JPH04309188A - Computer graphic processing system - Google Patents

Abstract

PURPOSE:To obtain the excellent computer graphic processing system which can generate a line segment attached a line type with the high degree of freedom at high speed. CONSTITUTION:A line type preparing function 1 is provided to prepare the line type, a recording means is provided with a line type table 2 to register the line type prepared by this line type preparing means 1, a real line data calculating function 3 is provided to calculate a coordinate value for generating the line segment completely with intergers without multiplication and division, and a line type reflecting function 4 is provided to generate the line segment while reflecting the line type, which is registered on the line type table 2, upon real line data calculated by the real line data calculating function 3.

Description

[Detailed description of the invention]

[Purpose of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a computer graphic processing system for designing mechanical, electronic, architectural, etc. systems.

0002

2. Description of the Related Art Conventionally, in computer graphic processing systems, line segments are generated on a CRT display by not only solid line segments but also several line types formed by appropriately combining strands and gaps. Processing that generates line segments is possible. Such line segment generation processing with line types is performed by a hardware function of the display device. In other words, when generating a line segment with a line type, it is necessary to select a single line type from among the specific line types registered in advance in the hardware of the display device, and to select the starting point and end point of the line segment. A line segment with a desired line type is generated by specifying the line segment. In this case, to select a line type, for example, a line segment of a predetermined length that displays a specific number of registered line types, or an identification number, etc. is displayed on the display, and then one of the line types is displayed. Operations such as specifying line types are performed.

0003

However, in general, line segment generation processing with line types based on the hardware functions of a display device can only generate a specific line type unique to the display device. In addition, problems such as poor balance of line types with respect to the overall length of line segments tend to occur, and generation of line segments is subject to significant restrictions, causing a reduction in the degree of freedom of the system. Therefore, it is required to generate line segments with line types without being restricted by the line type generation function of the display device.

The present invention was proposed to solve the problems of the prior art, and its purpose is to generate line segments with line types with a high degree of freedom at high speed. It is an object of the present invention to provide an excellent computer graphics processing system. [Structure of the invention]

[0005]

[Means for Solving the Problems] A computer graphics processing system according to the present invention includes a line type creation means for creating line types, and a recording means including a line type table for registering the line types created by the line type creation means. , a solid line data calculation means that calculates coordinate values for line segment generation using all integers and without multiplication and division, and a solid line data calculation means that reflects the line types registered in the line type table in the solid line data calculated by the solid line data calculation means. It is characterized by having a line type reflecting means for generating line segments.

In this case, as a concrete solid line data calculation means, DDA (digital differential
A solid line data calculation means using an al analyzer) is used. FIG. 1 is a basic functional block diagram of a computer graphics processing system according to the present invention, in which 1 is a line type creation function (line type creation means), 2 is a line type table, and 3 is a system using DDA. 4 is a solid line data calculation function (solid line data calculation means) and a line type reflection function (line type reflection means).

[0007]

[Operation] In the computer graphics processing system of the present invention having the above configuration, the line type creation function (line type creation means) 1 freely creates an appropriate number of desired line types, and can be registered in the line type table 2. When creating a line segment with a line type, the solid line data calculation function (solid line data calculation means) 3 calculates solid line data for the desired line segment, and the line type reflection function (line type reflection means)
4, a certain desired line type can be reflected in the solid line data of a desired line segment, and a line segment with a desired line type can be generated at high speed.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the computer graphics processing system according to the present invention will be specifically described below with reference to FIGS. 2 to 7.

FIG. 2 is a functional block diagram specifically showing one embodiment of the present invention. In FIG. 2, 5 to 7 are part of commands input to the graphic processing program, and 5 is a line type. A creation command, 6 a line type selection command, and 7 a line segment generation command. These instructions 5 to 7 are inputted by the input device 8 of the computer and sent to the CPU 9. The CPU 9 is a device that performs computation and control on the computer, and its output results are sent to the graphic display 10 and displayed. Reference numeral 11 in the figure is a graphic processing program, and this graphic processing program 11 includes various means related to the present invention, namely, a line type creation means 12, a line type number setting means 13, a solid line data calculation means 14, a line type Reflection means 15,
A line segment display means 16 is included. In this case, the solid line data calculation means 14 is a means using a calculation mechanism DDA based on Bresenham's algorithm. 17~ in the figure
20 is arranged on the memory (recording means) in the graphic processing program 11, and is used for data reference and storage (registration).
17 is a line type dot pattern table, 18 is a selected line type number table, 19 is generated line segment solid line dot data, and 20 is generated line segment dot data.

3 to 5 are flowcharts respectively showing the line type creation operation procedure, line type selection operation procedure, and line segment generation operation procedure in the system of FIG. Corresponds to a functional block. Hereinafter, the operating procedure in the system of FIG. 2 will be explained along the flowcharts of FIGS. 3 to 5.

First, in the system shown in FIG. 2, when a line type creation command 5 including line type number data and line type shape data to be newly created is input through the input device 8, the line type is created as shown in FIG. The number data and line type shape data are passed to the graphic processing program 11.
The line type creation operation starts. That is, in the graphic processing program 11, new line type dot pattern data is created by the line type creation means 12 based on the input line type shape data. This newly created line type dot pattern data is stored in the line type dot pattern table 17 together with the input line type number data.

Further, in the system shown in FIG. 2, when a line type selection command 6 including line type number data is input through the input device 8, the line type number data is sent to the graphic processing program 11 as shown in FIG. Passed and graphics processing program 1
1 line type selection operation is started. That is, the input line type number data is set as selected line type number data by the line type number setting means 13 in this graphic processing program 11, and is stored in the selected line type number table 18.

Furthermore, in the system shown in FIG. 2, when a line segment generation command 7 containing coordinate value data of the starting point and ending point of the line segment to be generated is inputted through the input device 8, as shown in FIG. , the start point/end point data are passed to the graphic processing program 11, and the line segment generation operation of the graphic processing program 11 is started. That is, in the graphic processing program 11, first, generated line segment solid line dot data 19 is created by the solid line data calculation means 14 using the arithmetic mechanism DDA based on Bresenham's algorithm based on input start point and end point data. Ru. FIG. 6 is an explanatory diagram showing an example of such generated line segment solid line dot data 19, where 21 is a line segment and 22 is dot data.

Next, the selected line type number table 18 in which already selected line type number data is stored is referred to.
The line type dot pattern table 17 is searched for line type dot pattern data corresponding to the selected line type number data. When the target line type dot pattern data is detected, this line type dot pattern data is reflected on the generated line segment solid line dot data 19 created in the previous step by the line type reflecting means 15, and the generated line segment dot Data 20 is created.

In this case, the line type reflecting means 15 makes some of the constituent elements of the line type dot pattern variable elements, calculates the balance of the line type with respect to the length of the entire line segment, and adjusts the dimensions of the variable elements to the balance. After determining accordingly, generated line segment dot data 20 is created. For example, FIG. 7 shows a line type dot pattern in which one set includes one long strand (long line), two short strands (short line), and three gaps. For such a line type dot pattern, the line type reflecting means 15 sets a long element line (long line) as a variable element within a certain range, sets other elements as fixed elements, and changes the length of the entire line segment. After appropriately determining the dimensions of the long strands (long lines), generated line segment dot data 20 is created. Then, generated line segment dot data 20 created in this way
is finally displayed on the graphic display 10 by the line segment display means 16.

As described above, in this embodiment, the line type creation means 12 can create the line type desired by the user. In particular, in addition to the fact that the solid line data calculation means 14 using DDA performs calculations using all integers and without multiplication/division, the reference selection line type number table 18
, line type dot pattern table 17, generated line segment solid line dot data 19, and generated line segment dot data 20 are all arranged in the memory, so data can be created and displayed at high speed. Furthermore, the line type reflecting means 15
As a result, variable elements of the line type are determined according to the length of the entire line segment, and the line type is appropriately reflected, so that well-balanced line segment data can be created.

It should be noted that the present invention is not limited to the above-mentioned embodiment, and the specific graphic processing program and flowchart can be freely changed, and the hardware to be used can be freely selected. That is, since the present invention relates to the basic components of a computer graphic processing system, the present invention relates to a system having a line type creation means, a recording means including a line type table, a solid line data calculation means, and a line type reflecting means. As long as this is the case, the specific structure can be freely changed, and the same excellent effects as in the embodiments described above can be obtained.

[0018]

[Effects of the Invention] As described above, in the present invention,
By using a line type creation means, a recording means including a line type table, a solid line data calculation means, and a line type reflection means, line segments with line types can be created at high speed with a much higher degree of freedom than in the past. It is possible to provide an excellent computer graphics processing system that can generate data.

[Brief explanation of drawings]

FIG. 1 is a basic functional block diagram of a computer graphics processing system according to the present invention.

FIG. 2 is a functional block diagram showing an embodiment of a computer graphics processing system according to the present invention.

FIG. 3 is a flowchart showing a line type creation operation procedure in the system of FIG. 2;

FIG. 4 is a flowchart showing a line type selection operation procedure in the system of FIG. 2;

FIG. 5 is a flowchart showing a line segment generation operation procedure in the system of FIG. 2;

FIG. 6 is an explanatory diagram showing an example of generated line segment solid line dot data created by the solid line data calculation means of the system in FIG. 2;

FIG. 7 is an explanatory diagram showing an example of a line type dot pattern created by the line type creation means of the system in FIG. 2;

[Explanation of symbols]

1 Line type creation function 2 Line type table 3 Solid line data calculation function 4 Line type reflection function 8 Input device 9 CPU 10 Graphic display 11 Graphic processing program 12 Line type creation means 13 Line type number setting means 14 Solid line data calculation means 15 Line type Reflection means 16 Line segment display means 17 Line type dot pattern table 18
Selected line type number table 19 Generated line segment solid line dot data 20 Generated line segment dot data

Claims (1)

[Claims] Claim 1: A line type creation means for creating line types, a recording means including a line type table for registering the line types created by this line type creation means, and coordinate value calculation for line segment generation. A solid line data calculation means that uses integers and does not require multiplication or division; and a line type reflection means that generates line segments by reflecting the line type registered in the line type table on the solid line data calculated by the solid line data calculation means. A computer graphics processing system featuring: