Matrix Orbital VK204-25 Legacy - Manual (Page 22)

5.1.3 Draw vertical bar graph (254 61 [column] [height])
Draws a vertical bar graph in [column] having a height of [height] pixels. The height may range from
0 to 20 (0x00 to 0x14) pixels. The necessary characters must first be initialized by either of the commands
shown in section 5.1.1 or 5.1.2, which will determine the width of the graph drawn. Graph may be erased
by drawing a bar graph of height = 0 in the same column.
5.1.4 Initialize horizontal bar graph (254 104)
This command defines the 8 special / user characters to be blocks suitable for use in drawing horizontal
bar graphs. Any previously existing definitions will be lost. Once this command has been issued, any number
of horizontal bar graphs may be drawn unless the characters are redefined by another command.
5.1.5 Draw horizontal bar graph (254 124 [column] [row] [dir] [length])
Draws a horizontal bar graph in [row] starting at [column] with a length of [length] pixels. [row] may
have a value of 0x01 or 0x02, column may range from 0x01 to 0x14 and length may be from 0x00 to 0x64
(0 to 100) if the graph can extend the full width of the screen. Each column is 5 pixels wide (spaces between
the columns don’t count).
[dir] specifies the direction: 0x00 goes from left to right, 0x01 goes from right to left.
5.1.6 Define custom character (254 78 [c] [8 bytes])
The display allows up to 8 user defined (custom) characters. These characters occupy the first 8 (0x00
to 0x07) places in the character set.
Custom characters occupy a 5x8 pixel matrix. Built in characters are 5x7: the bottom row of pixels is
normally reserved for the underline cursor. The underline cursor should be turned off if the bottom row of
pixels forms part of a custom character.
The characters are defined by issuing the command 254 78 [c] followed by 8 bytes to define the character.
[c] is the character number (0x00 to 0x07). The 8 bytes are mapped as shown below;
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