chain.cpp

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// MIT License

// Copyright (c) 2019 Erin Catto

// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:

// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

#include "test.h"

#define TEST_BAD_BODY 0

class Chain : public Test
{
public:
        Chain()
        {
                b2Body* ground = NULL;
                {
                        b2BodyDef bd;
                        ground = m_world->CreateBody(&bd);

                        b2EdgeShape shape;
                        shape.SetTwoSided(b2Vec2(-40.0f, 0.0f), b2Vec2(40.0f, 0.0f));
                        ground->CreateFixture(&shape, 0.0f);
                }

                {
                        b2PolygonShape shape;
                        shape.SetAsBox(0.6f, 0.125f);

                        b2FixtureDef fd;
                        fd.shape = &shape;
                        fd.density = 20.0f;
                        fd.friction = 0.2f;

                        b2RevoluteJointDef jd;
                        jd.collideConnected = false;

                        const float y = 25.0f;
                        b2Body* prevBody = ground;
                        for (int32 i = 0; i < 30; ++i)
                        {
                                b2BodyDef bd;
                                bd.type = b2_dynamicBody;
                                bd.position.Set(0.5f + i, y);
                                b2Body* body = m_world->CreateBody(&bd);

#if TEST_BAD_BODY == 1
                                if (i == 10)
                                {
                                        // Test zero density dynamic body
                                        fd.density = 0.0f;
                                }
                                else
                                {
                                        fd.density = 20.0f;
                                }
#endif

                                body->CreateFixture(&fd);

                                b2Vec2 anchor(float(i), y);
                                jd.Initialize(prevBody, body, anchor);
                                m_world->CreateJoint(&jd);

                                prevBody = body;
                        }
                }
        }

        static Test* Create()
        {
                return new Chain;
        }
};

static int testIndex = RegisterTest("Joints", "Chain", Chain::Create);