JP3473046B2 - Non-erected character drawing method and apparatus - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for drawing a non-erect character which has been enlarged or reduced to a specified magnification based on vector data of an upright character read from a font or the like.

In recent years, output devices of computers have been diversified, but in order to handle data output to these diversified output devices in a unified manner, graphic data are expressed in a format independent of the output devices. The method of doing is often used. Various conversion processes such as enlarging, reducing, rotating, transforming, etc. are performed on the data expressed in such a way for each device. It is desired that the conversion be performed as faithfully as possible.

[0003]

2. Description of the Related Art FIG. 7 is a block diagram showing a conventional drawing apparatus 80. The drawing device 80 is provided, for example, as a part of a printer device. Character information and control information are sent from the host to the printer device. As the character information, the character code of the character to be printed and its attribute information, such as the character size, the character shape, and the character style, are sent. Character size and glyph are specified vector B, U
Specified by. The designated vector B (Bx, By) indicates the direction and magnification of the horizontal component of the character, and the designated vector U (Ux, Uy) indicates the direction and magnification of the vertical component of the character.

FIG. 3 is a diagram for explaining the designated vectors B and U. FIG. 3A shows designated vectors B and U when designating upright characters of the same size. The designated vectors B (1,0) and U (0,1) in this case are oriented at 0 degrees (horizontal direction) or 90 degrees (vertical direction), respectively, and have a length of "1".

FIGS. 3B, 3C and 3D are designating vectors B for designating a 1 × oblique character, a 1 × -45 ° rotated character, and a 2 × −45 ° rotated character, respectively. U.
For example, in FIG. 3C, the designated vector B (0.70
7, -0.707), U (0.707, 0.707)
Are oriented at -45 degrees or 45 degrees, respectively, and have a length of "1".

Further, in FIG. 3D, designated vectors B (1.41, -1.41), U (1.41, 1.4)
1) is oriented at -45 degrees or 45 degrees and has a length of "2", respectively.

The font 85 stores vector data of upright characters of standard sizes for characters of various fonts. Upright letters are the original typefaces such as Mincho typeface, Gothic type, etc.
Rotated characters, italic characters, etc. that have undergone rotation processing, transformation processing (tilt processing), etc. are called non-upright characters.

In the drawing device 80 of FIG. 7, the character information sent from the host is analyzed by the data analysis unit 81. In the coordinate conversion unit 82, vector data corresponding to the specified character code is read from the font 85, and conversion processing is performed based on the specified vectors B and U specified.

In the conversion process of the coordinate conversion unit 82, an operation based on the following equation (1) is performed.

[0010]

[Equation 1]

Here, x and y are the coordinate values of the bending point of the original vector data, and xa and ya are the coordinate values of the bending point of the converted vector data. The bending point is a connecting point of each vector in vector data.

For example, as the designated vectors B and U, FIG.
When the designated vectors B and U shown in (d) are sent,
In other words, if a doubled -45 degree rotated character is specified,
The coordinate value of each bending point is obtained as follows.

Xa = Bx.x + Ux.y = 1.41.x
+1.41 ・ y ya = By ・ x + Uy ・ y = 1.41 ・ x + 1.41 ・
y After the conversion processing is performed for all the bending points, the drawing processing unit 83 draws and expands on the bitmap memory 84 based on the vector data.

[0014]

However, according to the above-mentioned conventional conversion processing, the size (size) of the non-upright character after conversion does not exactly match the specified size, and the size between them does not match. There was a problem that the size was different.

That is, in order to facilitate understanding, FIG.
As shown in FIG. 5, a case will be described in which a double enlarged upright character is designated for the character “X”, which is an upright character stored in a font having a size of 5 × 5 dots.

In the font shown in FIG. 4, the upper left vertex is the origin (0,0), and the coordinates of the other three vertices are (4,0) (4,4) (0,4). . The bending points of the vector data of the character “X” are four vertices and the central point (2, 2). Designated vectors B and U are (2,0)
It is (0, 2).

When these bending points are converted based on the above equation (1) and drawn in the bitmap memory 84, the coordinate values of each bending point are doubled as shown in FIG. 6 (a). Enlarged upright characters are obtained. As can be seen in FIG. 6 (a), the size of the original character "X" must be 5x5 dots, and the doubled upright erect character must be exactly 10x10 dots. The size of the obtained enlarged upright characters is 9 × 9 dots. This is 9/5 times the original character "X", not the specified double.

Further, as shown in FIG.
When the 5-degree rotated character is designated, the conversion process is similarly performed based on the above formula (1), and the converted character (enlarged non-upright character) is shown in FIG. 6B. As described above, a 12 × 12 dot character is obtained. The enlarged non-upright character shown in FIG. 6 (b) is obtained by rotating the enlarged upright character shown in FIG. 6 (a) as it is by −45 degrees, and its size is not double, but about It has become 9/4 times.

Incidentally, the cause is that the position of the bending point or the outline is ideally indicated by a point having no area or a line segment having no line width. This is because it can be indicated only by the dots that it has or its continuation, and in the conversion process, the origin is set to “0” instead of multiplying the dot number by the magnification.
This is because the coordinate value to be multiplied by is multiplied by the magnification.

In view of the above problems, the present invention draws a non-upright character based on the original upright character read from a font or the like, and draws a non-upright character with a more accurate size based on a designated magnification. The purpose is to get upright letters.

[0021]

In order to achieve the above-mentioned object, the invention of claim 1 is a non-upright character enlarged or reduced to a designated magnification based on the original vector data of the upright character. For drawing the vector data, the value being one less than the number of dots when the enlarging process or the reducing process is performed at a specified magnification, and the value being one less than the number of dots of the original erect character. The vector data of the variable upright erect character is obtained by multiplying by the value of the ratio, and the obtained vector data of the variable upright character is subjected to coordinate conversion processing for rotation or deformation, and this It is characterized in that the vector data of the upright character is obtained, and the vector data of the non-upright character is expanded in the bitmap memory based on the obtained vector data.

The invention of claim 2 is an apparatus for drawing a non-erect character enlarged or reduced to a specified magnification based on the original vector data of the erect character.
The vector data is scaled by multiplying the vector data by a ratio of a value that is one less than the number of dots when the enlarging process or the reducing process is performed at a specified magnification and a value that is one less than the number of dots of the original erect character. Character size conversion means for obtaining vector data of upright characters, and for obtaining vector data of non-upright characters by performing coordinate conversion processing for rotation or deformation on the vector data of the variable upright characters. It is characterized by comprising coordinate conversion means and drawing processing means for developing in a bitmap memory based on the vector data of the non-upright characters.

[0023]

[0024]

[0025]

The original upright character CA is first subjected to enlargement processing or reduction processing so as to have a specified magnification, and vector data of the variable upright character CB having a size matching the specified magnification is obtained. Desired.

At this time, for example, the vector data has a value that is one less than the number of dots when the enlarging process or the reducing process is performed at a specified magnification, and a value that is one less than the number of dots of the original upright character CA. By multiplying by the value of the ratio of
The vector data of the variable magnification erect character CB is obtained.

Next, a coordinate conversion process is performed on the obtained variable upright character CB to obtain vector data of the non-upright character CC having the same size as the variable upright character CB. The non-upright character CC is expanded in the bitmap memory 15 based on the obtained vector data of the non-upright character CC.

In the present invention, characters include symbols or figures.

[0029]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing a drawing apparatus 2 according to the present invention, and FIG. 2 is a flowchart of drawing processing by the drawing apparatus 2. Note that the description of the matters described in the section of the related art will be simplified.

The drawing device 2 is composed of a data analysis unit 11, a character size conversion unit 12, a coordinate conversion unit 13, a drawing processing unit 14, a bitmap memory 15, a font 16, and the like.

The data analysis unit 11 analyzes the character information and control information sent from the host through an interface unit (not shown), and when it is character information, the type of character font, character code, designated vector B. , U, etc. are sent to the character size conversion unit 12 (# 1).

The character size conversion unit 12 reads out vector data (x, y) which are upright characters CA from the corresponding font 16 based on the sent font and character code, and based on the designated vectors B and U. Scaled up or down, and scaled erect character data (xc, yc)
Is calculated (# 2).

In the conversion processing (scaling processing) of the character size conversion unit 12, an operation based on the following equation (2) is performed.

[0034]

[Equation 2]

Here, x and y are the coordinate values of the bending point of the vector data of the original upright character CA, and xc and yc are
It is the coordinate value of the inflection point of the converted vector data. Further, a and b are the number of dots in the vertical direction or the horizontal direction of the original font 16, which is recognized in advance by the character size conversion unit 12 according to the content of the font 16. | B |, | U |
Is the length (magnification) of the designated vectors B and U. That is, | B | = (Bx ² + By ² ) ^1/2 | U | = (Ux ² + Uy ² ) ^1/2 .

The above equation (2) can be expanded to the following equations (3) and (4). xc = [(b · | B | −1) / (b-1)] · x (3) yc = [(a · | U | −1) / (a-1)] · y (( 4) In these equations (3) and (4), the coefficients (magnification factors) applied to x and y on each right side are modified so as to correct an error caused by the bending point being represented by coordinate values. There is.

That is, for example, when the size of the font 16 is set to 38 × 38 dots and the magnification is doubled, each coefficient becomes “75/37”. The value of this coefficient "75/37" is "7" when the numerator is twice the number of dots.
The value obtained by subtracting "1" from 6 "and the denominator being the value obtained by subtracting" 1 "from" 38 "which is the number of dots are respectively, and the value of the ratio is a value larger than" 2 ". . From another point of view, the denominator is "1" larger than twice the value of "37" which is the coordinate value of the vertex. Thereby, for example, when the value of x or y is “37” (when it is a vertex), the value of xc or yc becomes “75”, and the obtained variable upright character CB has the original size. It is exactly twice as large as 76 dots.

As described above, the character size conversion unit 12 causes the coordinates (x, y) of each bending point of the original vector data of the upright character CA to accurately match the designated magnification. Is converted (scaled) into the coordinates (xc, yc) of each bending point of the vector data corresponding to.

The coordinate conversion unit 13 performs only the coordinate conversion process on the data (xc, yc) of the variable scale upright character CB based on the designated vectors B and U, and the data of the variable scale upright character CC. Calculate (xa, ya) (# 3).

In the conversion process (coordinate conversion process) of the coordinate conversion unit 13, an operation based on the following equation (5) is performed.

[0041]

[Equation 3]

Here, xa and ya are the coordinate values of the inflection points of the vector data after conversion. That is, the coordinate conversion unit 1
According to 3, the coordinates (xc, yc) of each inflection point of the vector data of the variable magnification upright character CB are converted into the coordinates (xa, xa, ya)) (coordinate conversion).

The drawing processing unit 14 draws a character in the bitmap memory 15 based on each data (xa, ya) of the scaled non-erect character CC (# 4). The scaled non-upright characters CC drawn in the bitmap memory 15 are printed on a sheet by a print control unit (not shown).

Next, with respect to the character "X" which is the upright character CA stored in the font of the size of 5.times.5 dots shown in FIG. 4, a doubled -45 degree rotation character (variable non-upright character) is used. The case where is specified will be specifically described.

FIG. 5 (a) is a diagram showing a variable upright character CB obtained from the character "X" of the upright character CA shown in FIG.
FIG. 5B is a diagram showing a variable scale upright character CC obtained from the variable scale upright character CB shown in FIG. The designated vectors B and U in this case are (1.41, -1.41), U
(1.41, 1.41), | B | = 2, | U | =
2, a = 5 and b = 5. The calculation result is rounded to an integer, for example, by rounding.

First, from the above equations (3) and (4), xc = (9/4) * x yc = (9/4) · y Is obtained.

In the character size conversion unit 12, for example, the coordinates of each vertex are (0,0) (4,0) (4,4) (0,4).
Is (0,0) (9,0) (9,
9) converted to (0, 9). The scaled erect character CB obtained by this conversion has a structure of 10 × 10 dots which is exactly doubled, as shown in FIG.

Next, in the coordinate conversion unit 13, the coordinates (0,0) (9,0) (9,9) (0,9) of each vertex are calculated as (0, 0) (6, -7) (1
2,0) (6,6). The scaled non-erect character CC obtained by this conversion is, as shown in FIG. 5 (b), the same scaled non-erect character as shown in FIG.
It is about 1 dot larger than that in (b). In this way, the difference in size of the variable-magnification non-upright characters CC is improved and more accurately doubled in size, approaching the original size.

In the above embodiment, the case where the variable scale non-erect character CC is drawn based on the vector data which is the erect character CA read from the font 16 has been described, but the vector data sent from the host is described. The drawing may be performed based on It can also be applied when reducing the original upright characters CA. As the bitmap memory 15, various memories such as a memory capable of drawing characters for one page, a plurality of pages, or several lines, or a small buffer memory dedicated to the above-described drawing processing can be used. . Other processing may be performed between the character size conversion unit 12 and the coordinate conversion unit 13, or between the coordinate conversion unit 13 and the drawing processing unit 14.

In the above-described embodiment, the case where the lengths of the designated vectors B and U indicate the magnification is explained, but it is also applied to the case where it indicates the size of the variable non-erect character CC itself. Of course you can. In that case, the above equation (2) needs to be modified. Further, the magnification and the direction may be designated by another method instead of the designated vectors B and U. The size of the original upright character CA, how to take the coordinate direction and the rotation direction, how to round a small number, the configuration of the drawing device 2, the processing content, the content of the flowchart, and the like may be variously changed other than those described above. it can.

[0051]

According to the present invention, when drawing a non-upright character based on an original upright character read from a font or the like, a non-upright character of a more accurate size based on a designated magnification is used. Obtainable.

[Brief description of drawings]

FIG. 1 is a block diagram showing a drawing apparatus according to the present invention.

FIG. 2 is a flowchart of a drawing process by a drawing device.

FIG. 3 is a diagram for explaining a designated vector.

FIG. 4 is a diagram showing an example of upright characters stored in a font.

FIG. 5 is a diagram showing an example of a scaled erect character and a scaled non-erect character obtained from the erect character shown in FIG. 4 by the drawing method of the present invention.

FIG. 6 is a diagram showing an example of a scaled erect character and a scaled non-erect character obtained from the erect character shown in FIG. 4 by a conventional drawing method.

FIG. 7 is a block diagram showing a conventional drawing apparatus.

[Explanation of symbols]

2 Drawing device 12 Character size conversion unit (character size conversion means) 13 Coordinate conversion unit (coordinate conversion means) 14 Drawing processing unit (drawing processing means) 15 Bitmap memory CA upright character CB variable magnification erect character CC scaling non-upright characters (non-upright characters)

─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Noriko Shiba 35, Saho, Kato-gun, Hyogo Prefecture (No address) Inside Fujitsu Peripherals Co., Ltd. (72) Yoshiko Ishii 35, Saho, Kato-gun, Hyogo Prefecture (No address) In Fujitsu Peripherals Co., Ltd. (56) References JP-A-2-93591 (JP, A) JP-A-4-255897 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G09G 5/22-5/32

Claims (2)

(57) [Claims] 1. A method for drawing a non-erect character enlarged or reduced to a specified magnification based on original vector data of an upright character, wherein the vector data has a specified magnification. Multiply the value of the ratio of the value that is 1 less than the number of dots when the enlargement process or reduction process is performed and the value that is 1 less than the number of dots of the original erect character, and obtain vector data The obtained vector data of the variable upright character is subjected to coordinate conversion processing for rotation or transformation, and the vector data of the non-upright character is obtained by this, and the vector data of the non-upright character is obtained. A method for drawing a non-upright character, which is characterized by expanding in a bitmap memory based on the above. 2. An apparatus for drawing a non-erect character enlarged or reduced to a specified magnification based on original vector data of an upright character, wherein the vector data has a specified magnification. To obtain vector data of a variable upright character by multiplying it by the ratio of the value that is 1 less than the number of dots when the enlargement process or the reduction process is performed and the value that is 1 less than the number of dots of the original erect character A character size conversion means, and a coordinate conversion means for performing a coordinate conversion process for rotation or deformation on the vector data of the scaled erect character to obtain vector data of a non-erect character; A non-erect character drawing device, comprising: a drawing processing unit that expands in a bitmap memory based on character vector data.