1 /* 2 * Copyright (c) 2007-2009 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 PULLEYS_H 20 #define PULLEYS_H 21 22 class Pulleys : public Test 23 { 24 public: Pulleys()25 Pulleys() 26 { 27 float32 y = 16.0f; 28 float32 L = 12.0f; 29 float32 a = 1.0f; 30 float32 b = 2.0f; 31 32 b2Body* ground = NULL; 33 { 34 b2BodyDef bd; 35 ground = m_world->CreateBody(&bd); 36 37 b2EdgeShape edge; 38 edge.Set(b2Vec2(-40.0f, 0.0f), b2Vec2(40.0f, 0.0f)); 39 //ground->CreateFixture(&shape, 0.0f); 40 41 b2CircleShape circle; 42 circle.m_radius = 2.0f; 43 44 circle.m_p.Set(-10.0f, y + b + L); 45 ground->CreateFixture(&circle, 0.0f); 46 47 circle.m_p.Set(10.0f, y + b + L); 48 ground->CreateFixture(&circle, 0.0f); 49 } 50 51 { 52 53 b2PolygonShape shape; 54 shape.SetAsBox(a, b); 55 56 b2BodyDef bd; 57 bd.type = b2_dynamicBody; 58 59 //bd.fixedRotation = true; 60 bd.position.Set(-10.0f, y); 61 b2Body* body1 = m_world->CreateBody(&bd); 62 body1->CreateFixture(&shape, 5.0f); 63 64 bd.position.Set(10.0f, y); 65 b2Body* body2 = m_world->CreateBody(&bd); 66 body2->CreateFixture(&shape, 5.0f); 67 68 b2PulleyJointDef pulleyDef; 69 b2Vec2 anchor1(-10.0f, y + b); 70 b2Vec2 anchor2(10.0f, y + b); 71 b2Vec2 groundAnchor1(-10.0f, y + b + L); 72 b2Vec2 groundAnchor2(10.0f, y + b + L); 73 pulleyDef.Initialize(body1, body2, groundAnchor1, groundAnchor2, anchor1, anchor2, 1.5f); 74 75 m_joint1 = (b2PulleyJoint*)m_world->CreateJoint(&pulleyDef); 76 } 77 } 78 Keyboard(unsigned char key)79 void Keyboard(unsigned char key) 80 { 81 switch (key) 82 { 83 case 0: 84 break; 85 } 86 } 87 Step(Settings * settings)88 void Step(Settings* settings) 89 { 90 Test::Step(settings); 91 92 float32 ratio = m_joint1->GetRatio(); 93 float32 L = m_joint1->GetLengthA() + ratio * m_joint1->GetLengthB(); 94 m_debugDraw.DrawString(5, m_textLine, "L1 + %4.2f * L2 = %4.2f", (float) ratio, (float) L); 95 m_textLine += 15; 96 } 97 Create()98 static Test* Create() 99 { 100 return new Pulleys; 101 } 102 103 b2PulleyJoint* m_joint1; 104 }; 105 106 #endif 107