VDU 25
From BeebWiki
PLOT commands
| Syntax | VDU 25,<numeric>,<numeric>;<numeric>;
|
| Character stream (hex) | 19 <command> <Xlow> <Xhigh> <Ylow> <Yhigh>
|
| Description | Performs a vector graphics operation. |
Plot Numbers
------------
b0-b1: 00 move
01 plot in current foreground colour
10 plot in logical inverse colour
11 plot in current background colour
b2 : 0 relative coords
1 absolute coords
b6-b7=00 - draw line:
b3 : 0 last point not omitted
1 last point omitted
b4 : 0 solid line
1 dot-dash line
b5 : 0 first point not omitted
1 first point omitted
b6-b7<>00:
40 Plot point
48 Fill to non-background
50 Fill triangle
58 Fill to background
60 Fill rectangle
68 Fill to foreground
70 Fill parallelogram
78 Fill to non-foreground
80 Flood to non-background
88 Flood to foreground
90 Circle outline
98 Circle fill
A0 Circle arc
A8 Circle segment
B0 Circle sector
B8 Block copy/move/swap:
b0-b1: 00 no action
01 copy
10 move
11 swap (copy and move)
C0 Ellipse outline
C8 Ellipse fill
D0 Font plot
D8 Reserved
E0 Reserved
E8 Sprite plot (BBFW: block swap)
F0 User plot
F8 User plot
PLOT k,x,y -> VDU 25,k,x;y;
MOVE x,y -> PLOT 4,x,y
DRAW x,y -> PLOT 5,x,y
CIRCLE x,y,r -> MOVE x,y:PLOT 145,r,0
CIRCLE FILL x,y,r -> MOVE x,y:PLOT 153,r,0
DRAW BY x,y -> PLOT 1,x,y
ELLIPSE x,y,a,b -> MOVE x,y:PLOT 0,a,0:PLOT 193,0,b
ELLIPSE FILL x,y,a,b -> MOVE x,y:PLOT 0,a,0:PLOT 201,0,b
FILL x,y -> PLOT 133,x,y
FILL BY x,y -> PLOT 129,x,y
LINE x1,y1,x2,y2 -> MOVE x1,y1:DRAW x2,y2
MOVE BY x,y -> PLOT 0,x,y
PLOT x,y -> PLOT 69,x,y
PLOT BY x,y -> PLOT 65,x,y
RECTANGLE x,y,w,h -> MOVE x,y:PLOT 13,x+w,y:PLOT 13,x+w,y+h:PLOT 13,x,y+h:PLOT 13,x,y
RECTANGLE FILL x,y,w,h -> MOVE x,y:PLOT 101,x+w,y+h
RECTANGLE FILL x1,y1,w,h TO x2,y2 -> MOVE x1,y1:MOVE x1+w,y1+h:PLOT 189,x2,y2
RECTANGLE SWAP x1,y1,w,h TO x2,y2 -> MOVE x1,y1:MOVE x1+w,y1+h:PLOT 191,x2,y2
RECTANGLE x1,y1,w,h TO x2,y2 -> MOVE x1,y1:MOVE x1+w,y1+h:PLOT 190,x2,y2
