Help with patch
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Hello, i need your help to understand how patch works. I have made a 2D plot in matlab and i would like to add some patches to it. I use the following commands
xpatch=[340.04 340.07;340.04 340.07]; % create x axis patch area
ypatch=[0 1600;0 1600]; % create y axis patch area
patch(xpatch,ypatch,'r');
my problem is that even if the patch object has been created in the plot brower of the figure window, it isn't visible in my figure. I would appreciate any help
Thank you
采纳的回答
Walter Roberson
2012-2-29
Do not use 2D arrays for the patch coordinates: patch() wants vector lists of coordinates for each patch.
xpatch = [340.04 340.07 340.07 340.04 340.04];
ypatch = [0 0 1600 1600 0];
patch(xpatch,ypatch,'r')
The point order is important here, as are the seeming duplications.
4 个评论
Andrew Newell
2012-2-29
The fifth elements in xpatch and ypatch aren't needed.
Andrew Newell
2012-2-29
The reason for the point order is that you must give the points in the order you are traversing the patch, e.g, [xpatch(1) ypatch(1)] to [xpatch(2) ypatch(2)] ...
Walter Roberson
2012-2-29
I prefer not to count upon patch() automatically closing the patch.
Kostas
2012-2-29
更多回答（1 个）
Kostas
2012-2-29
0 个投票
1 个评论
Jonathan Sullivan
2012-2-29
It works for me. Make sure you use the hold on command before trying to pot anything else on top.
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