104 lines
2.8 KiB
C++
104 lines
2.8 KiB
C++
/*
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* Copyright (c) 2006-2014 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 BASIC_SLIDER_CRANK_H
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#define BASIC_SLIDER_CRANK_H
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// A basic slider crank created for GDC tutorial: Understanding Constraints
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class BasicSliderCrank : public Test
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{
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public:
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BasicSliderCrank()
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{
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b2Body* ground = NULL;
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{
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b2BodyDef bd;
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bd.position.Set(0.0f, 17.0f);
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ground = m_world->CreateBody(&bd);
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}
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{
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b2Body* prevBody = ground;
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// Define crank.
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{
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b2PolygonShape shape;
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shape.SetAsBox(4.0f, 1.0f);
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b2BodyDef bd;
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bd.type = b2_dynamicBody;
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bd.position.Set(-8.0f, 20.0f);
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b2Body* body = m_world->CreateBody(&bd);
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body->CreateFixture(&shape, 2.0f);
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b2RevoluteJointDef rjd;
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rjd.Initialize(prevBody, body, b2Vec2(-12.0f, 20.0f));
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m_world->CreateJoint(&rjd);
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prevBody = body;
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}
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// Define connecting rod
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{
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b2PolygonShape shape;
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shape.SetAsBox(8.0f, 1.0f);
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b2BodyDef bd;
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bd.type = b2_dynamicBody;
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bd.position.Set(4.0f, 20.0f);
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b2Body* body = m_world->CreateBody(&bd);
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body->CreateFixture(&shape, 2.0f);
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b2RevoluteJointDef rjd;
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rjd.Initialize(prevBody, body, b2Vec2(-4.0f, 20.0f));
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m_world->CreateJoint(&rjd);
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prevBody = body;
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}
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// Define piston
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{
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b2PolygonShape shape;
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shape.SetAsBox(3.0f, 3.0f);
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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(12.0f, 20.0f);
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b2Body* body = m_world->CreateBody(&bd);
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body->CreateFixture(&shape, 2.0f);
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b2RevoluteJointDef rjd;
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rjd.Initialize(prevBody, body, b2Vec2(12.0f, 20.0f));
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m_world->CreateJoint(&rjd);
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b2PrismaticJointDef pjd;
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pjd.Initialize(ground, body, b2Vec2(12.0f, 17.0f), b2Vec2(1.0f, 0.0f));
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m_world->CreateJoint(&pjd);
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}
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}
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}
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static Test* Create()
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{
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return new BasicSliderCrank;
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}
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};
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#endif
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