Computational geometry

Functions
mirkl_bool_t	mirml_geom_pnpoly (unsigned int nvert, double *vertx, double *verty, double testx, double testy)
	Point inclusion in polygon test.
mirkl_bool_t	mirml_geom_pnpoly_int64v (unsigned int ncoord, mirkl_int64_t *vcoord, mirkl_int64_t testx, mirkl_int64_t testy)
int	mirml_geom_rect_circle_itest (double rx, double ry, double rw, double rh, double ccx, double ccy, double cr, double *drmin, double *drmax)

Detailed Description

Function Documentation

mirml_geom_pnpoly()

mirkl_bool_t mirml_geom_pnpoly	(	unsigned int	nvert,
		double *	vertx,
		double *	verty,
		double	testx,
		double	testy
	)

Point inclusion in polygon test.

Note

See details of the method here: https://wrf.ecse.rpi.edu/Research/Short_Notes/pnpoly.html

Parameters

[in]	nvert	Number of vertices in the polygon.
[in]	vertx,verty	Arrays containing the x- and y-coordinates of the polygon's vertices.
[in]	testx,testy	x- and y-coordinate of the test point.

Returns

1 if point is in polygon, otherwise 0.

mirml_geom_pnpoly_int64v()

mirkl_bool_t mirml_geom_pnpoly_int64v	(	unsigned int	ncoord,
		mirkl_int64_t *	vcoord,
		mirkl_int64_t	testx,
		mirkl_int64_t	testy
	)

Version of mirml_geom_pnpoly for signed 64-bit integer numbers.

Note

Coordinates of vertices are in single array vcoord in order x0,y0,x1,y1, etc.

Parameters

ncoord

Total number of coordinates in vcoord. Must be even.

mirml_geom_rect_circle_itest()

int mirml_geom_rect_circle_itest	(	double	rx,
		double	ry,
		double	rw,
		double	rh,
		double	ccx,
		double	ccy,
		double	cr,
		double *	drmin,
		double *	drmax
	)

Rectangle-circle intersection test. Rectangle is defined by coordinates of its top-left vertex (assuming that +x is to the right and +y is downwards) and its width and height.

Parameters

drmin,drmax

If not NULL the minimal and maximal distances from circle center to the rectangle are set.

Returns

1 if rectangle is completely inside the circle, -1 if the rectangle is completely outside the circle, 0 if they intersect.

Note

The function returns 0 and rmin=0.0 if the circle is inside the rectangle.