Eaagles::BasicGL::Scanline Class Reference

Inherits Eaagles::Basic::LcObject.

Inheritance diagram for Eaagles::BasicGL::Scanline:

[legend]Collaboration diagram for Eaagles::BasicGL::Scanline:

[legend]List of all members.

Public Member Functions
	Scanline ()
void	scan ()
void	setArea (const LCreal xCenter, const LCreal yCenter, const LCreal xSize, const LCreal ySize, const LCreal zRotDeg)
unsigned int	getWidth () const
unsigned int	getHeight () const
void	setSize (const unsigned int width, const unsigned int height)
bool	addPolygon (const LcPolygon *const poly)
void	clear ()
Protected Member Functions
virtual void	callback (const PolyData *const p, const unsigned int x, const unsigned int y)=0
virtual void	reset ()
virtual void	scanline (const int y)
virtual const PolyData *	step (const int x)
virtual void	toggleActivePolygon ()
virtual unsigned int	reduceVert (LcPolygon *const poly)
virtual void	purgePolygons ()
virtual void	setMatrix ()
virtual void	sortEdges (Edge *tbl[], const int n, const int index)
virtual void	endPointCheck (Edge *tbl[], const int n) const
virtual void	add2EdgeTable (Edge *tbl[], const int n)
Private Attributes
Clip3D *	clipper
LCreal	angle
LCreal	cx
LCreal	cy
LCreal	sx
LCreal	sy
unsigned int	ix
unsigned int	iy
LCreal	curX
LCreal	curY
PolyData *	curPoly
osg::Matrix	mat
PolyData *	pt [MAX_POLYS]
unsigned int	nPT
PolyData *	apt [MAX_ACTIVE_POLYS]
unsigned int	nAPT
Edge *	et [MAX_EDGES]
unsigned int	nET
unsigned int	refET
Edge *	aet [MAX_ACTIVE_EDGES]
unsigned int	nAET
unsigned int	refAET
Static Private Attributes
static const unsigned int	MAX_EDGES = 4000
static const unsigned int	MAX_ACTIVE_EDGES = 1000
static const unsigned int	MAX_POLYS = 500
static const unsigned int	MAX_ACTIVE_POLYS = 100
Classes
class	Edge
class	PolyData

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Detailed Description

(Abstract) 2D scan line engine.  

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Constructor & Destructor Documentation

Eaagles::BasicGL::Scanline::Scanline

(

)

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Member Function Documentation

void Eaagles::BasicGL::Scanline::scan

(

)

Generates one scan of the 'world'. The user defined 'callback()' function (via the derived class) is called at each x,y point in the virtual view port.

void Eaagles::BasicGL::Scanline::setArea	(	const LCreal	xCenter,
		const LCreal	yCenter,
		const LCreal	xSize,
		const LCreal	ySize,
		const LCreal	zRotDeg
	)

Defines the area that we're going to scan.

unsigned int Eaagles::BasicGL::Scanline::getWidth

(

)

const [inline]

Viewport (image) width -- pixels.

unsigned int Eaagles::BasicGL::Scanline::getHeight

(

)

const [inline]

viewport (image) height -- lines

void Eaagles::BasicGL::Scanline::setSize	(	const unsigned int	width,
		const unsigned int	height
	)

Sets the viewport size.

bool Eaagles::BasicGL::Scanline::addPolygon

(

const LcPolygon *const

poly

)

adds a polygon to the 'world'

void Eaagles::BasicGL::Scanline::clear

(

)

empty all the tables

virtual void Eaagles::BasicGL::Scanline::callback	(	const PolyData *const	p,
		const unsigned int	x,
		const unsigned int	y
	)			[protected, pure virtual]

void Eaagles::BasicGL::Scanline::reset

(

)

[protected, virtual]

reset the scanline alg but keep the polygon and edge tables

void Eaagles::BasicGL::Scanline::scanline

(

const int

y

)

[protected, virtual]

select the scanline and setup the AET

const Scanline::PolyData * Eaagles::BasicGL::Scanline::step

(

const int

x

)

[protected, virtual]

step down the scan line to x

void Eaagles::BasicGL::Scanline::toggleActivePolygon

(

)

[protected, virtual]

toggle a polygon to and from the active table

unsigned int Eaagles::BasicGL::Scanline::reduceVert

(

LcPolygon *const

poly

)

[protected, virtual]

reduce the number of vertices by removing consecutive vertices that are on the same pixel

void Eaagles::BasicGL::Scanline::purgePolygons

(

)

[protected, virtual]

purge the active polygon list of polygons that have reached the seconds edge

void Eaagles::BasicGL::Scanline::setMatrix

(

)

[protected, virtual]

define the transformation matrix

void Eaagles::BasicGL::Scanline::sortEdges	(	Edge *	tbl[],
		const int	n,
		const int	index
	)			[protected, virtual]

sort the edge table; simple bubble up sort. If index == 0, sort by x. If index == 1, sort by lv[1]

void Eaagles::BasicGL::Scanline::endPointCheck	(	Edge *	tbl[],
		const int	n
	)			const [protected, virtual]

end point check the edges

void Eaagles::BasicGL::Scanline::add2EdgeTable	(	Edge *	tbl[],
		const int	n
	)			[protected, virtual]

add the edges to the edge table

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Member Data Documentation

const unsigned int Eaagles::BasicGL::Scanline::MAX_EDGES = 4000 [static, private]

const unsigned int Eaagles::BasicGL::Scanline::MAX_ACTIVE_EDGES = 1000 [static, private]

const unsigned int Eaagles::BasicGL::Scanline::MAX_POLYS = 500 [static, private]

const unsigned int Eaagles::BasicGL::Scanline::MAX_ACTIVE_POLYS = 100 [static, private]

Clip3D* Eaagles::BasicGL::Scanline::clipper [private]

clipping object

LCreal Eaagles::BasicGL::Scanline::angle [private]

area rotation angle (radians)

LCreal Eaagles::BasicGL::Scanline::cx [private]

area center (x,y)

LCreal Eaagles::BasicGL::Scanline::cy [private]

LCreal Eaagles::BasicGL::Scanline::sx [private]

area size (x,y)

LCreal Eaagles::BasicGL::Scanline::sy [private]

unsigned int Eaagles::BasicGL::Scanline::ix [private]

number of pixels (x,y)

unsigned int Eaagles::BasicGL::Scanline::iy [private]

LCreal Eaagles::BasicGL::Scanline::curX [private]

current X value (pixel number)

LCreal Eaagles::BasicGL::Scanline::curY [private]

current Y value (scanline number)

PolyData* Eaagles::BasicGL::Scanline::curPoly [private]

Current polygon (one on top).

osg::Matrix Eaagles::BasicGL::Scanline::mat [private]

matrix used by scanner

PolyData* Eaagles::BasicGL::Scanline::pt[MAX_POLYS] [private]

Polygons Table (PT).

unsigned int Eaagles::BasicGL::Scanline::nPT [private]

Number of polygons in PT.

PolyData* Eaagles::BasicGL::Scanline::apt[MAX_ACTIVE_POLYS] [private]

Active Polygon Table (APT).

unsigned int Eaagles::BasicGL::Scanline::nAPT [private]

Number of polygons in APT.

Edge* Eaagles::BasicGL::Scanline::et[MAX_EDGES] [private]

Edge Table (ET).

unsigned int Eaagles::BasicGL::Scanline::nET [private]

Number of edges in ET.

unsigned int Eaagles::BasicGL::Scanline::refET [private]

Ref index for ET.

Edge* Eaagles::BasicGL::Scanline::aet[MAX_ACTIVE_EDGES] [private]

Active Edge Table (AET).

unsigned int Eaagles::BasicGL::Scanline::nAET [private]

Number of edges in AET.

unsigned int Eaagles::BasicGL::Scanline::refAET [private]

Ref index for AET.

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