--- /dev/null
+/*
+* Copyright (c) 2006-2007 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 "../Common/b2Settings.h"
+
+struct b2Vec2;
+struct b2XForm;
+class b2Shape;
+class b2Body;
+class b2Joint;
+class b2Contact;
+struct b2ContactPoint;
+struct b2ContactResult;
+
+/// Joints and shapes are destroyed when their associated
+/// body is destroyed. Implement this listener so that you
+/// may nullify references to these joints and shapes.
+class b2DestructionListener
+{
+public:
+ virtual ~b2DestructionListener() {}
+
+ /// Called when any joint is about to be destroyed due
+ /// to the destruction of one of its attached bodies.
+ virtual void SayGoodbye(b2Joint* joint) = 0;
+
+ /// Called when any shape is about to be destroyed due
+ /// to the destruction of its parent body.
+ virtual void SayGoodbye(b2Shape* shape) = 0;
+};
+
+
+/// This is called when a body's shape passes outside of the world boundary.
+class b2BoundaryListener
+{
+public:
+ virtual ~b2BoundaryListener() {}
+
+ /// This is called for each body that leaves the world boundary.
+ /// @warning you can't modify the world inside this callback.
+ virtual void Violation(b2Body* body) = 0;
+};
+
+
+/// Implement this class to provide collision filtering. In other words, you can implement
+/// this class if you want finer control over contact creation.
+class b2ContactFilter
+{
+public:
+ virtual ~b2ContactFilter() {}
+
+ /// Return true if contact calculations should be performed between these two shapes.
+ /// @warning for performance reasons this is only called when the AABBs begin to overlap.
+ virtual bool ShouldCollide(b2Shape* shape1, b2Shape* shape2);
+};
+
+/// The default contact filter.
+extern b2ContactFilter b2_defaultFilter;
+
+/// Implement this class to get collision results. You can use these results for
+/// things like sounds and game logic. You can also get contact results by
+/// traversing the contact lists after the time step. However, you might miss
+/// some contacts because continuous physics leads to sub-stepping.
+/// Additionally you may receive multiple callbacks for the same contact in a
+/// single time step.
+/// You should strive to make your callbacks efficient because there may be
+/// many callbacks per time step.
+/// @warning The contact separation is the last computed value.
+/// @warning You cannot create/destroy Box2D entities inside these callbacks.
+class b2ContactListener
+{
+public:
+ virtual ~b2ContactListener() {}
+
+ /// Called when a contact point is added. This includes the geometry
+ /// and the forces.
+ virtual void Add(const b2ContactPoint* point) { B2_NOT_USED(point); }
+
+ /// Called when a contact point persists. This includes the geometry
+ /// and the forces.
+ virtual void Persist(const b2ContactPoint* point) { B2_NOT_USED(point); }
+
+ /// Called when a contact point is removed. This includes the last
+ /// computed geometry and forces.
+ virtual void Remove(const b2ContactPoint* point) { B2_NOT_USED(point); }
+
+ /// Called after a contact point is solved.
+ virtual void Result(const b2ContactResult* point) { B2_NOT_USED(point); }
+};
+
+/// Color for debug drawing. Each value has the range [0,1].
+struct b2Color
+{
+ b2Color() {}
+ b2Color(float32 r, float32 g, float32 b) : r(r), g(g), b(b) {}
+ float32 r, g, b;
+};
+
+/// Implement and register this class with a b2World to provide debug drawing of physics
+/// entities in your game.
+class b2DebugDraw
+{
+public:
+ b2DebugDraw();
+
+ virtual ~b2DebugDraw() {}
+
+ enum
+ {
+ e_shapeBit = 0x0001, ///< draw shapes
+ e_jointBit = 0x0002, ///< draw joint connections
+ e_coreShapeBit = 0x0004, ///< draw core (TOI) shapes
+ e_aabbBit = 0x0008, ///< draw axis aligned bounding boxes
+ e_obbBit = 0x0010, ///< draw oriented bounding boxes
+ e_pairBit = 0x0020, ///< draw broad-phase pairs
+ e_centerOfMassBit = 0x0040, ///< draw center of mass frame
+ };
+
+ /// Set the drawing flags.
+ void SetFlags(uint32 flags);
+
+ /// Get the drawing flags.
+ uint32 GetFlags() const;
+
+ /// Append flags to the current flags.
+ void AppendFlags(uint32 flags);
+
+ /// Clear flags from the current flags.
+ void ClearFlags(uint32 flags);
+
+ /// Draw a closed polygon provided in CCW order.
+ virtual void DrawPolygon(const b2Vec2* vertices, int32 vertexCount, const b2Color& color) = 0;
+
+ /// Draw a solid closed polygon provided in CCW order.
+ virtual void DrawSolidPolygon(const b2Vec2* vertices, int32 vertexCount, const b2Color& color) = 0;
+
+ /// Draw a circle.
+ virtual void DrawCircle(const b2Vec2& center, float32 radius, const b2Color& color) = 0;
+
+ /// Draw a solid circle.
+ virtual void DrawSolidCircle(const b2Vec2& center, float32 radius, const b2Vec2& axis, const b2Color& color) = 0;
+
+ /// Draw a line segment.
+ virtual void DrawSegment(const b2Vec2& p1, const b2Vec2& p2, const b2Color& color) = 0;
+
+ /// Draw a transform. Choose your own length scale.
+ /// @param xf a transform.
+ virtual void DrawXForm(const b2XForm& xf) = 0;
+
+protected:
+ uint32 m_drawFlags;
+};
+
+#endif
projects / blok / blobdiff