JP5852876B2 - Display system and display program - Google Patents

Description

  The present invention relates to a display system and a display program.

  In recent years, a display system such as an electronic blackboard that includes a display device for displaying an image and draws figures such as dots and lines on the display screen according to the touch operation by performing a touch operation on the display screen. Is spreading.

  When you want to erase an incorrect figure drawn on a display system such as an electronic blackboard, generally select the eraser icon in the toolbar displayed on the display screen, and then touch the entire figure like when using the eraser. It is necessary to perform an operation. However, if the figure to be erased is large, it is difficult to trace the whole figure.

  As an apparatus for solving such a problem, Patent Documents 1 and 2 recognize a figure as a figure to be erased by performing a touch operation surrounding the figure to be erased, and perform a specific operation in the recognized state. Thus, an apparatus capable of erasing a graphic to be erased is described.

JP-A-8-221199 Japanese Patent Laid-Open No. 7-160827

  In the devices described in Patent Documents 1 and 2, when in a mode in which the figure is erased by performing a touch operation surrounding the figure as described above, a figure such as “◎” or “A” is drawn by the touch operation. There is a problem that cannot be done.

  For example, in the case of ◎, it is common to draw a large circle after drawing a small circle. However, when touch operations are performed in this order, the small circle is recognized as a figure to be erased and a large circle is drawn. A circle is recognized as a line defining the erasure range, and a large circle is not drawn. In addition, in the case of “A”, a part of the line of the second stroke is surrounded by the line of the third stroke. In addition to being recognized as a graphic, the line in the third stroke is recognized as a line that defines the erase range, and the line in the third stroke is not drawn.

  SUMMARY An advantage of some aspects of the invention is that it provides a user-friendly display system and display program for drawing and erasing a figure on a display screen.

The present invention includes a display unit having a display screen;
When a touch operation is performed on the display screen, a touch panel unit that acquires position information regarding the display screen of the touch operation;
A control unit for controlling the display unit,
A figure drawing unit for drawing a figure on the display screen according to the position information;
A closed region determination unit that determines whether or not the graphic drawn on the display screen is a graphic that defines a closed region;
When another figure has already been drawn in the closed region, an erasure object recognition unit that recognizes the other figure as an erasure object;
A color changing unit that changes a color in the closed region when the erasing target recognition unit recognizes an erasing target;
A time measuring unit that measures an elapsed time from the time when the erasing object recognition unit recognizes the erasing object; and
When the elapsed time measured by the time measuring unit is within a predetermined time and a predetermined touch operation is performed on the closed region, the other figure and the closed A figure erasing unit for erasing the figure defining the area;
When the elapsed time measured by the time measuring unit exceeds the predetermined time, and the erasing by the graphic erasing unit is not performed, the recognition state of the erasing object recognition unit for the other graphic And a control unit including a recognition canceling unit for canceling the display.

Further, the present invention provides that the color changing unit is closed when the elapsed time measured by the time measuring unit exceeds the predetermined time and the erasing by the graphic erasing unit is not performed. and wherein the score back color after the change in the region before the change color.

  In the invention, it is preferable that the color changing unit changes a color of a portion other than the figure to be erased in the closed region when the color in the closed region is changed.

  In the invention, it is preferable that the color changing unit returns the color after the change in the closed region to the color before the change when the graphic erasing unit performs erasure.

  Further, according to the present invention, as the elapsed time measured by the time measuring unit approaches the predetermined time, the color changing unit gradually changes the color after the change in the closed region before the change. It is close to the color.

The present invention also includes a display unit having a display screen;
When a touch operation is performed on the display screen, a touch panel unit that acquires position information regarding the display screen of the touch operation;
A control unit for controlling the display unit,
A figure drawing unit for drawing a figure on the display screen according to the position information;
A closed region determination unit that determines whether or not the graphic drawn on the display screen is a graphic that defines a closed region;
When another figure has already been drawn in the closed region, an erasure target recognition unit that recognizes the other figure as an erasure target;
A time measuring unit that measures an elapsed time from the time when the erasing object recognition unit recognizes the erasing object; and
When the elapsed time measured by the time measuring unit is within a predetermined time and a predetermined touch operation is performed on the closed region, the other figure and the closed A figure erasing unit for erasing the figure defining the area;
When the elapsed time measured by the time measuring unit exceeds the predetermined time, and the erasing by the graphic erasing unit is not performed, the recognition state of the erasing object recognition unit for the other graphic A recognition cancellation unit for canceling
The predetermined specific touch operation is a linear touch operation that passes through one point of a boundary line defining the closed region, a point in the closed region, and another point of the boundary line. It is a display system .

  In addition, the present invention is a display program that causes a computer including a touch panel unit and a display unit to function as the display system.

  According to the present invention, after drawing a certain figure, a figure surrounding the figure can be drawn, so that the certain figure can be an erasure target. Then, by performing a specific touch operation within a specific time after a certain graphic becomes an erasure target, it is possible to erase the graphic to be erased and the graphic surrounding the graphic to be erased. In addition, by not performing a specific touch operation within a specific time after a certain graphic is to be erased, a graphic surrounding the graphic to be erased can be left on the display screen. In this way, a user-friendly display system that can draw and erase graphics without changing the mode can be provided.

Also, after drawing a certain shape, the draw shapes surrounding the figure, the color of the portion surrounded is changed. As a result, it is possible to notify the location that is to be erased.
Further, according to the present invention, colors other than the graphic to be erased in the closed region are changed.

  Further, according to the present invention, when the graphic to be erased is erased, the color other than the graphic to be erased in the closed region returns from the color after the change to the color before the change.

Further, according to the present invention, the changed color gradually returns to the original color, so that it can be notified that a specific time is about to elapse.
Further, according to the present invention, it is possible to erase a graphic to be erased by an intuitive touch operation.

  Moreover, according to this invention, the display program which makes a computer provided with a touchscreen part and a display part function as the said display system can be provided.

1 is a schematic diagram showing an appearance of a display system 1. FIG. 1 is a block diagram illustrating a configuration of a display system 1. FIG. It is a figure which shows the example of a detection of a loop. It is a figure which shows the example of recognition of the figure of erasure | elimination object. It is a figure which shows a mode that a figure is erase | eliminated by the figure deletion part 135. FIG. It is a figure which shows the process before the recognition of the erasure | elimination object by the erasure | elimination object recognition part 133. FIG. It is a figure which shows the process after recognition of the erasure | elimination object by the erasure | elimination object recognition part 133. FIG.

  Below, the display system 1 which is one of the embodiment of this invention is demonstrated. FIG. 1 is a schematic diagram showing an appearance of the display system 1. The display system 1 is an electronic blackboard having, for example, a substantially rectangular display screen 111 having a length of about 100 cm and a width of about 150 cm. When a touch operation is performed, a graphic corresponding to the touch operation is displayed as an image on the display screen 1. 111.

  Here, the touch operation is a series of operations from the start of pressing on the display screen 111 to the end of pressing. For example, a series of operations in which the user presses the display screen 111 with a finger or a stylus, slides the pressed portion while pressing, and moves the finger or stylus away from the display screen 111. In addition, the figure corresponding to the touch operation is more specifically a figure corresponding to the pressed location by the touch operation. For example, when the pressed location moves in a line shape in the touch operation, the locus of the pressed location to move. In this case, the graphic representing the trajectory of the touch operation is a line shape.

  As a known system for displaying a graphic corresponding to a touch operation as an image as described above, a system including a conventionally known PC and a display device such as a touch panel integrated display PN-L600B (manufactured by Sharp Corporation). Can be mentioned. In the present embodiment, a display program, which is a program for causing the functions of the units 131 to 139 to be described later, to be stored in such a system is stored. In addition, as other embodiment of this invention, a display apparatus provided with IC (Integrated Circuit) chip which each exhibits the function of each part 131-139 mentioned later may be sufficient. The display system according to the present invention may be a portable tablet PC (Personal Computer) instead of the electronic blackboard.

  FIG. 2 is a block diagram illustrating a configuration of the display system 1. The display system 1 includes a display unit 11, a touch panel unit 12, and a control unit 13.

  The display unit 11 is, for example, a liquid crystal display, an EL (ElectroLuminescence) display, a plasma display, and the like, and displays an image on the display screen 111. As another embodiment of the present invention, the display unit 11 may be a projector that uses a screen as the display screen 111 and projects an image on the display screen 111.

  The touch panel unit 12 includes a projected capacitive touch panel, a resistive touch panel, an infrared cut-off detection touch panel, and the like. When a touch operation is performed, information indicating a position where the touch operation is performed on the display screen 111, That is, position information indicating a location pressed by a touch operation is acquired. Since the place pressed by the touch operation is an area where the size of the stylus or the user's finger is continuous, the position information is acquired as information indicating the representative position of the area, for example, the centroid position. . In the present embodiment, the touch panel unit 12 is a projection type electrostatic that can acquire position information corresponding to each area when two or more areas that are separated from each other are pressed. It is a capacitive touch panel.

  The control unit 13 includes a control arithmetic circuit such as a CPU (Central Processing Unit), a volatile memory such as a DDR SDRAM (Double Data Rate Synchronous Dynamic Random Access Memory), a flash ROM (Read Only Memory), and an EEPROM (registered trademark). The display unit 11 and the touch panel unit 12 are controlled by a nonvolatile memory such as an HDD (Hard Disk Drive). The display program according to the present invention is stored in the non-volatile memory of the control unit 13, whereby the control unit 13 exhibits the functions of the following units 131 to 139.

  The control unit 13 includes a graphic drawing unit 131, a closed region determination unit 132, an erasure target recognition unit 133, a time measurement unit 134, a graphic erasure unit 135, a recognition release unit 136, a color change unit 137, a command storage unit 138, and a command setting. The function of the storage unit 139 is provided.

  The graphic drawing unit 131 includes a touch operation information management unit 1311. When a touch operation is performed, a graphic corresponding to the touch operation is displayed as an image at a position indicated by position information regarding the touch operation. More specifically, the touch operation information management unit 1311 stores the position information corresponding to the touch operation and the time when the position information is acquired in association with each other. Based on the information stored in the touch operation information management unit 1311, the graphic drawing unit 131 draws the graphic corresponding to the touch operation at the position indicated by the position information in order of the acquired time. In the present embodiment, when a multi-touch operation is performed, the figure drawing unit 131 draws a figure at a position indicated by each piece of position information for each touch operation.

  Drawing of a figure by the figure drawing unit 131 is performed according to a display command stored in the command setting storage unit 139. The command setting storage unit 139 stores any one of a plurality of display commands stored in the command storage unit 138. The display command stored in the command setting storage unit 139 is information that predetermines one correspondence relationship between the touch operation and the graphic displayed on the display screen 111 before the touch operation is performed. That is, when a touch operation is performed, the figure drawing unit 131 draws a figure corresponding to the touch operation according to the display command stored in the command setting storage unit 139 at the time when the position information is acquired for the touch operation. To do.

  Examples of the display command include a black pen command, a red pen command, and an eraser command. The black pen command is a command for setting a figure drawn by the figure drawing unit 131 to a figure that represents a locus of a touch operation with a black line having a predetermined thickness. The red pen command is a command for setting a figure drawn by the figure drawing unit 131 to a figure that represents a locus of a touch operation with a red line having a predetermined thickness. The eraser command is information for setting the figure drawn by the figure drawing unit 131 to a figure that represents the locus of the touch operation with a line of a predetermined thickness, and the color of each part of the line is changed to each part. This is information set to the same color as the background color. That is, when the display command stored in the command setting storage unit 139 is an eraser command, when a touch operation is performed on a graphic drawn on the display screen 111, the graphic is deleted from the display screen 111.

  The command storage unit 138 stores such display commands in association with the corresponding icons. For example, a black pen command and a black pen icon are associated, a red pen command and a red pen icon are associated, and an eraser command and an eraser icon are associated and stored. The command setting storage unit 139 selects and stores one command among a plurality of display commands in accordance with the touch operation on these icons. Specifically, the command setting storage unit 139 displays a toolbar image that is an image including a plurality of icons stored in the command storage unit 138 in a predetermined area of the display screen 111. Then, the command setting storage unit 139 determines whether or not the touch operation has been performed on any one icon in the toolbar image based on the information stored in the touch operation information management unit 1311, and the touch operation is performed. Stores the command associated with the icon for which.

  In the present invention, in addition to erasing a figure by an eraser command as described above, the figure erasing unit 135 can erase the figure. The graphic erasure unit 135 is a feature of the present invention, and is based on processing by the graphic drawing unit 131, the closed region determination unit 132, the erasure target recognition unit 133, the time measurement unit 134, the recognition release unit 136, and the color change unit 137. Delete the figure. Hereinafter, assuming that the command stored in the command setting storage unit 139 is a black pen command, each of these units 131 to 137 will be described.

  The closed region determination unit 132 determines whether the graphic drawn on the display screen 111 by the graphic drawing unit 131 is a graphic that defines the closed region. Here, the “figure defining the closed region” is a figure drawn by one touch operation and having one or more loops. For example, “○” or “□” written in a single stroke is a graphic that defines a closed region, and “no” or “8” written in a single stroke is also a graphic that defines a closed region.

  Based on the information stored in the touch operation information management unit 1311, the closed region determination unit 132 determines whether a graphic defining the closed region has been drawn by a conventionally known loop detection method. For example, when the touch operation is performed, the closed region determination unit 132 determines whether or not there is an intersection on the touch operation locus based on information stored in the touch operation information management unit 1311. If the same position information is stored in the touch operation information management unit 1311 at different times in one touch operation, a point corresponding to the position information becomes an intersection. The closed region determination unit 132 detects each point corresponding to each piece of position information stored from the time when the intersection is passed for the first time until the time when the intersection is passed for the second time as a point constituting the loop.

  FIG. 3 shows an example of loop detection. In FIG. 3, the coordinate values of the horizontal axis are A to Z, the coordinate values of the vertical axis are 1 to 25, and the coordinates of each point are represented. In FIG. 3A, (F, 2) is the starting point, and (F, 3), (G, 3), (H, 3), (I, 3), (J, 3), (K, 3 ), (L, 3), (M, 3), (N, 3), (O, 3), (P, 3), ..., (F, 6), (G, 6), (G , 5), (H, 5), (H, 4), (I, 4), (I, 3), (J, 3), (J, 2), (K, 2) in this order. As shown, an example is shown in which a single touch operation is performed with (K, 1) as the end point. In the example of FIG. 3A, the point (I, 3) is first detected as an intersection point in one touch operation. Therefore, as shown in FIG. 3B, (I, 3), (J, 3), (K, 3), (L, 3), (M, 3), (N, 3), (O , 3), (P, 3), ..., (F, 6), (G, 6), (G, 5), (H, 5), (H, 4), (I, 4) Each point is detected as a point constituting a loop.

  The erasure target recognition unit 133 recognizes another graphic as an erasure target when another graphic has already been drawn in the closed region. That is, before the figure that defines the closed area (the figure that has the loop) is drawn, another figure is already drawn, and the figure that defines the closed area is drawn so that this other figure enters the loop When this is done, the erasure object recognition unit 133 recognizes this other graphic as an erasure object.

  Specifically, the erasure target recognition unit 133 extracts a graphic in the loop detected by the closed region determination unit 132 by a conventionally known graphic extraction method and recognizes it as a erasure target graphic. For example, the erasure target recognition unit 133 forms a loop based on the information stored in the touch operation information management unit 1311, and the coordinate value on the horizontal axis is the smallest among a plurality of points having the same coordinate value on the vertical axis. If there is a point that has already been drawn (drawing point) other than the points that make up the loop between the point that becomes the value and the point that becomes the maximum value, Recognizes the drawing point as a partial point of the figure to be erased. Then, the erasure target recognition unit 133 makes this determination for all values from the minimum value to the maximum value of the coordinate values on the vertical axis at a plurality of points constituting the loop. As a result of determining all the values, if the number of points recognized as erasure targets is a predetermined number (for example, 5) or less, the erasure object recognition is performed so that the points are not erasure targets. The unit 133 may be configured.

  FIG. 4 shows an example of recognition of a graphic to be erased. FIG. 4 shows an example in which the figure “x” indicated by the shaded area has already been drawn in the loop detected in FIG. 3B before the drawing of the loop. In the example of FIG. 4, the erasure target recognition unit 133 first configures a loop, and among the plurality of points whose vertical axis coordinate value is “3”, the point (I 3) and the point (R, 3) having the maximum value, it is determined whether or not there is a drawing point other than the points constituting the loop. A point that is neither a point constituting a loop nor a drawing point is determined as a non-drawing point in the loop. In the example of FIG. 4, when the coordinate values on the vertical axis are “3” to “8”, the point to be erased is not recognized. When the coordinate value on the vertical axis is “9”, the erasure object recognition unit 133 is between the point (D, 9) where the coordinate value on the horizontal axis is the minimum value and the point (X, 9) where the coordinate value is the maximum value. The drawing points (J, 9) and (R, 9) are recognized as points to be erased. The erasure target recognition unit 133 performs the same processing until the coordinate value on the vertical axis becomes “24”.

  In the present embodiment, when the entire loop is composed of non-drawing points, the erasure target recognition unit 133 recognizes that the graphic to be erased is a 0 graphic (virtual graphic). In addition, when a plurality of figures defining closed areas are drawn, the erasure target recognition unit 133 recognizes the erasure target figures in the order from the earliest time when the loop is drawn for the figures defining each closed area.

  The time measuring unit 134 measures the elapsed time from when the erasure target recognition unit 133 recognizes the graphic to be erased. Note that the time measurement unit 134 individually measures the elapsed time when a plurality of figures are recognized as erasure targets by the erasure target recognition unit 133.

  When the elapsed time measured by the time measuring unit 134 is within a predetermined time (erasable time) determined in advance, the figure erasing unit 135 applies in advance to the closed region where the graphic to be erased is drawn. When a predetermined specific touch operation (erase touch operation) is performed, the figure to be erased in the closed area and the figure defining the closed area are erased. When the figure to be erased is 0 figure, since the figure to be erased is not substantially recognized, the erasure processing of the figure to be erased is not performed.

  The erasable time is set, for example, within a range of 3 seconds to 15 seconds. The erase touch operation is, for example, a linear touch operation that passes through a point in the loop that defines the closed area where the figure to be erased is drawn, a point in the loop, and another point in the loop. It is. In this embodiment, since the command stored in the command setting storage unit 139 is a black pen command, a black linear figure is drawn by the figure drawing unit 131 in accordance with the erase touch operation. The erasing unit 135 erases this graphic together with the graphic to be erased.

  When the erasure target recognition unit 133 recognizes the erasure target graphic, the color change unit 137 changes the color of the point in the loop in which the erasure target graphic is drawn. Further, the color changing unit 137 gradually brings the color in the loop whose color has been changed closer to the color before the change as the elapsed time measured by the time measuring unit 134 approaches the erasable time, and the time measuring unit When the elapsed time measured by 134 exceeds the erasable time and the graphic erasure unit 135 has not erased the graphic, the color in the loop whose color has been changed is returned to the color before the change.

  For example, when the inside of the loop is composed of drawing points and non-drawing points (white points that are the background colors), the color changing unit 137 does not change the color of the drawing points, The color is changed to red, and this red point is changed from red to pink to light pink as time passes. When the elapsed time exceeds the erasable time, the non-drawing point is returned to white. In addition, when the graphic erasure unit 135 erases the graphic, the color changing unit 137 returns the color in the loop whose color has been changed to the color before the change at that time.

  Note that the color to be changed need not be red, but may be any color other than the background color. In addition, since there may be all the drawing points in the loop, the color changing unit 137 may be configured to change the drawing point to a color that is a mixture of the color of the drawing point and red.

  The recognition cancellation unit 136 is an erasure target recognition unit for a graphic in the loop when the elapsed time measured by the time measurement unit 134 exceeds the erasable time and the graphic erasure unit 135 has not erased the graphic. The recognition state 133 is canceled. Note that the recognition canceling unit 136 cancels the recognition state at the time when the graphic erasing unit 135 erases the graphic. In addition, when there are a plurality of figures that define the closed region, the time measurement by the time measurement unit 134 is performed individually, so that the recognition state is individually released.

  FIG. 5 shows how the figure is erased by the figure erasing unit 135. FIG. 5A shows an example in which a character string “September degree regular meeting 1 assignment” is drawn on the display screen 111. FIG. 5B shows an example in which a graphic defining a closed region (graphic having a loop) is drawn. In this example, the loop encloses “1” in the character string. FIG. 5C shows an example in which the color in the loop is changed by the color changing unit 137. FIG. 5D shows an example in which the erase touch operation is performed within the erasable time. In this example, the erase touch operation is a linear touch operation that extends from the upper left point to the lower right point from the loop. FIG. 5E shows an example in which the character “1” is erased by the graphic erasure unit 135.

  If the erasing touch operation as shown in FIG. 5D is not performed, the display screen 111 is in the state shown in FIG. In the above example, the command stored in the command setting storage unit 139 is a black pen command, but may be another command such as an eraser command. In the case of the eraser command, the figure defining the closed area is not drawn, but it is possible to determine whether or not a loop touch operation has been performed based on the information of the touch operation information management unit 1311. As in the case, the figure in the loop is deleted.

  In the above embodiment, even if there is no drawing point in the loop, the erasure target recognition unit 133 deletes the 0 figure (virtual figure) as the erasure target so that the loop itself can be erased by the erase touch operation. The color changing unit 137 changes the color in the loop. However, in another embodiment of the present invention, the erasing target recognition unit 133 can delete the erasing target only when there is a drawing point in the loop. The figure may be recognized, and the color changing unit 137 may be configured to change the color in the loop.

  The operation of another embodiment configured as described above is shown in the flowcharts of FIGS. The flowchart in FIG. 6 shows the process before the erasure target recognition unit 133 recognizes the erasure target, and the flowchart in FIG. 7 shows the process after the erasure target recognition unit 133 recognizes the erasure target.

  In step S <b> 1, the touch panel unit 12 detects the presence / absence of contact with a user's finger or the like, and when detected, the contact position is detected and input to the control unit 13 in step S <b> 2. In step S3, the command setting storage unit 139 determines whether or not the contact position is within the icon. If the contact position is within the icon, the process proceeds to step S4, stores the command corresponding to the icon, and returns to step S1. If it is not within the icon, the process proceeds to step S5.

  In step S5, the graphic drawing unit 131 determines whether or not a touch operation (drag operation) for moving the display screen 111 while pressing the display screen 111 is started based on information stored in the touch operation information management unit 1311. When the drag operation is started, the process proceeds to step S6, and a figure corresponding to the drag operation is drawn. When the drag operation is not started, the drawing at the point detected in step S2 is performed, and the process returns to step S1.

  In step S7, the graphic drawing unit 131 determines whether or not the drag operation has ended based on the information stored in the touch operation information management unit 1311, and returns to step S6 to draw a graphic until it ends. If yes, go to Step S8.

  In step S8, the closed region determination unit 132 determines whether or not there is an intersection in the drag operation locus based on information stored in the touch operation information management unit 1311. If there is an intersection, step S9 Go to, and perform loop detection. If there is no intersection, the process returns to step S1.

  In step S10, the erasure target recognition unit 133 determines whether a figure is drawn in the loop based on information stored in the touch operation information management unit 1311. If the figure is drawn, step S11 is performed. If not drawn, the process returns to step S1.

  In step S11, the erasure target recognition unit 133 recognizes the graphic drawn in the loop as the erasure target graphic. In addition, the time measuring unit 134 starts measuring elapsed time. Further, the color changing unit 137 colors the colors in the loop with the initial lightness level (for example, lightness value 120) of the designated color (for example, red).

  In step S12, the touch panel unit 12 detects the presence / absence of contact with a user's finger or the like. If detected, the process proceeds to step S13. If not detected, the process proceeds to step S14. In step S14, it is determined whether or not the elapsed time measured by the time measuring unit 134 has exceeded a predetermined time. If it has exceeded, the process proceeds to step S15, and if not, the process returns to step S12. For example, the predetermined time is set to 1 / X (X is a number larger than 1) of the erasable time.

  In step S15, it is determined whether or not the elapsed time measured by the time measuring unit 134 has exceeded the erasable time. If it has exceeded, the process proceeds to step S17, and if not, the process proceeds to step S16. In step S16, the color in the loop is colored by increasing the lightness level by one level (for example, the lightness value is 50) while maintaining the saturation of the designated color. Then, the predetermined time is reset to the original predetermined time plus 1 / X of the erasable time, and the process returns to step S12.

  In step S <b> 13, the touch panel unit 12 detects the contact position and inputs it to the control unit 13. In step S18, the command setting storage unit 139 determines whether or not the contact position is within the icon, and if it is within the icon, the process proceeds to step S19, stores the command corresponding to the icon, and proceeds to step S17. If it is not within the icon, the process proceeds to step S20.

  In step S20, the graphic drawing unit 131 determines whether or not the drag operation is started based on information stored in the touch operation information management unit 1311. If the drag operation is started, the process proceeds to step S21. Proceed to draw a figure corresponding to the drag operation. When the drag operation is not started, the drawing at the point detected in step S12 is performed, and the process proceeds to step S17.

  In step S22, the graphic drawing unit 131 determines whether or not the drag operation has been completed based on the information stored in the touch operation information management unit 1311. The graphic drawing unit 131 returns to step S21 until drawing is completed. If yes, go to Step S23.

  In step S23, the graphic erasure unit 135 determines whether or not an erasure touch operation has been performed based on information stored in the touch operation information management unit 1311. If the erasure touch operation has been performed, the process proceeds to step S24. If not, the process proceeds to step S17. The erase touch operation is, for example, a touch operation that traces a predetermined number of points in the loop.

  In step S24, the graphic erasing unit 135 erases the graphic in the loop. In addition, the erasure target recognition unit 133 is released from the recognition state of the erasure target by the recognition release unit 136. Further, the time measuring unit 134 stops measuring time. The color changing unit 137 returns the color in the loop to the color before coloring, and resets the predetermined time to 1 / X of the erasable time.

  In step S <b> 17, the erasure target recognition unit 133 is released from the erasure target recognition state by the recognition release unit 136. Further, the time measuring unit 134 stops measuring time. The color changing unit 137 returns the color in the loop to the color before coloring, and resets the predetermined time to 1 / X of the erasable time.

  In the display system 1 as described above, after a certain figure is drawn, a figure surrounding the figure can be drawn, so that a certain figure can be an erasure target. Then, by performing a specific touch operation (erase touch operation) within a specific time (erasable time) after a certain figure becomes an object to be erased, the figure to be erased and the figure surrounding the figure to be erased are erased. can do. Further, by not performing a specific touch operation within a specific time (erasable time) after a certain graphic becomes an erasure target, it is possible to leave the graphic surrounding the erasure target graphic on the display screen 111. In this way, the display system 1 is a user-friendly display system that can draw and erase graphics without changing the mode. In particular, the present embodiment is configured so that multi-touch operation is possible, but even when two or more users individually perform touch operations, it is possible to erase the figures individually, which is highly convenient.

  Further, according to the display system 1, after drawing a certain figure and drawing a figure surrounding the figure, the color of the enclosed part is changed. As a result, the user can be notified of the location that is to be erased.

  Further, according to the display system 1, the changed color gradually returns to the original color, so that the user can be notified that the erasable time is about to elapse. In the above embodiment, the color fades in steps and returns to the original white every 1 / X of the erasable time. However, the color may be restored continuously. Good.

  The display program stored in the control unit 13 of the display system 1 is a program that causes a computer including a touch panel unit and a display unit to function as the display system 1. This display program can be recorded on a conventionally known computer-readable recording medium.

  By recording the display program on a recording medium, it is possible to provide a portable recording medium on which a program code (execution format program, intermediate code program, source program, etc.) for executing processing based on the display program is recorded. it can.

  The recording medium may be a memory for the microcomputer to perform processing, for example, a program medium such as a ROM (Read Only Memory), or may be inserted into a program reading device provided as an external storage device in the computer. It may be a program medium that can be read.

  The program stored in the recording medium may be a system in which the microprocessor accesses the recording medium and executes the program, or the microprocessor reads the program code from the recording medium, and the read program code is the micro program. The program may be executed by being downloaded to the program storage area of the computer. It is assumed that this download program is stored in the main device in advance.

  Here, the program medium is a recording medium configured to be separable from the main body, and includes a tape system such as a magnetic tape and a cassette tape, a magnetic disk such as a flexible disk and a hard disk, and a CD-ROM (Compact Disc-Read Only Memory). ), Optical disk such as MO (Magneto Optical disc), MD (Mini Disc), DVD (Digital Versatile Disc), card system such as IC card (including memory card), optical card, mask ROM, EPROM ( It may be a medium carrying a fixed program code including a semiconductor memory such as an Erasable Programmable Read Only Memory), an EEPROM (registered trademark), or a flash ROM.

  In addition, if the computer has a system configuration capable of connecting to a communication network including the Internet, the recording medium may be a medium that dynamically carries the program code so as to download the program code from the communication network. When the program is downloaded from the communication network as described above, the download program is stored in the main device in advance or installed from another recording medium. The display program can also be realized in the form of a computer data signal embedded in a carrier wave in which the program code is embodied by electronic transmission.

DESCRIPTION OF SYMBOLS 1 Display system 11 Display part 12 Touch panel part 13 Control part 111 Display screen 131 Graphic drawing part 132 Closed area judgment part 133 Erase object recognition part 134 Time measurement part 135 Graphic erasure part 136 Recognition release part 137 Color change part 138 Command storage part 139 Command setting storage

Claims (7)

A display unit having a display screen;
When a touch operation is performed on the display screen, a touch panel unit that acquires position information regarding the display screen of the touch operation;
A control unit for controlling the display unit,
A figure drawing unit for drawing a figure on the display screen according to the position information;
A closed region determination unit that determines whether or not the graphic drawn on the display screen is a graphic that defines a closed region;
When another figure has already been drawn in the closed region, an erasure object recognition unit that recognizes the other figure as an erasure object;
A color changing unit that changes a color in the closed region when the erasing target recognition unit recognizes an erasing target;
A time measuring unit that measures an elapsed time from the time when the erasing object recognition unit recognizes the erasing object; and
When the elapsed time measured by the time measuring unit is within a predetermined time and a predetermined touch operation is performed on the closed region, the other figure and the closed A figure erasing unit for erasing the figure defining the area;
When the elapsed time measured by the time measuring unit exceeds the predetermined time, and the erasing by the graphic erasing unit is not performed, the recognition state of the erasing object recognition unit for the other graphic display system characterized in that it comprises a control unit including a recognition releasing portion, the releasing the. The color changing unit, after the change in the closed region, when the elapsed time measured by the time measuring unit exceeds the predetermined time and the erasing by the graphic erasing unit is not performed display system according to claim 1, wherein the scores return to the pre-change color color.   3. The display system according to claim 2, wherein the color changing unit changes a color of a portion other than the figure to be erased in the closed region when changing a color in the closed region.   The display system according to claim 3, wherein the color changing unit returns the color after the change in the closed region to the color before the change when the graphic erasing unit performs erasure. .   The color changing unit is configured to gradually bring the changed color in the closed region closer to the color before the change as the elapsed time measured by the time measuring unit approaches the predetermined time. 5. The display system according to claim 4, wherein A display unit having a display screen;
When a touch operation is performed on the display screen, a touch panel unit that acquires position information regarding the display screen of the touch operation;
A control unit for controlling the display unit,
A figure drawing unit for drawing a figure on the display screen according to the position information;
A closed region determination unit that determines whether or not the graphic drawn on the display screen is a graphic that defines a closed region;
When another figure has already been drawn in the closed region, an erasure object recognition unit that recognizes the other figure as an erasure object;
A time measuring unit that measures an elapsed time from the time when the erasing object recognition unit recognizes the erasing object; and
When the elapsed time measured by the time measuring unit is within a predetermined time and a predetermined touch operation is performed on the closed region, the other figure and the closed A figure erasing unit for erasing the figure defining the area;
When the elapsed time measured by the time measuring unit exceeds the predetermined time, and the erasing by the graphic erasing unit is not performed, the recognition state of the erasing object recognition unit for the other graphic A recognition cancellation unit for canceling
The predetermined specific touch operation is a linear touch operation that passes through one point of a boundary line defining the closed region, a point in the closed region, and another point of the boundary line. Viewing system shall be the.   A display program that causes a computer including a touch panel unit and a display unit to function as the display system according to any one of claims 1 to 6.

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