This class implements debug drawing callbacks that are invoked inside b2World::Step. More...

#include <render.hpp>

Public Member Functions
void	DrawPolygon (const b2Vec2 *vertices, int32 vertexCount, const b2Color &color)
void	DrawSolidPolygon (const b2Vec2 *vertices, int32 vertexCount, const b2Color &color)
void	DrawCircle (const b2Vec2 &center, float32 radius, const b2Color &color)
void	DrawSolidCircle (const b2Vec2 &center, float32 radius, const b2Vec2 &axis, const b2Color &color)
void	DrawSegment (const b2Vec2 &p1, const b2Vec2 &p2, const b2Color &color)
void	DrawTransform (const b2Transform &xf)
void	DrawPoint (const b2Vec2 &p, float32 size, const b2Color &color)
void	DrawString (int x, int y, const char *string,...)
void	DrawAABB (b2AABB *aabb, const b2Color &color)

Detailed Description

This class implements debug drawing callbacks that are invoked inside b2World::Step.

Definition at line 35 of file render.hpp.

Member Function Documentation

void debug_draw_t::DrawAABB	(	b2AABB *	aabb,
		const b2Color &	color
	)

Definition at line 195 of file render.cpp.

{
    glColor3f(c.r, c.g, c.b);
    glBegin(GL_LINE_LOOP);
    glVertex2f(aabb->lowerBound.x, aabb->lowerBound.y);
    glVertex2f(aabb->upperBound.x, aabb->lowerBound.y);
    glVertex2f(aabb->upperBound.x, aabb->upperBound.y);
    glVertex2f(aabb->lowerBound.x, aabb->upperBound.y);
    glEnd();
}

void debug_draw_t::DrawCircle	(	const b2Vec2 &	center,
		float32	radius,
		const b2Color &	color
	)

Definition at line 72 of file render.cpp.

{
    const float32 k_segments = 16.0f;
    const float32 k_increment = 2.0f * b2_pi / k_segments;
    float32 theta = 0.0f;
    glColor3f(color.r, color.g, color.b);
    glBegin(GL_LINE_LOOP);
    for (int32 i = 0; i < k_segments; ++i)
    {
        b2Vec2 v = center + radius * b2Vec2(cosf(theta), sinf(theta));
        glVertex2f(v.x, v.y);
        theta += k_increment;
    }
    glEnd();
}

void debug_draw_t::DrawPoint	(	const b2Vec2 &	p,
		float32	size,
		const b2Color &	color
	)

Definition at line 152 of file render.cpp.

{
    glPointSize(size);
    glBegin(GL_POINTS);
    glColor3f(color.r, color.g, color.b);
    glVertex2f(p.x, p.y);
    glEnd();
    glPointSize(1.0f);
}

void debug_draw_t::DrawPolygon	(	const b2Vec2 *	vertices,
		int32	vertexCount,
		const b2Color &	color
	)

Definition at line 39 of file render.cpp.

{
    glColor3f(color.r, color.g, color.b);
    glBegin(GL_LINE_LOOP);
    for (int32 i = 0; i < vertexCount; ++i)
    {
        glVertex2f(vertices[i].x, vertices[i].y);
    }
    glEnd();
}

void debug_draw_t::DrawSegment	(	const b2Vec2 &	p1,
		const b2Vec2 &	p2,
		const b2Color &	color
	)

Definition at line 124 of file render.cpp.

{
    glColor3f(color.r, color.g, color.b);
    glBegin(GL_LINES);
    glVertex2f(p1.x, p1.y);
    glVertex2f(p2.x, p2.y);
    glEnd();
}

void debug_draw_t::DrawSolidCircle	(	const b2Vec2 &	center,
		float32	radius,
		const b2Vec2 &	axis,
		const b2Color &	color
	)

Definition at line 88 of file render.cpp.

{
    const float32 k_segments = 16.0f;
    const float32 k_increment = 2.0f * b2_pi / k_segments;
    float32 theta = 0.0f;
    glEnable(GL_BLEND);
    glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
    glColor4f(0.5f * color.r, 0.5f * color.g, 0.5f * color.b, 0.5f);
    glBegin(GL_TRIANGLE_FAN);
    for (int32 i = 0; i < k_segments; ++i)
    {
        b2Vec2 v = center + radius * b2Vec2(cosf(theta), sinf(theta));
        glVertex2f(v.x, v.y);
        theta += k_increment;
    }
    glEnd();
    glDisable(GL_BLEND);

    theta = 0.0f;
    glColor4f(color.r, color.g, color.b, 1.0f);
    glBegin(GL_LINE_LOOP);
    for (int32 i = 0; i < k_segments; ++i)
    {
        b2Vec2 v = center + radius * b2Vec2(cosf(theta), sinf(theta));
        glVertex2f(v.x, v.y);
        theta += k_increment;
    }
    glEnd();

    b2Vec2 p = center + radius * axis;
    glBegin(GL_LINES);
    glVertex2f(center.x, center.y);
    glVertex2f(p.x, p.y);
    glEnd();
}

void debug_draw_t::DrawSolidPolygon	(	const b2Vec2 *	vertices,
		int32	vertexCount,
		const b2Color &	color
	)

Definition at line 50 of file render.cpp.

{
    glEnable(GL_BLEND);
    glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
    glColor4f(0.5f * color.r, 0.5f * color.g, 0.5f * color.b, 0.5f);
    glBegin(GL_TRIANGLE_FAN);
    for (int32 i = 0; i < vertexCount; ++i)
    {
        glVertex2f(vertices[i].x, vertices[i].y);
    }
    glEnd();
    glDisable(GL_BLEND);

    glColor4f(color.r, color.g, color.b, 1.0f);
    glBegin(GL_LINE_LOOP);
    for (int32 i = 0; i < vertexCount; ++i)
    {
        glVertex2f(vertices[i].x, vertices[i].y);
    }
    glEnd();
}

void debug_draw_t::DrawString	(	int	x,
		int	y,
		const char *	string,
			...
	)

Definition at line 162 of file render.cpp.

{
    char buffer[128];

    va_list arg;
    va_start(arg, string);
    vsprintf(buffer, string, arg);
    va_end(arg);

    glMatrixMode(GL_PROJECTION);
    glPushMatrix();
    glLoadIdentity();
    int w = glutGet(GLUT_WINDOW_WIDTH);
    int h = glutGet(GLUT_WINDOW_HEIGHT);
    gluOrtho2D(0, w, h, 0);
    glMatrixMode(GL_MODELVIEW);
    glPushMatrix();
    glLoadIdentity();

    glColor3f(0.9f, 0.6f, 0.6f);
    glRasterPos2i(x, y);
    int32 length = (int32)strlen(buffer);
    for (int32 i = 0; i < length; ++i)
    {
        glutBitmapCharacter(GLUT_BITMAP_8_BY_13, buffer[i]);
    }

    glPopMatrix();
    glMatrixMode(GL_PROJECTION);
    glPopMatrix();
    glMatrixMode(GL_MODELVIEW);
}

void debug_draw_t::DrawTransform ( const b2Transform & xf )

Definition at line 133 of file render.cpp.

{
    b2Vec2 p1 = xf.p, p2;
    const float32 k_axisScale = 0.4f;
    glBegin(GL_LINES);
    
    glColor3f(1.0f, 0.0f, 0.0f);
    glVertex2f(p1.x, p1.y);
    p2 = p1 + k_axisScale * xf.q.GetXAxis();
    glVertex2f(p2.x, p2.y);

    glColor3f(0.0f, 1.0f, 0.0f);
    glVertex2f(p1.x, p1.y);
    p2 = p1 + k_axisScale * xf.q.GetYAxis();
    glVertex2f(p2.x, p2.y);

    glEnd();
}

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

src/render.hpp
src/render.cpp

Public Member Functions

Detailed Description

Member Function Documentation