graphics output (Program Bug and Problems)

by fsopho ⌂ @, Brazil, Saturday, January 21, 2012, 00:35 (2923 days ago)

when I change the program for the graphics output area, more specifically, the values of the variables of a rectangle or a circle, no change occur in the graphics output. Sometimes, I write first something as the following:

color black
circle 90, 80, 120

Then, the graphics output is correctly represented. But it is only in the first time. If I change the value of x, y, or radius, the previous image keeps being showed. What's the matter?

Thanks for any help!

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