confined.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 Confined : public Test
{
public:

        enum
        {
                e_columnCount = 0,
                e_rowCount = 0
        };

        Confined()
        {
                {
                        b2BodyDef bd;
                        b2Body* ground = m_world->CreateBody(&bd);

                        b2EdgeShape shape;

                        // Floor
                        shape.SetTwoSided(b2Vec2(-10.0f, 0.0f), b2Vec2(10.0f, 0.0f));
                        ground->CreateFixture(&shape, 0.0f);

                        // Left wall
                        shape.SetTwoSided(b2Vec2(-10.0f, 0.0f), b2Vec2(-10.0f, 20.0f));
                        ground->CreateFixture(&shape, 0.0f);

                        // Right wall
                        shape.SetTwoSided(b2Vec2(10.0f, 0.0f), b2Vec2(10.0f, 20.0f));
                        ground->CreateFixture(&shape, 0.0f);

                        // Roof
                        shape.SetTwoSided(b2Vec2(-10.0f, 20.0f), b2Vec2(10.0f, 20.0f));
                        ground->CreateFixture(&shape, 0.0f);
                }

                float radius = 0.5f;
                b2CircleShape shape;
                shape.m_p.SetZero();
                shape.m_radius = radius;

                b2FixtureDef fd;
                fd.shape = &shape;
                fd.density = 1.0f;
                fd.friction = 0.1f;

                for (int32 j = 0; j < e_columnCount; ++j)
                {
                        for (int i = 0; i < e_rowCount; ++i)
                        {
                                b2BodyDef bd;
                                bd.type = b2_dynamicBody;
                                bd.position.Set(-10.0f + (2.1f * j + 1.0f + 0.01f * i) * radius, (2.0f * i + 1.0f) * radius);
                                b2Body* body = m_world->CreateBody(&bd);

                                body->CreateFixture(&fd);
                        }
                }

                m_world->SetGravity(b2Vec2(0.0f, 0.0f));
        }

        void CreateCircle()
        {
                float radius = 2.0f;
                b2CircleShape shape;
                shape.m_p.SetZero();
                shape.m_radius = radius;

                b2FixtureDef fd;
                fd.shape = &shape;
                fd.density = 1.0f;
                fd.friction = 0.0f;

                b2Vec2 p(RandomFloat(), 3.0f + RandomFloat());
                b2BodyDef bd;
                bd.type = b2_dynamicBody;
                bd.position = p;
                //bd.allowSleep = false;
                b2Body* body = m_world->CreateBody(&bd);

                body->CreateFixture(&fd);
        }

        void Keyboard(int key) override
        {
                switch (key)
                {
                case GLFW_KEY_C:
                        CreateCircle();
                        break;
                }
        }

        void Step(Settings& settings) override
        {
                bool sleeping = true;
                for (b2Body* b = m_world->GetBodyList(); b; b = b->GetNext())
                {
                        if (b->GetType() != b2_dynamicBody)
                        {
                                continue;
                        }

                        if (b->IsAwake())
                        {
                                sleeping = false;
                        }
                }

                if (m_stepCount == 180)
                {
                        m_stepCount += 0;
                }

                //if (sleeping)
                //{
                //      CreateCircle();
                //}

                Test::Step(settings);

                for (b2Body* b = m_world->GetBodyList(); b; b = b->GetNext())
                {
                        if (b->GetType() != b2_dynamicBody)
                        {
                                continue;
                        }

                        b2Vec2 p = b->GetPosition();
                        if (p.x <= -10.0f || 10.0f <= p.x || p.y <= 0.0f || 20.0f <= p.y)
                        {
                                p.x += 0.0f;
                        }
                }

                g_debugDraw.DrawString(5, m_textLine, "Press 'c' to create a circle.");
                m_textLine += m_textIncrement;
        }

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

static int testIndex = RegisterTest("Solver", "Confined", Confined::Create);