How to create a transparent, rectangular patch with rounded corners?
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Chris L'Esperance
on 16 Jan 2019
Commented: Walter Roberson
on 5 Jun 2023
It would be helpful to create a transparent, rectangular patch with rounded corners. This could be acheived with something like this:
h = rectangle('Position', [x1, y1, x2, y2], ...
'Curvature', 0.2, ...
'FaceColor', 'r', ...
'EdgeColor', 'r');
Unfortunately, rectangle properties do not include FaceAlpha and EdgeAlpha. Patch objects do, so I thought that I could get the XData and YData properties of the rectangle object from which to create a patch object. No dice; wasn't able to find these properties.
Again, the desired features are: transparency + rounded corners + face color
1 Comment
H W
on 5 Jun 2023
IN YOU FIGURE, you select the input rectange, open Attribute checker, set the facealpha. ok!
Accepted Answer
More Answers (4)
Jon
on 18 Sep 2019
You can use the rectangle function if you give the color as a triple instead of a string and add a fourth argument which specifices the alpha. Here, the alpha is 0.7.
h = rectangle('Position', [x1, y1, x2, y2], ...
'Curvature', 0.2, ...
'FaceColor', [1, 0, 0, 0.7], ...
'EdgeColor', [1, 0, 0, 0.7]);
2 Comments
Jan
on 16 Jan 2019
Edited: Jan
on 16 Jan 2019
A rectangle object does not have XData and YData properties and it does not allow to set the transparency by Alpha blending. This means clearly, that you cannot use rectangle to solve your problem, although it looks almost like you want it.
All you need is to define the XData and YData according to your inputs. The equations for the rounded corners can be obtained by some simple equations. I'm not sure, how the "Curvature" of rectangle objects is defined. It should be easy to find the required circles, but it is a tedius work.
H W
on 5 Jun 2023
IN YOU FIGURE, you select the input rectange, open Attribute checker, set the facealpha. ok!
1 Comment
Walter Roberson
on 5 Jun 2023
rectangle() objects do not have a FaceAlpha property; https://www.mathworks.com/help/matlab/ref/matlab.graphics.primitive.rectangle-properties.html
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