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Bug 2424
| Summary: | Painting is 15 times slower with this option enabled | ||
|---|---|---|---|
| Product: | VCL TeeChart | Reporter: | alex <ushastik-007> |
| Component: | Chart | Assignee: | Steema Issue Manager <issuemanager> |
| Status: | RESOLVED NOTABUG | ||
| Severity: | normal | CC: | yeray |
| Priority: | --- | ||
| Version: | 17.160426 | ||
| Target Milestone: | --- | ||
| Hardware: | PC | ||
| OS: | Windows | ||
| Chart Series: | --- | Delphi / C++ Builder RAD IDE Version: | |
| Attachments: | painting time ms x10 | ||
Non solid lines are very slow in GDI+ (and also GDI) compared to solid lines. We recommend using TFastLineSeries for intensive drawing, which includes features to improve the drawing performance. - DrawStyle property set to flAll Series1.DrawStyle := flAll; Series1.Pen.Style:=psSolid; - You might also try disabling AntiAlias. This can be done in two ways: 1) At Chart level: (Chart1.Canvas as TGDIPlusCanvas).AntiAlias:=False; 2) At FastLine series level: Series1.FastPen := True; - You can also use DrawAllPointsStyle daMinMax: Series1.DrawAllPoints:=false; Series1.DrawAllPointsStyle:=daMinMax Good to hear you're aware. By the way, is there a TFastPoint series? Like FastLine, but with points? No, I'm afraid there's no TFastPointSeries: http://bugs.steema.com/show_bug.cgi?id=1746 |
Created attachment 962 [details] painting time ms x10 Hi! Is there something special about SmallDots pen style? Cause it makes TChart 15 times slower. These are the requirements: Axis.Grid.SmallDots must be enabled. The renderer must be GDI+ The anti-aliasing must be enabled, that's important. Also: Delphi 10.4, 32 bit Windows compiler. TChart 17.160129 (the default included) Windows 7. And the code: procedure TForm1.Button_test_Click(Sender: TObject); begin chart1.Series[0].FillSampleValues(10); // TPointSeries t:=gettickcount; for var i:= 1 to 10 do chart1.Repaint; caption:=(GetTickCount - t).ToString; end; procedure TForm1.Button_MakeItSlow_Click(Sender: TObject); begin chart1.LeftAxis.Grid.SmallDots:=true; chart1.BottomAxis.Grid.SmallDots:=true; end; Make TChart big enough to see the slowdown. In my case it's fullscreen and normally the painting process takes 10 ms. With SmallDots it's 150 ms.