Radio Shack TRS-80 - Chapter 4: Exponential Notation; Exponential Notation

Computer Graphics Operation Manual
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4 SCREEN ~
5 CLR
l~ FOR X=l~ TO 2~~ STEP l~
2~ CIRCLE (3~~,1~~),X,1",.9
3~ NEXT X
4~ FOR Y=l~ TO 2~~ STEP l~
5~ CIRCLE (3~~,1~~),Y,1",.1
6~ NEXT Y
7~ FOR Z=l~ TO 2~~ STEP l~
8~ CIRCLE (3~~,1~~),Z,1",.5
9~ NEXT Z
l~~ GOTO 5
A set of 2~ concentric ellipses is drawn with a major axis
on Y, a set of 2~ concentric ellipses is drawn with a major
axis on X, and a set of 2~ concentric circles is drawn. The
ellipses and circles in each of the three groups are
concentric and the radius varies from l~ to 2~~.
CLR
Clears the Graphics Screen
CLR clears the Graphics Screen.
Example
l~ SCREEN ~
2~ CIRCLE(32~,l2~),1~~,l
This program line will draw a circle. Now type:
CLR <ENTER>
and the Graphics Screen will be cleared but the Text Screen
will remain unchanged. This can be seen by typing:
SCREEN 1
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