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var
g: TGPGraphics;
aCanvas : TCanvas;
p: TGPPen;
procedure TForm1.FormCreate(Sender: TObject);
begin
aCanvas := TCanvas.Create;
aCanvas.Handle:= GetDC(Panel1.Handle);
g:= TGPGraphics.Create(aCanvas.Handle);
p:= TGPPen.Create(aclBlue, 8);
p.SetEndCap(LineCapArrowAnchor);
end;
procedure TForm1.WMPaint(var Msg: TWMPaint);
begin
g.DrawLine(p,10,10,40,40);
inherited;
end;