Get canvas pixel color

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Peter Carr
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Get canvas pixel color

Post by Peter Carr » Fri Mar 10, 2017 12:35 am

I am trying to obtain a pixel color in the OnAfterDraw event with

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X := Chart1.BottomAxis.CalcPosValue(XCoord);
Y :=Chart1.LeftAxis.CalcPosValue(YCoord);
AColor:=Chart1.Canvas.Pixels[X,Y];
But this always returns claWhite even though I have applied color fill with the Series Region Tool during the plotting.

Yeray
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Re: Get canvas pixel color

Post by Yeray » Mon Mar 13, 2017 9:30 am

Hello,

We can't map the pixels as we are drawing elements directly in the canvas.
If you activate UseBuffer to use an internal bitmap, then it should work:

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Chart1.Canvas.UseBuffer:=True;
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