All Manuals > CAPI User Guide and Reference Manual > 13 Drawing - Graphics Ports


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) - 25 Feb 2015