Overlaying a semi-transparent rectangle on a plot created with imagesc?
I used imagesc
MatLab to plot the acoustic field. Now I want to overlay a semi-transparent filled rectangle at a specific location in the image. Ideally, I would like to do something like the following:
imagesc(g,g,field);
hold on
plotRectangle([100,100,200,200], 'b', 0.5)
hold off
where b is the color of the rectangle and 0.5 is the transparency. It can be done?
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1 answer
You can use rectangle
to create a rectangle object and then use the color specified as RGBA to enable transparency
rectangle('Position', [100 100 200 200], 'FaceColor', [0 0 1 0.5])
Alternatively, you can just use patch
object
p = patch('vertices', [100, 100; 100, 200; 200, 200; 200 100], ...
'faces', [1, 2, 3, 4], ...
'FaceColor', 'b', ...
'FaceAlpha', 0.5)
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