# draw.arc: Draw arc In plotrix/plotrix: Various Plotting Functions

## Description

Draw one or more arcs using classic graphics.

## Usage

 ```1 2``` ``` draw.arc(x=1,y=NULL,radius=1,angle1=deg1*pi/180,angle2=deg2*pi/180, deg1=0,deg2=45,n=0.05,col=NA,lwd=NA,...) ```

## Arguments

 `x` x coordinate of center. Scalar or vector. `y` y coordinate of center. Scalar or vector. `radius` radius. Scalar or vector. `angle1` Starting angle in radians. Scalar or vector. `angle2` Ending angle in radians. Scalar or vector. `deg1` Starting angle in degrees. Scalar or vector. `deg2` Ending angle in degrees. Scalar or vector. `n` Number of polygons to use to approximate the arc. `col` Arc colors. `lwd` Line width for the arc. `...` Other arguments passed to segments. Vectorization is not supported for these.

## Details

Draws one or more arcs from `angle1` to `angle2`. If `angle1` is numerically greater than `angle2`, then the angles are swapped.

Be sure to use an aspect ratio of 1 as shown in the example to avoid distortion. For argument 'n' (which may be either a scalar or a vector, although most likely you will leave it at the default value), an integer value means to use that number of segments to approximate the arc, while a non-integer value means to use enough segments so that the angle that successive segments make with one another is no more than n radians.

## Value

Returns a matrix of expanded arguments invisibly.

## Author(s)

Gabor Grothendieck. Improvements by Ted Toal.

## Examples

 ```1 2 3 4 5 6 7 8 9``` ``` plot(1:10, asp = 1,main="Test draw.arc") draw.arc(5, 5, 1:10/10, deg2 = 1:10*10, col = "blue") draw.arc(8, 8, 1:10/10, deg2 = 1:10*10, col = 1:10) draw.arc(5, 5, 3, deg1=100, deg2=170, col="gold", lwd=50, lend=1) # example taken from post by Hans Borcher: # https://stat.ethz.ch/pipermail/r-help/2009-July/205728.html # Note setting of aspect ratio to 1 first. curve(sin(x), 0, pi, col="blue", asp=1) draw.arc(pi/2, 0, 1, deg1=45, deg2=135, col="red") ```

plotrix/plotrix documentation built on Jan. 23, 2020, 1:38 p.m.