GLViewer_Poly Class Reference

#include <GLViewer_Geom.h>

Public Member Functions
	GLViewer_Poly (const GLViewer_PntList *thePoints)
virtual	~GLViewer_Poly ()
void	AddPoint (GLViewer_Pnt &pnt)
	Adds point to polygon.
int	Count () const
	Returns number of point.
virtual bool	IsIn (const GLViewer_Pnt &thePnt) const
	Returns true if a point lies inside this polygon.
virtual bool	IsCovers (const GLViewer_Poly &thePoly) const
	Returns true if a other polygon covers this polygon.
virtual bool	IsCovers (const GLViewer_Rect &theRect) const
	Likes the above function.
virtual bool	HasIntersection (const GLViewer_Segment &theSegment) const
Private Attributes
GLViewer_PntList *	myPoints

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Detailed Description

Class GLViewer_Poly Polygon for 2d detection

---

Constructor & Destructor Documentation

GLViewer_Poly::GLViewer_Poly

(

const GLViewer_PntList *

thePoints

)

constructs a closed polygon from the given ordered list of points

GLViewer_Poly::~GLViewer_Poly

(

)

[virtual]

destructor, <myPoints> mustn't be deleted here!

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Member Function Documentation

void GLViewer_Poly.AddPoint

(

GLViewer_Pnt &

pnt

)

int GLViewer_Poly.Count

(

)

const

bool GLViewer_Poly::IsIn

(

const GLViewer_Pnt &

thePnt

)

const [virtual]

Returns:

true if <thePnt> lies within this polygon

References myPoints, and GLViewer_Pnt.y().

bool GLViewer_Poly::IsCovers

(

const GLViewer_Poly &

thePoly

)

const [virtual]

Returns:

true if <thePnt> lies within this polygon

true if <thePoly> covers this polygon

References Count(), IsIn(), and myPoints.

bool GLViewer_Poly::IsCovers

(

const GLViewer_Rect &

theRect

)

const [virtual]

Returns:

true if <theRect> covers this polygon

References GLViewer_Rect.bottom(), GLViewer_Poly(), IsCovers(), GLViewer_Rect.left(), myPoints, GLViewer_Rect.right(), and GLViewer_Rect.top().

bool GLViewer_Poly::HasIntersection

(

const GLViewer_Segment &

theSegment

)

const [virtual]

Returns:

true if polygon has intersection with segment or ray

Parameters:

theSegment

- segment to check intersection

References GLViewer_Segment.HasIntersection(), and myPoints.

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Field Documentation

GLViewer_PntList* GLViewer_Poly.myPoints [private]