# Rotate

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##### Rotate a Geometric Structure

Rotate a geometric structure by an angle theta around a centerpoint xy.

Keywords
aplot
##### Usage
Rotate(x, y = NULL, mx = NULL, my = NULL, theta = pi/3, asp = 1)
##### Arguments
x, y
vectors containing the coordinates of the vertices of the polygon , which has to be rotated. The coordinates can be passed in a plotting structure (a list with x and y components), a two-column matrix, .... See xy.coords.

mx, my
xy-coordinates of the center of the rotation. If left to NULL, the centroid of the structure will be used.

theta
angle of the rotation

asp
the aspect ratio for the rotation. Helpful for rotate structures along an ellipse.

##### See Also

polygon, DrawRegPolygon, DrawEllipse, DrawArc

• Rotate
##### Examples
# let's have a triangle
Canvas(main="Rotation")
x <- DrawRegPolygon(nv=3)[[1]]

# and rotate
sapply( (0:3) * pi/6, function(theta) {
xy <- Rotate( x=x, theta=theta )
polygon(xy, col=SetAlpha("blue", 0.2))
} )

abline(v=0, h=0)

Documentation reproduced from package DescTools, version 0.99.19, License: GPL (>= 2)

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