contour serie

[apeoperaio]

Is it possible with TAChart to draw a contour plot?
http://en.wikipedia.org/wiki/Contour_line
Thanks,
Andrea

[jwdietrich]

Depending on your requirements, a ColorMap might be sufficient for your application, see http://wiki.freepascal.org/TAChart_Tutorial:_ColorMapSeries,_Zooming for details. However, a ColorMap isn't the same as a contour plot.

You might therefore consider to define a function series linked to a TParametricCurveSeries handler. With this technique it should be possible to implement a real contour plot. A possible result is the third example at http://wiki.freepascal.org/TAChart_Demos#func.

[wp]

Look at this old thread: http://forum.lazarus.freepascal.org/index.php/topic,19399.msg114039.html. It contains a "contour finder" class plus example for TAChart.

[apeoperaio]

I had look at the thread, is it implemented in tachart? Since I didn't find ant contour unit in the tachart package.

[wp]

You are right, TAChart does not contain any contour units. But the attachment in one of the postings of the thread contains a complete demo project which shows how you can extend TAChart to draw contours.