VDU 25
Programmer's Reference Manuals
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» VDU 25
VDU 25 (&19)
Use
Identical in use to BASIC statement PLOT.
Syntax
VDU 25,k,x;y;
Parameters
| k | Plotmode |
| x | x-coordinate |
| y | y-coordinate |
Notes
Use of semi-colon punctuation sends number as two-byte pair: lo followed by hi.
Plotmode specifies what kind of point, line or triangle is to be drawn, as tabulated below.
| Plotmode | Action |
|---|---|
| 0 | Move relative to last point |
| 1 | Draw line relative in the current graphics foreground colour |
| 2 | Draw line relative in the logical inverse colour |
| 3 | Draw line relative in the current graphics background colour |
| 4 | Move to absolute position |
| 5 | Draw line absolute in the current graphics foreground colour |
| 6 | Draw line absolute in the logical inverse colour |
| 7 | Draw line absolute in the current graphics background colour |
| 8 – 15 | As 0 – 7 but with the last point in the line omitted |
| 16 – 23 | As 0 – 7 but with a dotted line |
| 24 – 31 | As 0 – 7 but with a dotted line and without the last point on the line |
| 32 – 63 | Reserved |
| 64 – 71 | As 0 – 7 but only a single point is plotted |
| 72 – 79 | As 0 – 7 but to draw a horizontal line to the left and right of the point until a colour other than the current background colour is reached |
| 80 -87 | As 0 – 7 but plot and fill a triangle |
See also
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