a problem when I change patch's edgealpha property in scrollpanel

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Fred Sigworth 2011-6-7

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https://ww2.mathworks.cn/matlabcentral/answers/8966-a-problem-when-i-change-patch-s-edgealpha-property-in-scrollpanel

关闭： MATLAB Answer Bot 2021-8-20

I wrote a GUI program in which, you load an image file first, and then, you can add circles on it by clicking button named " add circles", and then you can change the circles's transparency by dragging a scrollbar. Because the image file is very big comparing to the GUI window, so I used a scrollpanel to show it. And all the positions and radius of circles can be read from a .mat file. I drew all the circles using patch function. But when I set the patches's edgealpha property, all the image behind the scrollpanel will show out. Only when the edgealpha equals zero, it will show the image part inside the scrollpanel. I donot know how to solve it. Can anybody help me? Thanks a lot.

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Walter Roberson 2011-6-7

Oh, good thought -- but wouldn't the switch of renderers happen when the alpha became non-*one* ?

Fred, is the scroll-panel implemented as a uipanel? If so which MATLAB version are you using, and which OS? There are known problems in some versions with clipping of uipanels. _Some_ of those problems occur only for uicontrols within the panel. I find reports about clipping problems for patches, especially for OpenGL; one of those reports was towards the end of 2010 (i.e., existed at least as late as 2010b.)

I suggest searching the bug database.

Fred Sigworth 2011-6-10