R: Counter Clockwise Whorl

ccw {GEOmap} | R Documentation

## Counter Clockwise Whorl

### Description

Used for determining if points are in polygons.

### Usage

    ccw(p0, p1, p2)

### Arguments

`p0` | point 0
`p1` | point 1
`p2` | point 2

### Value

returns 1 or 0 depending on position of points

### Author(s)

Jonathan M. Lees <jonathan.lees@unc.edu>

### See Also

Lintersect

### Examples

    l1 = list(p1=list(x=0, y=0), p2=list(x=1,y=1))
    l2 = list(p1=list(x=6, y=4), p2=list(x=-1,y=-12))

    ccw(l1$p1, l1$p2, l2$p1)

[Package GEOmap version 2.4-0 Index]