How to draw contour lines into a filled 2-D patch object?

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Paul 2013-1-16

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https://ww2.mathworks.cn/matlabcentral/answers/58942-how-to-draw-contour-lines-into-a-filled-2-d-patch-object

Hallo!

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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Answer 1

Jan 2013-1-16

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https://ww2.mathworks.cn/matlabcentral/answers/58942-how-to-draw-contour-lines-into-a-filled-2-d-patch-object#answer_71314

What about drawing a contour plot on top of this patch?

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Paul 2013-1-16

The problem is:

When I use contour(Z) or contourf(Z), I need a matrix Z, which is a n-m-Matrix containing the values. Now how to transform my patch object into a matrix Z? Or how can contour be used on a patch?

Jan 2013-1-17

contour cannot be used on a patch, but only in the same axes as the patch, such that the drawing appear on top of each other. You do not have to convert a patch in a matrix, but you need the values only. And these values should be available, when you create the patch object.

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