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Bug 2483 - Zoom rectangle not following mouse in OpenGL
Summary: Zoom rectangle not following mouse in OpenGL
Status: CONFIRMED
Alias: None
Product: VCL TeeChart
Classification: Unclassified
Component: OpenGL 3D (show other bugs)
Version: unspecified
Hardware: PC Windows
: --- enhancement
Target Milestone: ---
Assignee: Steema Issue Manager
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2021-11-10 09:14 EST by yeray alonso
Modified: 2021-11-10 09:14 EST (History)
1 user (show)

See Also:
Chart Series: ---
Delphi / C++ Builder RAD IDE Version:

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Description yeray alonso 2021-11-10 09:14:34 EST 
The Zoom rectangle looks accurate when the chart is 2D and there's no zoom, or when the mouse is in the center of the chart.
However, there seems to be some offset when having:

- Chart in 2D with some zoom:

uses Series, TeeGLCanvas;

procedure TForm1.FormCreate(Sender: TObject);
begin
  Chart1.Canvas:=TGLCanvas.Create;
  Chart1.Legend.Hide;

  Chart1.View3D:=False;
  Chart1.Aspect.Zoom:=70;

  Chart1.AddSeries(TLineSeries).FillSampleValues(5);
end;

- Chart in 3D:

uses Series, TeeGLCanvas;

procedure TForm1.FormCreate(Sender: TObject);
begin
  Chart1.Canvas:=TGLCanvas.Create;
  Chart1.Legend.Hide;

  Chart1.Aspect.Orthogonal:=False;

  Chart1.AddSeries(TLineSeries).FillSampleValues(5);
end;

Note how the zoom rectangle coordinates look quite correct when the mouse is near the center of the chart, but gets worse as you move to the edges.