Box2D/Box2D/Dynamics/b2WorldCallbacks.h

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/*
* Copyright (c) 2006-2009 Erin Catto http://www.gphysics.com
*
* This software is provided 'as-is', without any express or implied
* warranty.  In no event will the authors be held liable for any damages
* arising from the use of this software.
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
*/

#ifndef B2_WORLD_CALLBACKS_H
#define B2_WORLD_CALLBACKS_H

#include <Box2D/Common/b2Settings.h>

struct b2Vec2;
struct b2Transform;
class b2Fixture;
class b2Body;
class b2Joint;
class b2Contact;
struct b2ContactPoint;
struct b2ContactResult;
struct b2Manifold;

class b2DestructionListener
{
public:
        virtual ~b2DestructionListener() {}

        virtual void SayGoodbye(b2Joint* joint) = 0;

        virtual void SayGoodbye(b2Fixture* fixture) = 0;
};

class b2ContactFilter
{
public:
        virtual ~b2ContactFilter() {}

        virtual bool ShouldCollide(b2Fixture* fixtureA, b2Fixture* fixtureB);
};

struct b2ContactImpulse
{
        float32 normalImpulses[b2_maxManifoldPoints];
        float32 tangentImpulses[b2_maxManifoldPoints];
};

class b2ContactListener
{
public:
        virtual ~b2ContactListener() {}

        virtual void BeginContact(b2Contact* contact) { B2_NOT_USED(contact); }

        virtual void EndContact(b2Contact* contact) { B2_NOT_USED(contact); }

        virtual void PreSolve(b2Contact* contact, const b2Manifold* oldManifold)
        {
                B2_NOT_USED(contact);
                B2_NOT_USED(oldManifold);
        }

        virtual void PostSolve(b2Contact* contact, const b2ContactImpulse* impulse)
        {
                B2_NOT_USED(contact);
                B2_NOT_USED(impulse);
        }
};

class b2QueryCallback
{
public:
        virtual ~b2QueryCallback() {}

        virtual bool ReportFixture(b2Fixture* fixture) = 0;
};

class b2RayCastCallback
{
public:
        virtual ~b2RayCastCallback() {}

        virtual float32 ReportFixture(  b2Fixture* fixture, const b2Vec2& point,
                                                                        const b2Vec2& normal, float32 fraction) = 0;
};

struct b2Color
{
        b2Color() {}
        b2Color(float32 r, float32 g, float32 b) : r(r), g(g), b(b) {}
        void Set(float32 ri, float32 gi, float32 bi) { r = ri; g = gi; b = bi; }
        float32 r, g, b;
};

class b2DebugDraw
{
public:
        b2DebugDraw();

        virtual ~b2DebugDraw() {}

        enum
        {
                e_shapeBit                              = 0x0001, 
                e_jointBit                              = 0x0002, 
                e_aabbBit                               = 0x0004, 
                e_pairBit                               = 0x0008, 
                e_centerOfMassBit               = 0x0010, 
        };

        void SetFlags(uint32 flags);

        uint32 GetFlags() const;
        
        void AppendFlags(uint32 flags);

        void ClearFlags(uint32 flags);

        virtual void DrawPolygon(const b2Vec2* vertices, int32 vertexCount, const b2Color& color) = 0;

        virtual void DrawSolidPolygon(const b2Vec2* vertices, int32 vertexCount, const b2Color& color) = 0;

        virtual void DrawCircle(const b2Vec2& center, float32 radius, const b2Color& color) = 0;
        
        virtual void DrawSolidCircle(const b2Vec2& center, float32 radius, const b2Vec2& axis, const b2Color& color) = 0;
        
        virtual void DrawSegment(const b2Vec2& p1, const b2Vec2& p2, const b2Color& color) = 0;

        virtual void DrawTransform(const b2Transform& xf) = 0;

protected:
        uint32 m_drawFlags;
};

#endif

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