1 /* 2 * Copyright (c) 2006-2009 Erin Catto http://www.box2d.org 3 * 4 * This software is provided 'as-is', without any express or implied 5 * warranty. In no event will the authors be held liable for any damages 6 * arising from the use of this software. 7 * Permission is granted to anyone to use this software for any purpose, 8 * including commercial applications, and to alter it and redistribute it 9 * freely, subject to the following restrictions: 10 * 1. The origin of this software must not be misrepresented; you must not 11 * claim that you wrote the original software. If you use this software 12 * in a product, an acknowledgment in the product documentation would be 13 * appreciated but is not required. 14 * 2. Altered source versions must be plainly marked as such, and must not be 15 * misrepresented as being the original software. 16 * 3. This notice may not be removed or altered from any source distribution. 17 */ 18 19 #ifndef VARYING_RESTITUTION_H 20 #define VARYING_RESTITUTION_H 21 22 // Note: even with a restitution of 1.0, there is some energy change 23 // due to position correction. 24 class VaryingRestitution : public Test 25 { 26 public: 27 VaryingRestitution()28 VaryingRestitution() 29 { 30 { 31 b2BodyDef bd; 32 b2Body* ground = m_world->CreateBody(&bd); 33 34 b2EdgeShape shape; 35 shape.Set(b2Vec2(-40.0f, 0.0f), b2Vec2(40.0f, 0.0f)); 36 ground->CreateFixture(&shape, 0.0f); 37 } 38 39 { 40 b2CircleShape shape; 41 shape.m_radius = 1.0f; 42 43 b2FixtureDef fd; 44 fd.shape = &shape; 45 fd.density = 1.0f; 46 47 float32 restitution[7] = {0.0f, 0.1f, 0.3f, 0.5f, 0.75f, 0.9f, 1.0f}; 48 49 for (int32 i = 0; i < 7; ++i) 50 { 51 b2BodyDef bd; 52 bd.type = b2_dynamicBody; 53 bd.position.Set(-10.0f + 3.0f * i, 20.0f); 54 55 b2Body* body = m_world->CreateBody(&bd); 56 57 fd.restitution = restitution[i]; 58 body->CreateFixture(&fd); 59 } 60 } 61 } 62 Create()63 static Test* Create() 64 { 65 return new VaryingRestitution; 66 } 67 }; 68 69 #endif 70