How can I fill the inside circle with any color?

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Shreen El-Sapa
Shreen El-Sapa 2023-12-17
评论： Star Strider 2023-12-17
too long code

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回答（1 个）

Star Strider
Star Strider 2023-12-17
Ran in:
Try something like this —
imshow(imread('st1.jpg'))
a = linspace(0, 2*pi, 500).';
r = [1 2];
x = r.*cos(a);
y = r.*sin(a);
figure
hp1 = plot(x, y);
hold on
patch(hp1(1).XData, hp1(1).YData, [0.1 0.5 0.9])
hold off
axis('equal')
You will need to choose the correct (x,y) data for the inner circle. Then use the patch function to fill it.
.
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Star Strider
Star Strider 2023-12-17
My pleasure!
The entire code may be too long, however saving the data that created that plot to a .mat file, and posting the code that plotted it from those data might be enough.
A less favorable option for me would be to upload the .jpg image as a .fig file instead. I may be able to work with it in that context, since I might be able to get the data from it. Some plots are relatively straightforward to work with and others can be incredibly difficult.

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