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 |

`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>

### See Also

`polygon`

, `DrawRegPolygon`

, `DrawEllipse`

, `DrawArc`

### Examples

```
# let's have a triangle
Canvas(main="Rotation")
x <- DrawRegPolygon(nv=3)[[1]]
xt <- GeomTrans(x, trans=c(1, 3), scale=c(2, 2), theta=pi/4)
polygon(xt)
```

*DescTools*version 0.99.55 Index]