About-Defining-a-Big-Font

About Defining a Big Font

    About Defining a Big Font

    Special codes in the first line of a Big Font file specify how to read two-byte hexadecimal
    codes.

    A font with hundreds or thousands of characters must be handled differently from
    a font containing the ASCII set of up to 256 characters. In addition to using more
    complicated techniques for searching the file, the program needs a way to represent
    characters with two-byte codes as well as one-byte codes. Both situations are addressed
    by the use of special codes at the beginning of a Big Font file.

    The first line of a Big Font shape definition file must be as follows:

    *BIGFONT nchars,nranges,b1,e1,b2,e2,...

    nchars represents the approximate number of character definitions in the set; if it is off
    by more than about 10 percent, either speed or file size suffers. You can use the
    rest of the line to name special character codes (escape codes) that signify the start
    of a two-byte code. For example, on Japanese computers, Kanji characters start with
    hexadecimal codes in the range 90-AF or E0-FF. When the operating system sees one
    of these codes, it reads the next byte and combines the two bytes into a code for
    one Kanji character. In the *BIGFONT line, nranges tells how many contiguous ranges of numbers are used as escape codes; b1 , e1 , b2 , e2 , and so on, define the beginning and ending codes in each range. Therefore, the header
    for a Japanese Big Font file might look like this:

    *BIGFONT 4000,2,090,0AF,0E0,0FF

    After the *BIGFONT line, the font definition is just like a regular text font, except that character
    codes (shape numbers) can have values up to 65535.

    Learning AutoCad

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