210 lines
6.8 KiB
C
210 lines
6.8 KiB
C
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/*
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* Copyright (c) 2006-2009 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 WEB_H
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#define WEB_H
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// This tests distance joints, body destruction, and joint destruction.
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class Web : public Test
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{
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public:
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Web()
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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(-40.0f, 0.0f), b2Vec2(40.0f, 0.0f));
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ground->CreateFixture(&shape, 0.0f);
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}
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{
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b2PolygonShape shape;
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shape.SetAsBox(0.5f, 0.5f);
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b2BodyDef bd;
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bd.type = b2_dynamicBody;
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bd.position.Set(-5.0f, 5.0f);
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m_bodies[0] = m_world->CreateBody(&bd);
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m_bodies[0]->CreateFixture(&shape, 5.0f);
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bd.position.Set(5.0f, 5.0f);
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m_bodies[1] = m_world->CreateBody(&bd);
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m_bodies[1]->CreateFixture(&shape, 5.0f);
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bd.position.Set(5.0f, 15.0f);
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m_bodies[2] = m_world->CreateBody(&bd);
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m_bodies[2]->CreateFixture(&shape, 5.0f);
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bd.position.Set(-5.0f, 15.0f);
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m_bodies[3] = m_world->CreateBody(&bd);
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m_bodies[3]->CreateFixture(&shape, 5.0f);
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b2DistanceJointDef jd;
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b2Vec2 p1, p2, d;
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jd.frequencyHz = 2.0f;
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jd.dampingRatio = 0.0f;
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jd.bodyA = ground;
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jd.bodyB = m_bodies[0];
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jd.localAnchorA.Set(-10.0f, 0.0f);
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jd.localAnchorB.Set(-0.5f, -0.5f);
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p1 = jd.bodyA->GetWorldPoint(jd.localAnchorA);
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p2 = jd.bodyB->GetWorldPoint(jd.localAnchorB);
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d = p2 - p1;
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jd.length = d.Length();
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m_joints[0] = m_world->CreateJoint(&jd);
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jd.bodyA = ground;
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jd.bodyB = m_bodies[1];
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jd.localAnchorA.Set(10.0f, 0.0f);
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jd.localAnchorB.Set(0.5f, -0.5f);
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p1 = jd.bodyA->GetWorldPoint(jd.localAnchorA);
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p2 = jd.bodyB->GetWorldPoint(jd.localAnchorB);
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d = p2 - p1;
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jd.length = d.Length();
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m_joints[1] = m_world->CreateJoint(&jd);
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jd.bodyA = ground;
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jd.bodyB = m_bodies[2];
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jd.localAnchorA.Set(10.0f, 20.0f);
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jd.localAnchorB.Set(0.5f, 0.5f);
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p1 = jd.bodyA->GetWorldPoint(jd.localAnchorA);
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p2 = jd.bodyB->GetWorldPoint(jd.localAnchorB);
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d = p2 - p1;
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jd.length = d.Length();
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m_joints[2] = m_world->CreateJoint(&jd);
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jd.bodyA = ground;
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jd.bodyB = m_bodies[3];
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jd.localAnchorA.Set(-10.0f, 20.0f);
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jd.localAnchorB.Set(-0.5f, 0.5f);
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p1 = jd.bodyA->GetWorldPoint(jd.localAnchorA);
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p2 = jd.bodyB->GetWorldPoint(jd.localAnchorB);
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d = p2 - p1;
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jd.length = d.Length();
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m_joints[3] = m_world->CreateJoint(&jd);
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jd.bodyA = m_bodies[0];
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jd.bodyB = m_bodies[1];
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jd.localAnchorA.Set(0.5f, 0.0f);
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jd.localAnchorB.Set(-0.5f, 0.0f);;
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p1 = jd.bodyA->GetWorldPoint(jd.localAnchorA);
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p2 = jd.bodyB->GetWorldPoint(jd.localAnchorB);
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d = p2 - p1;
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jd.length = d.Length();
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m_joints[4] = m_world->CreateJoint(&jd);
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jd.bodyA = m_bodies[1];
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jd.bodyB = m_bodies[2];
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jd.localAnchorA.Set(0.0f, 0.5f);
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jd.localAnchorB.Set(0.0f, -0.5f);
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p1 = jd.bodyA->GetWorldPoint(jd.localAnchorA);
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p2 = jd.bodyB->GetWorldPoint(jd.localAnchorB);
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d = p2 - p1;
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jd.length = d.Length();
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m_joints[5] = m_world->CreateJoint(&jd);
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jd.bodyA = m_bodies[2];
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jd.bodyB = m_bodies[3];
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jd.localAnchorA.Set(-0.5f, 0.0f);
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jd.localAnchorB.Set(0.5f, 0.0f);
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p1 = jd.bodyA->GetWorldPoint(jd.localAnchorA);
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p2 = jd.bodyB->GetWorldPoint(jd.localAnchorB);
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d = p2 - p1;
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jd.length = d.Length();
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m_joints[6] = m_world->CreateJoint(&jd);
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jd.bodyA = m_bodies[3];
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jd.bodyB = m_bodies[0];
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jd.localAnchorA.Set(0.0f, -0.5f);
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jd.localAnchorB.Set(0.0f, 0.5f);
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p1 = jd.bodyA->GetWorldPoint(jd.localAnchorA);
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p2 = jd.bodyB->GetWorldPoint(jd.localAnchorB);
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d = p2 - p1;
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jd.length = d.Length();
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m_joints[7] = m_world->CreateJoint(&jd);
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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 'b':
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for (int32 i = 0; i < 4; ++i)
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{
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if (m_bodies[i])
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{
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m_world->DestroyBody(m_bodies[i]);
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m_bodies[i] = NULL;
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break;
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}
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}
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break;
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case 'j':
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for (int32 i = 0; i < 8; ++i)
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{
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if (m_joints[i])
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{
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m_world->DestroyJoint(m_joints[i]);
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m_joints[i] = NULL;
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break;
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}
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}
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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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m_debugDraw.DrawString(5, m_textLine, "This demonstrates a soft distance joint.");
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m_textLine += 15;
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m_debugDraw.DrawString(5, m_textLine, "Press: (b) to delete a body, (j) to delete a joint");
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m_textLine += 15;
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}
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void JointDestroyed(b2Joint* joint)
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{
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for (int32 i = 0; i < 8; ++i)
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{
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if (m_joints[i] == joint)
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{
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m_joints[i] = NULL;
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break;
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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 Web;
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}
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b2Body* m_bodies[4];
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b2Joint* m_joints[8];
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};
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#endif
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