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How to prevent that a changing text on the Draw canvas is superimposed on previous text?
The trick is to put Draw.SetBackground in Restore and not in Setup, so that it is called each time the canvas is redrawn!

Hans Klaver
Model is published
Oberon & OberonJSSource code
Result  

check indexes in arrays

Project modules:
InitDocu
Framework modules:
LogDocu
DrawDocu
MathDocu
StringsDocu
FormsDocu
PlotDocu