mirror of https://github.com/axmolengine/axmol.git
115 lines
2.7 KiB
C++
115 lines
2.7 KiB
C++
/*
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* Copyright (c) 2006-2012 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 MOTOR_JOINT_H
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#define MOTOR_JOINT_H
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/// This test shows how to use a motor joint. A motor joint
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/// can be used to animate a dynamic body. With finite motor forces
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/// the body can be blocked by collision with other bodies.
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class MotorJoint : public Test
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{
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public:
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MotorJoint()
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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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ground = m_world->CreateBody(&bd);
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b2EdgeShape shape;
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shape.Set(b2Vec2(-20.0f, 0.0f), b2Vec2(20.0f, 0.0f));
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b2FixtureDef fd;
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fd.shape = &shape;
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ground->CreateFixture(&fd);
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}
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// Define motorized body
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{
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b2BodyDef bd;
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bd.type = b2_dynamicBody;
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bd.position.Set(0.0f, 8.0f);
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b2Body* body = m_world->CreateBody(&bd);
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b2PolygonShape shape;
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shape.SetAsBox(2.0f, 0.5f);
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b2FixtureDef fd;
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fd.shape = &shape;
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fd.friction = 0.6f;
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fd.density = 2.0f;
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body->CreateFixture(&fd);
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b2MotorJointDef mjd;
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mjd.Initialize(ground, body);
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mjd.maxForce = 1000.0f;
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mjd.maxTorque = 1000.0f;
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m_joint = (b2MotorJoint*)m_world->CreateJoint(&mjd);
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}
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m_go = false;
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m_time = 0.0f;
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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 's':
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m_go = !m_go;
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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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if (m_go && settings->hz > 0.0f)
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{
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m_time += 1.0f / settings->hz;
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}
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b2Vec2 linearOffset;
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linearOffset.x = 6.0f * sinf(2.0f * m_time);
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linearOffset.y = 8.0f + 4.0f * sinf(1.0f * m_time);
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float32 angularOffset = 4.0f * m_time;
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m_joint->SetLinearOffset(linearOffset);
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m_joint->SetAngularOffset(angularOffset);
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m_debugDraw.DrawPoint(linearOffset, 4.0f, b2Color(0.9f, 0.9f, 0.9f));
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Test::Step(settings);
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m_debugDraw.DrawString(5, m_textLine, "Keys: (s) pause");
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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 MotorJoint;
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}
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b2MotorJoint* m_joint;
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float32 m_time;
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bool m_go;
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};
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#endif
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