# DrawArc: Draw Elliptic or Circular Arc(s)

### Description

Draw one or more elliptic or circular arcs from `angle.beg` to `angle.end` on an existing plot using classic graphics.

### Usage

 ```1 2 3 4``` ```DrawArc(x = 0, y = x, rx = 1, ry = rx, theta.1 = 0, theta.2 = 2*pi, nv = 100, col = par("col"), lty = par("lty"), lwd = par("lwd"), plot = TRUE) ```

### Arguments

 `x, y` a vector (or scalar) of xy-coordinates of the center(s) of the arc(s). `rx` a scalar or a vector giving the semi-major axis of the ellipse for the arc(s) `ry` a scalar or a vector giving the semi-minor axis of the ellipse for the arc(s). Default is radius.x which will result in a circle arc with radius.x. `theta.1` a scalar or a vector of starting angles in radians. `theta.2` a scalar or a vector of ending angles in radians. `nv` number of vertices used to plot the arc. Scalar or vector. `col` color for the arc(s). Scalar or vector. `lty` line type used for drawing. `lwd` line width used for drawing. `plot` logical. If `TRUE` the structure will be plotted. If `FALSE` only the xy-points are calculated and returned. Use this if you want to combine several geometric structures to a single polygon.

### Details

All parameters are recycled if necessary.
Be sure to use an aspect ratio of 1 as shown in the example to avoid distortion.

### Value

`DrawArc` invisibly returns a list of the calculated coordinates for all shapes.

### Author(s)

Andri Signorell <andri@signorell.net>

`DrawCircle`, `polygon`

### Examples

 ```1 2``` ```curve(sin(x), 0, pi, col="blue", asp=1) DrawArc(x = pi/2, y = 0, rx = 1, theta.1 = pi/4, theta.2 = 3*pi/4, col="red") ```

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