Mercator::Edge Class Reference

The edge of an area. More...

Public Member Functions
	Edge (const Point2 &a, const Point2 &b)
	Constructor. More...
Point2	start () const
	Accessor for the point describing the start of the edge.
Point2	end () const
	Determine the point describing the end of the edge.
WFMath::CoordType	xValueAtY (WFMath::CoordType y) const
	Determine the x coordinate at a given y coordinate. More...
bool	operator< (const Edge &other) const
	Compare the y coordinate of the start with another edge. More...

Private Attributes
Point2	m_start
	The point describing the start of the edge.
Vector2	m_seg
	The vector describing the edge from its start.
WFMath::CoordType	m_inverseGradient
	The inverse of the gradient of the line.

Detailed Description

The edge of an area.

Constructor & Destructor Documentation

Edge()

Mercator::Edge::Edge ( const Point2 &  a, const Point2 &  b  )

inline

Constructor.

Parameters

a	one end of the line defining the edge.
b	one end of the line defining the edge.

References m_inverseGradient, m_seg, and m_start.

Member Function Documentation

operator<()

bool Mercator::Edge::operator< ( const Edge &  other ) const

inline

Compare the y coordinate of the start with another edge.

This operator ensures that edges can be sorted, compares the y y coordinate of the start of the edges.

References m_start.

xValueAtY()

WFMath::CoordType Mercator::Edge::xValueAtY ( WFMath::CoordType  y ) const

inline

Determine the x coordinate at a given y coordinate.

Calculate the x coordinate on the edge line where the y coordinate is the value specified.

Parameters

y	the y coordinate where the calculation is required.

References m_inverseGradient, and m_start.

Referenced by Mercator::EdgeAtY::operator()().

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

• AreaShader.cpp