R: Draw Elliptic Arc(s)

DrawArc {DescTools} | R Documentation

## Draw Elliptic Arc(s)

### Description

Draw one or more elliptic (or circular) arcs from `theta.1` to `theta.2` on an existing plot using classic graphics.

### Usage

    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>

### See Also

`DrawCircle`, `polygon`

### Examples

    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")

[Package DescTools version 0.99.24 Index]