JPH02148372A - System for converting segment having width - Google Patents

Abstract

PURPOSE:To represent the with of a segment and, at the same time, to improve the processing speed when a segment having the width is converted by outputting a device- independent controlling instruction for drawing segment to a graphic outputting device after converting the instruction into a device-dependent controlling instruction for drawing graphics. CONSTITUTION:Device-independent controlling instruction strings for drawing graphics which are to be converted into device-dependent controlling instruction strings for drawing graphics are stored in a storage mans 1. A conversion processing means 2 successively converts the instructions in the means 1 into the device-dependent controlling instruction strings for drawing graphics by taking out the instructions from the means 1 one by one. When the means 2 detects a controlling instruction string for drawing segment during the course of the conversion, necessary information is delivered to a means 3 for processing conversion of controlling instructions for drawing segments through a register 5. The means 3 converts the device-independent controlling instruction string for drawing segment into a device-dependent controlling instruction string for drawing segment or square and returns the converted instruction to the means 2. The means 2 sends the converted device-dependent controlling instruction string for drawing graphics to a graphic output device 4 when the conversion is completed on all controlling instruction strings for drawing graphics.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention provides a graphic drawing system that converts a device-independent graphic drawing control command string into a device-dependent graphic drawing control command string and outputs the converted graphic drawing control command string to a graphic output device. The present invention relates to a conversion method for a drawing control command sequence, and particularly to a conversion method for a line segment having a line width.

(Prior art) Conventionally, the first conversion method for line segments with this basic line @ has been used for device-dependent line segment drawing when the graphic output device does not have a function to fully expand lines @. The control commands are shifted one dot at a time and the number of dots equal to the line width is output. Although the line width can be expressed by performing such conversion, the second conversion method ignores the line width and performs a conversion that always outputs a line width of one dot.

(Problem to be Solved by the Invention) The conventional method for converting line segments with line drawings described above is to output only the number of line segments whose width is equal to the line width, or to always output line segments with a width equal to the line width. A line segment was output using line 1 of 1 dot. Therefore, in the former case, when converting a device-independent line segment drawing control instruction string into a device-dependent line segment drawing control instruction string, the amount of conversion increases by the amount of line length, and the processing speed increases accordingly. It has the disadvantage that it can be a matter of luck.

In the latter case, a line segment is always output on the screen of the graphic output device with a line width of one dot, and there is a drawback that the line width cannot be expressed.

The purpose of the present invention is to express the line width when converting a line segment with a line width, and to improve the processing speed. By converting the control commands into graphic drawing control commands and outputting them to a graphic output device, the above-mentioned drawbacks are eliminated, and we provide a complete conversion method for pure parts that has a line drawing configured to accurately represent the entire line #A. be.

(Means for Solving the Problem) The method of converting a line segment having a line @ according to the present invention includes a storage means,
a conversion processing means, a line segment drawing control command conversion processing means,
It is convenient to have a graphic output device.

The storage means is for storing a device-independent sequence of graphic drawing control commands to be converted.

The conversion processing means is for converting a device-independent figure drawing control instruction string into a device-dependent figure drawing control instruction string. In this case, the conversion processing means, along with the line segment drawing control sound@conversion processing means, causes the line drawing to be 2 dots (pixels).
The above line segment drawing control command executes a process of converting not a line segment but a polygon such as a quadrilateral.

The line segment drawing control command conversion processing means is for converting a device-independent line segment drawing control command, which is constituted by the conversion processing means, into a figure drawing control command that is device dependent.

The line segment drawing control command conversion processing means, together with the conversion processing means, executes processing for converting line segment drawing control commands having a line width of 2 bits (pixels) or more into polygons such as rectangles instead of line segments. It is something.

(Example) Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram illustrating an implementation 13'llk of a method for converting line segments having a line width of 100% according to the present invention. In FIG. 1, 1 is a storage means, 2 is a conversion processing means, 3 is a line segment drawing control command conversion processing means, 4 is a graphic output device, and 5 is a register.

In FIG. 1, a storage means 1 is set, for example, on a core memory, and stores a device-independent graphic drawing control instruction string to be converted into a device-dependent graphic drawing control instruction string.

The conversion processing means 2 extracts one instruction at a time from the graphic drawing control command string stored in the storage means 1, and converts it into a device-dependent graphic drawing control command string. When a line segment drawing control command is detected, the necessary information is passed to the line segment drawing control command conversion processing means 3 through a register 5. Based on this information, the line segment drawing control command conversion processing means 3
The independent line segment drawing control commands are converted into device-dependent line segment drawing control commands and rectangle drawing control commands, and these are returned to the conversion processing means 2.

The conversion processing means 2 sends the converted device-dependent graphic drawing control command sequence to the graphic output device 4 when all the graphic drawing control command conversion processing is completed. The graphic output device 4 is constituted by, for example, a CRT, and decodes and displays the device-dependent graphic drawing control command string received from the conversion processing means 2.

The above is an outline of the operation of this embodiment. Next, an example of the processing flow of the conversion processing means 2 is shown in FIG. An example of the processing flow of the line segment drawing control command conversion processing means 3 is shown in the third example.
As shown in the figure. The operation of this embodiment will be explained in more detail with reference to the flowcharts of FIGS. 2 and 3.

As shown in FIG. 4, the storage means 1 contains a line width control command having the width of a line segment, a line segment drawing control command having the ninth coordinate value for drawing a line segment, and other figures. It is assumed that the drawing control instructions are stored in an arbitrary order.

In FIG. 1, a device-independent figure drawing control instruction string created by an application program is stored in a storage means 1.
After that, the conversion processing means 2 is started.

When the conversion processing means 2 is activated, the conversion processing means 2 starts the process shown in FIG. 2 in step 810, and inputs one command from the storage means 1. Next, according to step 820, it is determined whether processing of all instructions has been completed.

If all commands have been processed, step S7
0 outputs the conversion data to the graphic output bag f4 and ends the conversion process. If the processing of all instructions has not been completed, the instruction type is determined in step S30. If the command is a line width control command, the current value of the line width is stored in the work area in step 840, and the process moves to reading the next command Wt in step S10.

If the input command type is a line segment drawing control command, in step 850, the line segment drawing coordinate value, the current line width value, and the conversion to convert the device-independent coordinate value into device-dependent coordinate value are performed. M) Set the 17x value in register 5,
The line segment drawing control command conversion processing means 3 is called. Therefore,
Returning to step 810, the process moves to reading the next instruction.

If the input command type is neither a line width control command nor a line segment drawing control command, the command is converted from a device-independent figure drawing control command to a device-dependent figure drawing control command according to step 860. do. The conversion method is not covered by the present invention and will therefore be omitted. Following step 860, the process moves to step 810 to read the next instruction.

Through the processing described above, the device-independent graphic drawing control command string is converted into a device-dependent graphic drawing control command string, and is output to the graphic output device 4.

Next, with reference to FIG. 3, a process of converting a device-independent line segment drawing control command into a device-dependent figure drawing control system will be described.

It is determined in step 810 whether the current value of the nine line width passed through register 5 is 2 or more, and if it is 2 or more, in step 820 it is not treated as a line segment but as a rectangle with the thickness of the line width. Convert the current value.

If the current value of the line width is 1, it is converted into a line segment in step S30, and the process returns to the calling source.

Here, it is assumed that the storage means 1 shown in FIG. 1 stores instructions as shown in FIG. 4.

In the explanatory diagrams described above, FIG. 4(a) is an explanatory diagram showing the storage state of each instruction stored in the storage means 1.
Figure (b) is an explanatory diagram showing a line width control command. Figure 4 (
c) is an explanatory diagram showing line segment drawing control commands, and X1. Yt is the starting point of the line segment, X2. Y2
are the end points of each line segment. FIG. 4(d) is an explanatory diagram showing the control instructions for drawing graphics, and it is assumed that the operands corresponding to the instructions have different formats depending on the instruction code value.

(Effects of the Invention) As explained above, the present invention has the advantage that when converting a line segment drawing control command in a device-independent figure drawing control command sequence into a device-dependent figure drawing control command, When it is 2 or more, by converting the current value as a rectangle with the line width as the length of one side, the conventional line segment is converted by shifting it one dot at a time by the number of lines that have the same thickness as one line interval. This method has the effect of reducing the amount of converted data compared to methods that express thickness.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a line segment conversion method having a line width according to the present invention. FIG. 2 is a flowchart showing an example of the processing of the conversion processing means shown in FIG. FIG. 3 is a flowchart showing an example of the processing of the line segment drawing control command conversion processing means shown in FIG. FIG. 4 is an explanatory diagram showing the format of instructions stored in the storage means of FIG. 1. 1... Storage means 2... Conversion processing means 3...
Line segment drawing control command conversion processing means 4...Figure output device 5...Register

Claims (1)

[Claims] a storage means for storing a device-independent figure drawing control instruction string to be converted; and a conversion device for converting the device-independent figure drawing control instruction string into a device-dependent figure drawing control instruction string. a processing means, a line segment drawing control command conversion processing means called from the conversion processing means and for converting a line segment drawing control command independent of the device into a figure drawing control command dependent on the device; and a graphic output device for outputting the converted device-dependent graphic drawing control instruction sequence as a graphic, and the conversion processing means, together with the line segment drawing control instruction conversion processing means, is provided in the device. When converting an independent line segment drawing control command into a figure drawing control command that depends on the device, a line segment drawing control command with a line width of 2 dots (pixels) or more is converted as a polygon such as a rectangle. A method for converting a line segment having a line width, characterized in that the method is configured to perform processing to convert a line segment having a line width.