JPH0370078A - Display device for line picture data - Google Patents

Abstract

PURPOSE:To display a line picture at a high speed with the features of an original graphic kept as they are based on the line picture data for high speed display having a small data quantity which is obtained by simplification by simplifying and storing the read line picture data via a data conversion part with the data features left as they are. CONSTITUTION:When the line picture data and the degree of its simplification are designated, the designated line picture data is read into a data conversion part 1 from a line picture store part 4. Then the line picture data is simplified in accordance with the designated degree with the features of a graphic defined based on the line picture data and left as they are and then converted into the high speed display line picture data. This data is stored in a high speed display line picture data store part 5. Meanwhile a line picture obtained based on the high speed display line picture data is displayed at a display part 3 with input of a list of line picture data to be displayed on a display device. As a result, the line picture can be displayed at a high speed based on the simplified high speed display line picture data of a small quantity.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a line drawing data display device that displays line drawing data created by a CAD system or the like at high speed.

<Prior art> Conventionally, when confirming the shape of a figure expressed by line drawing data created by a CAD system, etc., a line drawing display system that displays line drawings based on the created line drawing data is used to display the original line drawing. A method of displaying line drawings based on data has been adopted.

<Problems to be Solved by the Invention> However, in the above conventional method for confirming figure shapes based on line drawing data, it is difficult to search for the required line drawing while looking at the displayed line drawing, or when the amount of line drawing data is large. When it is necessary to identify a large number of line drawings in a short period of time, as in the case of the case, there is a problem in that it takes an unrealistically long time unless a highly specialized and expensive system is used.

Therefore, an object of the present invention is to simplify line drawing data obtained by a CAD system or the like to obtain line drawing data for high-speed display, and to display line drawings at high speed on a display device based on the obtained line drawing data for high-speed display. An object of the present invention is to provide a line drawing data display device.

<Means for Solving the Problems> In order to achieve the above object, the line drawing data display device of the present invention includes a line drawing data storage section that stores line drawing data, and a line drawing data display device that displays line drawing data from among the line drawing data stored in the line drawing data storage section. Loads the specified line drawing data, and simplifies the read line drawing data according to the specified degree of simplification while retaining the features of the figure based on the line drawing data, making it suitable for high-speed display. a data conversion unit that converts into line drawing data; a line drawing data storage unit for high speed display that stores the line drawing data for high speed display obtained by the data conversion unit; and a line drawing data storage unit for high speed display that stores the line drawing data for high speed display according to the input line drawing data list. The present invention is characterized by comprising a data display section that reads necessary line drawing data for high-speed display from the section and displays a line drawing based on the read line drawing data for high-speed display on a display device.

Further, the data conversion unit in the line drawing data display device is configured to simplify the line drawing data stored in the line drawing data storage unit according to a predetermined rule and convert it into line drawing data for temporary high speed display. a line drawing data converting means, and a plurality of regions obtained by dividing the line drawing data for temporary high-speed display into sizes corresponding to the degree of simplification of the line drawing space based on the line drawing data for temporary high-speed display. A line drawing data generation means for overlapping which converts into a coordinate system of coordinates to be expressed and generates line drawing data for overlapping; Executes overlapping to remove the overlap of multiple overlapping line drawing data that overlaps in one area and integrates them into one, and also performs overlapping line drawing data that has been overlapping and its corresponding temporary high speed. a first superimposing means for generating superimposing information regarding display line drawing data; and a temporary superimposing means corresponding to the superimposing line drawing data superimposed by the first superimposing means with reference to the superimposing information. a second superimposing means for selecting line drawing data for temporary high-speed display and performing the above-mentioned superimposition on the selected line drawing data for temporary high-speed display to generate line drawing data for high-speed display; is desirable.

<Operation> The line drawing data to be subjected to the high-speed display line drawing data generation process and the degree of simplification at that time are specified. Then, the specified line drawing data is read from the line drawing data storage section to the data conversion section, and the read line drawing data is converted according to the degree of simplification while retaining the features of the figure based on the line drawing data. The data is simplified and converted into line drawing data for high-speed display. The obtained line drawing data for high speed display is stored in the line drawing data storage unit for high speed display.

On the other hand, a list of line drawing data to be displayed on the display device is input. Then, necessary line drawing data for high speed display is read into the data display section from the line drawing data storage section for high speed display according to this line drawing data list. Then, a line drawing based on the read high-speed display line drawing data is displayed on the display section.

Therefore, line drawings are displayed at high speed based on simplified line drawing data for high speed display with a small amount of data.

Further, the data converting section in the line drawing data display device uses a line drawing data converting means for temporary high-speed display to
The line drawing data is simplified according to a predetermined rule and converted into line drawing data for temporary high-speed display. Then, the overlapping line drawing data generation means divides the line drawing space based on the temporary high-speed display line drawing data into sizes based on the degree of simplification, and converts it into a coordinate system of coordinates representing multiple regions obtained by dividing the line drawing space based on the temporary high-speed display line drawing data into sizes based on the degree of simplification. Line drawing data for superimposition is generated by converting the line drawing data for temporary high-speed display. Then, the first overlapping means performs overlapping on the line drawing data for overlapping to generate overlapping information. Then, referring to the overlapping information, the second overlapping means performs the overlapping on the temporary high-speed display line drawing data corresponding to the overlapping line drawing data, and displays the temporary high-speed display line drawing data at high speed. If the line drawing data is generated, it is possible to simplify the line drawing data according to a predetermined rule, and to integrate graphic elements that appear to overlap according to the specified degree of simplification. Line drawing data is converted into line drawing data for high-speed display with a small amount of data.

<Example> Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments.

FIG. 1 is a block diagram of an embodiment of the line drawing data display device of the present invention. This line drawing data display device is
A data converter 1 that simplifies line drawing data created by AD (hereinafter referred to as CAD data) and converts it into line drawing data for high-speed display for searching, and a data converter 1 that simplifies line drawing data created by AD (hereinafter referred to as CAD data) and converts it into line drawing data for high-speed display for searching, and converts the line drawing data for high-speed display converted by this data converter 1 into line drawing data for high-speed display. It is roughly composed of a data display section 2 that is displayed on a display device 3.

The data conversion unit 1 reads designated CAD data from the CAD data file 4 based on the name of the CAD data to be displayed that is input from the host system 6. Then, when the degree of simplification when simplifying CAD data is specified by a positive integer (hereinafter referred to as a simplification coefficient) from the host system 6, the data conversion unit l converts the read CAD data into a simplification coefficient. Accordingly, the data is converted into line drawing data for high speed display for searching and stored in the line drawing data file 5 for high speed display.

On the other hand, the data display section 2 receives the list of line drawing data for high speed display to be displayed on the display device 3 from the host system 6, reads the corresponding line drawing data for high speed display from the line drawing data file 5 for high speed display, and reads the line drawing data for high speed display from the line drawing data file 5 for high speed display. Display device 3 based on the read line drawing data for high-speed display.
Display line drawings sequentially. At that time, display device 3
It is possible to display a plurality of line drawings on one screen, making it easy to search for line drawings. Figure 7 shows 4 on one screen.
This is an example of displaying two line drawings.

Next, the procedure for converting CAD data into line drawing data for high-speed display performed by the data conversion section 1 will be described in detail.

FIG. 2 is a diagram showing the flow of a procedure for generating line drawing data for high-speed display performed in this embodiment.

This high-speed display line drawing data generation procedure is as follows: Step 1 Step 21
Consists of step 3 and step 4.

The data conversion unit l reads CAD data specified by the host system 6 from the CAD data file 4,
Convert to line drawing data for high-speed display.

At this time, in order to reduce the amount of data without losing the features of the figure based on the CAD data, two simplifications are implemented as described below.

l) Limitation of types of graphical elements and line drawing data 2) Integration of graphical elements that appear to overlap In this case, simplification l) is carried out using the procedure l described below,
Simplification 2) is performed in step 2.

(Step 1) Load CAD data from the CAD data file 4, limit the types of graphic elements and line drawing data according to the rules below, and create temporary high-speed display line drawing data (hereinafter referred to as temporary high-speed display line drawing data). ) to transform into Fchu-Mazuto. Then, the obtained temporary high-speed display line drawing data is transferred to a temporary high-speed display line drawing data file 7.
Store in.

- Rule 1: Attribute information is limited to color and line type only.

In addition, the number of colors is limited to a maximum of 256, Line types are limited to a maximum of 16 types.

- Rule [12...Elements of line drawing data that make up CAD data are points, line segments, 1 circle, 7 arcs, 1 character string.

Limited to 5 types of filled surfaces.

・Rule 3: Coordinate data that determines the position of the figure (all data should be two-dimensional data, and the coordinates must be converted so that the figure fits within the range that can be expressed with a 2-byte integer (i.e., so that it fits on one screen) and have it as an integer value.

By doing this, when displaying Clipping becomes unnecessary.

("! 2 ') The line drawing space indicated by the temporary high-speed display line drawing data obtained in step 1 is
As shown in the figure, the base is divided into mesh shapes and numbers are assigned to each of the X and X directions, and these numbers are used as the coordinates of each square. Then, the line drawing data for temporary high-speed display is converted into this coordinate system to generate line drawing data for superimposition and stored in the line drawing data file 8 for superimposition.

At that time, the size of the square is set to match the display resolution of the display device 3 when the simplification coefficient is
xl 024 pixel raster type, and when displaying line drawings based on four line drawing data on one screen as shown in Figure 7, the size of the square when the simplification coefficient is The size is such that 512 squares can be arranged in the X direction and in the X direction per line drawing.Therefore, when the simplification coefficient is "n", 512 cells can be arranged in the The number of squares that can be made is 512/n
becomes. By setting the size of the square (that is, the value of n) small in this way, the line drawing displayed on the display device 3 becomes a line drawing that is almost visually the same as a line drawing of the same size based on the original CAD data. .

(Step 3) Line segments that have the same color and line type (type of line shape such as solid line or dotted line) included in the overlapping line drawing data generated in step 2 above and overlap in one square Delete or merge. Hereinafter, such deletion or integration of line segments that overlap in one square will be referred to as overlapping. At that time, as shown in FIG. 3(a), in the line drawing data for temporary high-speed display, two line segments 101 and 102 that are not completely on the same line are changed as shown in FIG. 3(b). The overlapping line drawing data converted in step 2 is considered to be completely on the same straight line. In other words, the degree of simplification is determined by the size of the square. In this way, by converting the line drawing data for temporary high-speed display into the square coordinate system, overlapping is performed according to the simplification coefficient, so there is no need to calculate the distance between the two line segments to be integrated. There is no need to consider errors.

The specific overlapping operation is performed as follows according to the flowchart shown in FIG.

In step S1, the temporary high-speed display line drawing data is grouped by type of line drawing component. As a result, if the component is a point, the process proceeds to step S2, and the circle/
If it is an arc, the process proceeds to step S4, and if it is a line segment, the process proceeds to step S6.

In step S2, grouping is performed for each point having the same coordinates in the square.

In step S3, superimposition is performed for each group divided in step S2, and the superimposition for line drawings is completed.

In step S4, grouping is performed for each circle/arc having the same center coordinates.

In step S5, superimposition is performed for each group divided in step S4, and the superimposition for line drawings is completed.

In step S6, the line segment groups divided in step S4 are divided into horizontal line groups, vertical line groups, and other groups. As a result, if it is a horizontal line, the process proceeds to step S7, if it is a vertical line, the process proceeds to step S9, and if otherwise, the process proceeds to step Sll.

In step S7, grouping is performed for each horizontal line having the same Y coordinate.

In step S8, overlapping is executed for each group divided in step S7, and overlapping for one line drawing is completed.

In step S9, grouping is performed for each vertical line having the same X coordinate.

In step S11, overlapping is executed for each group divided in step S9, and overlapping for one line drawing is completed.

In step Sll, groups having similar slopes are grouped.

In step S12, overlapping is executed for each group divided in step S11, and overlapping for one line drawing is completed.

At that time, information about which line segments and which line segments in the line drawing data for temporary high-speed display have been integrated into one based on the line drawing data for overlapping is stored as overlapping information in the overlapping information file 9. put. That is, as shown in FIG. 6, the overlapping line drawing data (for example, line segment 101') corresponding to the constituent elements of the line drawing data for temporary high-speed display (for example, line segment!o1. , line segment 102' and line segment !03°). As shown in FIG. 3, when line segment 101 and line segment 102 in the line drawing data for temporary high-speed display are integrated into one in the line drawing data for overlaying, the line segment in the line drawing data for overlapping 102° is deleted and replaced with line segment tot', so line segment 102 in the line drawing data for temporary high-speed display and line segment 101 in the line drawing data for overlapping
', and the relationship information is stored in the overlap information file 9 as overlap information.

(Step 4) Based on the superimposition information obtained in step 3 above, line drawing data for superimposition is superimposed among the line drawing data for temporary high speed display stored in the line drawing data file 7 for temporary high speed display. Select and reduce temporary high-speed display line drawing data corresponding to . That is, line segment 10
The temporary high-speed display line drawing data No. 2 is deleted. Then, the remaining temporary line drawing data for high speed display is stored in the line drawing data file 5 for high speed display as final line drawing data for high speed display.

In other words, if the simplification coefficient is increased to increase the size of the above-mentioned square, the number of constituent elements of the line drawing data for temporary high-speed display that overlap in one square will increase, so the line drawing data for temporary high-speed display that will be deleted will increase. The number of lines increases, and the amount of line drawing data can be significantly reduced. Therefore, the simplification coefficient n may be set so as to reduce the amount of line drawing data for high-speed display as much as possible within the range where the characteristics of the original figure remain.

Next, the display of line drawings executed in the data display section 2 will be described.

The data display unit 2 receives a list of line drawing data for high-speed display manually entered from the host system 6, reads the corresponding line-drawing data for high-speed display from the line drawing data file 5 for high-speed display, and sequentially displays them on the display device 3.

Generally, when creating line drawing data in a CAD system or the like, line drawing data outside the frame of the screen is not displayed. Therefore, when displaying, it is determined whether all line drawing data to be displayed is outside the screen frame, and line drawing data within the screen frame is judged. I am trying to display only the In addition, if you try to fit all of the line drawing data to be displayed on the screen, you have to check the area occupied by all the line drawing data on the screen, calculate the magnification, and then enlarge/reduce it according to the calculated magnification. Must be. However, in this embodiment, in step 1 above, the coordinates are determined so that all of the line drawing data for high-speed display will fit within one screen, so line drawing data like the conventional one will not fit within the frame of the screen. There is no need to determine whether it exists or not. In addition, all the line drawing data for high-speed display fits within one screen and the amount of data is small, so
Calculating the magnification when displaying a plurality of line drawings on the screen is a simple calculation, which requires less time and effort during display, and the display speed is fast.

When storing line drawing data for high speed display in the line drawing data file 5 for high speed display, it is necessary to
Two line drawing data files for high speed display may be prepared and stored therein, or one line drawing data file for high speed display may be prepared and stored therein for a plurality of CAD data. In the latter case, only one file opening is required when displaying a large amount of CAD data, so the actual data reading time is shortened and display can be performed at higher speed.

As described above, in this embodiment, the data conversion unit 1 receives the line drawing data name and simplification coefficient from the host system 6, and converts the CAD data read from the CAD data file 4 according to the predetermined rules in step l. Simplify and convert into line drawing data for temporary high-speed display. Next, in step 2, this line drawing data for temporary high-speed display is converted into a coordinate system consisting of coordinates representing a square of a size determined by the simplification coefficient n to generate further simplified line drawing data for superimposition. do. Furthermore, in step 3, overlapping is performed to integrate the overlapping line drawing data that overlaps in one square in the generated overlapping line drawing data, and based on the overlapping information obtained at that time, step 4 Then, the line drawing data for temporary high-speed display corresponding to the line drawing data for superimposing that has been superimposed is superimposed to obtain the line drawing data for high-speed display. Then, the obtained line drawing data for high speed display is stored in the line drawing data file 5 for high speed display.

Therefore, by optimally setting the simplification coefficient n, the obtained line drawing data for high-speed display has graphical features based on the original CAD data, and the number of data is considerably reduced. Therefore, the data display unit 2 can display line drawings on the display device 3 at high speed according to the list of line drawing data for high-speed display from the host system 6.
It is possible to perform a graphic search in a very short time, which would take an unrealistically long time with a normal device. Furthermore, as described above, the amount of line drawing data for high-speed display is quite small, so line drawing data can be stored with a small amount of data.

The rules used in step 1 of the above embodiment are not limited to the rules of this embodiment.

The overlapping algorithm in this invention is not limited to the algorithm in the above embodiment.

<Effects of the Invention> As is clear from the above, the line drawing data display device of the present invention reads specified line drawing data from the line drawing data storage section, and uses the data converting section to convert the read line drawing data into features of a figure. The remaining state is simplified and converted into line drawing data for high-speed display and stored in the line drawing data storage unit for high-speed display. When displaying, the data display unit reads the necessary line drawing data for high-speed display according to the list and displays this data. Since a line drawing based on the read line drawing data for high-speed display is displayed on the display device, the original figure is Line drawings that retain their characteristics can be displayed at high speed.

Therefore, according to the present invention, many line drawings can be identified in a short time when searching for line drawings without using a highly specialized and expensive system, which is highly effective in improving the efficiency of, for example, design work.

The data conversion section of the line drawing data display device includes line drawing data converting means 9 for temporary high-speed display and superimposed peripheral line drawing data generating means. The first overlapping means and the second overlapping means simplify the line drawing data according to a predetermined rule and convert it into line drawing data for temporary high-speed display, and further convert the line drawing data into line drawing data for temporary high-speed display according to a specified degree of simplification. By overlapping the above temporary high-speed display line drawing data, graphic elements that appear to overlap are integrated to obtain high-speed display line drawing data, so line drawing data created by a CAD system etc. can be simplified and converted into line drawing data for high-speed display according to predetermined rules and the specified degree of simplification, and based on the line drawing data for high-speed display with a small amount of data,
Line drawings that retain the characteristics of the original shape can be displayed at high speed.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the line drawing data display device of the present invention, FIG.
The figure is an explanatory diagram of line drawing data for temporary high-speed display and line drawing data for overlaying, Figure 4 is an explanatory diagram of squares used when generating line drawing data for overlaying, and Figure 5 is the step 3 in Figure 2. 6 is a diagram showing the relationship between the constituent elements of line drawing data for temporary high-speed display and the constituent elements of line drawing data for superimposition, and FIG. 7 is a display example on a display device. be. 1... Data conversion section, 2... Data display section,
3... Display device, 4... CAD data file, 5... Line drawing data file for high-speed display, 6... Upper system, 7... Line drawing data file for temporary high-speed display, 8...
・Line drawing data file for overlapping, 9...Overlapping information file.

Claims (2)

[Claims] (1) A line drawing data storage section for storing line drawing data; reading specified line drawing data from among the line drawing data stored in the line drawing data storage section; a data conversion unit that converts the line drawing data into high-speed display line drawing data suitable for high-speed display by simplifying the data according to a specified degree of simplification while retaining the characteristics; and a line drawing for high-speed display obtained by the data conversion unit. According to the line drawing data storage unit for high-speed display that stores data, and the input line drawing data list, the necessary line drawing data for high-speed display is read from the line drawing data storage unit for high-speed display, and the line drawing data for high-speed display that has been read is What is claimed is: 1. A line drawing data display device comprising: a data display unit that displays a line drawing based on a display device on a display device. (2) In the line drawing data display device according to claim 1,
The data conversion unit includes a temporary high-speed display line drawing data converting means for simplifying the line drawing data stored in the line drawing data storage unit according to a predetermined rule and converting the line drawing data into temporary high-speed display line drawing data; The line drawing data for temporary high-speed display is converted into a coordinate system of coordinates representing multiple regions obtained by dividing the line drawing space based on the temporary high-speed display line drawing data into sizes corresponding to the degree of simplification. a superimposing line drawing data generating means for generating superimposing line drawing data; Performs overlapping to remove the overlapping line drawing data for overlapping and integrate them into one, and also performs overlapping regarding the line drawing data for overlapping that has been overlaid and the corresponding line drawing data for temporary high-speed display. a first superimposing means that generates information; and selecting temporary high-speed display line drawing data corresponding to the superimposing line drawing data superimposed by the first superimposing means with reference to the superimposing information; Line drawing data characterized in that it is constituted by a second overlapping means that performs the above-mentioned overlapping on the selected line drawing data for temporary high-speed display to generate line drawing data for high-speed display. Display device.