Radio Shack TRS-80 - Page 40

Computer Graphics Operation Manual
----------TRS-aO ® ----------
pixels in a given row are not altered and the tile that was
to be painted in that row matches the background tile,
painting will continue on to the next row.
Note: BASICG uses Free Memory for tiling.
Examples
l~ CIRCLE (3~~,1~~),1~~
2~ PAINT (3~~,1~~),1,1
Paints the circle in solid white.
l~ CIRCLE (1~~,1~~),3~~
2~ PAINT (l~~,l~~),l,l
Paints the circle. Only the visible portion of the circle
is painted on the screen.
5 A=l
6 SCREEN ~
l~ CIRCLE (32~,12~),1~~
2~ CIRCLE (1~~,1~~),5~
3~ CIRCLE (4~~,2~~),6~
4~ CIRCLE (5~~,7~),5~
5~ PAINT (32~,12~),A,1
6~ PAINT (l~~,l~~),A,1
7~ PAINT (4~~,2~~),A,1
8~ PAINT (5~~,7~),A,1
The tiling style is assigned the value I in line 5 (A=l) for
all PAINT statements. Four circles are drawn and painted in
solid white.
l~ LINE (14~,8~)-(5~~,2~~),1,B
2~ PAINT (26~,12~),CHR$(&HEE)+CHR$(&H77)+CHR$(~~),1
Paints box in specified tiling style using strings.
l~ CIRCLE (3~~,1~~),1~~
2~ PAINT (3~~,1~~),"D",1
This example uses a character constant to paint the circle
in vertical black and white stripes. The character "D" (~l~~
---------lIafilelllaell---------
-38-