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How to define the Y direction in a GUI axes

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F Z
F Z 2013-8-19
Hello,
Is it possible to rotate a segment of 30°?
In fact, i tried the rotate function :rotate(h,direction,alpha) but i can't figure out which one of my axis corresponds to The Ydirection.
The line to be rotated is : h2=line([-a,a],[wp,wp],'color','k','linewidth',1);
Any ideas please?
Thank you in advance for your help

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回答（1 个）

Image Analyst
Image Analyst 2013-8-19
The y direction/axis is the vertical axis. You can set the direction to be increasing going up or going down. To rotate coordinates, just use the usual 2 by 2 array [cos sin; -sin cos] to get your new coordinates. Then call line() with those.

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