Name
rotate — rotation of a set of points
Calling Sequence
xy1=rotate(xy,[theta,orig])
Parameters
- xy
matrice of size (2,.).
- xy1
matrice of size (2,.).
- theta
real, angle en radian; default value is 0.
- orig
center of the rotation; default value is [0;0].
Description
rotate performs a rotation with angle theta:
xy1(:,i) = M(theta) *xy (:,i) + orig
where M stands for the corresponding rotation matrix.
Examples
xsetech([0,0,1,1],[-1,-1,1,1])
xy=[(0:0.1:10);sin(0:0.1:10)]/10;
for i=2*%pi*(0:10)/10,
[xy1]=rotate(xy,i);
xpoly(xy1(1,:),xy1(2,:),"lines")
end