JP2777628B2 - Graphic processing method and apparatus - Google Patents

Description

The present invention relates to a graphic processing method and apparatus, for example,
The present invention relates to a graphic processing method and apparatus suitable for removing a hidden figure by giving priority to a symbol figure when a symbol figure and another figure overlap in a pipe drawing or the like in which piping and wiring are drawn on a map. [Prior Art] Conventionally, as described in JP-A-59-2075, in a superimposed graphic erasing method relating to superimposed display of graphics, an overlapping portion is divided in advance on drawing information, and overlapping is performed. There was no figure processing. [Problem to be Solved by the Invention] In a facility drawing management system that manages a drawing in which a pipe for water, gas, electricity, etc., a wiring system diagram and a map are superimposed, vectorized drawing information is converted into XY as needed. Output using a drawing output device such as a plotter or an electrostatic plotter. At this time, for example, if there is a portion where the pipeline graphic and the symbol graphic on the pipeline overlap, the graphic below the symbol is also output while the portion overlaps. In a conventional handwritten drawing, such an overlapping portion is erased by removing one of the figures to make the drawing easy to see. However, in order to perform a drawing operation using a drawing output device in the same manner as a handwritten drawing, a part to be overlapped is conventionally divided on drawing information in advance, and graphic processing is performed so as not to overlap. In this method, since the drawing information is divided in the middle, there is a problem that it cannot be used when processing as continuous drawing information. As described in Japanese Patent Application Laid-Open No. 54-161839, priorities are given to figures,
When the symbol graphic overlaps another graphic, for example, the basic graphic, it is conceivable to erase a hidden portion of the basic graphic whose priority order is lower than the symbol graphic with the symbol graphic. That is, when each figure is set by image information (information specifying image information on each pixel by a bit value) constituting a plane, and when figures constituting a plane overlap each other, the video signal on the basic figure is scanned first. Then, if the video signal relating to the symbol figure is scanned, the image based on the signal scanned earlier is erased by the image based on the signal scanned later. However, even if the figures are simply given priorities, for example, if the basic figure is a straight figure and the symbol figure is a figure showing the mark of a capacitor, a part of the straight line of the basic figure is replaced with an electrode of the symbol figure. When the two parallel lines are overlapped, the video signal related to the basic graphic is scanned first, and then the video signal related to the symbol graphic is scanned, the straight line of the basic graphic existing between the two parallel lines is determined. It cannot be erased. In addition,
As described in Japanese Patent Application Laid-Open No. 60-239825, a method of deleting an overlapping area when a polygon overlaps a polygon has been proposed. However, in this method, an area where a closed polygon is formed is detected based on the basic figure and the priority figure with respect to the overlap between polygons, so that the area to be deleted is extracted. This will take a lot of time. In addition, when the basic figure based on the line and the priority figure based on the polygon overlap each other, even if a closed polygon is formed by a part of the line and the polygon, only the line passing through the polygon area is used. Cannot be deleted. An object of the present invention is to quickly search for a basic figure overlapping with a priority figure when displaying a basic figure and a priority figure set by vector graphic information, and to search only a part of the basic figure that overlaps with the priority figure. It is an object of the present invention to provide a graphic processing method and apparatus capable of surely erasing. [Means for Solving the Problems] In order to achieve the above object, the present invention manages facility drawings including a priority figure having a cut-out area and a basic figure as vector image information, and displays the facility drawings on a display device. The display screen of the display device is divided into a plurality of cells, and when the priority graphic and the basic graphic are displayed on the display device, a cell including the priority graphic is calculated. If the cell contains a basic figure, the cell containing the basic figure is determined as an intersection calculation candidate, and the intersection calculation between the priority figure and the basic figure is performed for the cell of the intersection calculation candidate, and the priority figure is obtained by this intersection calculation. And determining whether the basic graphic intersects with the basic graphic. When the priority graphic intersects with the basic graphic, the basic graphic in the overlapping area overlapping the cut-out area of the priority graphic is erased. It adopts a processing method. In adopting the graphic processing method, the following elements can be added. (1) Obtaining a cell containing a priority figure by calculation based on coordinates. (2) The priority graphic is a symbol graphic. (3) The priority graphic is a graphic including a character in the cutout area. Further, the present invention manages a facility drawing including a priority figure and a basic figure having a cutout area as vector image information, and displays the facility drawing on a display device,
A file device that stores the image information of the priority graphic and the image information of the basic graphic in association with the cell when the display screen of the display device is divided into a plurality of cells; When displaying a figure, a cell containing the priority figure is calculated, and if the cell contains a basic figure, the cell containing the basic figure is determined as an intersection calculation candidate, and priority is given to the intersection calculation candidate cell. When the intersection calculation between the figure and the basic figure is performed, it is determined whether or not the priority figure and the basic figure intersect based on the calculation of the intersection, and a determination result that the priority figure and the basic figure intersect is obtained. And an arithmetic processing device for erasing a basic graphic in an overlapping area overlapping with a cut-out area of a priority graphic. In configuring the graphic processing apparatus, the following elements can be added. (1) The arithmetic processing unit obtains a cell containing a priority figure by calculation based on coordinates. (2) The priority graphic is a symbol graphic. (3) The priority graphic is a graphic including a character in the cutout area. [Operation] According to the above-described means, when displaying a priority graphic and a basic graphic on a display device based on image information, a cell including the priority graphic is calculated, and only when the cell includes the basic graphic, Since this cell is determined as an intersection calculation candidate cell, it is necessary to search for all basic figures by using the cell containing the priority figure as a search key when extracting the basic figure overlapping the priority figure Is eliminated, and a basic figure to be subjected to intersection calculation can be quickly extracted, which can contribute to speeding up of processing. When the priority figure and the basic figure intersect, the basic figure in the overlapping area overlapping with the cut-out area of the priority figure is deleted. Can be reliably erased. Embodiment An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 shows an example of the configuration of a system for carrying out the present invention. In the figure, reference numeral 201 denotes a CPU for executing processing, 202 denotes a file device for storing map and drawing data, and 203 denotes editing and searching. Main memory for storing programs for executing various processes such as processing, data being processed and data output to electrostatic plotter and XY plotter, 204 is a keyboard for inputting commands and parameters for the operator to give operation instructions An input device 205 such as a mouse; a CRT 205 for displaying a drawing or a processing result; and 206 an external medium such as an MXT for storing data to be output to an electrostatic plotter, an XY plotter, or the like. FIGS. 3 (a) and 3 (b) show examples of output when the present invention is applied to an electrostatic plotter, an XY plotter, etc., which do not have an output graphic priority function, taking a water distribution pipe diagram as an example. Reference numeral 101 denotes a symbol figure such as a valve which has a higher priority on output. Reference numeral 102 denotes a line figure such as a pipe line to be hidden by the symbol figure 101. The priority figure of the symbol figure 101 has area information to be hidden, and the intersection of this figure and the basic figure of the line figure 102 is calculated, and the basic figure like the line figures 103 and 104 shown in FIG. Split. By doing so, the output drawing can be represented in a form in which a line figure 102 such as a pipe is divided by a symbol figure 101 such as a valve. FIG. 1 shows an embodiment of the graphic processing procedure of the present invention.
First, a priority figure such as a valve, which is the symbol figure 101, is registered in an output table in the main memory (STEP 1. (a)).
Next, a basic figure candidate which is a line figure 102 intersecting each priority figure unit is searched (STEP 2. (b)). Symbol shapes
The intersection between the cut-out area of the priority figure 101 and the line segment of the basic figure of the line figure 102 which has become the intersection candidate is determined (STEP 3.
(C)), the corresponding line segment is divided into line figures 103 and 104 (STEP 4 (d)). Since the divided basic figure may intersect with another priority figure, it is registered in the figure table again (STEP 5). After performing the vector superposition priority processing for all the priority figures, the basic figures are registered in the output table from the figure table. FIGS. 4 (a), (b) and (c) show an example of a method for searching for a basic figure which is a candidate to intersect with a priority figure. Several methods of searching for a specific graphic from the graphic definition area 401 at high speed have been considered. In this example, the graphic definition area 401 is divided into arbitrary grids (cells), and the graphic data contained therein is divided into cells. The method of storing the information in the cell unit graphic information table 403 will be described as an example. FIG. 4A shows the relationship between the graphic definition area 401 and the cells, and FIG. 4B shows a predetermined cell in an enlarged manner.
In FIG. 4C, reference numeral 404 denotes a basic graphic data table.
The result of editing the basic graphic data as graphic information in cell units is stored in the cell-based graphic information table 403. The cell-based graphic information table 403 and the basic graphic data table 404 are used in the main memory 20 shown in FIG.
Remember in 3. As shown in STEP 2 of FIG. 1, a cell coordinate value 402 is calculated from the arrangement center coordinates of the priority graphic, graphic information existing in the corresponding cell is obtained from the cell unit graphic information table 403, and the priority of the symbol graphic 101 is obtained. After the intersection with the graphic is determined, line segment information that intersects with the pointer on the basic graphic table 404 of the basic graphic data of the line graphic 102 that is an intersection candidate is obtained. In this way, it is possible to perform a high-speed candidate search for the line figure 102 that is the basic figure that intersects the symbol figure 101 that is the priority figure. That is, when the basic graphic (line graphic 102) intersects the priority graphic (symbol graphic 101), the priority graphic (position coordinates of the priority graphic) and the basic graphic position information (cell coordinate value 402) are used to determine the priority graphic. Is selected, the graphic information (basic graphic data table 404) of the basic graphic is searched according to the pointers of the selected cell (pointer 1 to pointer 3...), And graphic information (linear information X ₁ , Y ₁ …)) Because it is extracted, it is not necessary to search all the graphic information to extract the graphic information of the basic figure that intersects the priority figure.
Processing for deleting a line graphic belonging to an overlapping area with a priority graphic among basic graphics can be quickly performed, which can contribute to speeding up of the processing. FIG. 5 shows an example of the overlay priority processing. Priority figures the symbol graphic 101, and a line segment A ₁ -A ₄ and segment region of the priority figure basic figure became intersection candidate line figure 102 has the cut-out area information corresponding to the inclination The intersection points A ₂ (Xi, Yi) and A ₃ (Xi + 1, Yi + 1) are obtained, and the line segment A ₁ −A ₄ is divided into line segments A ₁ −A ₂ and A ₃ −A ₄ . The line segment A ₂ -A ₃ shown by the broken line becomes a cut-out portion (unnecessary portion) and is hidden when output to an electrostatic plotter, an XY plotter or the like. FIG. 6 shows an example of a table configuration of a priority graphic and a basic graphic. In the priority graphic configuration shown in 601, the pattern information of the symbols to be output, the arrangement center coordinates, the inclination, and the cutout area information for performing the cutout are shown. In the basic graphic configuration shown in FIG. 602, the constituent points of the broken line are sequentially provided in a two-dimensional coordinate sequence from the starting point side, and as shown in FIG. 5, the line segment (Xn, Y
n)-When divided on (Xn ⁺ ₁ , Yn ⁺ ₁ ), it is corrected to two broken line information at the intersection (Xi-Yi) and (Xi ⁺ ₁ , Yi ⁺ ₁ ) with the priority figure It shows that. With the above configuration, it is possible to quickly and easily create output data that has been subjected to overlay priority processing for an electrostatic plotter and an XY plotter that do not have an output graphic priority function. FIG. 7 shows a case where a character graphic is set as a priority graphic. By providing each of the cutout areas 701 and 702 for each character string graphic unit, the basic graphic 703 can be hidden in the same manner as described above. [Effects of the Invention] As described above, according to the present invention, when displaying a priority graphic and a basic graphic on a display device based on image information, a cell including the priority graphic is calculated, and the basic This cell is determined as an intersection calculation candidate cell only when a figure is included, so when extracting a basic figure that overlaps with a priority figure, the cell containing the priority figure is used as a search key. Therefore, it is not necessary to search for the basic figure, and the basic figure to be subjected to the intersection calculation can be quickly extracted, which can contribute to speeding up the processing.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a vector superposition priority processing procedure, FIG. 2 is an example of a system configuration, FIG. 3 is an output example of a graphic subjected to superposition priority processing, and FIG. FIG. 5 shows an example of a search for a basic figure which is a candidate for intersection, FIG. 5 shows an example of priority processing for superposition, FIG.
FIG. 7 is an explanatory diagram showing an example in which a character is set as a priority graphic. 101 ... symbol figure, 102 ... line figure, 103 ... divided figure, 104
... Divided figure, 201 ... CPU, 202 ... File device, 203 ... Main memory, 204 ... Input device, 205 ... Graphic display, 206 ... External medium, 401 ... Graph definition area, 402 ... Cell coordinate value, 403 ... Cell unit figure Information table, 404: graphic data table, 601: priority graphic configuration, 602: basic graphic configuration, 701: cutout area, 702: cutout area, 703: basic figure.

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Mikio Yoda 5-2-1 Omikacho, Hitachi City Inside the Omika Plant, Hitachi, Ltd. (56) References JP-A-60-239825 (JP, A) 54-161839 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) G06F 7/50

Claims (1)

(57) [Claims] A facility drawing including a priority figure having a cut-out area and a basic figure is managed as vector image information, and the facility drawing is displayed on a display device.The display screen of the display device is divided into a plurality of cells. When displaying the priority graphic and the basic graphic on the display device, a cell including the priority graphic is calculated, and if the cell includes the basic graphic, a cell including the basic graphic is determined as an intersection calculation candidate. Is determined, and the intersection of the priority figure and the basic figure is executed for the intersection calculation candidate cell, and it is determined whether or not the priority figure and the basic figure intersect by this intersection calculation. A graphic processing method characterized by erasing a basic graphic in an overlapping area overlapping with a cut-out area of a priority graphic when intersecting. 2. 2. The graphic processing method according to claim 1, wherein the cell containing the priority graphic is obtained by calculation based on coordinates. 3. 2. The graphic processing method according to claim 1, wherein the priority graphic is a symbol graphic. 4. 2. The graphic processing method according to claim 1, wherein the priority graphic is a graphic including a character in a cut-out area. 5. A facility drawing including a priority figure and a basic figure having a cutout area is managed as vector image information, and the facility drawing is displayed on a display device, and a display screen of the display device is divided into a plurality of cells. A file device for storing the image information of the priority graphic and the image information of the basic graphic in association with the cell at the time of the operation, and a cell including the priority graphic when the priority graphic and the basic graphic are displayed on the display screen of the display device. When the cell includes the basic figure, the cell including the basic figure is determined as an intersection calculation candidate, and the intersection calculation between the priority figure and the basic figure is performed for the intersection calculation candidate cell. Based on the intersection calculation, it is determined whether the priority figure and the basic figure intersect, and when the determination result that the priority figure and the basic figure intersect is obtained, the priority figure overlaps with the cutout area of the priority figure. It and a processing unit for erasing the basic shapes of the overlap region graphics processing apparatus according to claim. 6. 6. The graphic processing device according to claim 5, wherein the arithmetic processing device obtains a cell including the priority graphic by calculation based on coordinates. 7. 6. The graphic processing device according to claim 5, wherein the priority graphic is a symbol graphic. 8. 6. The graphic processing apparatus according to claim 5, wherein the priority graphic is a graphic including a character in a cut-out area.