Rasterizer2D Class Reference

#include <Rasterizer2D.h>

Public Member Functions
	Rasterizer2D (FrameBuffer *fb)
void	clear (const Color &color)
void	drawLine (const Matrix< 2, 1 > &p, const Matrix< 2, 1 > &q, const Color &color)
void	drawPoint (int x, int y, const Color &color)
void	drawPoint (const Matrix< 2, 1 > &point, const Color &color)
void	drawQuadrilateral (const Matrix< 2, 4 > &quad, const Color &color)
void	drawTriangle (const Matrix< 2, 3 > &triangle, const Color &color)
void	fillQuadrilateral (const Matrix< 2, 4 > &quad, const Color &color)
void	fillTriangle (const Matrix< 2, 3 > &triangle, const Color &color)
void	pointwiseFillQuadrilateral (const Matrix< 2, 4 > &quad, const Color &color)
void	pointwiseFillTriangle (const Matrix< 2, 3 > &triangle, const Color &color)

Static Public Attributes
static const int	SCAN_LINE = 0
static const int	POINTWISE = 1

Private Attributes
FrameBuffer *	fb
int	fillTechnique

Detailed Description

An encapsulation of objects that can render various 2-D shapes.

Note: Since we don't need to transform points, they are in Cartesian (rather than homogeneous) coordinates and stored in a Matrix<2, 1> (i.e., a 2-element column vector which is the same as a Vector<2>).

Constructor & Destructor Documentation

Rasterizer2D()

Rasterizer2D::Rasterizer2D ( FrameBuffer *  fb )

explicit

Explicit Value Constructor.

Parameters

fb	A pointer to the FrameBuffer to use

Member Function Documentation

clear()

void Rasterizer2D::clear

(

const Color &

color

)

Fill the entire FrameBuffer with the given color.

Parameters

color

The Color to use

drawLine()

void Rasterizer2D::drawLine	(	const Matrix< 2, 1 > &	p,
		const Matrix< 2, 1 > &	q,
		const Color &	color
	)

Draw a line using the (non-incremental) parametric approach.

Parameters

p	One end point
q	The other end point
color	The color to use

drawPoint() [1/2]

void Rasterizer2D::drawPoint	(	int	x,
		int	y,
		const Color &	color
	)

Set the color of a single pixel.

Parameters

x	The horizontal coordinate
y	The vertical coordinate
color	The Color to use

drawPoint() [2/2]

void Rasterizer2D::drawPoint	(	const Matrix< 2, 1 > &	point,
		const Color &	color
	)

Set the color of a single pixel.

Parameters

point	The point
color	The Color to use

drawQuadrilateral()

void Rasterizer2D::drawQuadrilateral	(	const Matrix< 2, 4 > &	quad,
		const Color &	color
	)

Draw the edges of a quadrilateral.

Parameters

quad	The vertices of the quadrilateral
color	The color to use

drawTriangle()

void Rasterizer2D::drawTriangle	(	const Matrix< 2, 3 > &	triangle,
		const Color &	color
	)

Draw the edges of a triangle.

Parameters

triangle	The vertices of the triangle
color	The color to use

fillQuadrilateral()

void Rasterizer2D::fillQuadrilateral	(	const Matrix< 2, 4 > &	quad,
		const Color &	color
	)

Fill a quadrilateral.

Parameters

quad	The vertices of the quadrilateral
color	The color to use

fillTriangle()

void Rasterizer2D::fillTriangle	(	const Matrix< 2, 3 > &	triangle,
		const Color &	color
	)

Fill a triangle.

Parameters

triangle	The vertices of the triangle
color	The color to use

pointwiseFillQuadrilateral()

void Rasterizer2D::pointwiseFillQuadrilateral	(	const Matrix< 2, 4 > &	quad,
		const Color &	color
	)

Fill a quadrilateral by testing all of the points in its bounding rectangle using the halfspace test.

Parameters

quad	The vertices of the quadrilateral
color	The color to use

pointwiseFillTriangle()

void Rasterizer2D::pointwiseFillTriangle	(	const Matrix< 2, 3 > &	triangle,
		const Color &	color
	)

Fill a triangle point-by-point in the given color using the signed-area algorithm.

Parameters

triangle	The vertices of the triangle
color	The color to use

Member Data Documentation

fb

FrameBuffer* Rasterizer2D::fb

private

The FrameBuffer to use.

fillTechnique

int Rasterizer2D::fillTechnique

private

The fill alorithm to use (SCAN_LINE or POINTWISE)

POINTWISE

const int Rasterizer2D::POINTWISE = 1

static

A constant indicating that a pointwise algorithm should be used.

SCAN_LINE

const int Rasterizer2D::SCAN_LINE = 0

static

A constant indicating that a scan-line algorithm should be used.

---

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

• Rasterizer2D.h
• Rasterizer2D.cpp