Refences

class QB2Draw : public b2Draw, QObject

public method:

QB2Draw(QRect displayGeometry,QPainter * p=NULL); //Constructor: Display geometry and painter

//void setScale(float sx=1.0, float sy=1.0); TODO
void DrawPolygon(const b2Vec2 *vertices, int32 vertexCount, const b2Color &color); //Draw a polyline
void DrawSolidPolygon(const b2Vec2 *vertices, int32 vertexCount, const b2Color &color); //Draw a polygone
void DrawCircle(const b2Vec2 &center, float32 radius, const b2Color &color); //Draw a circonference
void DrawSolidCircle(const b2Vec2 &center, float32 radius, const b2Vec2 &axis, const b2Color &color); //Draw a circle
void DrawSegment(const b2Vec2 &p1, const b2Vec2 &p2, const b2Color &color); //Draw a line
void DrawTransform(const b2Transform &xf); //Set a transformate (translate and rotate)

private propi:

QPainter * painter; //The painter
QRect geometry; //The geometry

QPoint toQPoint(b2Vec2 vec); //To convert b2vec2 in QPoint (and also change the coordinate system)
QColor toQColor(b2Color color); //To convert b2Color in QColor

public slots:

void updateGeometry(QRect displayGeometry); //Update the geometry
void setPainter(QPainter * p); //Set the painter