grinliz::LineLoop Class Reference

A representation of a closed 2D polygon as a series of points. More...

#include <glgeometry.h>

List of all members.

Public Member Functions
	LineLoop ()
	Construct an empty loop.
void	Clear ()
	Clear the loop and free the memory for the lines.
void	Delete (LineNode *del)
	Delete a point.
void	AddAtEnd (LineNode *node)
	Add a point at the end of the loop.
void	AddAfter (LineNode *me, LineNode *add)
	Add a pointer after the point specified.
LineNode *	First ()
	Return the first point - null if empty.
const LineNode *	First () const
	Return the first point - null if empty.
void	SortToTop ()
	Sort so the positive direction will the left edge, and the negitive direction the right.
void	Bounds (grinliz::Rectangle2F *bounds)
	Compute the bounds of the loop.
void	Render (float *surface, int width, int height, bool fill=false)
	Draw the lineloop to a floating point surface, using 'value' in the line node.

---

Detailed Description

A representation of a closed 2D polygon as a series of points.

The "loop" is a true circular list - there are no nulls or sentinels. The next pointer is positive (counter-clock) and the prev pointer is negative (clock).

---

Member Function Documentation

void grinliz::LineLoop::AddAtEnd

(

LineNode *

node

)

Add a point at the end of the loop.

Normally a loop is created by:

frustum2D.Clear(); frustum2D.AddAtEnd( new LineNode( 0.0f, 0.0f ) ); frustum2D.AddAtEnd( new LineNode( (float)(VERTEXSIZE-1), 0.0f ) ); frustum2D.AddAtEnd( new LineNode( (float)(VERTEXSIZE-1), (float)(VERTEXSIZE-1) ) ); frustum2D.AddAtEnd( new LineNode( 0.0f, (float)(VERTEXSIZE-1) ) );

void grinliz::LineLoop::Render	(	float *	surface,
		int	width,
		int	height,
		bool	fill = false
	)

Draw the lineloop to a floating point surface, using 'value' in the line node.

Note that only fully included points will be drawn.

void grinliz::LineLoop::SortToTop

(

)

Sort so the positive direction will the left edge, and the negitive direction the right.

First() will point to the first left edge.

---

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

• glgeometry.h

---