polygon::PolygonIntersection Class Reference

Data Structures

• struct box
• struct ipoint
• struct rng
• struct vertex

Public Member Functions

• PolygonIntersection (void)
• virtual ~PolygonIntersection ()
• float inter (std::vector< point > &a, std::vector< point > &b)
• float inter (point *a, int na, point *b, int nb)
• std::vector< point > get_ellipse (const float x, const float y, const float a, const float b, const float pa, const int n) const
• std::vector< point > get_rect (const float x, const float y, const float xw, const float yw) const

Protected Types

• typedef long long hp

Protected Member Functions

• void bd (float *X, float y)
• void bu (float *X, float y)
• void range (point *x, int c)
• void fit (point *x, int cx, vertex *ix, int fudge, float sclx, float scly, float mid)
• hp area (const ipoint &a, const ipoint &p, const ipoint &q)
• void cntrib (const ipoint &f, const ipoint &t, short w, hp *s)
• int ovl (rng p, rng q)
• void cross (vertex *a, vertex *b, vertex *c, vertex *d, double a1, double a2, double a3, double a4, hp *s)
• void inness (vertex *P, int cP, vertex *Q, int cQ, hp *s)

Protected Attributes

• box B_

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Detailed Description

Compute the area of intersection of two polygons. The polygons are given as a vector of vertices of struct point.

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Member Typedef Documentation

typedef long long polygon::PolygonIntersection::hp [protected]

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Constructor & Destructor Documentation

polygon::PolygonIntersection::PolygonIntersection

(

void

)

[inline]

virtual polygon::PolygonIntersection::~PolygonIntersection

(

)

[inline, virtual]

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Member Function Documentation

float polygon::PolygonIntersection::inter	(	std::vector< point > &	a,
		std::vector< point > &	b
	)			[inline]

return the area of intersection between two plygons defined by the verices in a[] and b[].

Referenced by Extractor::extract_aperture_w_rebin(), and Projector::find_res_elems_ell_aperture().

float polygon::PolygonIntersection::inter	(	point *	a,
		int	na,
		point *	b,
		int	nb
	)

return the area of intersection between two plygons defined by the verices in a[] and b[].

References area(), B_, cross(), fit(), inness(), polygon::PolygonIntersection::box::max, polygon::PolygonIntersection::box::min, ovl(), range(), polygon::point::x, and polygon::point::y.

std::vector< point > polygon::PolygonIntersection::get_ellipse	(	const float	x,
		const float	y,
		const float	a,
		const float	b,
		const float	pa,
		const int	n
	)			const

return a vector<point> with n vertices on an ellipse of semi-axes a and b and position angle pa centered at x, y.

References c, and v.

Referenced by Projector::find_res_elems_ell_aperture().

std::vector< point > polygon::PolygonIntersection::get_rect	(	const float	x,
		const float	y,
		const float	xw,
		const float	yw
	)			const

return a vector<point> with 4 vertices on a rectangle which is xw pixel wide and yw pixel high x, y.

References v.

void polygon::PolygonIntersection::bd	(	float *	X,
		float	y
	)			[inline, protected]

Referenced by range().

void polygon::PolygonIntersection::bu	(	float *	X,
		float	y
	)			[inline, protected]

Referenced by range().

void polygon::PolygonIntersection::range	(	point *	x,
		int	c
	)			[protected]

References B_, bd(), bu(), polygon::PolygonIntersection::box::max, polygon::PolygonIntersection::box::min, polygon::point::x, and polygon::point::y.

Referenced by inter().

void polygon::PolygonIntersection::fit	(	point *	x,
		int	cx,
		vertex *	ix,
		int	fudge,
		float	sclx,
		float	scly,
		float	mid
	)			[protected]

References B_, c, polygon::PolygonIntersection::vertex::in, polygon::PolygonIntersection::vertex::ip, polygon::PolygonIntersection::box::min, polygon::PolygonIntersection::vertex::rx, polygon::PolygonIntersection::vertex::ry, polygon::point::x, polygon::PolygonIntersection::ipoint::x, polygon::point::y, and polygon::PolygonIntersection::ipoint::y.

Referenced by inter().

hp polygon::PolygonIntersection::area	(	const ipoint &	a,
		const ipoint &	p,
		const ipoint &	q
	)			[inline, protected]

References polygon::PolygonIntersection::ipoint::x, and polygon::PolygonIntersection::ipoint::y.

Referenced by inness(), and inter().

void polygon::PolygonIntersection::cntrib	(	const ipoint &	f,
		const ipoint &	t,
		short	w,
		hp *	s
	)			[inline, protected]

References polygon::PolygonIntersection::ipoint::x, and polygon::PolygonIntersection::ipoint::y.

Referenced by cross(), and inness().

int polygon::PolygonIntersection::ovl	(	rng	p,
		rng	q
	)			[inline, protected]

References polygon::PolygonIntersection::rng::mn, and polygon::PolygonIntersection::rng::mx.

Referenced by inter().

void polygon::PolygonIntersection::cross	(	vertex *	a,
		vertex *	b,
		vertex *	c,
		vertex *	d,
		double	a1,
		double	a2,
		double	a3,
		double	a4,
		hp *	s
	)			[protected]

References cntrib(), polygon::PolygonIntersection::vertex::in, polygon::PolygonIntersection::vertex::ip, polygon::PolygonIntersection::ipoint::x, and polygon::PolygonIntersection::ipoint::y.

Referenced by inter().

void polygon::PolygonIntersection::inness	(	vertex *	P,
		int	cP,
		vertex *	Q,
		int	cQ,
		hp *	s
	)			[protected]

References area(), c, cntrib(), polygon::PolygonIntersection::vertex::in, polygon::PolygonIntersection::vertex::ip, polygon::PolygonIntersection::rng::mx, polygon::PolygonIntersection::vertex::rx, and polygon::PolygonIntersection::ipoint::x.

Referenced by inter().

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Field Documentation

box polygon::PolygonIntersection::B_ [protected]

Referenced by fit(), inter(), and range().