JPH01156881A - Plotting method for stroke character - Google Patents

Abstract

PURPOSE:To omit-undesired processing and to improve the efficiency of processing for a stroke character of small size by regarding no apex of the stroke character and skipping the operation to the process of the next apex in case the corresponding stroke character is smaller than prescribed size. CONSTITUTION:Another mode 4 where the operation is skipped to the next process in case a character displayed on a screen is smaller than prescribed size is used in addition to three types of modes which are given to apex data on conventional stroke characters. The apex data forming each character stores the coordinates and the mode of the relevant apex. In this respect, such an apex that requires no form of a display character even tough it is neglected is previously checked with a character smaller than the prescribed size. Then this apex is designated as the mode 4. As a result, apex processing is omitted in the mode 4 at a plotting process. Thus useless processing is omitted and therefore the processing efficiency is improved.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a stroke character drawing method.

[Conventional technology]

Stroke characters on graphic displays represent characters as a collection of straight lines, and the characters are displayed by giving the start and end points of each straight line and determining display dots to connect those points with straight lines (straight line expansion). . If characters are subdivided to increase the number of straight lines, even curved parts will be displayed more accurately, but this will require more straight lines to be developed, increasing processing time.

Furthermore, since the display dot is the smallest display unit on a display, there is no point in making it too fine.

[Problem that the invention seeks to solve]

In conventional stroke character drawing processing, linear expansion is performed for all vertex coordinates, regardless of the size of one displayed character. However, when the character size is small, each vertex is often mapped to the same pixel, and the error of each vertex relative to the pixel becomes large, resulting in distorted characters. In such a state, there is no point in processing all the vertex coordinates, and there is a problem in that only the processing time increases.

An object of the present invention is to provide a stroke character drawing method that improves processing efficiency by eliminating unnecessary processing for small-sized stroke characters.

[Means for solving problems]

The above purpose is based on three modes given to each vertex data of conventional stroke characters: Mode 1: "Register this vertex as the starting point", Mode 2: "Draw from the starting point to the actual vertex and register this vertex as the starting point"; Mode 3: In addition to [drawing from the starting point to the main vertex and finishing the main character data], there is another mode 4: [Normally the same as mode 2, but when the character size displayed on the screen is smaller than a predetermined value, processing is performed. This is achieved by adding "skip" and performing drawing processing while ignoring the vertices in mode 4 when the character size is smaller than a predetermined value.

[Effect]

Vertex data constituting each character stores the coordinates and mode of the vertex. Therefore, in the case of characters whose size is less than the stone room value, if you find in advance vertices that do not require the shape of the displayed character even if ignored, and specify such vertices as mode 4, this vertex will be used during the drawing process. Processing of vertices in mode 4 can be omitted, and processing efficiency can be improved by eliminating unnecessary processing.

〔Example〕

The present invention will be explained below using examples. FIG. 2 shows the hardware configuration of the graphic display system, which includes a central processing unit (CPU) 202 and a main memory 20.
1, graphic figure information is stored in the segment buffer 203.

The stored information is sent to the bus controller 204 by the graphic display processor (GDP) 205.
The information is interpreted and developed into an image on the frame memory 206, and displayed on the display 207.

The stroke character data is stored in the segment buffer 203, and when a character expansion command is issued, the stroke character data is referred to and is processed according to each vertex mode.
It is drawn by linear expansion.

Figures 3 and 4 show the stroke character structure and stroke character data for the character "GII." The straight line connecting the vertices 301 to 316 in Figure 3 constitutes the character "G", and the data of these vertices is composed of 16 bits as shown in Fig. 4, and the X coordinate is given by bits 14 to 8.
It can take a numerical value in the range 0 to 6o. Y coordinate is bit -6
It is given by ~O and can take a numerical value in the range O~80. The above X and Y coordinates are mapped and expanded to coordinates on the actual physical screen using a proportional distribution method. Also, 2 for each vertex
There are two flags a and b, and these two bits represent four vertex modes. When (a, b) = (0, O),
This vertex is in mode 1 of "register starting point". (a,
b) When = (0, 1), mode 2 is "draw from the starting point to the main vertex and register the main vertex as the starting point". (a, b)
= (1, 1) is mode 3 "draw from the starting point to the main vertex and end the main character processing". Conventionally, there were only these three modes, but in the present invention, another mode is set (a, b) = (1, O) [Normally, (a, b)
) = (0, 1), but when the font size is small, the processing of this vertex is skipped.'' Mode 4 has been added.

FIG. 1 is a flowchart showing an embodiment of the stroke character drawing method of the present invention.
Executed by In the figure, before processing stroke characters, it is determined whether the character size output on the screen is smaller than a predetermined value (for example, 16 x 16 dots), and the character size flag is turned on (if small) or off ( Steps 601-603), then calculate the data address of the character (step 604)
.

Next, from the stroke character data shown in Figure 4,
Read the coordinate data and mode of the first vertex (step 605), and if the mode is 1, "register the starting point" (
Step 610) Next data read (Step 605)
Move to. When the mode is 2°3, "drawing from the starting point to this vertex" is performed (step 609), and "registering the starting point" is performed (step 610), and then when the mode is 3, processing for one character is finished. (Step 611). On the other hand, when the mode is 4, the 1 character size flag is determined in step 60.
8) If it is off, it is drawn, but if one character is small and it is on, it jumps to the next character data read (step 605) and no processing is performed on that vertex.

Fig. 5 shows an example of character stroke processing for a character 1KG'', and Fig. 5 (a) shows each vertex data of a character 501 only in modes 1 to 3 (mode 4 in Fig. 4;
(a, b) = (1, O) all in mode 2; (
A display screen 502 (5×5 dot screen) is shown in the case of 0, 1). However, the character 501 (50 described later)
(Same for 3) The code attached to the upper point is the mode number. On the other hand, FIG. 5(b) shows the method of the present invention,
Modes 1 to 4 are specified as shown in FIG. At this time, if one character size is small, the vertex of mode 4 will be ignored, and the vertices of mode 4 will be ignored.
A display surface 504 of ×5 dots is obtained. If the character size (number of dots) is small in this way, the shape of the displayed character will hardly change even if the character is expanded while skipping some vertices, and no processing time is required for the skipped vertices.

According to this embodiment, for example, for It G 11 text character strokes with a character size of 16 pixels x 16 pixels or less, when the data designation shown in FIG. 4 is performed, 5 out of 16 characters are designated as mode 4. The processing speed can be approximately 11/16 of the conventional processing speed.

〔Effect of the invention〕

According to the present invention, since stroke character drawing processing is performed at high speed, it is possible to realize a graphic display device with good man-machine performance.

[Brief explanation of the drawing]

FIG. 1 is a flowchart showing an embodiment of the method of the present invention, FIG. 2 is a hardware configuration diagram of a system to which the present invention is applied, FIGS. 3 and 4 are diagrams showing the stroke character structure and its data, FIG. 5 is a diagram showing an example of displayed characters according to the method of the present invention. 202... Central processing unit, 203... Segment buffer, 205... Graphic display processor.

Claims (1)

[Claims] 1. For each vertex of a stroke character, the first mode indicates that the vertex is the start point of the next process, the second mode indicates that it is the end point and the start point of the next process, or the end point and the corresponding The character data is assigned a number indicating which mode of the third mode indicating the end, and the coordinate position of the vertex of the first mode or the second mode is assigned to the next mode of the second mode or the second mode. In a stroke character drawing method in which a stroke character is generated by sequentially executing a straight line development process for each vertex to create display data for displaying a straight line leading to the coordinate position of a vertex in three modes on a display surface, A fourth mode is provided to correspond to some of the vertices in the second mode instead of the second mode, and the vertices to which the fourth mode is associated are associated with a corresponding stroke character. If the size exceeds the above-mentioned predetermined size, the stroke is processed as a second mode vertex, and if the size is smaller than the predetermined size, it is not considered as the vertex of the stroke character and the process skips to the next vertex. How to draw characters.