Matrix Orbital GLK12232-25-WBL - Manual (Page 17)

4.2.7 Initialize bar graph (254 103 [ref][type][x1][y1][x2][y2])
This command initializes a bar graph referred to by number [reference number] of type [type] with size
from (x1,y1) (top left) to (x2,y2) (bottom right). A maximum of 16 bar graphs with reference numbers from
0 to 15 can be initialized as;
• [type = 0] Vertical, bottom referenced
• [type = 1] Horizontal left referenced
• [type = 2] Vertical top referenced
• [type = 3] Horizontal right referenced
The bar graphs may be located anywhere on the display, but if they overlap, they will not display properly.
NOTE It is important that [x1] is less than [x2], and [y1] is less than [y2].
This command doesn’t actually draw the graph, it must be ’filled in’ using the “Write to bar graph” com-
mand, described below. The unit saves time by only drawing that part of the bar graph which has changed
from the last write, so the representation on the screen may not survive a screen clear or other corruptive
action. A write of value zero, followed by new values will restore the proper look of the bar graph.
4.2.8 Write to bar graph (254 105 [reference number][value])
Once the bar graph has been initialized it can be ’filled in’ using this command. This command sets the
bar graph [reference number] to value [value]. [value] is given in pixels and should not exceed the available
height / width of the graph. (If it does, the graph will simply be written to its maximum size.)
4.2.9 Display saved bitmap (254 98 [reference number][x][y])
This command causes a previously stored bitmap referenced by [reference number] to be displayed to
the screen at pixel location (x, y) where this location defines the top left corner of the bitmap. Bitmaps and
fonts may use the same reference numbers, for example it is possible to have both a bitmap 1 and a font 1.
NOTE The reference number is established when the bitmap is saved, normally using
mogd.exe.
4.3 Flow Control
The display has built in flow control which is very useful during direct bitmap display and multiple pixel
placement. Flow control is enabled or disabled by two commands. If flow control is enabled, the display
will return an "almost full" message (0xFE) to the micro-controller when its internal buffer fills to a defined
level, and an "almost empty" message (0xFF) when the buffer contents drop to a defined level.
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