cxy Class Reference

2D point or vector More...

#include <cxy.h>

Public Member Functions
	cxy (double X, double Y)
	cxy (const cxy &xy)
cxy	vect (const cxy &other) const
	vector from this point to other More...
double	dist2 (const cxy &other) const
	distance squared from this point to other More...
double	tclosest (const cxy &end1, const cxy &end2) const
cxy	closest (const cxy &end1, const cxy &end2) const
double	dis2toline (const cxy &end1, const cxy &end2) const
	distance squared from this point to nearest point on line segment More...
bool	isInside (const std::vector< cxy > &polygon) const
	true if point inside polygon
bool	isValid () const
void	invalidate ()
void	zoom (float ratio)
bool	operator== (const cxy &other) const
cxy	operator+ (const cxy &other) const
cxy	operator- (const cxy &other) const
cxy &	operator*= (float s)
cxy &	operator*= (const cxy &other)
cxy &	operator+= (const cxy &other)
cxy &	operator/= (float s)

Static Public Member Functions
static cxy	enclosingWidthHeight (const std::vector< cxy > &polygon)
static bool	isIntersection (cxy &p, const cxy &a, const cxy &b, const cxy &c, const cxy &d)
	true if line segments intersect More...
static bool	isIntersect (cxy &p1, cxy &q1, cxy &p2, cxy &q2)
static double	angle (const cxy &a, const cxy &b, const cxy &c, const cxy &d)
	angle between line segments, radians More...
static double	clockwise (const cxy &a, const cxy &b, const cxy &c)
	clockwise turn going from a to b to c, radians More...

Public Attributes
double	x
double	y

Friends
std::ostream &	operator<< (std::ostream &os, cxy p)

Detailed Description

2D point or vector

Member Function Documentation

angle()

static double cxy::angle ( const cxy &  a, const cxy &  b, const cxy &  c, const cxy &  d  )

inlinestatic

angle between line segments, radians

Parameters

a,b	line segment
c,d	line segment

Returns

angle in radians

clockwise()

static double cxy::clockwise ( const cxy &  a, const cxy &  b, const cxy &  c  )

inlinestatic

clockwise turn going from a to b to c, radians

Parameters

a
b
c

Returns

angle in radians

dis2toline()

double cxy::dis2toline ( const cxy &  end1, const cxy &  end2  ) const

inline

distance squared from this point to nearest point on line segment

Parameters

end1	line segment endpoint
end2	line segment endpoint

Returns

dist2()

double cxy::dist2 ( const cxy &  other ) const

inline

distance squared from this point to other

Parameters

other

Returns

isIntersection()

static bool cxy::isIntersection ( cxy &  p, const cxy &  a, const cxy &  b, const cxy &  c, const cxy &  d  )

inlinestatic

true if line segments intersect

Parameters

[out]	p	point of intersection
[in]	a,b	line segment
[in]	c,d	line segment

Returns

true if line segments intersect

       intersection point

       double det = A1 * B2 - A2 * B1
    if (det == 0) {

Lines are parallel } else { double x = (B2 * C1 - B1 * C2) / det double y = (A1 * C2 - A2 * C1) / det }

vect()

cxy cxy::vect ( const cxy &  other ) const

inline

vector from this point to other

Parameters

other

Returns

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The documentation for this class was generated from the following file:

• include/cxy.h