JPH10162163A - Superposing display method for graphic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the operability of superposing drawing input by performing hidden-line processing in real time. SOLUTION: Information regarding the priority display order of a drawing unit, which is newly inputted, is stored (S202) and it is judged in real time whether or not the new drawing unit, which is being inputted, has superposed relation with a display drawing unit that is already displayed on the said screen on the screen (S206), and when those new drawing unit and displayed drawing unit have the superposed relation, the priority display order of the new drawing unit and the priority display order of the displayed drawing unit are referred to and compared with each other (S210). Then, a hidden-line processing is performed for the drawing unit with lower priority display order (S306 and S308) and if the superposed relation disappears during the input of the drawing unit (S310), control is so performed that the hidden-line processing is stopped in real time (S212).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for superimposing and displaying figures, and more particularly to a method for superimposing and displaying drawing vector data such as line figures and symbol figures on a screen.

[0002]

2. Description of the Related Art Conventionally, in a drawing program such as CAD, data definition is easy and data size can be reduced. Therefore, drawing units such as diagrams, symbols, and characters are defined by drawing vector data and managed. doing. Using such drawing vector data, create and display drawings that are developed three-dimensionally, such as ducts and pipes,
When drawing units such as line diagrams, symbols, and characters are displayed in an overlapping manner, all the line drawings are simultaneously displayed on the same screen as shown in FIG. 5A. Therefore, the screen is very difficult to see, and the positional relationship between the drawing units is difficult to understand. Therefore, there is a high possibility that a drawing error or the like occurs, which is a problem.

[0003] Conventionally, priority is given to drawing units in advance in the drawing unit, and in a portion where drawing units overlap, a drawing unit having a lower priority display order is hidden below a drawing unit having a higher priority display order, or a dotted line is used. Image processing such as display, so-called hidden line processing, is performed to make the superimposed display screen visually easy to understand. For example, in the case of a drawing developed three-dimensionally, as shown in FIG. 5 (b), priority display order is assigned according to the height level, and pipes arranged at a lower level are arranged at a higher level. Was displayed so that it could be hidden under the piping.

[0004]

However, in the conventional hidden line processing, as shown in FIG. 5A, drawing units having different priority display orders are drawn while being overlapped once, and then the hidden line processing is performed collectively. In this case, the drawing unit is displayed in accordance with the priority display order. Therefore, during drawing, it is not possible to visually know the priority display order of the drawing units, so that the probability that a drawing error will occur is still high. Further, even if the priority display order is an equivalent drawing unit, overlapping drawing is possible, which may cause a design error that a design drawing that cannot be actually constructed can be drawn.

Further, in the conventional method, since the hidden line processing is performed collectively, it may take a long time to perform the processing, and even if a drawing error is found after the collective processing, it takes time to correct it. Was. Furthermore, even if the hidden line processing is performed, since the processing is performed collectively, it is not easy to find an erroneous input such as a drawing error on the screen on which the hidden line processing has been performed.

Further, in the conventional method, since the hidden line processing is performed collectively, the number of combinations of all figures is generated in order to determine the vertical relationship between a plurality of figures with respect to all the figures on the drawing. There is a problem that time is increased and the collective hidden line requires time.

Accordingly, the present invention has been made in view of the above-described problems of the conventional hidden line processing, and performs a hidden line processing in real time during drawing to thereby provide a drawing screen. A new and improved superimposed image display method and its control program that can reduce drawing errors and design errors by making it easier to see and visually displaying various design items on the screen in real time Its purpose is to provide recorded media.

[0008]

According to a first aspect of the present invention, there is provided a method for superimposing and displaying two or more drawing units on a screen of an image display device. Provided. According to the first aspect of the present invention, when a new drawing unit is inputted, information relating to the priority display order of the drawing unit is designated and stored, and the drawing unit is newly inputted and displayed on the screen. And a step of determining in real time whether or not the new drawing unit being input and the already displayed drawing unit already displayed on the screen are superimposed on each other in real time. When there is a superimposition relationship between the already displayed drawing units, a step of referencing and comparing the priority display order of the new drawing unit and the priority display order of the already displayed drawing units, and the result of the reference comparison, the priority display order It is characterized by comprising a step of performing hidden line processing on a drawing unit having a low resolution in real time, and a step of stopping the hidden line processing in real time when the superimposition relationship is resolved during input of the drawing unit.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
A method for superimposing a graphic according to the present invention and a medium storing a control program for causing a computer to execute the method for superimposing the graphic will be described in detail.

First, the system configuration of an apparatus 100 according to the present invention will be schematically described with reference to FIG. 1. 102 is a display device such as a CRT.
Drawing vector data such as diagrams, symbols, and characters are displayed on the screen of the display device (in this specification, drawing vector data that can be grouped such as diagrams, symbols, and characters will be referred to as drawing units. )) Is displayed. Reference numeral 104 denotes an input device such as a mouse or a keyboard. The operator operates the input device 104 to draw desired drawing units such as diagrams, symbols, and characters while viewing the screen 102. Reference numeral 106 denotes a storage device. For example, the RAM unit can temporarily store drawing vector data being processed, and the ROM unit stores the control according to the present embodiment. It is possible to store programs and the like. 108 is
It is a central processing unit (however, includes a calculation unit and a control unit), and performs calculation and control related to the image superimposition procedure according to the present embodiment. Reference numeral 110 denotes a large-capacity storage device that stores files related to various image data such as CAD data.

Next, a method of superimposing and displaying the drawings according to the present embodiment will be described with reference to FIGS.
2 and 3 show flowcharts of a method of superimposing a drawing according to the present embodiment, and FIG.
A duct symbol 402 which is a drawing unit previously drawn using the drawing superimposing method according to the present embodiment is used.
Duct symbol 40 as a new drawing unit superimposed on
4 is shown. In FIG. 4, the height level of the already displayed duct symbol 402 is 3
600 mm, newly created duct symbol 404
Has a height level of 2500 mm.

First, when a new drawing unit is drawn,
Display order information of the drawing unit (for example, H = 2500 m
m) is specified (S202). Next, as shown in FIG.
By dragging, drawing of a new drawing unit is started (S204). At this time, the control program monitors whether the new drawing unit (duct symbol 404) overlaps the already displayed drawing unit (duct symbol 402) (S206). Unless a superimposition relationship occurs between the two, the newly drawn duct symbol 40
4 is displayed as it is (S208). On the other hand, when a superposition relationship occurs between the new drawing unit (duct symbol 404) and the already displayed drawing unit (duct symbol 402), the control program refers to the display order information of both. (S210). In the example shown in FIG. 4, since the height level of the new drawing unit is 2500 mm and the height level of the already displayed drawing unit is 3600 mm, it can be seen that the displayed order of the already displayed drawing unit is higher than that of the new drawing unit. .

As a result of the reference comparison in step S210, when it is determined that the display order of the newly displayed drawing unit is lower than the display order of the already displayed drawing unit (S302), FIG.
As shown in (b), the drawing unit currently being drawn is hidden-line processed in real time from the boundary where both drawing units intersect, and displayed under the already displayed drawing unit (S304). On the other hand, as a result of the reference comparison in step S210, when it is determined that the display order of the new display drawing unit is higher than the display order of the already displayed drawing unit (S302), the example shown in FIG. Conversely, the already displayed drawing unit is hidden in real time from the boundary where the two drawing units intersect, and hidden under the currently drawn drawing unit and displayed (S306). In this way, by performing the hidden line processing in real time, the operator can visually grasp the positional relationship between the currently drawn drawing unit and the already displayed drawing unit, thereby improving the convenience of drawing. This makes it possible to reduce the probability that a drawing error or a design error occurs.

Further, the drawing of the new drawing unit is continued (S3
10) As a result, as shown in FIG. 4C, when the superimposition relationship between the new drawing unit and the already displayed drawing unit ends, the hidden line processing ends (S312), and the new drawing unit or the already displayed unit is displayed. Among the drawing units, the hidden drawing units are displayed as usual. Of course, while the superimposition relation is not terminated (including a case where a new superposition relation is generated with another already displayed drawing unit even if the current superposition relation is terminated), the process returns to step S210, and the superposition relation is changed. The display order of certain rendering units is compared, and the hidden line processing is continued.

As described above, according to the present embodiment, even in the case of performing a three-dimensional development such as the design of ducts and pipes, hidden line processing can be performed in real time during drawing. Since it is performed, the positional relationship such as the height relationship can be easily grasped visually, so that the operability by the operator can be improved, and the probability of drawing errors and design errors can be reduced. .

As described above, an example of the method of superimposing the drawings according to the present embodiment has been described with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious for those skilled in the art to arrive at various changes and modifications within the scope of the technical idea described in the claims, and these also belong to the technical scope of the present invention. I understand.

For example, in the above example, the case where two drawing units overlap was described as an example. However, the present invention is not limited to such an example. For example, on a screen where two or more drawing units are superimposed and displayed. This is naturally applied to the case where another drawing unit is superimposed and displayed. In such a case, the display order of all the drawing units is referred to and compared, and the hidden line processing is sequentially performed in descending order of the display order.

In the above example, the case where the display order of the drawing units to be superimposed and displayed is different has been described as an example. However, the present invention is not limited to this example. That is, the present invention can be applied to a case where drawing units interfere with each other. If they interfere with each other in this way, even if they can be created on the drawing,
Since actual construction cannot be performed, a warning is displayed to the operator when an interference relationship occurs, or the display method of the drawing unit in the interference relationship is changed to call attention to the operator. It is possible to configure.

Further, in the above embodiment, the program for performing the method for superimposing and displaying the drawing vector data such as the line figure and the symbol figure on the screen is stored in the storage device 10.
6 is stored in the ROM, but the present invention is not limited to such an example.
It is possible to record on various recording media, for example, an optical storage device such as a hard disk, a floppy disk, and a CD-ROM, and a high-density storage device utilizing various physical phenomena. It is to be understood that this naturally belongs to the technical scope of the present invention.

[0020]

As described above, according to the present invention,
Even when drawing vector data such as diagrams, symbols, and characters are superimposed on the screen, hidden line processing is performed in real time during drawing by the operator. It is possible to easily grasp the positional relationship between the drawing unit and the drawing unit, and to improve the operability of the drawing device such as CAD, and to prevent the occurrence of drawing mistakes and design mistakes. It is possible to do.

Further, in the conventional method, since the hidden line processing is collectively performed, the number of combinations of all the figures is generated in order to determine the vertical relationship between a plurality of figures with respect to all the figures on the drawing. Although the time has increased and the collective hidden line has taken a long time, according to the present invention, the figure to be subjected to the hidden line processing is limited to the figure area currently being drawn. Since it becomes unnecessary and the hidden line / interference processing can be performed in real time, a highly reliable drawing can be created.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating a schematic system for executing a method of superimposing a drawing according to the present invention;

FIG. 2 is a flowchart showing a hidden line processing procedure according to the present invention.

FIG. 3 is a flowchart showing a hidden line processing procedure according to the present invention.

FIG. 4 is an explanatory diagram showing a relationship between a previously displayed drawing unit and a newly created drawing unit on which hidden line processing according to the present invention is performed.

FIG. 5 is an explanatory diagram showing a conventional hidden line processing procedure.

[Explanation of symbols]

 102 display device 104 input device 106 storage device 108 central processing unit 110 mass storage device

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yasuhiro Soga 4-85, Shizuma-cho, Higashi-ku, Nagoya, Aichi Prefecture Inside Daitech Co., Ltd. Inside DAITECH

Claims (1)

[Claims] 1. A method for superimposing a graphic in which two or more drawing units are superimposed on a screen of an image display device: when a new drawing unit is newly input, information on a priority display order of the drawing unit is designated. A new drawing unit is input and displayed on the screen; and the new drawing unit being input and the already displayed drawing unit already displayed on the screen are mutually displayed on the screen. Determining in real time whether or not there is a superimposition relationship; if a superimposition relationship exists between the new drawing unit and the already displayed drawing unit, the priority display order of the new drawing unit and the priority of the already displayed drawing unit A step of referring to each of the display orders and comparing them; a step of performing a hidden line process on a drawing unit having a lower priority display order in real time as a result of the reference comparison; and a case where the superimposition relationship is resolved during the input of the drawing units. The shade in real time Stopping the line processing.