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Topic: contour serie (Read 3063 times)
apeoperaio
Sr. Member
Posts: 273
contour serie
«
on:
November 03, 2014, 11:23:19 am »
Is it possible with TAChart to draw a contour plot?
http://en.wikipedia.org/wiki/Contour_line
Thanks,
Andrea
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jwdietrich
Hero Member
Posts: 1232
Re: contour serie
«
Reply #1 on:
November 03, 2014, 11:33:31 am »
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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function GetRandomNumber: integer; // xkcd.com
begin
GetRandomNumber := 4; // chosen by fair dice roll. Guaranteed to be random.
end;
http://www.formatio-reticularis.de
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wp
Hero Member
Posts: 11916
Re: contour serie
«
Reply #2 on:
November 03, 2014, 01:55:23 pm »
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.
«
Last Edit: November 03, 2014, 01:57:13 pm by wp
»
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apeoperaio
Sr. Member
Posts: 273
Re: contour serie
«
Reply #3 on:
November 05, 2014, 12:17:33 pm »
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
Hero Member
Posts: 11916
Re: contour serie
«
Reply #4 on:
November 05, 2014, 01:00:27 pm »
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.
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