Matrix-orbital GLK19264-7T-1U Manual de usuario descargar pdf (Pagina 25)

(b) Height (1 byte)

(d) ASCII End Value (1 byte)

2. Character Table (3 bytes for every character between the ASCII Start and End values inclusive)

(a) High Offset MSB (1 byte)

(b) Low Offset LSB(1 byte)

3. Bitmap Data

5.1.2 Creating a Font

The following is an example of how to create a font ﬁle for the letters h, i and j.

First you must create the bitmaps containing the character data in bitmap form. Figure 21 below illus-

trates the bit pattern for the h, i and j bitmap data.

Figure 21: Bitmaps for h, i, and j

Second you may begin to create the font ﬁle starting with the header. The header will contain the nominal

width, the height and the ASCII start and end values inclusive that you wish to create characters for.

Table 8: Font File Header

Nominal Width Height ASCII Start Val ASCII End Val

0x05 0x07 0x68 0x6A

Next we will have to ﬁnd out how many bytes each character will use up, in order to create the character

table. The bitmaps are encoded horizontally and may have variable widths, h has a width of ﬁve, i a width

of three and j a width of four, see the ﬁgure below for an example of encoding the ﬁrst letter h:

Bitmap Data Byte Hex Value

1 0 0 0 0

1 0 0 0 0 10000100 0x84

1 0 1 1 0 00101101 0x2D

1 1 0 0 1 10011000 0x98

1 0 0 0 1 11000110 0xC6

1 0 0 0 1 00100000 0x20

1 0 0 0 1

Figure 22: Bitmap Encoding

Matrix Orbital GLK19264-7T-1U 20

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 70 71

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Matrix-orbital GLK19264-7T-1U Manual de usuario Pagina 25