dump_loader.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"

// This test holds worlds dumped using b2World::Dump.
class DumpLoader : public Test
{
public:

        DumpLoader()
        {
                b2ChainShape chainShape;
                b2Vec2 vertices[] = {b2Vec2(-5,0), b2Vec2(5,0), b2Vec2(5,5), b2Vec2(4,1), b2Vec2(-4,1), b2Vec2(-5,5)};
                chainShape.CreateLoop(vertices, 6);

                b2FixtureDef groundFixtureDef;
                groundFixtureDef.density = 0;
                groundFixtureDef.shape = &chainShape;

                b2BodyDef groundBodyDef;
                groundBodyDef.type = b2_staticBody;

                b2Body *groundBody = m_world->CreateBody(&groundBodyDef);
                b2Fixture *groundBodyFixture = groundBody->CreateFixture(&groundFixtureDef);

                b2CircleShape ballShape;
                ballShape.m_radius = 1;

                b2FixtureDef ballFixtureDef;
                ballFixtureDef.restitution = 0.75f;
                ballFixtureDef.density = 1;
                ballFixtureDef.shape = &ballShape;

                b2BodyDef ballBodyDef;
                ballBodyDef.type = b2BodyType::b2_dynamicBody;
                ballBodyDef.position = b2Vec2(0, 10);
                // ballBodyDef.angularDamping = 0.2f;

                m_ball = m_world->CreateBody(&ballBodyDef);
                b2Fixture *ballFixture = m_ball->CreateFixture(&ballFixtureDef);
                m_ball->ApplyForceToCenter(b2Vec2(-1000, -400), true);
        }

        void Step(Settings& settings) override
        {
                b2Vec2 v = m_ball->GetLinearVelocity();
                float omega = m_ball->GetAngularVelocity();

                b2MassData massData;
                m_ball->GetMassData(&massData);

                float ke = 0.5f * massData.mass * b2Dot(v, v) + 0.5f * massData.I * omega * omega;

                g_debugDraw.DrawString(5, m_textLine, "kinetic energy = %.6f", ke);
                m_textLine += m_textIncrement;

                Test::Step(settings);
        }

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

        b2Body* m_ball;
};

static int testIndex = RegisterTest("Bugs", "Dump Loader", DumpLoader::Create);