# rotate.infline: Rotate or Shift Infinite Lines In spatstat.geom: Geometrical Functionality of the 'spatstat' Family

## Description

Given the coordinates of one or more infinite straight lines in the plane, apply a rotation or shift.

## Usage

 ``` 1 2 3 4 5 6 7 8 9 10 11``` ```## S3 method for class 'infline' rotate(X, angle = pi/2, ...) ## S3 method for class 'infline' shift(X, vec = c(0,0), ...) ## S3 method for class 'infline' reflect(X) ## S3 method for class 'infline' flipxy(X) ```

## Arguments

 `X` Object of class `"infline"` representing one or more infinite straight lines in the plane. `angle` Angle of rotation, in radians. `vec` Translation (shift) vector: a numeric vector of length 2, or a `list(x,y)`, or a point pattern containing one point. `...` Ignored.

## Details

These functions are methods for the generic `shift`, `rotate`, `reflect` and `flipxy` for the class `"infline"`.

An object of class `"infline"` represents one or more infinite lines in the plane.

## Value

Another `"infline"` object representing the result of the transformation.

## Author(s)

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`infline`
 ``` 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21``` ``` L <- infline(v=0.5) plot(square(c(-1,1)), main="rotate lines", type="n") points(0, 0, pch=3) plot(L, col="green") plot(rotate(L, pi/12), col="red") plot(rotate(L, pi/6), col="red") plot(rotate(L, pi/4), col="red") L <- infline(p=c(0.4, 0.9), theta=pi* c(0.2, 0.6)) plot(square(c(-1,1)), main="shift lines", type="n") L <- infline(p=c(0.7, 0.8), theta=pi* c(0.2, 0.6)) plot(L, col="green") plot(shift(L, c(-0.5, -0.4)), col="red") plot(square(c(-1,1)), main="reflect lines", type="n") points(0, 0, pch=3) L <- infline(p=c(0.7, 0.8), theta=pi* c(0.2, 0.6)) plot(L, col="green") plot(reflect(L), col="red") ```