ParallelogramBoundary Class Reference

#include "AreaBoundary.h"

Inheritance diagram for ParallelogramBoundary:

Public Member Functions
	ParallelogramBoundary (Position const &cornerA, Position const &cornerB, Position const &cornerD, bool isInverted=false)
Public Member Functions inherited from AreaBoundary
bool	IsWithinBoundary (Position const *pos) const
bool	IsWithinBoundary (Position const &pos) const
virtual	~AreaBoundary ()

Protected Member Functions
bool	IsWithinBoundaryArea (Position const *pos) const override
Protected Member Functions inherited from AreaBoundary
	AreaBoundary (bool isInverted)
virtual bool	IsWithinBoundaryArea (Position const *pos) const =0

Private Attributes
DoublePosition const	_a
DoublePosition const	_b
DoublePosition const	_d
DoublePosition const	_c
double const	_abx
double const	_dax
double const	_aby
double const	_day

Detailed Description

Constructor & Destructor Documentation

ParallelogramBoundary()

ParallelogramBoundary::ParallelogramBoundary	(	Position const &	cornerA,
		Position const &	cornerB,
		Position const &	cornerD,
		bool	isInverted = false
	)

                                                                                                                                       :
    AreaBoundary(isInverted), _a(cornerA), _b(cornerB), _d(cornerD), _c(DoublePosition(_d.GetDoublePositionX() + (_b.GetDoublePositionX() - _a.GetDoublePositionX()), _d.GetDoublePositionY() + (_b.GetDoublePositionY() - _a.GetDoublePositionY()))), _abx(_b.GetDoublePositionX() - _a.GetDoublePositionX()), _dax(_a.GetDoublePositionX() - _d.GetDoublePositionX()), _aby(_b.GetDoublePositionY() - _a.GetDoublePositionY()), _day(_a.GetDoublePositionY() - _d.GetDoublePositionY()) { }

Member Function Documentation

IsWithinBoundaryArea()

bool ParallelogramBoundary::IsWithinBoundaryArea ( Position const *  pos ) const

overrideprotectedvirtual

Implements AreaBoundary.

{
    // half-plane signs
    bool sign1 = ((-_b.GetDoublePositionX() + pos->GetPositionX()) * _aby - (-_b.GetDoublePositionY() + pos->GetPositionY()) * _abx) < 0;
    bool sign2 = ((-_a.GetDoublePositionX() + pos->GetPositionX()) * _day - (-_a.GetDoublePositionY() + pos->GetPositionY()) * _dax) < 0;
    bool sign3 = ((-_d.GetDoublePositionY() + pos->GetPositionY()) * _abx - (-_d.GetDoublePositionX() + pos->GetPositionX()) * _aby) < 0; // AB = -CD
    bool sign4 = ((-_c.GetDoublePositionY() + pos->GetPositionY()) * _dax - (-_c.GetDoublePositionX() + pos->GetPositionX()) * _day) < 0; // DA = -BC
 
    // if all signs are equal, the point is inside
    return ((sign1 == sign2) && (sign2 == sign3) && (sign3 == sign4));
}

References _a, _abx, _aby, _b, _c, _d, _dax, _day, AreaBoundary::DoublePosition::GetDoublePositionX(), AreaBoundary::DoublePosition::GetDoublePositionY(), Position::GetPositionX(), and Position::GetPositionY().

Member Data Documentation

_a

DoublePosition const ParallelogramBoundary::_a

private

Referenced by IsWithinBoundaryArea().

_abx

double const ParallelogramBoundary::_abx

private

Referenced by IsWithinBoundaryArea().

_aby

double const ParallelogramBoundary::_aby

private

Referenced by IsWithinBoundaryArea().

_b

DoublePosition const ParallelogramBoundary::_b

private

Referenced by IsWithinBoundaryArea().

_c

DoublePosition const ParallelogramBoundary::_c

private

Referenced by IsWithinBoundaryArea().

_d

DoublePosition const ParallelogramBoundary::_d

private

Referenced by IsWithinBoundaryArea().

_dax

double const ParallelogramBoundary::_dax

private

Referenced by IsWithinBoundaryArea().

_day

double const ParallelogramBoundary::_day

private

Referenced by IsWithinBoundaryArea().