How do I change the colors of circles that I draw using the viscircles function?

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Sandip Roy 2017-6-29

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评论： Walter Roberson 2018-3-1

I'm trying to draw circles in an image whereby if the circles' radii are outside a particular threshold, they get colored in with a different color. However, I keep getting an error when I write in the following line of code.

viscircles(centers, radii, 'Color', 'g')

The error is as follows:

Error using viscircles>parseInputs (line 175)
Unknown input string: Color.

How would one get around this issue?

Thank you for your help.

P.S. I'm currently using Matlab R2015a.

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Answer 1

Walter Roberson 2017-6-29

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In R2015a it was EdgeColor rather than Color; http://www.mathworks.com/help/releases/R2015a/images/ref/viscircles.html?searchHighlight=viscircles#namevaluepairarguments

Note for readers: viscircles only permits one color to be set for all of the circles it draws in one call. At the underlying level, it use a line object for all of the circles themselves, and a second thicker line object for the edges of the circles, counting on the thinner object to only overlay part of the thicker object to create edging on both sides. The point here being that line objects are restricted to a single color each, so it is not possible to use different colors for different circles created in a single viscircles() call.

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Becky CNS 2018-2-28

Then how DO you change the colour following the viscircles function?

Walter Roberson 2018-3-1

在 MATLAB Online 中打开

h = viscircles([0 0;1 1; 2 2],[5 8 10]);
h.Children(1).Color = 'w';      %change the color of the thinner inside line
h.Children(2).Color = 'k';      %change the color of the edging

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