GeomTrans {DescTools} R Documentation

## Geometric Transformations

### Description

This function transforms geometric structures by translating, scaling and/or rotating them.

### Usage

GeomTrans(x, y = NULL, trans = 0, scale = 1, theta = 0)


### Arguments

 x, y vectors containing the coordinates of the vertices of the polygon , which has to be transformed. The coordinates can be passed in a plotting structure (a list with x and y components), a two-column matrix, .... See xy.coords. trans a vector of two values for the translation in x-, resp. y-direction. If only one value is supplied it will be recycled. scale a vector of two values for the scaling factor in x-, resp. y-direction. If only one value is supplied it will be recycled. theta angle of the rotation in radians starting from 3 o'clock counterclockwise.

### Value

The function invisibly returns a list of the coordinates for the transformed shape(s).

### Author(s)

Andri Signorell <andri@signorell.net>

polygon, DrawRegPolygon, DrawEllipse, DrawArc

### Examples

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

xt <- GeomTrans(x, trans=c(1, 3), scale=c(2, 2), theta=pi/4)
polygon(xt)


[Package DescTools version 0.99.51 Index]