Web.h
上传用户:gb3593
上传日期:2022-01-07
资源大小:3028k
文件大小:6k
- /*
- * Copyright (c) 2006-2009 Erin Catto http://www.gphysics.com
- *
- * This software is provided 'as-is', without any express or implied
- * warranty. In no event will the authors be held liable for any damages
- * arising from the use of this software.
- * Permission is granted to anyone to use this software for any purpose,
- * including commercial applications, and to alter it and redistribute it
- * freely, subject to the following restrictions:
- * 1. The origin of this software must not be misrepresented; you must not
- * claim that you wrote the original software. If you use this software
- * in a product, an acknowledgment in the product documentation would be
- * appreciated but is not required.
- * 2. Altered source versions must be plainly marked as such, and must not be
- * misrepresented as being the original software.
- * 3. This notice may not be removed or altered from any source distribution.
- */
- #ifndef WEB_H
- #define WEB_H
- // This tests distance joints, body destruction, and joint destruction.
- class Web : public Test
- {
- public:
- Web()
- {
- b2Body* ground = NULL;
- {
- b2BodyDef bd;
- ground = m_world->CreateBody(&bd);
- b2PolygonShape shape;
- shape.SetAsEdge(b2Vec2(-40.0f, 0.0f), b2Vec2(40.0f, 0.0f));
- ground->CreateFixture(&shape, 0.0f);
- }
- {
- b2PolygonShape shape;
- shape.SetAsBox(0.5f, 0.5f);
- b2BodyDef bd;
- bd.type = b2_dynamicBody;
- bd.position.Set(-5.0f, 5.0f);
- m_bodies[0] = m_world->CreateBody(&bd);
- m_bodies[0]->CreateFixture(&shape, 5.0f);
- bd.position.Set(5.0f, 5.0f);
- m_bodies[1] = m_world->CreateBody(&bd);
- m_bodies[1]->CreateFixture(&shape, 5.0f);
- bd.position.Set(5.0f, 15.0f);
- m_bodies[2] = m_world->CreateBody(&bd);
- m_bodies[2]->CreateFixture(&shape, 5.0f);
- bd.position.Set(-5.0f, 15.0f);
- m_bodies[3] = m_world->CreateBody(&bd);
- m_bodies[3]->CreateFixture(&shape, 5.0f);
- b2DistanceJointDef jd;
- b2Vec2 p1, p2, d;
- jd.frequencyHz = 4.0f;
- jd.dampingRatio = 0.5f;
- jd.bodyA = ground;
- jd.bodyB = m_bodies[0];
- jd.localAnchorA.Set(-10.0f, 0.0f);
- jd.localAnchorB.Set(-0.5f, -0.5f);
- p1 = jd.bodyA->GetWorldPoint(jd.localAnchorA);
- p2 = jd.bodyB->GetWorldPoint(jd.localAnchorB);
- d = p2 - p1;
- jd.length = d.Length();
- m_joints[0] = m_world->CreateJoint(&jd);
- jd.bodyA = ground;
- jd.bodyB = m_bodies[1];
- jd.localAnchorA.Set(10.0f, 0.0f);
- jd.localAnchorB.Set(0.5f, -0.5f);
- p1 = jd.bodyA->GetWorldPoint(jd.localAnchorA);
- p2 = jd.bodyB->GetWorldPoint(jd.localAnchorB);
- d = p2 - p1;
- jd.length = d.Length();
- m_joints[1] = m_world->CreateJoint(&jd);
- jd.bodyA = ground;
- jd.bodyB = m_bodies[2];
- jd.localAnchorA.Set(10.0f, 20.0f);
- jd.localAnchorB.Set(0.5f, 0.5f);
- p1 = jd.bodyA->GetWorldPoint(jd.localAnchorA);
- p2 = jd.bodyB->GetWorldPoint(jd.localAnchorB);
- d = p2 - p1;
- jd.length = d.Length();
- m_joints[2] = m_world->CreateJoint(&jd);
- jd.bodyA = ground;
- jd.bodyB = m_bodies[3];
- jd.localAnchorA.Set(-10.0f, 20.0f);
- jd.localAnchorB.Set(-0.5f, 0.5f);
- p1 = jd.bodyA->GetWorldPoint(jd.localAnchorA);
- p2 = jd.bodyB->GetWorldPoint(jd.localAnchorB);
- d = p2 - p1;
- jd.length = d.Length();
- m_joints[3] = m_world->CreateJoint(&jd);
- jd.bodyA = m_bodies[0];
- jd.bodyB = m_bodies[1];
- jd.localAnchorA.Set(0.5f, 0.0f);
- jd.localAnchorB.Set(-0.5f, 0.0f);;
- p1 = jd.bodyA->GetWorldPoint(jd.localAnchorA);
- p2 = jd.bodyB->GetWorldPoint(jd.localAnchorB);
- d = p2 - p1;
- jd.length = d.Length();
- m_joints[4] = m_world->CreateJoint(&jd);
- jd.bodyA = m_bodies[1];
- jd.bodyB = m_bodies[2];
- jd.localAnchorA.Set(0.0f, 0.5f);
- jd.localAnchorB.Set(0.0f, -0.5f);
- p1 = jd.bodyA->GetWorldPoint(jd.localAnchorA);
- p2 = jd.bodyB->GetWorldPoint(jd.localAnchorB);
- d = p2 - p1;
- jd.length = d.Length();
- m_joints[5] = m_world->CreateJoint(&jd);
- jd.bodyA = m_bodies[2];
- jd.bodyB = m_bodies[3];
- jd.localAnchorA.Set(-0.5f, 0.0f);
- jd.localAnchorB.Set(0.5f, 0.0f);
- p1 = jd.bodyA->GetWorldPoint(jd.localAnchorA);
- p2 = jd.bodyB->GetWorldPoint(jd.localAnchorB);
- d = p2 - p1;
- jd.length = d.Length();
- m_joints[6] = m_world->CreateJoint(&jd);
- jd.bodyA = m_bodies[3];
- jd.bodyB = m_bodies[0];
- jd.localAnchorA.Set(0.0f, -0.5f);
- jd.localAnchorB.Set(0.0f, 0.5f);
- p1 = jd.bodyA->GetWorldPoint(jd.localAnchorA);
- p2 = jd.bodyB->GetWorldPoint(jd.localAnchorB);
- d = p2 - p1;
- jd.length = d.Length();
- m_joints[7] = m_world->CreateJoint(&jd);
- }
- }
- void Keyboard(unsigned char key)
- {
- switch (key)
- {
- case 'b':
- for (int32 i = 0; i < 4; ++i)
- {
- if (m_bodies[i])
- {
- m_world->DestroyBody(m_bodies[i]);
- m_bodies[i] = NULL;
- break;
- }
- }
- break;
- case 'j':
- for (int32 i = 0; i < 8; ++i)
- {
- if (m_joints[i])
- {
- m_world->DestroyJoint(m_joints[i]);
- m_joints[i] = NULL;
- break;
- }
- }
- break;
- }
- }
- void Step(Settings* settings)
- {
- Test::Step(settings);
- m_debugDraw.DrawString(5, m_textLine, "This demonstrates a soft distance joint.");
- m_textLine += 15;
- m_debugDraw.DrawString(5, m_textLine, "Press: (b) to delete a body, (j) to delete a joint");
- m_textLine += 15;
- }
- void JointDestroyed(b2Joint* joint)
- {
- for (int32 i = 0; i < 8; ++i)
- {
- if (m_joints[i] == joint)
- {
- m_joints[i] = NULL;
- break;
- }
- }
- }
- static Test* Create()
- {
- return new Web;
- }
- b2Body* m_bodies[4];
- b2Joint* m_joints[8];
- };
- #endif