TITLE
Applesoft: HPLOT TO After a Draw 

Article ID: 44
Created: 9/21/84
Modified: 3/2/98

 

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TOPIC 
The Applesoft DRAW command doesn't set an internal pointer refering to the last 
plotted point, which a HPLOT TO command could use. Instead HPLOT TO X,Y draws a 
line from some random point to X,Y.



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DISCUSSION 

The following program contains a machine language routine which decodes the 
position of the last plotted point, thus allowing HPLOT TO X,Y to draw from this 
location.

10 FOR J=768 TO 780
20 READ A
30 POKE J,A
40 NEXT J
50 DATA 32,203,245,166,224,164,225
60 DATA 165,226,76,17,244
100 SHLOAD
110 HGR
120 HCOLOR=3
130 SCALE=1
140 DRAW 1 AT 100,100
150 CALL 768: REM THIS IS IT!
160 HPLOT TO 10,10
170 END