107 lines
3.1 KiB
C
107 lines
3.1 KiB
C
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/*
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* Copyright (c) 2007-2009 Erin Catto http://www.box2d.org
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*
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* This software is provided 'as-is', without any express or implied
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* warranty. In no event will the authors be held liable for any damages
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* arising from the use of this software.
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software. If you use this software
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* in a product, an acknowledgment in the product documentation would be
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* appreciated but is not required.
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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* 3. This notice may not be removed or altered from any source distribution.
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*/
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#ifndef PULLEYS_H
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#define PULLEYS_H
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class Pulleys : public Test
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{
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public:
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Pulleys()
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{
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float32 y = 16.0f;
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float32 L = 12.0f;
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float32 a = 1.0f;
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float32 b = 2.0f;
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b2Body* ground = NULL;
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{
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b2BodyDef bd;
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ground = m_world->CreateBody(&bd);
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b2EdgeShape edge;
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edge.Set(b2Vec2(-40.0f, 0.0f), b2Vec2(40.0f, 0.0f));
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//ground->CreateFixture(&shape, 0.0f);
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b2CircleShape circle;
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circle.m_radius = 2.0f;
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circle.m_p.Set(-10.0f, y + b + L);
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ground->CreateFixture(&circle, 0.0f);
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circle.m_p.Set(10.0f, y + b + L);
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ground->CreateFixture(&circle, 0.0f);
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}
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{
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b2PolygonShape shape;
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shape.SetAsBox(a, b);
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b2BodyDef bd;
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bd.type = b2_dynamicBody;
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//bd.fixedRotation = true;
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bd.position.Set(-10.0f, y);
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b2Body* body1 = m_world->CreateBody(&bd);
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body1->CreateFixture(&shape, 5.0f);
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bd.position.Set(10.0f, y);
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b2Body* body2 = m_world->CreateBody(&bd);
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body2->CreateFixture(&shape, 5.0f);
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b2PulleyJointDef pulleyDef;
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b2Vec2 anchor1(-10.0f, y + b);
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b2Vec2 anchor2(10.0f, y + b);
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b2Vec2 groundAnchor1(-10.0f, y + b + L);
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b2Vec2 groundAnchor2(10.0f, y + b + L);
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pulleyDef.Initialize(body1, body2, groundAnchor1, groundAnchor2, anchor1, anchor2, 1.5f);
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m_joint1 = (b2PulleyJoint*)m_world->CreateJoint(&pulleyDef);
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}
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}
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void Keyboard(unsigned char key)
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{
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switch (key)
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{
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case 0:
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break;
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}
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}
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void Step(Settings* settings)
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{
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Test::Step(settings);
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float32 ratio = m_joint1->GetRatio();
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float32 L = m_joint1->GetLengthA() + ratio * m_joint1->GetLengthB();
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m_debugDraw.DrawString(5, m_textLine, "L1 + %4.2f * L2 = %4.2f", (float) ratio, (float) L);
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m_textLine += 15;
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}
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static Test* Create()
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{
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return new Pulleys;
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}
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b2PulleyJoint* m_joint1;
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};
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#endif
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