dpoint2.h File Reference

#include "GeomExport.h"
#include "maxheap.h"
#include "point2.h"
#include "assert1.h"
#include <iosfwd>

Classes
class	DPoint2
	Description: This class describes a 2D point using double precision x and y coordinates. More...
class	DRay2
	This class describes a vector in space using an origin point p, and a unit direction vector in double precision. More...

Functions
double	Length (const DPoint2 &p)
	Returns the 'Length' of the point. More...
int	MaxComponent (const DPoint2 &p)
	Returns the component with the maximum absolute value. More...
int	MinComponent (const DPoint2 &p)
	Returns the component with the minimum absolute value. More...
DPoint2	Normalize (const DPoint2 &p)
	Returns a unit vector. More...
DPoint2	operator* (double m, const DPoint2 &p)
	Multiply a DPoint2 by a scalar. More...
DPoint2	operator* (const DPoint2 &p, double m)
	Multiply a DPoint2 by a scalar. More...
DPoint2	operator/ (const DPoint2 &p, double d)
	Divide a DPoint2 by a scalar. More...
std::ostream &	operator<< (std::ostream &s, const DPoint2 &p)
	Output a DPoint2 to a std::ostream as text. More...
Point2	Point2FromDPoint2 (const DPoint2 &from)
double	DotProd (const DPoint2 &a, const DPoint2 &b)
	Returns the dot product of two DPoint2s. More...
int	DoublePrecisionLineSegmentIntersection (const DPoint2 &seg1Start, const DPoint2 &seg1End, const DPoint2 &seg2Start, const DPoint2 &seg2End, DPoint2 &intersectPoint)
	Double-Precision Line Segment Intersection test. More...
int	DoublePrecisionLineIntersection (const DPoint2 &line1PointA, const DPoint2 &line1PointB, const DPoint2 &line2PointA, const DPoint2 &line2PointB, DPoint2 &intersectPoint)
	Double-Precision Line Intersection test. More...

Function Documentation

double Length ( const DPoint2 &  p )

inline

Returns the 'Length' of the point.

This is sqrt(v.x*v.x+v.y*v.y)

Parameters

p	the DPoint2 to test

Returns

the length value

                                       {
    return (double)sqrt(v.x*v.x + v.y*v.y);
}

int MaxComponent

(

const DPoint2 &

p

)

Returns the component with the maximum absolute value.

Parameters

p	the DPoint2 to test

Returns

the maximum component (0=x, 1=y).

int MinComponent

(

const DPoint2 &

p

)

Returns the component with the minimum absolute value.

0=x, 1=y.

Parameters

p	the DPoint2 to test

Returns

the minimum component (0=x, 1=y).

DPoint2 Normalize

(

const DPoint2 &

p

)

Returns a unit vector.

This is a DPoint2 with each component divided by the point Length().

Parameters

p	the DPoint2 to test

Returns

the unit vector for the specified DPoint2

DPoint2 operator* ( double  m, const DPoint2 &  p  )

inline

Multiply a DPoint2 by a scalar.

Parameters

m	the multiplier
p	the DPoint2

Returns

the resulting DPoint2

                                                     {
    return(DPoint2(a.x*f, a.y*f));
}

DPoint2 operator* ( const DPoint2 &  p, double  m  )

inline

Multiply a DPoint2 by a scalar.

Parameters

p	the DPoint2
m	the multiplier

Returns

the resulting DPoint2

                                                     {
    return(DPoint2(a.x*f, a.y*f));
}

DPoint2 operator/ ( const DPoint2 &  p, double  d  )

inline

Divide a DPoint2 by a scalar.

Parameters

p	the DPoint2
d	the divisor

Returns

the resulting DPoint2

                                                     {
    DbgAssert(f != 0.0);
    double invF = 1.0 / f;  // Mimic 2019 behavior
    return(DPoint2(a.x * invF, a.y * invF));
}

std::ostream& operator<<	(	std::ostream &	s,
		const DPoint2 &	p
	)

Output a DPoint2 to a std::ostream as text.

Parameters

s	the std::ostream
p	the DPoint2

Returns

the DPoint2 text value

Point2 Point2FromDPoint2 ( const DPoint2 &  from )

inline

{
    return Point2(from.x, from.y);
}

double DotProd	(	const DPoint2 &	a,
		const DPoint2 &	b
	)

Returns the dot product of two DPoint2s.

int DoublePrecisionLineSegmentIntersection	(	const DPoint2 &	seg1Start,
		const DPoint2 &	seg1End,
		const DPoint2 &	seg2Start,
		const DPoint2 &	seg2End,
		DPoint2 &	intersectPoint
	)

Double-Precision Line Segment Intersection test.

Determines if two line segments intersect.

Parameters

seg1Start	endpoint 1 for the first line segment
seg1End	endpoint 2 for the first line segment
seg2Start	endpoint 1 for the second line segment
seg2End	endpoint 2 for the second line segment
intersectPoint	if the lines intersect, this will return the intersection point.

Returns

Intersection determination (0: No intersection, 1: Lines intersect (intersection location in 'intersectPoint'), 2: Lines parallel (no intersection))

int DoublePrecisionLineIntersection	(	const DPoint2 &	line1PointA,
		const DPoint2 &	line1PointB,
		const DPoint2 &	line2PointA,
		const DPoint2 &	line2PointB,
		DPoint2 &	intersectPoint
	)

Double-Precision Line Intersection test.

Determines if two infinite lines cross, and if so, where.

Parameters

line1PointA	point 1 on the first line
line1PointB	point 2 on the first line
line2PointA	point 1 on the second line
line2PointB	point 2 on the second line
intersectPoint	if the lines intersect, this will return the intersection point.

Returns

Intersection determination (0: Lines parallel, 1: Lines intersect (intersection location in 'intersectPoint'))