I have a filled 2-D patch object as a figure, for example like this one:
Now I would like to draw level lines into this image, which limits areas of different values (color values). Furthermore I would like to set the number of level lines on my own (1 line, which separates 2 areas; 2 lines, which separate 3 areas; etc...).
I know there is the 'contour' or 'contourf' commands, which deal with my issue. But in my case I have a patch image and would like to keep this image and just draw the level lines into this image.
The patch object is of this form: 'patch(X,Y,C,'PropertyName',propertyvalue...)'
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