Hello, Usually, with 2D plotting, when I want to cancel a line or a curve among other drawings, I draw the same line or curve (same color) with XOR operator. The pixels change to the background color so the drawing is no more visible.
With Gnoga, two thin lines of pixels remains visible, see attached screen capture.
The corresponding source code is in attached text file.
essai6.adb
Description: Binary data
Build and run, a thick line is drawn. By pressing the XOR button, the line is another time drawn with XOR operator. Two thin lines remains. Where am I wrong? Thanks, Pascal. http://blady.pagesperso-orange.fr
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