Thanks Narcís. I am never against a workaround as long as there are plans to pave the straight path

Thanks Narcís, clearing the series with the recommended Delete removed everything successfully, so there are no more rogue calls to GetMarkValue.
I still think that Series1.Clear should do the same or am I missing something here?

I have a TContourMap series and a TMarkTipsTool (no Series assigned, i.e. works with all series). While the contour map is empty, everything is fine. Next I add data to the contour map. Everything is fine. Now if I clear the contour map (Active := false; Clear;), subsequent mouse moves will attempt ...

There is a possible unintended dependency between the chart image's axis orientation and the image's appearance. If the axis is inverted, the image is flipped. If this is a desirable effect, it should be at least made optional, so that if an image is placed on the chart based on axes that are invert...

Solved my own problem :) var tmpBitmap: TBitmap; r: TRect; begin if dlgSaveGIF.Execute then with TGIFExportFormat.Create do try Panel := chBaseMap; //The key is to create TGIFImage and then set ColorReduction with TGIFImage.Create do begin DitherMode := dmNearest; Compression := gcLZW; ColorReductio...

Thanks Marjan,
I knew that the AnySeriesHasLessThan was good for something, just had no time to figure out the details. Wil fix my source code

In a chart with two series (one has several points, the other has perhaps two points), the bottom axis behavior is incorrect. This is most noticable when the x values are in the range of 0 to 1. The culprit seems to be the AnySeriesHasLessThan function, which causes CalcLabelsIncrement to return 1, ...

When I attempt to export a chart to GIF, I get "Color table overflow". Here is the code: with TGIFExportFormat.Create do try Panel := SomeChart; SaveToFile('SomeFilename.gif'); finally Free; end; However, the same chart exports just fine when using TeeExport. This happens in 32 and 24 bit screen res...

The UpLeftZooms property of TTeeZoom is described inaccurately in help. In addition, it is impossible to unzoom if the zoom direction is set to tzdVertical. To make unzoom work again, I modified TCustomChart.MouseUp in Chart.pas. IMHO the help topic should be modified to something like this: Gets or...

I came here to read about the ill effect of contour series, although my experience is in Delphi 7 with TeeChart 7.02 Pro. First an application written in D7/TeeChartPro601 showed contours perfectly, but the same code fails to show contours after moving to 702. Then I found that a new application wit...