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Atari 8-bit Source code
  • Entry name:
     Vibrating Rectangles 
  • Category:
    Graphics
  • Publisher/Developer:
    Rosetta Code
  • Year:
    2021
  • Code:
    amarok
  • Programming language:
    Action!
source: Vibrating Rectangles Vibrating Rectangles Vibrating Rectangles Vibrating Rectangles Vibrating Rectangles Vibrating Rectangles Vibrating Rectangles
Listing 1 
PROC DrawRectangles()
  BYTE i,x1,y1,x2,y2
  
  x1=40 y1=8 x2=119 y2=87
  FOR i=1 TO 20
  DO
    Plot(x1,y1)
    DrawTo(x2,y1)
    DrawTo(x2,y2)
    DrawTo(x1,y2)
    DrawTo(x1,y1)
    x1==+2 y1==+2
    x2==-2 y2==-2
  OD
RETURN

PROC Main()
  BYTE CH=$02FC
  BYTE hue,lum

  Graphics(7+16)
  Color=1
  DO
    IF Color=1 THEN
      Color=2
    ELSE
      Color=1
    FI
    hue=Rand(16)
    lum=Rand(8)*2
    SetColor(Color-1,hue,lum)
    DrawRectangles()
  UNTIL CH#$FF
  OD
  CH=$FF
RETURN
References
https://gitlab.com/amarok8bit/action-rosetta-code/-/blob/master/source/Vibrating_rectangles.act
https://www.rosettacode.org/wiki/Rosetta_Code
https://atariage.com/forums/topic/326941-action-on-rosetta-code/
https://gitlab.com/amarok8bit/action-rosetta-code/-/tree/master
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