JP2833101B2 - Pattern deformation method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pattern deformation method capable of deforming compressed outline data with attribute data according to a desired parameter.

[Conventional technology]

As seen in desktop publishing (DTP) in recent years, devices that use computers to achieve print-like image quality and editing functions have begun to be developed. In such an apparatus, since it is desired to handle a wide variety of characters, an outline font that approximates the outline of a character with straight lines and curves and compresses the outline is used as an outline font that can freely change the size of the character. Since outline fonts are calculated by performing linear / curve approximation from coordinate values called control points, high quality can be achieved relatively easily by performing conversion (affine conversion) that performs the same conversion for all coordinate values. Is maintained.

[Problems to be solved by the invention]

However, the affine transformation has a drawback that high-quality deformation cannot be performed to change the line width of characters or other patterns or to convert the outline shape for each part.

There are various types of fonts such as Mincho, Gothic, round Gothic, regular square, textbook, cursive, etc.
There are about 7,000 characters in standard. If all the outline fonts are to be prepared for each character, the development man-hours and data capacity of the outline fonts become enormous, which is uneconomical.

The present invention is intended to solve the above-described problems. For example, the line width of a stroke is changed or the contour shape is changed for each part. For example, a character font is changed from square gothic to round gothic. It is an object of the present invention to provide a pattern deformation method capable of performing such deformation with high speed and high image quality.

[Means for solving the problem]

In the present invention, as shown in FIG.
A memory 2 for storing outline data with attribute data comprising outline data compressed by using a straight line / curve approximation and attribute data relating to the contour line assigned to the control point, and conversion for pattern deformation Parameter setting means 1 for inputting and setting parameters, and enlargement / reduction means 4 for enlarging / reducing the coordinate values of the control points using the conversion parameters input from the parameter setting means 1.
And coordinate value conversion means 5 for converting the coordinate values of the control points using the input conversion parameters and the attribute data given to the control points of the compressed outline data.

[Action]

In the parameter setting means 1, a desired size, line width, or end shape of the brush end for the pattern is set. Outline data obtained by adding attribute data to control points of the outline font is stored in the outline data memory with attributes 2 in advance. Attribute decoding means 3
The attribute data assigned to the control points of the pattern stored in the attributed outline data memory 2 by the setting of the parameter setting means 1 is decoded. Enlargement / reduction means 4
In the parameter setting means 1, when the input setting is enlargement / reduction of a pattern, the parameter setting means 1
The coordinate value of the control point of the contour line in the pattern is converted based on the parameter set in (2), that is, the scaling ratio. When the setting of the parameter setting means 1 is a line width or a shape of a line end, the coordinate value conversion means 5 converts each coordinate value of the control point of the outline font by the set parameter and the attribute decoding means 3. The change is made based on the decrypted outline data and the attribute data.

〔Example〕

An embodiment in which the present invention is applied to deformation of a character pattern will be described with reference to FIGS. In FIG. 2, an outline font data memory with attributes 12 stores coordinate value data of control points related to an outline font and outline data including the attribute data.

The parameter input unit 11 inputs parameters such as an enlargement / reduction ratio for enlarging or reducing the character size, a change ratio for changing the line width of the character, or a deformation ratio for changing the shape of the brush end of the character, for example, an input device such as a keyboard. is there.

The coordinate conversion unit 13 includes an enlargement / reduction register 20, a brush end shape register 21, a line width control register 22, an enlargement / reduction unit 23, a brush end shape conversion unit 24, a line width control unit 25, and an attribute decoding unit 26. The scaling ratio of the character is input to the scaling register 20 from the parameter input unit 11 and the
In the parameter input unit 11, the shape at the end of the character, for example, the designation of a round character or the like and the deformation rate of the brush end are input.
Enter the line width change rate that changes the line width of the character from thick to thin.

The attribute decoding unit 26 decodes the attribute of the outline font control point in the outline font data memory with attributes 12. Based on the attribute data of the control points of the outline font and the parameters stored in the registers, the enlargement / reduction unit 23 enlarges / reduces the coordinate values of the control points of the outline font. By moving the control point, the line width control unit 25 changes the character line width to be thicker or thinner.

The drawing unit 14 includes a contour drawing unit 28 and a filling unit 29. The drawing unit 14 draws the outline of the character based on the coordinate values of the control points of the outline font converted by the coordinate conversion unit 13, and fills the inside with black. The outline font converted in this manner is expanded in the bitmap memory 15 to generate a character pattern.

Next, using the data obtained by approximating the corner Gothic character contour shown in FIG. 3 by a straight line and a Bezier curve and by adding the following attributes, the line width control of the outline font and the stroke An example in which the brush end is transformed into a round Gothic will be described.

It should be noted that two attributes are assigned to one control point in the outline font, and in the future conversion, both attributes will be converted. There are the following seven types of additional attributes.

Upper contour of horizontal stroke Lower contour of horizontal stroke Left contour of vertical stroke Right contour of vertical stroke Edge contour of horizontal stroke (edge becomes horizontal line) Edge contour of vertical stroke (edge Is a vertical line) Attribute of Bezier curve For example, the start point and end point of the top contour line 1 of the character “pressure” in the square Gothic shown in FIG. Since it is an upper contour line, additional attributes are attached to both ends of the contour line 1. The start point of the outline 1 is also provided with an attribute because it is also the outline on the left side of the vertical stroke, and the end point of the outline 1 is provided with an attribute because it is also the outline of the edge of the vertical stroke. Furthermore, the attribute that the contour line 2 at the left end of “pressure” is a Bezier curve that approximates the curve to the left contour of the vertical stroke. The other parts than the lowermost end of the contour 2 are edges of a horizontal stroke, and thus attributes are given. Similarly, the other contour lines are given attributes as shown in FIG.

Then, the parameter input section 11 inputs the following parameters.

Enlargement / reduction ratio a (a <1 for reduction) Brush end shape deformation ratio b (dot number) Line width change number c (dot number, + thick, -narrow) Each parameter a to c converts a character to a desired shape When an arbitrary number is input from the parameter input unit 11, the values are stored in the enlargement / reduction register 20, the brush end shape register 21, and the line width control register 22, respectively.

The enlargement / reduction unit 23 reads the value stored in the enlargement / reduction register 20 and multiplies the coordinate value data of all the control points in the outline font by a.

The brush end shape conversion unit 24 converts the attribute (the outline of the edge of the horizontal stroke) or the attribute (the outline of the edge of the vertical stroke). For example, the attribute (outline of the edge of the horizontal stroke) shown in FIG.

The attribute has both attributes of the edge of the horizontal stroke and the left outline of the vertical stroke or the right outline of the vertical stroke, and is a set of two points.

For the brush end of such an outline font,
As shown in FIG. 4 (b), first, the coordinate value of the control point is moved downward by b dot along the left and right vertical strokes. Next, as shown in FIG. 4C, attribute control points are created at 4 / 3b dots along the extension of the left and right vertical strokes from the newly created control points. As shown in FIG. 4 (d), segments of the Bezier curve are newly created at the four points thus formed. Regarding the attribute, the vertical stroke is changed to the horizontal stroke, and the attribute is similarly converted.

The line width control unit 25 moves the following control point coordinate values for the additional attributes,. That is,
When the line width change number is + c, the attribute representing the upper contour of the horizontal stroke moves the coordinate value of the control point upward by the line width change number c dot. The attribute representing the lower contour of the horizontal stroke moves the coordinate value of the control point downward by the number of knitting width changes c dot. The attribute representing the contour on the left side of the vertical stroke moves the coordinate value of the control point to the left by the line width change number c dot. The attribute representing the outline on the right side of the vertical stroke moves the coordinate value of the control point to the right by the line width change number c dot. The attribute of being a Bezier curve determines the movement amount of the coordinate value of the control point by performing the following calculation based on the attribute of the control point on another contour forming the Bezier curve segment.

For example, as shown in FIG. 5, four control points temporarily forming one Bezier curve, (7-0), (7-1),
Assuming (7-2) and (7-3), the control points having the attributes are (7-1) and (7-2). An expression for obtaining the coordinate value of each control point is as follows.

Movement amount of control point (7-1) = 2/3 (movement amount of 7-0)
+1/3 (movement amount of 7-3) Movement amount of control point (7-2) = 1
/ 3 (movement amount of 7-0) +2/3 (movement amount of 7-3) For example, as shown in FIG. 5, the control point (7-0) moves upward by 0 and moves rightward by 0, When the control point (7-3) moves upward by 0 and moves a to the right by the above equation, the control point (7-3) moves by 2 / 3a above the control point (7-1) and by 1 / 3a in the right direction. 1 / 3a above the control point (7-2) and 2 /
Move 3a.

Movement of the control points as described above is performed for all of the outlines, outlines of the outline font are drawn by the outline drawing unit 28 from the coordinate values of the control points after the movement, and then the inside of the character is drawn by the filling unit 29. Fill it. Then, the converted coordinate values of the control points are developed in the bitmap memory 15 to generate a character pattern.

Next, as another embodiment, FIGS. 6 (a) and 6 (b)
As shown in (1), by changing the way of assigning the attributes of the brush tip shape and the way of moving the control points, the brush tip shape can be sharpened or ruffled.

That is, in the case of sharpening the brush end shape as shown in (a) of FIG. 6 (a), the parameter input unit 11 sets the sharpening of the brush end shape and sets b dot as the sharpening degree. The brush end shape conversion unit 24 is configured as shown in (b) of FIG.
As shown in (c) and (c), a middle point at the end of the left and right vertical strokes and a point lowered by b dot are set as control points in accordance with the parameters. Thereafter, a character pattern is generated in the same manner as described above.

Similarly, in the case where the shape of the brush tip is made rippling, bdot is set as the setting of making the shape of the brush tip rippling and the degree of making the brush tip rippling in the parameter input unit 11. Brush end shape converter 24
As shown in (b) of FIG. 6 (b), as shown in (c) of FIG. b dot
Control points are provided above and below the lowered point and at 1/4 and 3/4 from the left. Then, a Bezier curve is drawn using these four points to generate a brush end shape.

Also, parameters given to the line width control unit 25 are given separately for the horizontal stroke and for the vertical stroke, and the attribute representing the upper contour of the horizontal stroke and the attribute representing the lower contour of the horizontal stroke are horizontal. The attribute representing the left outline of the vertical stroke and the attribute representing the right outline of the vertical stroke are processed using the value of the stroke, and the thickness of each stroke is independently controlled by processing using the value of the vertical stroke. Can be done.

Further, as shown in FIG. 7, by increasing the number of attributes to be given, a process of rounding a corner at which a vertical stroke and a horizontal stroke intersect can be performed.

〔The invention's effect〕

As described above in detail, according to the present invention, control on outline data is performed using parameters set by parameter setting means for converting coordinate values of control points and attributes of outline data provided in advance. Since the coordinate values of the points are changed, a wide variety of patterns such as a pattern in which the stroke width is changed from the outline data of the same pattern and a pattern in which the contour shape is modified for each part can be obtained with high image quality.

Also, in the case of a character pattern, various types of characters can be generated from the same outline font data, so that it is not necessary to prepare various types of outline data, and thus the storage capacity can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram of the present invention, FIG. 2 is a block diagram of an embodiment of the present invention, FIG. 3 is an explanatory diagram of an example of contour approximation data and its attribute values of the present invention, and FIGS. ) Is an explanatory diagram of an operation example of the brush end shape conversion unit, FIG. 5 is an explanatory diagram of the movement amount of the attribute, and FIGS. 6 (a) to (c) and FIGS. 7 (a) to (c) are diagrams of the brush end shape conversion process. FIG. 8 is a diagram for explaining another example, and FIG. 8 is an explanatory diagram of an applied example of a modification by attribute addition. 1 ... Parameter setting means 2 ... Outline data memory with attributes 3 ... Attribute decoding means 4 ... Enlargement / reduction means 5 ... Coordinate value conversion means

Continued on the front page (58) Fields surveyed (Int.Cl. ⁶ , DB name) B41J 2/485 B41J 5/44 G09G 5/24 G09G 5/26

Claims (1)

(57) [Claims] 1. Outline data with attribute data comprising outline data obtained by compressing a contour line of a pattern using a straight line / curve approximation and attribute data relating to the contour line given to a control point thereof. A parameter setting unit for inputting and setting a conversion parameter for pattern deformation; an enlarging / reducing unit for enlarging / reducing a coordinate value of a control point using the conversion parameter input from the parameter setting unit; And a coordinate value conversion unit for converting coordinate values of the control points using the input conversion parameters and the attribute data given to the control points of the outline data.