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Reference for unit 'Controls' (#lcl)

TGraphicControl.Canvas

A clipping window to the parent canvas.

Declaration

Source position: controls.pp line 1993

public property TGraphicControl.Canvas: TCanvas read FCanvas;

The TGraphicsControl.Canvas is a clipping window to the parent canvas.

If you ask for the Canvas.Width or Canvas.Height, you are actually getting the parent control's Canvas dimensions.

To get the dimensions of the TGraphicControl, you must query the ClientRect.