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delphiteechartdelphi-xe4

Teechart :How to move a visible series mark by code?

In a TLineSeries called serie1 with parent chart cht1, where I have visible marks, I'm trying to move one mark by code. My problem is that when I try to set mark position's Custom property to true, I get an "access violation" exception. But, if I drag the mark (with a TDragMarksTool attached to the chart and active) it moves. After that, "custom" position is true and I can move the mark by code.

This in one button's click event. 

serie1.Marks[10].Visible:=True;
serie1.Marks.Positions.Position[10].Custom:=true; <<< Exception here.

I'm using Delphi XE4 and Teechart 2014, don't have my laptop here to see the exact version numbers.

Solution

  • Some properties aren't initialized until the chart has been entirely drawn.
    Try forcing a chart repaint calling cht1.Draw; before accessing serie1.Marks.Positions.Position array.