the P2, P3 and P4, determine the current length of the first edge length H _P1P3 and the second edge length H _P2P3 edge length value, and according to the current edge length value of the _HP1P3 and _HP2P3 and the length values of SH1 and SH2, determine the first ratio value R1 corresponding to the _HP1P3 and the second ratio value R2 corresponding to the _HP2P3 ; When the difference between described R1 and described R2 is not greater than the set threshold value, according to described R1 and R2 and described first included angle value, Mo and Mo ', determine to draw the required first cube to be drawn a first adsorption coordinate value of the adsorption point in the first coordinate system; the P2 is adsorbed to the position of the first adsorption point, and the current coordinate value of the P2 is determined to be the first adsorption coordinate value , and after the P2 is adsorbed to the first adsorption point, mark the cursor drawing point as P6, monitor and obtain the current coordinate value of the P6 when it moves in the canvas; according to the first adsorption coordinate value of the P2 And the current coordinate value of described P6, determine the current edge length value of 3rd edge length H _P2P6 , and according to the current edge length value of described H _P2P6 and the length value of described SH3, determine the 3rd ratio of described H _P2P6 value R3; when the difference between the R3 and the R1 and/or R2 is not greater than the set threshold, determine the drawing according to the R1 and/or R2, the first adsorption coordinate value and the R3 The second adsorption coordinate value of the second adsorption point required by the cube to be drawn in the first coordinate system.

Further, the graphics drawing module 34 is specifically used for:

Adsorb the P6 to the position of the second adsorption point, and determine that the current coordinate value of the P6 is the second adsorption coordinate value; according to the first coordinate value of the P1 and the first adsorption coordinate value of the P2 and the second adsorption coordinate value of P6 and the first included angle value, Mo and Mo', determine the coordinate values of the remaining vertices of the cube to be drawn and highlight them, so as to connect the vertices on the canvas to form the The cube to be drawn.

Embodiment 4

FIG. 4 is a schematic diagram of the hardware structure of an electronic device provided by Embodiment 4 of the present invention. As shown in FIG. 4 , the electronic device provided by Embodiment 4 of the present invention includes:

processor 41 and storage device 42 . The number of processors in the electronic device may be one or more. In FIG. 4 , a processor 41 is used as an example. The processor 41 and the storage device 42 in the electronic device are also connected through a bus or other means. Connecting via a bus is an example.

It can be understood that, the electronic device of this embodiment can integrate the interactive function of the electronic whiteboard, so that the user can draw.

As a computer-readable storage medium, the storage device 42 in the electronic device can be used to store one or more programs, and the programs can be software programs, computer-executable programs, and modules, such as the cube graphics in the embodiment of the present invention. The program instruction/module corresponding to the drawing method (for example, the module in the drawing device of the cube graphic shown in FIG. 3 includes: a first coordinate acquisition module 31, a movement coordinate acquisition module 32, an adsorption coordinate acquisition module 33, and a graphics drawing module. 34). The processor 41 executes various functional applications and data processing of the electronic device by running the software programs, instructions and modules stored in the storage device 42 , that is, implements the method for drawing cube graphics in the above method embodiments.

The storage device 42 may include a stored program area and a stored data area, wherein the stored program area may store an operating system, an application program required for at least one function; the stored data area may store data created according to the use of the device, etc. example default standard reference information). Additionally, storage device 42 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, storage device 42 may further include memory located remotely from processor 41, which remote memory may be connected to the device through a network. Examples of such networks include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

Moreover, when one or more programs included in the above electronic device are executed by the one or more processors 41, the programs perform the following operations:

Obtain the first coordinate value of the first drawing point formed by the cursor drawing point in the canvas; monitor and obtain the current coordinate value corresponding to the cursor drawing point when moving in the canvas; according to the first coordinate value, the current coordinate value and Preset standard reference information, determine the adsorption coordinate value of the adsorption point required to draw the cube to be drawn; determine that the first drawing point and the adsorption point are the vertices of the cube to be drawn, and according to the adsorption coordinate value and For the first coordinate value, the coordinate values of the remaining vertices of the cube to be drawn are determined and highlighted, so as to connect the vertices to form the cube to be drawn.

In addition, an embodiment of the present invention also provides a computer-readable storage medium on which a computer program is stored, and when the program is executed by a control device, implements the method for drawing a cube graphic provided in Embodiment 1 or Embodiment 2 of the present invention, and the method The method includes: acquiring the first coordinate value of the first drawing point formed by the cursor drawing point in the canvas; monitoring and acquiring the current coordinate value corresponding to the cursor drawing point moving in the canvas; according to the first coordinate value, the current coordinate value and preset standard reference information, determine the adsorption coordinate value of the adsorption point required to draw the cube to be drawn; determine that the first drawing point and the adsorption point are the vertices of the cube to be drawn, and according to the adsorption coordinate value and the first coordinate value, the coordinate values of the remaining vertices of the cube to be drawn are determined and highlighted, so as to connect the vertices to form the cube to be drawn.

From the above description of the embodiments, those skilled in the art can clearly understand that the present invention can be realized by software and necessary general-purpose hardware, and of course can also be realized by hardware, but in many cases the former is a better embodiment . Based on such understanding, the technical solutions of the present invention can be embodied in the form of software products in essence or the parts that make contributions to the prior art, and the computer software products can be stored in a computer-readable storage medium, such as a floppy disk of a computer , read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), flash memory (FLASH), hard disk or CD, etc., including several instructions to make a computer device (which can be a personal computer, A server, or a network device, etc.) executes the methods described in the various embodiments of the present invention.

Note that the above are only preferred embodiments of the present invention and applied technical principles. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and can also include more other equivalent embodiments without departing from the concept of the present invention. The scope is determined by the scope of the appended claims.

Claims (10)

1. the drawing method of a cube figure, is characterized in that, comprises: Obtain the first coordinate value of the first drawing point formed by the cursor drawing point in the canvas; Monitor and obtain the current coordinate value corresponding to the movement of the cursor drawing point in the canvas; According to the first coordinate value, the current coordinate value and the preset standard reference information, the adsorption coordinate values of the two adsorption points required for the cube to be drawn are determined, wherein the standard reference information includes the length of the standard cube model in the canvas side, wide side and high side, the first included angle value of the included angle formed by the adjacent two sides as the top surface of the standard cube model in the canvas, and the transformation matrix required for the transformation between the coordinate system where the canvas is located and the specified coordinate system, The specified coordinate system is a coordinate system with the long side on the top surface of the standard cube model in the canvas as the abscissa axis; Determine the first drawing point and the two adsorption points as the vertices of the cube to be drawn, and determine the coordinate values of the remaining vertices of the cube to be drawn according to each of the adsorption coordinate values and the first coordinate value and highlight them , to connect the vertices to form the cube to be drawn, wherein the two adsorption points include: the two adsorption points include: a first adsorption point and a second adsorption point, the first adsorption point and the first drawing point The point is the opposite vertex of the top surface of the cube to be drawn, and the line connecting the first adsorption point and the second adsorption point is the height of the cube to be drawn. 2. The method of claim 1, further comprising: Projecting the standard cube model into the canvas, and obtaining the projected coordinate values of each vertex in the standard cube model in the canvas; According to the projected coordinate value of each vertex in the canvas, the standard reference information of the standard cube model in the canvas is determined. 3. The method according to claim 2, wherein the projecting a standard cube model into the canvas, and obtaining the projected coordinate values of each vertex in the standard cube model in the canvas, comprises: Calling a preset virtual perspective camera in the constructed three-dimensional scene, and projecting the set standard cube model in the canvas according to the virtual perspective camera; The set projection coordinate determination function is called, and the projection coordinate value of each vertex in the canvas is determined according to the spatial coordinate value of each vertex of the standard cube model. 4. The method according to claim 2, wherein, determining the standard reference information of the standard cube model in the canvas according to the projected coordinate value of each vertex in the canvas, comprising: The vertices representing the top surface of the standard cube model in the canvas are denoted as the first vertex SP1, the second vertex SP2, the third vertex SP3 and the fourth vertex SP4, and the bottom surface vertex opposite to the SP2 is denoted as the first vertex SP1, the second vertex SP2, the third vertex SP3 and the fourth vertex SP4. six vertex SP6; The side formed by the SP1 and SP3 is marked as the broad side SH1, the side formed by the SP3 and SP2 is the long side SH2, and the side formed by the SP2 and SP6 is marked as the high side SH3; According to the projected coordinate values of the SP1, SP2, SP3, SP4 and SP6, determine the length values of the SH1, SH2 and SH3, and determine the first included angle value of the included angle formed by the SH1 and SH2 and the SH2 The value of the second angle formed by the abscissa axis where the canvas is located; Taking the coordinate system where the canvas is currently located as the first coordinate system, and taking the SH2 as the coordinate system of the abscissa axis as the second coordinate system; According to the first included angle value and the second included angle value, a first transformation matrix Mo corresponding to the transformation of the first coordinate system into the second coordinate system is determined, and the second coordinate system is transformed into the The corresponding second transformation matrix Mo` in the first coordinate system; The first included angle value, Mo and Mo', and the length values of SH1, SH2, and SH3 are used as preset standard reference information. 5 . The method according to claim 4 , wherein the adsorption coordinate values of the two adsorption points required for the cube to be drawn are determined according to the first coordinate value, the current coordinate value and the preset standard reference information. 6 . ,include: Taking the first drawing point and the cursor drawing point as the two vertices of the top surface of the cube to be drawn, denoted as P1 and P2 respectively, wherein the P1 and P2 are opposite to each other in the top surface vertex; According to the first included angle value, Mo and Mo', the first coordinate value of P1 and the current coordinate value of P2, it is determined that the third vertex P3 and the fourth vertex P4 of the top surface of the cube to be drawn are where Describe the current coordinate value in the first coordinate system; According to the first coordinate value of P1 and the current coordinate values of P2, P3 and P4, determine the current edge length values of the first edge length H _P1P3 and the second edge length H _P2P3 , and according to the H _P1P3 and H The current edge length value of _P2P3 and the length values of SH1 and SH2, determine the first ratio value R1 corresponding to the _HP1P3 and the second ratio value R2 corresponding to the _HP2P3 ; When the difference between the R1 and the R2 is not greater than the set threshold, according to the R1 and R2 and the first included angle value, Mo and Mo', determine the first required to draw the cube to be drawn. the first adsorption coordinate value of the adsorption point in the first coordinate system; Adsorb the P2 to the position of the first adsorption point, determine that the current coordinate value of the P2 is the first adsorption coordinate value, and after the P2 is adsorbed to the first adsorption point, mark the cursor The drawing point is P6, monitor and obtain the current coordinate value of the P6 when it moves in the canvas; According to the first adsorption coordinate value of the P2 and the current coordinate value of the P6, the current edge length value of the third edge length _HP2P6 is determined, and according to the current edge length value of the _HP2P6 and the length value of the SH3 , determine the third ratio value R3 of the _HP2P6 ; When the difference between the R3 and the R1 and/or R2 is not greater than the set threshold, according to the R1 and/or R2, the first adsorption coordinate value and the R3, it is determined to draw the to-be-drawn The second snap coordinate value in the first coordinate system of the second snap point required to draw the cube. 6 . The method according to claim 5 , wherein the coordinate values of the vertices of the cube to be drawn are determined and highlighted according to the adsorption coordinate values and the first coordinate values, so as to connect the vertices to form The cube to be drawn includes: Adsorbing the P6 to the position of the second adsorption point, and determining that the current coordinate value of the P6 is the second adsorption coordinate value; Determine the coordinates of the remaining vertices of the cube to be drawn according to the first coordinate value of P1, the first adsorption coordinate value of P2, the second adsorption coordinate value of P6, and the first included angle value, Mo and Mo' value and highlight it to connect the vertices on the canvas to form the cube to be drawn. 7. A drawing device of a cube figure, characterized in that, comprising: a first coordinate obtaining module, used for obtaining the first coordinate value of the first drawing point formed by the cursor drawing point in the canvas; a moving coordinate obtaining module, used to monitor and obtain the current coordinate value corresponding to the cursor drawing point when moving in the canvas; The adsorption coordinate acquisition module is used to determine the adsorption coordinate values of the two adsorption points required for the cube to be drawn according to the first coordinate value, the current coordinate value and the preset standard reference information, wherein the standard reference information includes the standard reference information. The long side, wide side, and high side of the cube model in the canvas, the first angle value formed by the adjacent two sides of the top surface of the standard cube model in the canvas, and the coordinate system where the canvas is located and the specified coordinate system The transformation matrix required for conversion, the specified coordinate system is a coordinate system with the long side on the top surface of the standard cube model in the canvas as the abscissa axis; A graphics drawing module, configured to determine that the first drawing point and the two adsorption points are the vertices of the cube to be drawn, and determine the remaining vertices of the cube to be drawn according to each of the adsorption coordinate values and the first coordinate value and highlight the coordinate values of , to connect the vertices to form the cube to be drawn, wherein the two adsorption points include: the two adsorption points include: a first adsorption point and a second adsorption point, the first adsorption point The connection line with the first drawing point is the diagonal line of the top surface of the cube to be drawn, and the connection line between the first adsorption point and the second adsorption point is the height of the cube to be drawn. 8. The apparatus of claim 7, further comprising: a projection coordinate acquisition module, configured to project the standard cube model into the canvas, and obtain the projected coordinate values of each vertex in the standard cube model in the canvas; The reference information determination module is configured to determine the standard reference information of the standard cube model in the canvas according to the projected coordinate values of each vertex in the canvas. 9. An electronic device, characterized in that, comprising: one or more processors; a storage device for storing one or more programs; The one or more programs are executed by the one or more processors, so that the one or more processors implement the method for drawing cube graphics according to any one of claims 1-6. 10. A computer-readable storage medium on which a computer program is stored, characterized in that, when the program is executed by a processor, the method for drawing a cube graphic according to any one of claims 1-6 is implemented.

Images