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13.5 How to draw to an on-screen port

Drawing on an output-pane should almost always happen only inside its display-callback . See output-pane for more information about this initarg.

If you want to display from outside the display-callback then you should call invalidate-rectangle, which will cause the display-callback to be called.


CAPI User Guide and Reference Manual (Windows version) - 3 Aug 2017

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