JPH04321099A - Character display device for bit map display - Google Patents

Abstract

PURPOSE:To obtain a character display of optional size by using bit data corresponding to one kind of font size. CONSTITUTION:A character string consisting of one kind of bit data is stored in a character data storing part 3, the bit data are read out from the storing part 3 by a character display function part 2 in accordance with a character display command, and at the time of developing the bit data to a bit map, a display ratio converting part 4 expands/contracts bit digits and bit positions and displays the expanded/contracted results on a display device.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a character display device for a bitmap display.

0002

2. Description of the Related Art A bitmap display has the configuration shown in FIG. The character display command is made into display position coordinates X and Y on the X and Y axes of the display device 1 such as a CRT, and one or more character string codes to be displayed from the display position. This character display command is given to the character display function section 2, which obtains bit data of each character from the character data storage section 3 and performs bitmap expansion.

The character data stored in the character data storage section consists of an identifier for each character corresponding to a character string code and bit data. For example, the bit map and bit data of the character "A" have the relationship shown in FIG. . The character display function unit 2 obtains bit data from the correspondence of identifiers for each character code of the character string of the character display command, and performs bitmap expansion.
A font is generated for each dot of the display device 1.

0004

[Problem to be solved by the invention] In conventional bitmap displays, the size of displayed characters is determined by bit data, and in order to display characters of different sizes, bit data corresponding to the size must be prepared. . For example, in the case of Japanese, the font has bit data for full-width characters and half-width alphanumeric kana characters, and by limiting the display to three types of character sizes: these two types of character display plus double-width characters enlarged vertically and horizontally. There is only one size.

[0005] For this reason, in order to display characters of any size, it is necessary to prepare a wide variety of font sizes, and a storage device with a very large capacity is required.

An object of the present invention is to provide a character display device that can display characters of any size using bit data of one type of font size.

[0007]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides a character data storage unit that stores an identifier of a character string and bit data of the character, and a character data storage unit that stores an identifier of a character string and bit data of the character, and a character code that stores the XY coordinate position and character code of a display device. and a character display function section that reads bit data of a corresponding character from the character data storage section when a character display command included in a parameter is given, develops the bit data into a bitmap, and supplies the bit data to the display device as a display font. In a character display device of a bitmap display, when a display ratio parameter is added to the character display command, the bit digit of the bitmap is expanded or reduced in accordance with the display ratio, and the bit position of the bitmap is set to an integer. The present invention is characterized in that it includes a display ratio converting section that converts the font data into font data for the display device by enlarging or reducing the font data.

[0008]

[Operation] According to the present invention, when a conversion ratio is specified for bitmap data converted by the character display function section, the display ratio conversion section enlarges and reduces the bit digits and bit positions of the bitmap, respectively. This allows you to display enlarged or reduced characters. This provides a character display device in which the size of displayed characters can be arbitrarily set according to the conversion ratio, and only one type of character data is required.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing an embodiment of the present invention. The difference between this figure and FIG. 3 is that a display ratio parameter is added to the character display command, and a display ratio conversion unit 4 is provided for converting bitmap data in accordance with the display ratio for the character display function unit 2. It is in.

When the character display function unit 2 enlarges and converts the bit data retrieved from the character data storage unit 3, the display ratio conversion unit 4 increases the bit digits of the bitmap in proportion to the conversion ratio, and Constrain the bit position of bitmap data to an integer and lengthen it proportionally. Conversely, in the case of reduction conversion, the digits of the bitmap are thinned out, and the bit positions of the bitmap data are reduced in proportion.

FIG. 2 shows an example of enlargement/reduction conversion by the display ratio converter 4. The bitmap and font of the character "A" is 8×8, but it is enlarged to 1.5 times and 0. ．．
It is shown in the font when it is reduced 75 times. Enlargement is determined by increasing the vertical and horizontal bit digits to 8×1.5=12 bits, multiplying the vertical and horizontal positions of each font by an expansion ratio of 1.5, and rounding the result to an integer. For example, font F1 has an X coordinate of 4.
, the Y coordinates are at 0, so the XY coordinates are (6, 0). Furthermore, since the XY coordinates of font F2 are at (3, 1), the enlarged XY coordinates are (5, 2).

On the other hand, in reduction, the vertical and horizontal bit digits of the original bit data are reduced to 8×0.75=6 digits. For this reduction, duplicate digits are removed by rounding. In the case shown, digit 2 (
2×0.75=1.5≒2) and digit 3 (3×0.75=2
．． 25≒2) is duplicated, so digit 3 is thinned out, and similarly, digit 6 and digit 7 are duplicated, so digit 7 is thinned out. Next, each font position is determined by multiplying the reduction ratio by 0.75 and rounding the result to an integer. For example, font F1 is 4 in the X coordinate.
×0.75=3, and the Y coordinate becomes 0×0.75=0. Also, since the X coordinate of font F2 is digit 3, it is thinned out from the bitmap in advance, and font F3 is similarly thinned out from the bitmap.
, F7, etc. are thinned out, and the positions of the remaining fonts are determined by rounding and converting to integers.

The conversion function of the display ratio conversion section 4 can be configured to directly perform enlargement and reduction conversion when converting bit data into a bitmap in the character display function section, so that equivalent effects can be obtained.

[0014]

As described above, according to the present invention, bit digits are expanded or reduced and bit positions are expanded or reduced in accordance with the display ratio when bit data is developed into a bitmap. Characters of any size can be displayed while reducing the amount of data by preparing one type of bit data for each character in the storage unit.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing the mode of enlargement and reduction conversion in the embodiment.

FIG. 3 is a configuration diagram of a conventional bitmap display.

FIG. 4 is a relationship diagram between a bitmap and bit data.

[Explanation of symbols]

1...Display device, 2...Character display function section, 3...Character data storage section, 4...Display ratio conversion section.

Claims (1)

[Claims] 1. A character data storage unit that stores an identifier of a character string and bit data of the character, and a character data storage unit that stores the character data storage unit when a character display command having an XY coordinate position of a display device and a character code as parameters is given. In a character display device of a bitmap display, the character display device is equipped with a character display function portion that reads bit data of a corresponding character from a portion, develops it into a bitmap, and provides it to the display device as a display font. When a parameter is added, the bit digits of the bitmap are enlarged or reduced in accordance with the display ratio, and the bit positions of the bitmap are converted into integers and enlarged or reduced to be used as font data for the display device. A character display device for a bitmap display, characterized by comprising a ratio conversion section.