Finding and settin plot width
lazarus / 55-TAChart

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mtanner · 2021-01-05 08:45

I have a simple TChart, with a TShape underneath. I want to align the
left and right of the TShape with the left/right of the TChart plot
area (that is excluding the vertical scale labels). Is there a simple
way of finding/setting the width of the TChart plot area?

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wp · 2021-01-05 10:09

There is a Chart.ClipRect, but this may change while the chart is
drawn. The safest way, in my opinion, is to use the chart's
CurrentExtent and convert it to screen coordinates. The CurrentExtent
is a TDoubleRect defined by the left/bottom and right/top intersection
of the axis lines. Units are the internal "graph" units which are
mostly equal to the units plotted on the axes. Conversion can be done
by the chart's GraphToImage functions.

Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i uses 
TAChartUtils;  // for TDoubleRect; function GetChartAxisRect(AChart:
TChart): TRect;var  ext: TDoubleRect;begin  ext :=
AChart.CurrentExtent;  Result.Left := AChart.XGraphToImage(ext.a.x); 
Result.Right := AChart.XGraphToImage(ext.b.x);  Result.Top :=
AChart.YGraphToImage(ext.b.y);  Result.Bottom :=
AChart.YGraphToImage(ext.a.y);end;