Why is the patch function modifying the line width of existing lines?

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Ana
Ana 2015-6-9
评论： Tong Zhao 2022-7-29
Hello all, I am having some trouble with the patch function, whenever I use it it is changing the line width (at least apparently) of already existing lines. Here is a code example:
t=0:0.01:4
figure
plot(t,t.^2)
hold on
plot([1,1],[0,16],'--r','LineWidth',2)
plot([2,2],[0,16],'--r','LineWidth',2)
plot([3,3],[0,16],'--r','LineWidth',2)
patch([1,1,2,2],[0,16,16,0],'b','FaceAlpha',0.1,'LineStyle','none')
Before the patch command, the lines have a specific width, but after it they change! Has someone faced this problem before? Is there any solucion to it?
Thank you very much in advance,
Ana

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Walter Roberson
Walter Roberson 2015-6-9
When you add the patch() the renderer changes to OpenGL, as only OpenGL can handle transparency (FaceAlpha).
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