JPH0227678B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a character pattern generating device that generates character patterns such as Chinese characters, and more particularly to a character pattern generating device that generates italic character patterns.

Conventionally, the following method has been used to transform a normal character pattern into an italic character pattern. In other words, if the character pattern is expressed as dots, it is read out into a type of work area, and then subjected to a type of shift processing to transform it into italics. This has the disadvantage that it places a heavy load on the processing device because the number of pixels to be handled is large. Some attempts have been made to speed up processing using shift registers, but this has the disadvantage of complicating the hardware.

It also memorizes character patterns with strokes,
Among those that provide stroke data to the X and Y deflection coils of a CRT, there is one that controls the current applied to the deflection coils to make italic characters.
However, with this method, the character pattern memorized by strokes is converted into a pattern by dots, and then
The drawback was that it could not be used when displaying on a CRT.

SUMMARY OF THE INVENTION An object of the present invention is to provide a character generator capable of converting a character pattern expressed in strokes into italic characters at high speed.

According to the present invention, there is provided a data generating means for generating digital data of strokes constituting a character pattern, and the digital data of the strokes generated by the data generating means is converted in accordance with the conversion of the X-axis and Y-axis coordinate axes. In a character pattern generator that generates an italic pattern tilted by the tilt angle, the starting point indicated by coordinates (a, b) before conversion, the angle θ between the X axis before conversion and the X' axis after conversion, and the conversion Using the angle β between the previous Y-axis and the transformed Y'-axis, find the coordinates (a', b') after transformation as a'=b sinβ+a cosθ b'=b cosβ+a sinθ, and find the starting point a after transformation. A point ′,b′
The X-direction component △X' and the Y-direction component △Y' of the straight line connecting c', d' are the starting points a, b and a certain point c,
X-direction component △X and Y-direction component △ of the straight line connecting d
△X′=△Y sinβ+△X cosθ △Y′=△Y cosβ+△X sinθ △Y′=△Y cosβ+△X sinθ There is obtained a character generating device characterized in that it includes output means for converting the stroke data into dot data and outputting the converted dot data in the form of digital data.

In other words, the character pattern generation device of the present invention does not convert character pattern data expressed by strokes into dot pattern data and then into italic character pattern data, but converts the stroke data itself, which has a small amount of information. The data is converted into italic stroke data of an italic character pattern.

Next, the principle of conversion used in the present invention will be explained. Cartesian coordinates with the origin as 0 as shown in Figure 1
In XY, let X' and Y' be the coordinate axes obtained by tilting the X and Y axes and rotating them by angles θ and β as shown in the figure. If the point on the XY coordinates is also moved according to the rotation of this coordinate axis, point A (a, o) on the X axis becomes a point on the X′ axis.
A', point B (o, b) on the Y axis moves to point B' on the Y' axis. Here, ='=a and ='=b. Point A′ is clearly (a cosθ,
a sin θ). Also, point B' is (b sinβ, b
cosβ). Point C (a, b) in XY coordinates is
Moving to C', point C' becomes the intersection of a straight line passing through point B' and parallel to the X' axis and a straight line passing through point A' and parallel to the Y' axis.
Find the XY coordinate values of this point C′.

Draw a straight line parallel to the X-axis through point B', draw a line perpendicular to this straight line from point C', and let H be the intersection point. Also, draw a perpendicular line from point A' to the X axis and mark the intersection point as K. <
C′B′H=<A′OK=θ,<C′HB′=<A′KO=90°∴
＜B′C′H=＜OA′K and ′′=′, therefore △C′B′H=△A′OK therefore ′=, and
OK=a cosθ∴'=a cosθ The X coordinate of point B' is b sinβ. Therefore, the X coordinate of point C' is b sinβ+'=b sinβ+a cosθ. Similarly, the Y coordinate is found: b sinβ+'=b cosβ+a sinθ. From the above, it can be seen that point C (a, b) moves to point C' (b sin β + a cos θ, b cos β + a sin θ)...Equation (1).

From this we also understand the following: Point D (d ₁ ,
d ₂ ) and point E (e ₁ , e ₂ ) (both points not shown)
The X-direction component ΔX and Y-direction component ΔY of the straight line connecting can be expressed as follows.

△X=e ₁ −d ₁ ...Equation (2) △Y=e ₂ -d ₂ ...Equation (3) Also, when points D and E are moved according to the rotation of the X′Y′ axis, Assuming that D' and E' become D' and E', the XY coordinate values of points D' and E' will be as follows according to the conversion rule described above.

D' (d ₂ sinβ + d ₁ cosθ, d ₂ cosβ + d ₁ sinθ) E' (e ₂ sinβ + e ₁ cosθ, e ₂ coosβ + e ₁ sinθ) Therefore, the X and Y directions of the straight line connecting points D' and E' The components, △X′ and △Y′ are as follows.

△X′=(e ₂ −d ₂ )sinβ+(e ₁ −d ₁ )cosθ ……Equation (4) △Y′=(e ₂ −d ₂ )cosβ+(e ₁ −d ₁ )sinθ ……Equation ( 5) Using equations (2) and (3), △X' = △Y sinβ + △X cosθ ...Equation (6) △Y' = △Y cosβ + △X sinθ ...Equation (7) Vertical line before conversion After conversion, △X = 0 in equations (6) and (7), so △X' = △Y sinβ ...Equation (8) △Y' = △Y cosβ ...Equation (9) . Also, when converting the horizontal line, since △Y=0, △X'=△X cosθ...Equation (10) △Y'=△X sinθ...Equation (11).

Also, the slope △=△Y/△X of the straight line connecting points D and E is converted to the slope △' of the straight line connecting points D' and E' as follows.

△' = △Y' / △X' = ( △Y cosβ + △X sinθ) / (△Y sinβ + △X cosθ) = △cosβ + sinθ / △sinβ + cosθ ... (12) By the way, as a way to express the stroke, the starting point and ending point A method of specifying the coordinates of the starting point, a method of specifying the end point using the X direction component ΔX, and a Y direction component ΔY. A method of specifying the start point, the slope, and the X or Y coordinate of the end point. To obtain an italic character pattern by tilting the character pattern according to the rotation of the X' and Y' axes,
The XY coordinate values of the stroke can be converted as follows. In the case of , all coordinates are converted using equation (1). In this case, the blanking data indicating the start point of the stroke is converted using equation (1), and the XY direction components ΔX and ΔY are converted using equations (6) to (11).
In this case, the blanking data is converted using equation (1), the slope is converted using equation (12), and the X or Y coordinate of the end point is converted using equation (1).

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 2 is a block diagram of one embodiment of the present invention. Character codes, function codes, etc. are input from the input device 21. A processing device 22 consisting of a microprocessor decodes this, and if it is a character code, accesses the pattern memory 24, extracts the character pattern, and converts it into a stroke dot converter 2.
5 and convert it into a character pattern with dots,
This is given to the output device 23 to be printed or displayed. When italic characters are specified in the function code, the processing device 22 converts the stroke pattern read from the pattern memory 24 into an italic stroke pattern using a method described later and supplies it to the stroke dot conversion section 25. Stroke data is converted to dot data, and characters expressed by dots are obtained. The details of this stroke dot converting section are well known in Japanese Patent Publication No. 15624/1983, and will therefore be omitted.

FIG. 3 shows the format of stroke data. 31
is blanking data that indicates the starting point of the stroke, and 2 bytes of the 3 bytes indicate the X and Y coordinate values of the starting point. 32 is data indicating a straight line parallel to the X axis, 1 of 2 bytes.
The bite shows the X direction component ΔX. 33 is Y
The data indicates a straight line parallel to the axis, and one byte of the two bytes indicates the Y direction component ΔY. 34 is data representing a diagonal line, and 2 bytes out of 3 bytes indicate components ΔX and ΔY in both the X and Y directions. 35 is data indicating the end of the stroke data of that character. △X, △ in the above data
The most significant bit of Y (indicated by S in the figure) is data indicating a sign; if it is 0, it is +, and if it is 1, it is -.

If the character "dai" shown in Figure 4 is expressed as stroke data, the data will be as shown in Figure 5,
This is read out from the pattern memory 24. In FIG. 4, ~ indicates a stroke, and ~ indicates an end point of the stroke. If the data in FIG. 5 is converted with θ=0° and β=20°, an italic character pattern as shown in FIG. 6 will be obtained. The blanking data is converted using equation (1), and the numbers below the decimal point are rounded off to an integer. In addition, the straight line
Converted using (8) and (9), respectively. Diagonal lines indicate equations (6) and (7)
Convert by.

In this way, using the processing device 22 shown in FIG.
By converting the pattern data shown in the figure to the pattern data shown in FIG. 6, italic characters can be easily obtained. In FIG. 6, '-' indicate the stroke, and '-' indicate the end points of the stroke.

In this example, the character skeleton is expressed with strokes, so the character quality is not good, but it is known that high-quality characters can be obtained by representing the periphery of the character with strokes and filling it in. It can also be easily applied to cases where data is expressed as border data.

Furthermore, if the values of sinβ, cosβ, sinθ, and cosθ are calculated in advance and stored in the processing device 22, processing will be faster.

Note that if the output device 23 is a CRT or similar device that can display the stroke itself (without converting it to dots), the stroke dot converter 25 is unnecessary, and furthermore, the deflection control of the CRT beam to make it diagonal is unnecessary. .

As described above, the present invention has the effect of being able to generate italic character patterns at high speed by obtaining stroke data of italic character patterns obtained by converting stroke data using a data processing device. Further, there is no need to control the current of the CRT deflection coil for the italic character pattern, and the stroke data of the obtained italic character pattern can be converted into dot pattern data.

[Brief explanation of drawings]

Fig. 1 is a diagram explaining the principle of conversion used in the present invention, Fig. 2 is a block diagram of an embodiment of the present invention, Fig. 3 is a diagram showing the format of stroke data, and Fig. 4 is a diagram illustrating the format of stroke data. Figure 5 is a diagram showing the stroke data representing the character 'large'; Figure 6 is data obtained by converting the data shown in Figure 5 into italic stroke data. FIG. 7 is a diagram of an italic character pattern based on the data of FIG. 6. 21... input device, 22... processing device, 23...
...Output device, 24...Pattern memory, 25...
Stroke dot conversion section.

Claims (1)

[Scope of Claims] 1. Data generating means for generating digital data of strokes constituting a character pattern, and adjusting the digital data of the strokes generated by the data generating means to the conversion of the X-axis and Y-axis coordinate axes. In a character pattern generator that generates an italic pattern tilted by the tilt angle, the starting point indicated by the coordinates (a, b) before conversion, the angle θ between the X axis before conversion and the Find the coordinates (a', b') after transformation using the angle β between the Y-axis before transformation and the Y'-axis after transformation as a'=b sinβ+a cosθ b'=b cosβ+a sinθ, and find the starting point a after transformation. The X-direction component △X' and the Y-direction component △Y' of the straight line connecting ', b' and certain points c', d' are converted into a straight line X that connects the starting points a, b and certain points c, d before conversion.
Process of converting to stroke data tilted by the tilt angle based on the formula expressed by the direction component △X and the Y direction component △Y △X' = △Y sinβ + △X cosθ △Y' = △Y cosβ + △X sinθ 1. A character pattern generating device comprising: means; and output means for converting the stroke data converted by the processing means into dot data and outputting the converted dot data in the form of digital data.