Bounce Example
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to setup clear-all set-default-shape turtles "circle" draw-walls crt 5 ;; create some turtles [ randomize ] ;; place them randomly reset-ticks end ; draws the boundaries (walls) of the "billiard table" to draw-walls ; draw left and right walls ask patches with [abs pxcor = max-pxcor] [ set pcolor blue ] ; draw top and bottom walls ask patches with [abs pycor = max-pycor] [ set pcolor blue ] end ; set random location to randomize setxy random-xcor random-ycor if pcolor = blue ; if it's on the wall... [ randomize ] ; ...try again end to go ask turtles [ ifelse leave-trace? ;; the turtle puts its pen up or down depending on the [ pd ] ;; value of the LEAVE-TRACE? switch [ pu ] bounce fd 0.1 ] tick end ;; this procedure checks the coordinates and makes the turtles ;; reflect according to the law that the angle of reflection is ;; equal to the angle of incidence to bounce ;; turtle procedure ; check: hitting left or right wall? if abs [pxcor] of patch-ahead 0.1 = max-pxcor ; if so, reflect heading around x axis [ set heading (- heading) ] ; check: hitting top or bottom wall? if abs [pycor] of patch-ahead 0.1 = max-pycor ; if so, reflect heading around y axis [ set heading (180 - heading) ] end ; Public Domain: ; To the extent possible under law, Uri Wilensky has waived all ; copyright and related or neighboring rights to this model.
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Attached files
File | Type | Description | Last updated | |
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Bounce Example.png | preview | Preview for 'Bounce Example' | over 11 years ago, by Uri Wilensky | Download |
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