dominos.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"
 
class Dominos : public Test
{
public:
 
        Dominos()
        {
                b2Body* b1;
                {
                        b2EdgeShape shape;
                        shape.SetTwoSided(b2Vec2(-40.0f, 0.0f), b2Vec2(40.0f, 0.0f));
 
                        b2BodyDef bd;
                        b1 = m_world->CreateBody(&bd);
                        b1->CreateFixture(&shape, 0.0f);
                }
 
                {
                        b2PolygonShape shape;
                        shape.SetAsBox(6.0f, 0.25f);
 
                        b2BodyDef bd;
                        bd.position.Set(-1.5f, 10.0f);
                        b2Body* ground = m_world->CreateBody(&bd);
                        ground->CreateFixture(&shape, 0.0f);
                }
 
                {
                        b2PolygonShape shape;
                        shape.SetAsBox(0.1f, 1.0f);
 
                        b2FixtureDef fd;
                        fd.shape = &shape;
                        fd.density = 20.0f;
                        fd.friction = 0.1f;
 
                        for (int i = 0; i < 10; ++i)
                        {
                                b2BodyDef bd;
                                bd.type = b2_dynamicBody;
                                bd.position.Set(-6.0f + 1.0f * i, 11.25f);
                                b2Body* body = m_world->CreateBody(&bd);
                                body->CreateFixture(&fd);
                        }
                }
 
                {
                        b2PolygonShape shape;
                        shape.SetAsBox(7.0f, 0.25f, b2Vec2_zero, 0.3f);
 
                        b2BodyDef bd;
                        bd.position.Set(1.0f, 6.0f);
                        b2Body* ground = m_world->CreateBody(&bd);
                        ground->CreateFixture(&shape, 0.0f);
                }
 
                b2Body* b2;
                {
                        b2PolygonShape shape;
                        shape.SetAsBox(0.25f, 1.5f);
 
                        b2BodyDef bd;
                        bd.position.Set(-7.0f, 4.0f);
                        b2 = m_world->CreateBody(&bd);
                        b2->CreateFixture(&shape, 0.0f);
                }
 
                b2Body* b3;
                {
                        b2PolygonShape shape;
                        shape.SetAsBox(6.0f, 0.125f);
 
                        b2BodyDef bd;
                        bd.type = b2_dynamicBody;
                        bd.position.Set(-0.9f, 1.0f);
                        bd.angle = -0.15f;
 
                        b3 = m_world->CreateBody(&bd);
                        b3->CreateFixture(&shape, 10.0f);
                }
 
                b2RevoluteJointDef jd;
                b2Vec2 anchor;
 
                anchor.Set(-2.0f, 1.0f);
                jd.Initialize(b1, b3, anchor);
                jd.collideConnected = true;
                m_world->CreateJoint(&jd);
 
                b2Body* b4;
                {
                        b2PolygonShape shape;
                        shape.SetAsBox(0.25f, 0.25f);
 
                        b2BodyDef bd;
                        bd.type = b2_dynamicBody;
                        bd.position.Set(-10.0f, 15.0f);
                        b4 = m_world->CreateBody(&bd);
                        b4->CreateFixture(&shape, 10.0f);
                }
 
                anchor.Set(-7.0f, 15.0f);
                jd.Initialize(b2, b4, anchor);
                m_world->CreateJoint(&jd);
 
                b2Body* b5;
                {
                        b2BodyDef bd;
                        bd.type = b2_dynamicBody;
                        bd.position.Set(6.5f, 3.0f);
                        b5 = m_world->CreateBody(&bd);
 
                        b2PolygonShape shape;
                        b2FixtureDef fd;
 
                        fd.shape = &shape;
                        fd.density = 10.0f;
                        fd.friction = 0.1f;
 
                        shape.SetAsBox(1.0f, 0.1f, b2Vec2(0.0f, -0.9f), 0.0f);
                        b5->CreateFixture(&fd);
 
                        shape.SetAsBox(0.1f, 1.0f, b2Vec2(-0.9f, 0.0f), 0.0f);
                        b5->CreateFixture(&fd);
 
                        shape.SetAsBox(0.1f, 1.0f, b2Vec2(0.9f, 0.0f), 0.0f);
                        b5->CreateFixture(&fd);
                }
 
                anchor.Set(6.0f, 2.0f);
                jd.Initialize(b1, b5, anchor);
                m_world->CreateJoint(&jd);
 
                b2Body* b6;
                {
                        b2PolygonShape shape;
                        shape.SetAsBox(1.0f, 0.1f);
 
                        b2BodyDef bd;
                        bd.type = b2_dynamicBody;
                        bd.position.Set(6.5f, 4.1f);
                        b6 = m_world->CreateBody(&bd);
                        b6->CreateFixture(&shape, 30.0f);
                }
 
                anchor.Set(7.5f, 4.0f);
                jd.Initialize(b5, b6, anchor);
                m_world->CreateJoint(&jd);
 
                b2Body* b7;
                {
                        b2PolygonShape shape;
                        shape.SetAsBox(0.1f, 1.0f);
 
                        b2BodyDef bd;
                        bd.type = b2_dynamicBody;
                        bd.position.Set(7.4f, 1.0f);
 
                        b7 = m_world->CreateBody(&bd);
                        b7->CreateFixture(&shape, 10.0f);
                }
 
                b2DistanceJointDef djd;
                djd.bodyA = b3;
                djd.bodyB = b7;
                djd.localAnchorA.Set(6.0f, 0.0f);
                djd.localAnchorB.Set(0.0f, -1.0f);
                b2Vec2 d = djd.bodyB->GetWorldPoint(djd.localAnchorB) - djd.bodyA->GetWorldPoint(djd.localAnchorA);
                djd.length = d.Length();
 
                b2LinearStiffness(djd.stiffness, djd.damping, 1.0f, 1.0f, djd.bodyA, djd.bodyB);
                m_world->CreateJoint(&djd);
 
                {
                        float radius = 0.2f;
 
                        b2CircleShape shape;
                        shape.m_radius = radius;
 
                        for (int32 i = 0; i < 4; ++i)
                        {
                                b2BodyDef bd;
                                bd.type = b2_dynamicBody;
                                bd.position.Set(5.9f + 2.0f * radius * i, 2.4f);
                                b2Body* body = m_world->CreateBody(&bd);
                                body->CreateFixture(&shape, 10.0f);
                        }
                }
        }
 
        static Test* Create()
        {
                return new Dominos;
        }
};
 
static int testIndex = RegisterTest("Examples", "Dominos", Dominos::Create);