Mercator::Edge Class Reference

The edge of an area. More...

List of all members.

Public Member Functions
	Edge (const Point2 &a, const Point2 &b)
	Constructor.
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.
double	xValueAtY (double y) const
	Determine the x coordinate at a given y coordinate.
bool	operator< (const Edge &other) const
	Compare the y coordinate of the start with another edge.
Private Attributes
Point2	m_start
	The point describing the start of the edge.
Vector2	m_seg
	The vector describing the edge from its start.
double	m_inverseGradient
	The inverse of the gradient of the line.

---

Detailed Description

The edge of an area.

---

Constructor & Destructor Documentation

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

double Mercator::Edge::xValueAtY

(

double

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()().

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.

---

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

• AreaShader.cpp