Add initial prototype.
This commit is contained in:
Rod Kay
218
3-mid/physics/implement/box2d/contrib/testbed/tests/web.cpp
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218
3-mid/physics/implement/box2d/contrib/testbed/tests/web.cpp
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// MIT License
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// Copyright (c) 2019 Erin Catto
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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#include "test.h"
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// Test 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.SetTwoSided(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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float frequencyHz = 2.0f;
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float 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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b2LinearStiffness(jd.stiffness, jd.damping, frequencyHz, dampingRatio, jd.bodyA, jd.bodyB);
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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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b2LinearStiffness(jd.stiffness, jd.damping, frequencyHz, dampingRatio, jd.bodyA, jd.bodyB);
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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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b2LinearStiffness(jd.stiffness, jd.damping, frequencyHz, dampingRatio, jd.bodyA, jd.bodyB);
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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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b2LinearStiffness(jd.stiffness, jd.damping, frequencyHz, dampingRatio, jd.bodyA, jd.bodyB);
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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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b2LinearStiffness(jd.stiffness, jd.damping, frequencyHz, dampingRatio, jd.bodyA, jd.bodyB);
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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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b2LinearStiffness(jd.stiffness, jd.damping, frequencyHz, dampingRatio, jd.bodyA, jd.bodyB);
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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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b2LinearStiffness(jd.stiffness, jd.damping, frequencyHz, dampingRatio, jd.bodyA, jd.bodyB);
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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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b2LinearStiffness(jd.stiffness, jd.damping, frequencyHz, dampingRatio, jd.bodyA, jd.bodyB);
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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(int key) override
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{
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switch (key)
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{
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case GLFW_KEY_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 GLFW_KEY_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) override
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{
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Test::Step(settings);
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g_debugDraw.DrawString(5, m_textLine, "Press: (b) to delete a body, (j) to delete a joint");
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m_textLine += m_textIncrement;
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}
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void JointDestroyed(b2Joint* joint) override
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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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static int testIndex = RegisterTest("Examples", "Web", Web::Create);
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