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Get the facecolor of a contourf plot

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Giorgos Papakonstantinou
Giorgos Papakonstantinou on 10 Mar 2014
Commented: Johannes Korsawe on 26 Jan 2015
I would like to find the facecolor of the the contourf patches. For example if :
[X,Y,Z] = peaks;
figure
contourf(X,Y,Z,4)
I would like to get the 5 different facecolors of the patches of the contour.
Thank you

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Answers (1)

Doug Hull
Doug Hull on 11 Mar 2014
[X,Y,Z] = peaks;
[l, h] = contourf(X,Y,Z,4)
hp = get(h,'children')
get(hp,'cdata')
colorbar
This gets you the value of the cdata. Look at the colormap to get the actual RGB color. Look at the colorbar to see what those values correspond to.

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Kellen
Kellen on 12 Jan 2015
Any ideas on how to do this in 2014b, in which the cdata field no longer exists?
Kelly Kearney
Kelly Kearney on 12 Jan 2015
On the plus side, the new version stores the exact color value, so you don't need to use the color interpolation trick. On the down side, the properties are buried under a few layers of undocumented properties, so this may change down the road:
[X,Y,Z] = peaks;
[l, h] = contourf(X,Y,Z,4);
rgba = double(cat(2, h.FacePrims.ColorData))./255;
col = rgba(1:3,:)';
Johannes Korsawe
Johannes Korsawe on 26 Jan 2015
Kelly, is there some undocumented chance for some magic to set some FaceAlpha-Values for the plotted areas of the contourf-command?

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