CBox2DRenderer Class Reference

The Box2D renderer. More...

#include <Box2DRenderer.h>

Inheritance diagram for CBox2DRenderer:

Collaboration diagram for CBox2DRenderer:

Public Member Functions
	CBox2DRenderer (const UINT, const float)
	Constructor.
void	Drawb2Body (b2Body *)
	Draw Box2D body.

Protected Member Functions
void	Drawb2Shape (b2Shape *)
	Draw Box2D shape.
void	Drawb2Polygon (b2PolygonShape *)
	Draw Box2D polygon shape.
void	Drawb2Edge (b2EdgeShape *)
	Draw Box2D shape.
void	Drawb2Circle (b2CircleShape *)
	Draw Box2D edge shape.
void	Drawb2Chain (b2ChainShape *)
	Draw Box2D chain shape.

Private Member Functions
const float	PW2RW (const float) const
	Physics World to Render World.
const Vector2	PW2RW (const b2Vec2 &) const
	Physics World to Render World.

Private Attributes
UINT	m_nLineSprite = 0
	Line sprite.
Vector2	m_vPos
	Position in Render World.
float	m_fRoll = 0.0f
	Roll angle.
float	m_fPRS = 0.0f
	Physics World to Render World scale value.

Detailed Description

Adds to Sage::CSpriteRenderer the ability to draw Box2D shapes from a Box2D body.

Constructor & Destructor Documentation

CBox2DRenderer()

CBox2DRenderer::CBox2DRenderer	(	const UINT	n,
		const float	fPRS )

The constructor. Initialize the renderer into Sage::eSpriteMode::Batched2D and record the index of the line sprite and the Physics World to Render World scale value.

Parameters

n	index of the line sprite.
fPRS	Physics World to Render World scale value.

Member Function Documentation

Drawb2Body()

void CBox2DRenderer::Drawb2Body

(

b2Body *

pBody

)

Draw a Box2D body using lines. Iterate through the fixtures attached to the body, calling Drawb2Shape() to draw the shape of each fixture.

Parameters

pBody

Pointer to a Box2D body.

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Drawb2Chain()

void CBox2DRenderer::Drawb2Chain ( b2ChainShape * p )

protected

Draw a Box2D chain shape using lines. Assumes that eSprite::Line exists and has been loaded. This function is a stub that has not yet been implemented.

Parameters

p	Pointer to a Box2D chain shape.

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Drawb2Circle()

void CBox2DRenderer::Drawb2Circle ( b2CircleShape * p )

protected

Draw a Box2D circle shape.

Parameters

p	Pointer to a Box2D circle shape.

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Drawb2Edge()

void CBox2DRenderer::Drawb2Edge ( b2EdgeShape * p )

protected

Draw a Box2D edge shape as a line.

Parameters

p	Pointer to a Box2D edge shape.

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Drawb2Polygon()

void CBox2DRenderer::Drawb2Polygon ( b2PolygonShape * p )

protected

Draw a Box2D polygon shape using lines. Iterate through the polygon points, drawing a line from each one to the one before it. The line from the first point to the last one is a special case.

Parameters

p	Pointer to a Box2D polygon shape.

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Drawb2Shape()

void CBox2DRenderer::Drawb2Shape ( b2Shape * p )

protected

Draw a Box2D shape using lines. This is just a switch statement that calls one of Drawb2Circle(), Drawb2Edge(), Drawb2Polygon(), or Drawb2Chain() depending on the shape's type.

Parameters

p	Pointer to a Box2D shape.

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PW2RW() [1/2]

const Vector2 CBox2DRenderer::PW2RW ( const b2Vec2 & v ) const

private

Convert a vector in Physics World to the corresponding vector in Render World by multiplying by m_fPRS, the Physics World to Render World scale value.

Parameters

v	Physics World vector.

Returns

Render World vector.

PW2RW() [2/2]

const float CBox2DRenderer::PW2RW ( const float x ) const

private

Convert a distance in Physics World to the corresponding distance in Render World by multiplying by m_fPRS, the Physics World to Render World scale value.

Parameters

x	Physics World distance.

Returns

Render World distance.

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