Draw rotated rectangle with rounded edge

I found the answer to drawing rotated rectangles using the solution provided here by Y Yoon. However, I am not sure how to integrate curvature to the rectangle at the edges like it can be done in the function rectangle. Any other solution will also be highly appreciated. Thanks in advance.

[Adam Danz]

Is there something unclear in the documentation?

rectangle('Position',pos,'Curvature',cur)

[J AI]

No, nothing is unclear as to how to define the curvature, however, I want curvature as well as to rotate the rectangle at the same time. That is what I am not being able to do currently.

[Adam Danz]

I see.... I'll add an answer in a bit.

[J AI]

Thank you. Your help is highly appreciated.

Answer 1

[Adam Danz]

I created a function to extend the capabilities of Matlab's rectangle() but with these additional features:

• Position rectangles by their center points rather than by their lower left coordinate.
• Supports creation of multiple rectangles with independent properties
• Outputs handles to patch object rather than rectangle
• Outputs rectangles parameters including vertices
• Option to rotate rectangles about their centers

See the example file in rectangle2() on the file exchange.

[J AI]

Excellent job! Great to have people like you supporting the community.

[Adam Danz]

Thanks J AI

Please follow that function and check for update because I've already discovered some weakesses and will update the function soon.

[J AI]

Yes. That's true. This is the issue I currently have with the function:

I am plotting several rectangles using a for loop (because I need different FaceColor for each), and because of the "drawnow" and "pause" command, the plot takes quite a lot of time to complete.

[Adam Danz]

@J AI the function has been updated to vs 1.1.0 and is a bit faster than the first version.

It now includes an example file and show how to apply different color to the rectangles. Note that you can also specify FaceColor to set the color of all rectangles.

The drawnow is required to update the properties that I'm pulling the curvature data from and as you said, it slows things down a bit. It's unavoidable with this method although I'll think about changing methods some time in the future.

[Adam Danz]

@J AI

Please download vs 2.0.0 which I just updated.

It fixes some minor potential errors but it also adds a lot of flexibility to set multiple rectangle properties (see example file).

https://www.mathworks.com/matlabcentral/fileexchange/85418-rectangle2

I don't plan for any further updates unless errors are reported. At some point I may get around to figuring out how Matalb creates the curved edges rather than using the rectangle function to create them.