Hi.
When drawing points on a line graph, is it possible, via code, to make the points round and without a black boarder?
Could someone give me any code examples please?
Thanks
Richard
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I suppose you use a TLineSeries, but the same principle should work for TBSplineSeries and TCubicSplineSeries

Chart1LineSeries1.Pointer.Style := psCircle;         // round points
Chart1LineSeries1.Pointer.Pen.Style := psClear;    // no border

?Thanks Werner.
That's interesting,
?
Chart1LineSeries1.Pointer.Style := psCircle;
Doesn't compile, but I can navigate to it at design time?

  chartMain.ClearSeries;
  FLine := TLineSeries.Create(chartMain);
  FLine.Marks.Style := TSeriesMarksStyle(4);
  FLine.Marks.OverlapPolicy := opHideNeighbour;
  FLine.ShowLines := true;
  FLine.ShowPoints := true;
  FLine.Pointer.Brush.Color := clBlue;
  FLine.Pointer.Style := psCircle; <---- this line won't compile

Richard

?
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Oh - the old "uses" issue... "psCircle" is declared in unit TATypes which is not added to "uses" designtime, just use the ObjectInspector: The tree above the Object Inspector shows the chart and the series as a child of the chart. Click on the series to brings the series properties into the Object Inspector. Scroll down a bit to see the "Pointer" property, open the node and find the "Style".

Maybe you are interested also in my forum posting of today containing a lot of TAChart runtime code:
http://forum.lazarus.freepascal.org/index.php/topic,28628.msg179298.html#msg179298

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Hi,
Another quick question. How can you, via code, zoom out of a chart, effectively back to what it was by default? If that makes sense?

Thanks

Richard
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The rectangle enclosing the shown data range is called the LogicalExtent of the Chart. Therefore, store the LogicalExtent before performing a zoom in a TDoubleRect (savedExtent := Chart.LogicalExtent), and to go back you just assign it the other way: Chart.LogicalExtent := savedExtent. (The unzoomed extent already is available as "Chart.GetFullExtent").

All this is managed by the TChartExtentHistory. Details are explained in the Mandelbrot-Tutorial
(http://wiki.lazarus.freepascal.org/TAChart_Tutorial:_ColorMapSeries,_Zooming#Zoom_history).

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And I forgot to mention that you can unzoom in the standard configuration by just clicking into the chart

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Maybe

TChart.ZoomFull

can help you

2015-06-04 21:35 GMT+02:00 Richard Mace :

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Thanks, that worked a treat.

Richard

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