Can I have round corners with PATCH?

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Kevin
Kevin on 22 Mar 2022
Commented: Les Beckham on 22 Mar 2022
I use the following to create a rectangular box using PATCH,
patch([7 7 5 5], [5 7 7 5], 'r')
axis([0 10 0 10])
I want round corners. I have tried the property LineJoin but it does not do anything.
h.LineJoin = 'round';
So is this possible?

Accepted Answer

Matt J
Matt J on 22 Mar 2022
Edited: Matt J on 22 Mar 2022
You can with polyshape,
h=polybuffer( polyshape([7 7 5 5], [5 7 7 5]),0.5);
plot(h,'FaceColor','r', 'FaceAlpha',0.5)
  1 Comment
Kevin
Kevin on 22 Mar 2022
Great. Thank you.
Also I can control transparency.
plot(h, 'FaceAlpha', 0.1)

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More Answers (1)

Les Beckham
Les Beckham on 22 Mar 2022
Edited: Les Beckham on 22 Mar 2022
Try this. Adjust the 'curvature' value to adjust the ratio of the round corners to the size of the rectangle (1.0 will result in a circle).
rectangle('position', [5 5 2 2], 'curvature', 0.2, 'facecolor', 'r')
axis equal
axis([0 10 0 10])
  4 Comments
Kevin
Kevin on 22 Mar 2022
I see. But the forth element is not mentioned in the DOC.
I am hoping that this is not an undocumented feature and it may get removed in the future.
But thanks for mentioning this. I have learnt something new today. Great.
Les Beckham
Les Beckham on 22 Mar 2022
You are welcome.
I did too! I wasn't aware of polyshape or polybuffer. Apparently those were added during the several years that I didn't have a copy of Matlab.

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