KR20070026795A - Display apparatus, program and recording medium - Google Patents

Abstract

A display apparatus is provided with a display device for displaying lines and a control part for controlling the display device. As for given first point, second point and third point, the control part decides a first positional relationship between at least the first point or the second point, and the third point. Then, the control part selects one line pattern corresponding to the decided first positional relationship, from at least one line pattern, which is previously prepared and passes the first point and the second point, and displays a line passing the first point and the second point on the display device, corresponding to the selected line pattern. ® KIPO & WIPO 2007

Description

DISPLAY APPARATUS, PROGRAM AND RECORDING MEDIUM}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device, a program and a recording medium having a display device for displaying lines and a control unit for controlling the display device. According to the present invention, for example, a curved character can be displayed on a low to medium resolution display device at high speed.

An outline font expresses a character by the outline of a closed curve. This outline font is widely used as a technique of expressing a character based on vector data. The outline fonts are, for example, TrueType fonts and PostScript fonts. For TrueType font curves, a second order B-spline curve is used (see Equation 1). For curves in PostScript fonts, a Bezier curve is used (see Equation 2).

This font is suitable for displaying characters on a high resolution display device. Especially when printing characters on paper, such fonts are suitable. Further, the curves represented by the equations (1) and (2) pass both ends (starting point and end point) of the curve, but do not pass through the point (control point) between the start point and the end point.

Stroke fonts display characters in strokes of no thickness. This stroke font is widely used in the technique which displays a character based on vector data like an outline font.

This font is suitable for displaying characters on display devices of low to medium resolution. When displaying this stroke font on a display device, in general, a curve or a straight line is represented by connecting each of a plurality of points in a straight line without asking whether the line to be expressed is a curve or a straight line. We can draw at high speed in comparison.

Patent document 1 discloses the technique of drawing a straight line connecting two points at high speed.

This technique finds a constant string based on the slope of the straight line. Next, a control sequence is obtained from the constant sequence, and a straight line is drawn at high speed based on the control sequence.

For example, the constant string {2, 1, 1, 3} is calculated based on the slope 7/18 of the straight line. Next, control sequence {1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, from constant sequence {2, 1, 1, 3} 1, 0}. When increasing the drawing position of the straight line in the x direction, when the value of the control matrix is "1", the value of y is increased by drawing the value of y, and the value of y when the value of the control matrix is "0". Draw straight lines without increasing them.

Patent Document 1 also discloses calculating a constant sequence and a control sequence in advance.

Patent document 2 discloses the technique of drawing a curve at high speed. This technique uses these values when the values relating to the parameters are calculated in advance and stored, and the curves are represented by a Bezier curve or the like.

For example, when the parameter t is divided into 1024 in Equation 2, the possible values of t are (0, 1/1024, 2/1024, 3/1024,…, 1023/1024, 1024/1024). do. Here, the relationship between the value of t and the value of t ³ and the relationship between the value of t and the value of 3 (1-t) t ² is calculated in advance, and these relationships are tabled. In addition, the calculation of (1-t) ³ and 3t (1-t) ² uses the value of t ^{3 and} the value of 3 (1-t) t ² . As described above, according to the technique disclosed in Patent Document 2, the calculation shown in Equation 2 can be processed at high speed.

Patent Document 1: Japanese Patent Application Laid-Open No. 9-161082

Patent Document 2: Japanese Patent Application Laid-Open No. 1-255076

〈Problems to Solve Invention〉

However, the prior art has a problem shown below.

When an outline font is displayed on a display device of medium and low resolution, line widths are irregularly distributed and line distortion is likely to occur, resulting in poor character quality.

In the technique of Patent Document 2, each time a plurality of points are drawn, calculations involving floating point arithmetic occur, thereby limiting the speed of display. In general, CPU floating point operations are slower than CPU integer operations.

When the stroke font is displayed on the display device, a lump is noticeable in the curved portion of the character. This is because the stroke font expresses curved portions of characters in a straight line. In particular, if you increase the size of the character, the lump becomes noticeable.

It is difficult to design a stroke font with no thickness by expressing the curved portion of the character as a secondary B-spline curve or a Bezier curve. This is because the line does not pass through the control points between the ends of the curve. As curve interpolation passing through all control points, there is curve interpolation using cubic splines. However, this interpolation needs to put a constraint on the disadvantage, and there is a problem that the conditional part is difficult. In addition, there is a problem that the speed is difficult.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to provide a character display display apparatus, a program and a recording medium which can draw lines at high speed and reduce the recording capacity of data representing lines.

〈Means for solving problems〉

The display device of the present invention is a display device including a display device for displaying a line and a control unit for controlling the display device, wherein the control unit is configured for the given first point, second point, and third point. Determining a first positional relationship between at least one of the first point and the second point and the third point, and at least one passing through the first point and the second point in a pattern of at least one line prepared in advance Selecting a pattern of one line corresponding to the determined first positional relationship among the pattern of lines of, and displaying a line passing through the first point and the second point on the display device according to the pattern of the selected line, Thereby, the said objective is achieved.

A holding part for holding pattern information indicating a correspondence relationship between the first positional relationship and the pattern of the line may be further provided, and the selection of the pattern of the line may be performed with reference to the pattern information held in the holding part.

The first positional relationship may be determined according to the angle between the first straight line connecting the first point and the second point and the second straight line connecting the second point and the third point.

The controller determines a second positional relationship between at least one of the first point and the second point and the fourth point with respect to the first point, the second point, and the fourth point. Selecting one line pattern corresponding to the determined second positional relationship among the at least one line pattern, and a plurality of areas are allocated around the second point, and the third point and the fourth point. Is given to the same area among the plurality of areas, and the pattern of one line corresponding to the selected first positional relationship and the pattern of one line corresponding to the selected second positional relationship may be the same.

The said 1st point may be given to an origin, and the said 2nd point may be given to a 1st upper limit.

A plurality of areas are allocated around the second point, and the third point is given to one of the plurality of areas, one of the plurality of areas, and an area different from the one area. May have different sizes.

A plurality of areas may be allocated to only a part of the surroundings of the second point, and the third point may be provided to one of the plurality of areas.

The program of the present invention is a program for causing a display process to be executed in an information display apparatus having a display device for displaying lines, wherein the display process is performed for the given first, second and third points. Determining a first positional relationship between at least one of the one point and the second point and the third point, and at least one passing through the first point and the second point in a pattern of at least one line prepared in advance Selecting a pattern of one line corresponding to the determined first positional relationship among the patterns of one line, and displaying a line passing through the first point and the second point according to the selected line pattern on the display device And the above object is achieved.

A recording medium of the present invention is a recording medium that can be read by an information display apparatus having a display device for displaying a line, wherein the recording medium records a program for executing display processing on the information display apparatus, and displays the display medium. The processing includes, for a given first point, second point and third point, determining a first positional relationship between at least one of the first point and the second point and the third point, and at least prepared in advance. Selecting a pattern of one line corresponding to the determined first positional relationship among the patterns of at least one line passing through the first point and the second point in the pattern of one line; Accordingly, the method includes displaying a line passing through the first point and the second point on the display device, whereby the object is achieved.

<Effects of the Invention>

According to the display device, the program, and the recording medium of the present invention, without determining the trajectory of the line passing through the first point and the second point by calculation, it is determined from among the patterns of at least one line passing through the first point and the second point. By selecting one line pattern corresponding to the positional relationship, a line passing through the first point and the second point can be displayed. Therefore, the line passing through the first point and the second point can be displayed at high speed without the need to calculate the trajectory of the line passing through the first point and the second point requiring complicated calculation.

In this invention, the curve which connects three points is drawn using the table which shows the correspondence of the pattern of the line which passes through a 1st point and a 2nd point, and the positional relationship of 3 points. Therefore, the curve can be drawn only by reading the table, and no complicated calculation occurs. As a result, a line passing through the first point and the second point can be drawn at high speed.

Furthermore, the angle between the straight line passing through the first point and the second point and the straight line passing through the second point and the third point is classified and tabulated. As a result, the capacity can be reduced.

Moreover, only when a 2nd point exists in a 1st upper limit, table-taking is performed by classifying the angle of the straight line which passes through a 1st point and a 2nd point, and the straight line which passes through a 2nd point and a 3rd point. Therefore, the combination of three positions can be reduced. As a result, the capacity can be further reduced.

1 is a diagram showing an example of a curve passing through three points.

2 is a diagram illustrating another example of a curve passing through three points.

3 is a view showing another example of a curve passing through three points.

4 is a view showing another example of a curve passing through three points.

5 is a view showing another example of a curve passing through three points.

6 is a view showing another example of a curve passing through three points.

Fig. 7 is a diagram showing areas 1 to 28 allocated around the second point.

8 is a diagram showing the configuration of the character display apparatus 100 of the embodiment of the present invention.

9 is a diagram illustrating an example of the character data 42.

10 is a diagram illustrating an example of display of the character data 42.

11 is a diagram illustrating an example of the straight table 43.

12 is a diagram illustrating an example of the curve table 44.

13 is a diagram showing a value of a control string.

14 is a flowchart showing the character display processing procedure.

FIG. 15 is a flowchart showing a drawing data drawing processing procedure executed in step S104.

16 is a flowchart showing the linear drawing processing procedure executed in step S203.

17 is a flowchart showing the curve drawing processing procedure executed in step S204.

18 is a flowchart showing a first upper limit drawing processing procedure executed in step S409.

19 is a flowchart showing the second upper limit drawing processing procedure executed in step S410.

20 is a flowchart showing the third upper limit drawing processing procedure executed in step S411.

21 is a flowchart showing the fourth upper limit drawing processing procedure executed in step S412.

22 is a diagram showing coordinate data, scaled data and quantized data.

FIG. 23 is a diagram showing a result of drawing based on the quantized data shown in FIG.

Fig. 24 is a flowchart showing the procedure of editing the table.

Fig. 25 is a view showing a pattern of lines after changing display points.

Fig. 26 is a diagram showing a curve drawing table after changing the display point.

27 is a diagram showing the relationship between the acquisition of the value of tan ^-1 and tan ^-1.

Fig. 28 is a diagram showing an example of an area allocated around the second point.

<Explanation of sign>

10: input device

20: control unit

21: CPU

22: main memory

30: display device

40: auxiliary memory device

41: character display program

42: character data

43: straight table

44: curve table

100: character display device 1

(Example)

1. Principle of Invention

Hereinafter, the principle of the present invention will be described with reference to the drawings.

In drawing the curve, the present invention pays attention to the curve connecting three points, and by selecting a pattern of one line corresponding to the determined positional relationship among the patterns of at least one line passing through the first point and the second point. , A line passing through the first point and the second point may be displayed. Displays lines passing through the first and second points at high speed by selecting a pattern of lines passing through the first and second points without calculating the trajectory of the lines passing through the first and second points. can do.

Further, a holding unit for holding pattern information indicating a correspondence between the positional relationship and the line pattern is further provided, and the selection of the line pattern is performed with reference to the pattern information held in the holding unit. The pattern information is represented by a table, and a curve is drawn based on this table.

The reason why pattern information is represented by a table and a curve is drawn based on this table is shown below.

The first point is the origin (0, 0). The second point is assumed that the increase and decrease in the distance in the x direction and the increase and decrease in the distance in the y direction are within ± d. The third point is assumed that the increase and decrease of the distance in the x direction and the increase and decrease of the distance in the y direction are within ± d.

In this case, the combination of the first point and the second point is (2d + 1) × (2d + 1) branches. The combination of a 2nd point and a 3rd point also has (2d + 1) * (2d + 1) branches. Therefore, the combination of three points is ^four (2d + 1). In this way, the combination of the positions of the three points increases dramatically with d. For example, when d = 5, it is 14,641 branches, but when d = 10, it is 194481 branches, and when d = 20, it is 2825761 branches. Since the capacity of data that can be stored in the character display apparatus is limited, it is difficult to express such a combination as a table and store such a table in the character display apparatus when there are many combinations of three points.

As described above, in the present invention, even when displaying two different curves (first curve, second curve), the first point and the second point of the first curve and the first point and the second point of the second curve The same as the straight line passing through the first and second points of the first curve and the straight line passing through the second and third points of the first curve, and the first and second points of the second curve. If the angle between the straight line passing through and the straight line passing through the second point and the third point of the second curve is closer than the predetermined value, the pattern of the line passing through the first point and the second point may be the same pattern. For those who see the first and second curves, I notice that there is no discomfort.

1 shows an example of a curve passing through three points.

This curve passes through the first point (0, 0), the second point (7, 4), and the third point (10, 10). In Fig. 1, the points painted in black are these three points, and the points with many hatches are included in the line passing through the first point and the second point, and the points with few hatches are the second point. It is included in the line passing through the third point. In addition, a straight line passing through the first point and the second point and a straight line passing through the second point and the third point are shown.

2 shows another example of a curve passing through three points.

This curve passes through the first points (0, 0), the second points (7, 4), and the third points (13, 16). The first point (0, 3) and the second point (7, 4) are the same as the first point and the second point in FIG. 1, and the third point (13, 16) is the second point and the first point in FIG. It is a point on an extension line of a straight line passing through three points.

When the pattern of the line of FIG. 1 and the pattern of the line of FIG. 2 are compared, the pattern of the line passing through the second point and the third point is different, but the pattern of the line passing through the first point and the second point is the same.

3 shows another example of a curve passing through three points.

This curve passes through the first points (0, 0), the second points (7, 4), and the third points (12, 17). The first point (0, 0) and the second point (7, 4) are the same as the first point and the second point of FIG. 2, and the third points (12, 17) are left of the third point of FIG. This is the above point. The angle between the straight line passing through the first and second points of FIG. 2 and the straight line passing through the second and third points, the straight line and the second point passing through the first and second points of FIG. The angle with the straight line passing through a 3rd point is similar.

When the pattern of the line of FIG. 2 and the pattern of the line of FIG. 3 are compared, the pattern of the line passing through the second point and the third point is different, but the pattern of the line passing through the first point and the second point is the same.

4 shows another example of a curve passing through three points.

This curve passes through the first points (0, 0), the second points (7, 4), and the third points (14, 16). The first point (0, 0) and the second point (7, 4) are the same as the first point and the second point in FIG. 2, and the third point (14, 16) is the right of the third point in FIG. Below is the point.

When the pattern of the line of FIG. 2 is compared with the pattern of the line of FIG. 4, the pattern of the line passing through the second point and the third point is different, but the pattern of the line passing through the first point and the second point is the same.

As described with reference to Figs. 1 to 4, in the case of drawing another curve, even if the pattern of the line passing through the first point and the second point is the same, there is no discomfort to the person viewing the curve.

5 shows another example of a curve passing through three points. This curve passes through the first point (0, 0), the second point (7, 4), and the third point (5, 12).

6 shows another example of a curve passing through three points. This curve passes through the first points (0, 0), the second points (7, 4), and the third points (14, 6).

The first point (0, 0) and the second point (7, 4) shown in Figs. 5 and 6 are the same as the first point and the second point shown in Figs. 1 to 4, but the first point and the second point. The angle of the straight line passing through and the straight line passing through the second and third points is significantly different from the angle shown in FIGS. 1 to 4, and the trajectory of the line passing through the first and second points is shown in FIGS. Is different from

7 shows the area 1 to the area 28 allocated around the second point.

Area 1 to area 28 are allocated by dividing the area around the second point by 28 equally. When there are 3rd points in the same area, the combination of 3 points is reduced by making the pattern of the line which passes a 1st point and a 2nd point the same. For example, in the first curve, when the third point is at the position A in the region 1, and in the second curve, the third point is in the region 1 and the position B is different from the position A, the first curve is the first curve. The pattern of the line passing through the point and the second point is the same as the pattern of the line passing through the first and second points of the second curve.

Area 1 to area 28 are allocated around the second point, the first point is the origin (0, 0), and the second point is (X, Y) (X≤ ± d, Y≤ ± d: x at the first point When the increase and decrease of the distance in the direction and the distance in the y direction are within ± d), the position of the third point is somewhere in the region 1 to the region 28. Thus, a combination of three points (2d + 1) is ² × 28 branches.

Moreover, only when the second point is at the first upper limit, a table indicating a correspondence between the positional relationship and the line pattern is generated, and when the second point is at an upper limit other than the first upper limit, the table is used to It is possible to reduce the number of tables by finding a correspondence with the line pattern.

Only when the second point is at the first upper limit, the angle of the straight line passing through the first point and the second point and the straight line passing through the second point and the third point and the curve passing through the first point and the second point The correspondence with patterns is expressed in a table. If the second point is at the second upper limit, consider symmetry with respect to the y axis. If the second point is at the third upper limit, consider the symmetry with respect to the origin. If the second point is at the fourth upper limit, Consider symmetry for The combination of this case, the three points, (d + 1) is ² × 28 branches. For example, in the case of d = 5, there are 1008 combinations, in the case of d = 10, there are 3388 combinations, and in the case of d = 20, there are 12348 combinations. The required dose can be made small.

Moreover, the area allocated around the second point is not limited to 28 divisions. The number of divisions is arbitrary. Increasing the number of partitions increases the capacity of the table, but it is possible to increase the quality of the curve. Moreover, it is not limited to equal division. In a narrow angle, it may be divided finely, and in a wide angle, it may be broadly divided.

Fig. 28 shows an example of the area allocated around the second point.

Fig. 28A shows a plurality of regions (divided form 1) having different sizes.

A plurality of areas 1 to 8 are allocated around the second point. The third point is given to the area 2. For example, region 1 and region 4 are of different sizes.

Fig. 28 (b) shows an area (divided form 2) allocated only to a part around the second point.

A plurality of areas 1 to 5 are allocated around the second point. However, no area is allocated to the other portion (the diagonal portion).

According to the display object, the division form around the 2nd point can be selected. For example, when displaying Chinese characters, division type 1 is selected. When displaying katakana, the division type 2 is selected. Moreover, "display object" means an object displayed on a display device. For example, characters (kanji, hiragana, katakana, alphabet, etc.), figures, and symbols.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described with reference to drawings.

2. Character display device

8 shows the configuration of the character display apparatus 100 of the embodiment of the present invention.

The character display apparatus 100 may be a personal computer, for example. As the personal computer, any type of computer such as a desktop type or a laptop type can be used. Alternatively, the character display device may be a word processor.

In addition, the character display apparatus may be any information display terminal such as an electronic device or an information device having a display device. For example, the character display apparatus may be an electronic apparatus provided with a liquid crystal display device, a portable information terminal serving as a form information tool, a mobile telephone including a PHS, or a communication apparatus such as a general telephone / FAX.

The character display device 100 includes an input device 10, a display device 30 for displaying lines, a controller 20 for controlling the display device 30, and an auxiliary memory device 40.

The input device 10 is used to input the information which represents the character which should be displayed on the display device 30 to the control part 20. FIG. The information representing the character includes, for example, a code for recognizing the character and size information indicating the size of the character.

As the input device 10, any type of input device capable of inputting a code and a size can be used. An input device such as a keyboard, mouse or pen input device can be used. In the case where the character display apparatus 100 is a cellular phone, a numeric key for designating a telephone number of a communication partner may be used to input a code or a size. When the character display apparatus 100 is provided with the means for connecting to the communication line containing the internet, the message contained in the e-mail received from the communication line may be displayed on the display device 30. In this case, the means for connecting to the communication line functions as the input device 10.

In the auxiliary memory device 40, a character display program 41, character data 42, a straight line table 43, and a curve table 44 necessary for executing the program are stored.

The character display program 41 includes a scaling program 41a for scaling the character data 42 in accordance with a size output to the display device, a quantization program 41b for quantizing the scaled result, and a quantized result in the display device. And a drawing data drawing program 41c for drawing data of the quantized results so that they can be displayed on the screen.

As the auxiliary memory device 40, any type of auxiliary memory device capable of storing the character display program 41, the character data 42, the straight line table 43, and the curve table 44 can be used. In the auxiliary memory device 40, any recording medium can be used as the storage medium for storing the character display program 41, the character data 42, the straight line table 43, and the curve table 44. As shown in FIG. For example, a CD-ROM, CD-R, MO, DVD, IC card can be preferably used.

Furthermore, the character display program 41, character data 42, straight line table 43, and curve table 44 are not limited to those stored in the recording medium provided in the auxiliary memory device 40. For example, the character display program 41, the character data 42, the straight line table 43, and the curve table 44 may be stored in the main memory 22 or in a ROM (not shown). . The ROM may be, for example, a mask ROM, EPROM, EEPROM, proxy ROM. When such data is stored in the ROM, variations in various processes can be easily realized by simply replacing the ROM. For example, the ROM can be preferably applied to the case where the character display device is a portable information terminal or a cellular phone.

Further, the character display program 41, character data 42, straight line table 43, and curve table 44 are memories that hold fixed programs or data such as storage devices such as disks and cards or semiconductor memories. Can be retained in the medium. When the character display apparatus is provided with means for connecting to a communication line including the Internet, the character display program 41, the character data 42, the straight line table 43, and the curve table 44 from the communication line. You can download at least part of. In this case, the loader program required for download may be stored in advance in a ROM (not shown), or may be installed in the control unit 20 by the auxiliary storage device 40.

The control unit 20 includes a CPU 21 and a main memory 22.

The CPU 21 controls and monitors the entire character display device and executes the character display program 41 stored in the auxiliary memory device 40.

The main memory 22 temporarily stores data input from the input device 10 and data for display on the output device 30 or data necessary for executing the character display program 41. The main memory 22 is controlled by the CPU 21.

The CPU 21 generates the drawing data by executing the character display program 41 based on various data stored in the main memory 22. The generated drawing data is stored in the main memory 22 once and then output to the display device 30. The timing at which the drawing data is output to the display device 30 is controlled by the CPU 21.

9 shows an example of the character data 42. Specifically, the character data shown in Fig. 9 is vector data of the character "大" and has a resolution of 256 mesh. The character data shown in Fig. 9 includes a plurality of coordinate data.

Line No is a number given to the line which comprises the character "大". X represents the X coordinate value of the point on the line which comprises the character "大". Y represents the Y coordinate value of the point on the line which comprises the character "大".

The character "大" is comprised of three lines. Each of the three lines has a plurality of coordinate data representing a position. Line No 1 connects (8, 184) with two points (247, 184), and Line No 2 is (127, 246), (127, 181), (103, 106), (61, 49). ) And (11, 14), and the line No 3 connects (127, 181), (144, 127), (176, 73), (208, 40), and (246, 14).

10 is an example of the display of the character data 42. Specifically, it is a display of character data shown in FIG.

11 shows an example of the straight table 43. The straight table 43 is stored in the auxiliary memory device 40 (see Fig. 8).

"Index" shows the record number of a table, and "(dx, dy)" shows the increase of the x direction from the 1st point, and the increase of the y direction.

In this embodiment, the increase in the x direction and the increase in the y direction are within 20, but the increase in the x direction and the increase in the y direction are not limited to within 20. The increase in the x direction and the increase in the y direction are arbitrary.

"Control string" is represented by "0" and "1". In the case of dx≥dy, the increment of y in the case of increasing by one in the x direction is represented by &quot; 0 &quot; "0" indicates that the increase in the y direction is 0 when 1 increases in the x direction, and "1" indicates that the increase in the y direction is 1 when the number increases by 1 in the x direction.

For example, in the case of (dx, dy) = (2, 1), the control string is {0, 1}. This control sequence {0, 1} indicates that the increase in the y direction is 0 when the value increases by 1 in the x direction from the first point, and the increase in the y direction is 1 when the value increases by 1 in the x direction. The pattern of lines represented by this control sequence represents the pattern of lines passing through the first point and the second point.

12 shows an example of the curve table 44. The curve table 44 is stored in the auxiliary memory device 40 (see Fig. 8).

13 shows the value of the control string.

"Index" shows the record number of a table, and "(dx, dy)" shows the increase of the x direction from the 1st point, and the increase of the y direction.

In this embodiment, the increase in the x direction and the increase in the y direction are within 15, but the increase in the x direction and the increase in the y direction are not limited to within 20. The increase in the x direction and the increase in the y direction are arbitrary. The range of the increase in the x-direction and the increase in the y-direction of the curve table is smaller than the range of the increase in the x-direction and the y-direction of the straight table. In general, the distance between two points of the curve of the letter is a straight line of the letter. This is because the distance between two points is smaller than.

"Angle" shows where the 3rd point is in areas 1-28 (refer FIG. 7).

"Control string" is represented by "0"-"7" (refer FIG. 13). "0" represents movement to the right (right) with respect to the second point, "1" represents movement to the upper right (right), "2" represents movement to the upper (up), and "3" represents the left "4" represents the movement to the left (left), "5" represents the movement to the bottom left (bottom), "6" represents the movement to the bottom (bottom), "7" shows the movement to the lower right (lower right). For example, when (dx, dy) = (7, 4) and the third point is in the area 2, the control string is {0, 0, 1, 0, 1, 1, 1} (see Fig. 12). ). This control sequence indicates that the movement from the first point is the right, the right, the right, the right, the right, the right and the right. The pattern of lines represented by this movement passes through the first point and the second point when three points are the first point (0, 0), the second point (7, 4), and the third point (10, 10). The pattern of the line shown is shown (refer FIG. 1).

As described with reference to Fig. 12, the information included in the curve table 44 indicates the correspondence between the positional relationship between the second point and the third point and the line pattern. The curve table 44 is prepared in the auxiliary memory device 40 in advance.

Moreover, the pattern of the line | wire represented by the "control column" contained in the curve table 44 is not limited to a curve. The pattern of lines represented according to the "control column" may be a straight line. Such a control string is {1, 1, 1, 1}, for example.

1 to 13 and 28, the character display device 100 of the embodiment of the present invention has been described.

For example, in the example of FIGS. 1-13 and FIG. 28, the display device 30 respond | corresponds to the "display device which displays a line", and the control part 20 is a "controller which controls a display device", A control unit for determining a first positional relationship between at least one of the first point and the second point and the third point with respect to the first point, the second point, and the third point, in the pattern of at least one line prepared in advance, A control unit for selecting a pattern of one line corresponding to the determined first positional relationship among the patterns of at least one line passing through the first point and the second point, and the first point and the second point for the selected line pattern. Control unit for displaying the line passing through the display device. The auxiliary storage device 40 which stores the straight table 42 and the curve table 44 corresponds to the "holding unit for holding pattern information indicating a correspondence relationship between the first positional relationship and the line pattern".

However, the embodiments shown in Figs. 1 to 13 and 28 are merely examples of functions of the character display apparatus of the present invention. As long as the functions of the above-described means are achieved, a character display device having any configuration can be included within the scope of the present invention.

For example, the straight table 42 and the curve table 44 may be input to the display device from the outside of the display device. For example, when the straight table 42 and the curve table 44 are held in the holding portion connected to the display device via a network, the straight table 42 and the curve table 44 are displayed outside of the display device. Is entered into the device.

For example, the above-mentioned means may be implemented by hardware, may be implemented by software, and may be implemented by hardware and software.

For example, the character display apparatus stores a program (hereinafter referred to as a character display processing program) for executing the character display processing procedure. The character display processing program may be stored in advance in the program storage means included in the character display apparatus at the time of shipment of the computer.

Alternatively, the character display processing program may be stored in the program storage means after shipment of the computer. For example, the user may download the character display processing program for a fee or free from a specific website on the Internet, and install the downloaded program on a computer. When the character display processing program is recorded on a computer-readable recording medium such as a flexible disk, CD-ROM, DVD-ROM, or the like, the character display processing program using an input device (for example, a disk drive device) is used. May be installed on a computer. The installed program is stored in the program storage means.

Further, the details of the character display processing procedure will be described later.

As described with reference to Figs. 1 to 13 and 28, according to the display device of the present invention, the trajectory of the line passing through the first point and the second point is not calculated by calculation, but the first point and the second point. A line passing through the first point and the second point can be displayed by selecting a pattern of one line corresponding to the determined positional relationship among the patterns of the at least one line passing therethrough. Therefore, it is not necessary to calculate the trajectory of the line passing through the first point and the second point requiring complicated calculation, and the line passing through the first point and the second point can be displayed at high speed.

In this invention, the curve which connects three points is drawn using the table which shows the correspondence of the pattern of the line which passes through a 1st point and a 2nd point, and the positional relationship of 3 points. Therefore, the curve can be drawn only by reading the table, and no complicated calculation occurs. As a result, a line passing through the first point and the second point can be drawn at high speed.

Furthermore, the angle between the straight line passing through the first point and the second point and the straight line passing through the second point and the third point is classified and tabulated. As a result, the capacity can be reduced.

Moreover, only when the 2nd point exists in a 1st upper limit, sorting and tabulating the angle of the straight line which passes through a 1st point and a 2nd point, and the straight line which passes through a 2nd point and a 3rd point are performed. Therefore, it is possible to reduce the combination of the positions of the three points. As a result, the capacity can be further reduced.

3. How to display

14 shows a character display processing procedure. The character display processing is performed by the CPU 121 executing the character display program 141.

Hereinafter, the character display processing procedure will be described step by step with reference to Figs.

Step S101: In accordance with an instruction input from the input device 10, character data representing a character designated from the character data 42 is built. For example, the written character data contains a plurality of coordinate data (see Fig. 9).

Step S102: The coordinate data contained in the built character data is scaled to fit the output size. In the case where the output size is n dots, the coordinate data (x, y) is scaled in accordance with a predetermined calculation and changed to scaled data (X, Y). The predetermined calculation is X = (n-1) × x / 255 and Y = (n-1) × y / 255.

For example, when the output size is 36 dots, the coordinate data (x, y) (see Fig. 9) is scaled by a predetermined calculation and changed to scaled data (see Fig. 22).

Step S103: The scaled data is quantized and changed into quantized data. For example, there is a rounding off method as a quantization method. For example, the coordinate data (x, y) (see Fig. 9) is scaled by a predetermined calculation, and further quantized, thereby changing to quantized data (see Fig. 22).

In addition, the method of quantization is not limited to rounding off. Another method of quantization is disclosed in this application and the application by the applicant (Japanese Patent Application No. 2003-137918). The disclosed method includes a method of suppressing quantization error.

Step S104: With reference to the straight line table 43 and the curve table 44, drawing data is obtained from the quantization data.

Step S105: Based on the drawing data, an image is displayed in the display data 30. FIG.

After the image is displayed on the display device 30, the process ends.

Fig. 15 shows a drawing data processing procedure performed in step S104.

The drawing data processing procedure will be described step by step with reference to FIG.

Step S201: Quantization data is taken out. For example, in the case of the character "大", the quantized data corresponding to the called line No is taken out (refer FIG. 22). First, line No. 1 is called, and corresponding quantization data ((1, 25), (34, 25)) is taken out. Next, line No 2 is called, and corresponding quantization data ((17, 34), (17, 25), (14, 15), (8, 7), (2, 2) is taken out. Finally, line No. 3 is called, and corresponding quantization data (17, 25), (20, 17), (24, 10), (29, 5), (34, 2) is retrieved.

Step S202: It is determined whether three or more coordinate points are included in the quantized data corresponding to the called line No.

If it is determined that three or more coordinate points are included (Yes), the processing proceeds to step S204. If it is determined that three or more coordinate points are not included (NO), the process proceeds to step S203.

Step S203: Drawing data is obtained so that the line represented by the called line No is drawn in a straight line. With reference to the straight line table 43, drawing data is obtained from the quantized data.

Step S204: Drawing data is obtained so that the line represented in accordance with the called line No is drawn in a curve. With reference to the curve table 44, drawing data is calculated | required from quantization data.

Step S205: Determine whether there is a line to call.

If it is determined that there is a line to be called (YES), the processing proceeds to step S201. If it is determined (No) that there are no lines to call, the process ends.

16 shows the linear drawing processing procedure executed in step S203.

Hereinafter, the linear drawing processing procedure will be explained step by step with reference to FIG.

Step S301: Find the next values of the given coordinate points (x ₁ , y ₁ ), (x ₂ , y ₂ ) of the two points. According to dx ← abs (x ₂ -x ₁ ), the distance dx between x ₁ and x ₂ is obtained, and according to dy ← abs (y ₂ -y ₁ ), the distance dy between y ₁ and y ₂ is obtained.

In addition, the function abs (t) represents the absolute value of t.

In addition, when the variable which shows a drawing position is represented by (x, y), x ← x ₁ and y ← y ₁ represent the process of setting a 1st point as a drawing start position.

Step S302: Draw data of the first point (x, y).

Step S303: Obtain the control string from the straight table 43. Access to the straight line table is performed by the following calculation.

If the range of the table is n, the ((n + 1) x dy + dx + 1) th control string in the straight line table 43 is obtained. In this embodiment, since the range of the table is set to 20, the (20 + 1) × dy + dx + 1) th control string is obtained.

Step S304: Determine which of x ₁ and x ₂ is large.

If x ₂ is determined to be x ₁ or more (Yes), the processing proceeds to step S305. If x ₂ is determined to be less than x ₁ (no), the process proceeds to step S306.

Step S305: The value "1" is set in the variable incx. By the variable incx, the increase and decrease in the x direction is controlled.

Step S306: The value "-1" is set in the variable incx. By the variable incx, the increase and decrease in the x direction is controlled.

Step S307: Determine which of y ₁ and y ₂ is large.

If y ₂ is determined to be greater than or equal to y ₁ (YES), the processing proceeds to step S308. If y ₂ is determined to be less than y ₁ (no), the process proceeds to step S309.

Step S308: The value "1" is set in the variable incy. The variable incy controls the increase and decrease in the y direction.

Step S309: The value "-1" is set in the variable incy. The variable incy controls the increase and decrease in the y direction.

Step S310: Determine which of dx and dy is large.

If dx is determined to be dy or more (YES), the processing proceeds to step S311. If dx is determined to be less than dy (no), the process proceeds to step S314.

Step S311: It is determined whether or not the control sequence is over. If it is determined that the control string is over (Yes), the process ends. If it is determined that the control string is not end (No), the processing proceeds to step S312.

Step S312: The next point of (x, y) is calculated. Specifically, x is added to the value of incx controlling the increase and decrease of x (next value of x = x + incx), and y is added to the incy controlling the increase and decrease of y and multiplied by the value (△ y) of the control string ( next value of y = y + incy × Δy).

Step S313: Write data of (x + incx) and (y + incy × Δy). Specifically, the points (x + incx, y + incy × Δy) are plotted. The process then proceeds to step S311.

Step S314: It is determined whether or not the control sequence is over. If it is determined that the control string is over (Yes), the process ends. If it is determined that the control sequence is not end (No), the process proceeds to step S315.

Step S315: Calculate the next point of (x, y). Specifically, x is added to the incx controlling the increase and decrease of x and the value of multiplying the control string value (Δx) (next value of x = x + incx × Δx), and the value of incy controlling y to increase and decrease of y. Add (y next value of y = y + incy).

Step S316: Write data of (x + incx × Δx) and (y + incy). Specifically, the points (x + incx × Δx, y + incy) are plotted. The process then proceeds to step S314.

Fig. 17 shows the curve drawing processing procedure executed in step S204.

The following describes the curve drawing processing procedure step by step with reference to FIG.

Step S401: Three points are taken out from a given coordinate point. For example, given coordinate points 5 points ((a ₁ , b ₁ ), (a ₂ , b ₂ ), (a ₃ , b ₃ ), (a ₄ , b ₄ ), (a ₅ , b ₅ )) If, the first call gets three points (a ₁ , b ₁ ), (a ₂ , b ₂ ), (a ₃ , b ₃ ), and the next call (a ₂ , b ₂ ) , (a ₃ , b ₃ ), (a ₄ , b ₄ ) are taken out. In this way, three consecutive points are shifted by one point and taken out.

Step S402: Find the next value of the _three coordinate points (x ₁ , y ₁ ), (x ₂ , y ₂ ), and (x ₃ , y ₃ ) of the three points taken out. The distance dx between x ₁ and x ₂ is determined by dx ← abs (x ₂ -x ₁ ), and the distance dy between y ₁ and y ₂ is obtained by dy ← abs (y ₂ -y ₁ ).

Here, when the image of the variable representing the imaging location with (x, y), x ← x ← y ₁ and y is _1, a indicates the processing for setting the first point in the three points to the drawing start position.

Step S403: Of the three points taken out, first data (x, y) is drawn into the drawing data.

Step S404: The angle pattern is obtained from the angle between the straight line passing through the first point and the second point and the straight line passing through the second point and the third point.

It can be calculated by setting the angle pattern a = round (((Θ ₂ -Θ ₁ ) × 28) / (2 × Π).

Here, the angle Θ ₁ is an angle between the straight line passing through the first point and the second point and the x axis (Θ ₁ = tan ^-1 ((y ₂ -y ₁ ) / (x ₂ -x ₁ ))) The angle Θ ₂ is an angle between the straight line passing through the second point and the third point and the x-axis (Θ ₂ = tan ^-1 ((y ₃ -y ₂ ) / (x ₃ -x ₂ )).

The function round (t) represents the rounding of t. The calculation of tan ^-1 is a complicated process, but in the case of the present invention, since the angular pattern must be matched to either of the 28 divided parts, the demand for precision is not high. Therefore, it is also possible to speed up the calculation of tan ^-1 using the table which classified the factor of tan ^-1 into several patterns.

Here, by using a table showing the relationship between the argument tan ^-1 of the value of tan ^-1 Details of how to speed up the calculation of tan ^-1 will be described later.

As described above with reference to step S401 to step S404, at least one of the first point and the second point for the given first point, the second point, and the third point by executing step S401 to step S404. And the positional relationship with the third point is determined.

Step S405: Obtain (select) a control sequence from the curve table 44. Access to the curve table is performed by the following calculation.

If the range of the table is n, the number of divisions is t, and the angle pattern is a, the control string for the ((n + 1) x t x dy + t x dx + a) th of the curve table 44 is obtained. In the present embodiment, the range of the table is set to 15 and the number of divisions is set to 28. Thus, the ((15 + 1) x28xdy + 28xdx + a) th control string is obtained.

As described with reference to step S405, by executing step S405, the desired line is selected from the curve table 44 including information indicating the positional relationship between the second point and the third point and the correspondence between the line pattern. The control string representing the pattern is selected.

Step S406: Determine which of x ₁ and x ₂ is large.

If x ₂ is determined to be x ₁ or more (Yes), the processing proceeds to step S407. If x ₂ is determined to be less than x ₁ (no), the process proceeds to step S408.

Step S407: Determine which of y ₁ and y ₂ is large.

If y ₂ is determined to be equal to or greater than y ₁ (YES), the processing proceeds to step S409. If y ₂ is determined to be less than y ₁ (no), the process proceeds to step S410.

Step S408: Determine which of y ₁ and y ₂ is large.

If y ₂ is determined to be equal to or greater than y ₁ (YES), the processing proceeds to step S411. If y ₂ is determined to be less than y ₁ (no), the process proceeds to step S412.

Step S409: When the first point is the origin, first upper limit drawing is performed when the second point is at the first upper limit.

Step S410: When the first point is the origin, a second upper limit drawing is performed when the second point is at the second upper limit.

Step S411: When the first point is the origin, a third upper limit drawing is performed when the second point is in the third upper limit.

Step S412: When the first point is the origin, a fourth upper limit drawing is performed when the second point is at the fourth upper limit.

Step S413: It is determined whether a flag is set. If it is determined that the flag is set (YES), the process ends. If it is determined that the flag is not set (no), the process proceeds to step S414.

Step S414: By executing step S401, it is determined whether the acquired three points are the last three points.

For example, the coordinate points given in the curve drawing process are (a ₁ , b ₁ ), (a ₂ , b ₂ ), (a ₃ , b ₃ ), (a ₄ , b ₄ ), (a ₅ , b ₅ ) In the case of 5 points of, it is determined whether or not the three points taken out in step S401 are the last three points (a ₃ , b ₃ ), (a ₄ , b ₄ ), (a ₅ , b ₅ ).

If it is determined that it is the last three points (Yes), the processing proceeds to step S415. If it is determined not to be the last three points (No), the process proceeds to step S401.

Step S415: Set a flag, and set three points in reverse.

For example, when the last three points are set in the order (a ₃ , b ₃ ), (a ₄ , b ₄ ), (a ₅ , b ₅ ), the last three points are (a ₅ , b ₅ ), (a ₄ , b ₄ ), (a ₃ , b ₃ ) This is to prevent (a ₄ , b ₄ ) and (a ₅ , b ₅ ) from being drawn.

In the case where three points are taken out in order and are processed (see step S401), the drawing is performed between the first point and the second point among the three points, and is not drawn between the second point and the third point. Finally, to prevent the last section (between ((a ₄ , b ₄ ) and (a ₅ , b ₅ )) being drawn, the points (a ₃ , b ₃ ) and points (a ₅ , b ₅ ) is replaced and the last section is drawn.

Furthermore, in the present embodiment, the last three points are set in reverse, but the processing in step S414 may be changed to the processing for determining whether the acquired three points are earlier than the middle of the line. In this case, when it is determined that the acquired three points are earlier than the middle, three points are taken out in order from the first point (see step S401), and when it is determined that the acquired three points are not earlier than the middle, the last point 3 points are taken out in reverse order.

Figure 27 shows the response of the acquisition of the value of tan ^-1 tan ^-1. The value of tan ^-1 is an angle (degrees), and the argument of tan ^-1 is dy / dx. The angle θ is represented by (no × 360) / 56.

By using the table showing the relationship between the tan ^-1 value and argument tan ^-1 of the, there is no need to perform the calculation of tan ^-1. However, the value of tan ^-1 is 0-180 degrees (only a 1st upper limit and a 2nd upper limit), and the factor of tan ^-1 corresponding to 180 degrees <tan ^-1 <360 degrees is calculated and calculated | required. For example, the straight line passing through (0, 0) and (10, 5) is found to be between no4 and no5 because dy / dx = 0.5 (dy = 5, dx = 10). In this embodiment, assuming that the smaller no is selected, no = 4. In addition, since the straight line passing through (0, 0) and (-10, -5) is dy / dx = 0.5 (dy = 5, dx = 10), no = 4, but because it is the third upper limit value, 28 is added to make no = 32. That is, Θ ₁ = tan ^-1 ((y ₂ -y ₁ ) / (x ₂ -x ₁ )) is equivalent to finding the angle between the straight line passing through the first point and the second point and the horizontal line. If it is allowed to lower, we can replace it by finding the no of the table.

The value of tan ^-1 ((y ₂ -y ₁ ) / (x ₂ -x ₁ )) as a table is called no ₁ , and tan ^-1 ((y ₃ -y ₂ ) / (x ₃ -x ₂₎ If the value of)) is obtained from the table as no ₂ , the calculation of a = round (((Θ ₂ -Θ ₁ ) × 28) / (2 × Π)) yields a = round (abs (no ₂ -no ₁ ) / 2).

Hereinafter, the present invention will be described in detail with reference to FIGS. 1 to 4.

1 shows curves passing through (0, 0), (7, 4), and (10, 10). The value of no ₁ is 4. This is because (4-0) / (7-0) = 0.571. The value of no ₂ is 9. This is because (10-4) / (10-7) = 2. The angle pattern a is 3 (a = round (abs (9-4) / 2)).

2 shows curves passing through (0, 0), (7, 4), (13, 16). The value of no ₁ is 4. This is because (4-0) / (7-0) = 0.571. The value of no ₂ is 9. This is because (16-4) / (13-7) = 2. The angle pattern a is 3 (a = round (abs (9-4) / 2)).

3 shows curves passing through (0, 0), (7, 4), (12, 17). The value of no ₁ is 4. This is because (4-0) / (7-0) = 0.571. The value of no ₂ is 10. (17-4) / (12-7) = 2.6. The angle pattern a is 3 (a = round (abs (10-4) / 2).

4 shows curves passing through (0, 0), (7, 4), (14, 16). The value of no ₁ is 4. This is because (4-0) / (7-0) = 0.571. The value of no ₂ is 15. This is because (14-4) / (6-7) =-10. The angle pattern a is 6 (a = round (abs (15-4) / 2)).

In the case of using such a table, an angular pattern can be obtained without calculating a complicated trigonometric function.

18 shows the first upper limit drawing processing procedure executed in step S409.

Hereinafter, with reference to FIG. 18, the 1st upper limit drawing process sequence is demonstrated for every step.

Step S501: It is determined whether or not the control sequence acquired in step S405 is the end.

If it is determined that the control string is over (Yes), the process ends. If it is determined not to end (NO), the process proceeds to step S502.

Step S502: In response to the values of the control string (values "0" to "7": see FIG. 13), the process is divided.

If control value "0", the process proceeds to step S503. In the case of control value "1", the process proceeds to step S504. If control value "2", the process proceeds to step S505. In the case of control value "3", the process proceeds to step S506. In the case of control value "4", the process proceeds to step S507. If control value "5", the process proceeds to step S508. If control value "6", the process proceeds to step S509. If control value "7", the process proceeds to step S510.

Step S503: The value of x controlling the value in the x direction is increased by one. The process proceeds to step S511.

Step S504: Increase the value of x controlling the value in the x direction by 1 and increase the value of y controlling the value in the y direction by 1. The process proceeds to step S511.

Step S505: The value of y for controlling the value in the y direction is increased by one. The process proceeds to step S511.

Step S506: Decrease the value of x for controlling the value in the x direction by 1 and increase the value of y for controlling the value in the y direction by 1. The process proceeds to step S511.

Step S507: Decrease the value of x by 1 to control the value in the x direction. The process proceeds to step S511.

Step S508: Decrease the value of x for controlling the value in the x direction by 1 and decrease the value of y for controlling the value in the y direction by 1. The process proceeds to step S511.

Step S509: Decrease the value of y by one that controls the value in the y direction. The process proceeds to step S511.

Step S510: Increase the value of x for controlling the value in the x direction by 1 and make the value of y for controlling the value in the y direction be 1. The process proceeds to step S511.

Step S511: Draw data of the points (x, y) calculated in steps S503 to S510. For example, plot the point (x, y).

19 shows a second upper limit drawing processing procedure executed in step S410.

The second upper limit is y-axis symmetry with respect to the first upper limit. Therefore, since the difference in the processing order from the first upper limit drawing processing order (see Fig. 18) is only that the increase and decrease of x according to the control value is reversed, the description of steps S601 to S611 is omitted.

20 shows the third upper limit drawing processing procedure executed in step S411.

The third upper limit is origin symmetry with respect to the first upper limit. Therefore, the difference in the processing order from the first upper limit drawing processing order (see Fig. 18) is that the increase and decrease of x and the increase and decrease of y according to the control value are reversed, respectively, and thus the description of steps S701 to S711 is omitted. do.

21 shows a fourth upper limit drawing processing procedure executed in step S412.

The fourth upper limit is x-axis symmetry with respect to the first upper limit. Therefore, since the difference in the processing order from the first upper limit drawing processing order (see Fig. 18) is merely reversed by the increase and decrease of y according to the control value, the description of steps S801 to S811 is omitted.

22 shows coordinate data, scaled data, and quantized data.

The result of scaling and quantization of vector data (see Fig. 9) is shown.

FIG. 23 shows the result of drawing based on the quantized data shown in FIG.

The result of drawing quantization data (refer to FIG. 22) by the drawing data drawing process (refer to FIG. 15) is shown. By curve drawing, a character can be drawn with high quality.

Fig. 24 shows the procedure of editing the table.

25 shows the pattern of lines after changing the display point.

Fig. 26 shows a curve drawing table after changing the display point.

1, 12, and 24 to 26, the procedure of editing the table will be described step by step.

Step S901: Call the control string passing through three points, and display the pattern of lines on the edit screen. The pattern of lines displayed on the edit screen is shown in FIG. 1, for example. The pattern of lines passing through two points is displayed on the edit screen.

Step S902: The pattern of the displayed line is changed while viewing the screen. For example, the pattern of lines shown in FIG. 1 is edited into the pattern of lines shown in FIG.

Step S903: Only the patterns of the lines passing through the first and second points of the changed line patterns are represented in the control sequence, and the table is rewritten. The 1990th control sequence {0, 0, 1, 0, 1, 1, 1} of the curve table shown in FIG. 12 is the 1990th control sequence {0, 1, 0, 1, 0} of the curve table shown in FIG. , 1, 1}.

In this way, the contents of the curve table can be changed. However, the change result affects all the cases where the angles of the straight line passing through the first point and the second point and the straight line passing through the second point and the third point are divided into the same angle pattern.

The display procedure of the present invention will now be described with reference to FIGS. 14 to 21 and 24.

For example, in the examples of FIGS. 14 to 21 and 24, steps S401 to S404 are &quot; at least one of the first and second points and the first point, the second point, and the third point. Corresponds to the step of determining the first positional relationship with the three points, and in step S405, in the at least one line pattern prepared in advance, among the patterns of at least one line passing through the first point and the second point, Corresponding to the step of selecting a pattern of one line corresponding to the one-position relationship, and in steps S409 to S412, displaying the line passing through the first point and the second point on the display device according to the selected line pattern. Corresponds to. However, the examples of Figs. 14 to 21 and 24 are merely examples of the display procedure of the present invention. As long as each of the above-described steps is executed, a display order having any steps can be included in the scope of the present invention.

According to the program and the recording medium of the present invention, without determining the trajectory of the line passing through the first point and the second point by calculation, the positional relationship is determined from among the patterns of at least one line passing through the first point and the second point. By selecting a pattern of one corresponding line, a line passing through the first point and the second point can be displayed. Therefore, the line passing through the first point and the second point can be displayed at high speed without the need to calculate the trajectory of the line passing through the first point and the second point where complicated calculation is required.

In the above-described embodiment, the case in which characters are displayed has been described as an example, but the present invention is not limited thereto. The present invention can be applied to the case where a figure is displayed instead of or in addition to a character. In this case, instead of the character display program 41 or in addition to the character display program 41, a graphic display program is used, and instead of the character data 42 or in addition to the character data 42, You can use the data. The figure display program may also include the same steps as the character display program 41. The figure includes, for example, a part of a character, a shape, a symbol, and the like.

As mentioned above, although this invention was illustrated using the preferable Example of this invention, this invention is not limited to this Example and should not be interpreted. It is understood that the scope of the present invention should be interpreted only by the claims. It is understood that those skilled in the art can implement equivalent ranges from the description of the specific preferred embodiments of the present invention based on the description of the present invention and common technical knowledge. It is understood that the patents, patent applications, and documents cited herein are to be incorporated by reference as if their content were specifically described herein.

According to the display device, the program and the recording medium of the present invention, without determining the trajectory of the line passing through the first point and the second point according to the calculation, the pattern of at least one line passing through the first point and the second point is determined. By selecting one line pattern corresponding to the positional relationship, a line passing through the first point and the second point can be displayed. Therefore, the line passing through the first point and the second point can be displayed at high speed without the need to calculate the trajectory of the line passing through the first point and the second point where complicated calculation is required.

In the present invention, a curve connecting three points is drawn by using a table indicating the correspondence between the pattern of lines passing through the first point and the second point and the positional relationship between the third point. Therefore, the drawing of the curve is possible only by reading the table, and no complicated calculation occurs. As a result, a line passing through the first point and the second point can be drawn at high speed.

Furthermore, the angle between the straight line passing through the first point and the second point and the straight line passing through the second point and the third point is classified and tabulated. As a result, the capacity can be reduced.

Moreover, only when the 2nd point exists in a 1st upper limit, sorting and tabulating the angle of the straight line which passes through a 1st point and a 2nd point, and the straight line which passes through a 2nd point and a 3rd point are performed. Therefore, the combination of three positions can be reduced. As a result, the capacity can be further reduced.

Claims (9)

A display device displaying a line, A controller for controlling the display device In the display device provided with: The controller determines, for a given first point, second point, and third point, a first positional relationship between at least one of the first point and the second point and the third point, A pattern of one line corresponding to the determined first positional relationship is selected from among patterns of at least one line passing through the first point and the second point in a pattern of at least one line prepared in advance, And a line passing through the first point and the second point on the display device according to the pattern of the selected line. 2. The apparatus according to claim 1, further comprising a holding unit for holding pattern information indicating a correspondence between the first positional relationship and the pattern of the line, The selection of the pattern of the line is performed with reference to the pattern information held in the holding portion. The method of claim 1, wherein the first positional relationship is determined according to an angle between a first straight line connecting the first point and the second point and a second straight line connecting the second point and the third point, Display device. The said control part is a said 2nd positional relationship of the said 4th point and at least one of the said 1st point and said 2nd point with respect to the said 1st point, said 2nd point, and a 4th point. Decide, The control unit selects a pattern of one line corresponding to the determined second positional relationship from among the at least one line pattern, A plurality of areas are allocated around the second point, The third point and the fourth point are given to the same area among the plurality of areas, And the pattern of one line corresponding to the selected first positional relationship and the pattern of one line corresponding to the selected second positional relationship are the same. The display device according to claim 1, wherein the first point is given to an origin and the second point is given to a first upper limit. The method of claim 1, wherein a plurality of areas are allocated around the second point, The third point is given to one of the plurality of regions, One display area of the plurality of areas and another area different from the one area have different sizes. The plurality of areas according to claim 1, wherein only a part of the periphery of the second point is allocated. The third point is provided to one of the plurality of areas. A program for causing display processing to be performed on an information display apparatus having a display device for displaying a line, The display processing is For a given first point, second point and third point, determining a first positional relationship between at least one of the first point and the second point and the third point, Selecting a pattern of one line corresponding to the determined first positional relationship among the patterns of at least one line passing through the first point and the second point in the at least one line pattern prepared in advance; And displaying a line passing through the first point and the second point on the display device according to the pattern of the selected line. A recording medium readable by an information display apparatus having a display device for displaying a line, The recording medium records a program for executing display processing on the information display apparatus, The display processing is For a given first point, second point and third point, determining a first positional relationship between at least one of the first point and the second point and the third point, Selecting a pattern of one line corresponding to the determined first positional relationship among the patterns of at least one line passing through the first point and the second point in the at least one line pattern prepared in advance; And displaying a line passing through the first point and the second point on the display device according to the selected line pattern.

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