contour serie
lazarus / 55-TAChart

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apeoperaio · 2014-11-03 10:23

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

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jwdietrich · 2014-11-03 10:33

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.

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wp · 2014-11-03 12:55

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.

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apeoperaio · 2014-11-05 11:17

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

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wp · 2014-11-05 12:00

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.