Get the facecolor of a contourf plot

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Giorgos Papakonstantinou
评论： Johannes Korsawe 2015-1-26
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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回答（1 个）

Doug Hull
Doug Hull 2014-3-11
[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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Kelly Kearney
Kelly Kearney 2015-1-12
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 2015-1-26
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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