profoundInPoly: Polygon Coordinate Checker

In asgr/ProFound: Photometry Tools

Polygon Coordinate Checker

Description

Given a convex or concave polygon, this function will check which points are inside.

Usage

profoundInPoly(x, y, poly_x, poly_y)

Arguments

x	Numeric vector; x locations to be checked. If two columns then first is taken to be x and second is taken to be y.
y	Numeric vector; y locations to be checked.
poly_x	Numeric vector; x vertices of the closing polygon to be checked. This can be convex or concave, and can be arranged clockwise or counter-clockwise. If two columns then first is taken to be poly_x and second is taken to be poly_y.
poly_y	Numeric vector; y vertices of the closing polygon to be checked. This can be convex or concave, and can be arranged clockwise or counter-clockwise.

Details

Nothing else currently.

Value

Logical vector of length x. This will be a flag specifying if the point is inside or outside the polygon provided.

Author(s)

Aaron Robotham (and C code W. Randolph Franklin)

References

Uses code provided on https://wrfranklin.org/Research/Short_Notes/pnpoly.html by W. Randolph Franklin.

See Also

profoundSegimFix

Examples

poly_x = c(2.616268, 1.570455, 4.761987, 8.945238, 9.87955, 8.422332, 5.879925, 7.683051,
  8.800988, 6.0963, 3.35555, 3.301456, 2.616268)
poly_y = c(5.01577, 7.188526, 8.292427, 8.152249, 4.577714, 5.874359, 6.505159, 3.789214,
  2.001947, 1.406191, 2.247258, 4.38497, 5.01577)

temp_grid = expand.grid(seq(0,10,by=0.1), seq(0,10,by=0.1))

temp_sel = profoundInPoly(x=temp_grid, poly_x=poly_x, poly_y=poly_y)

magplot(poly_x, poly_y, type='l')
points(temp_grid[temp_sel,])

asgr/ProFound documentation built on Feb. 10, 2024, 9:04 p.m.