box_stack.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"

extern B2_API bool g_blockSolve;

class BoxStack : public Test
{
public:

        enum
        {
                e_columnCount = 1,
                e_rowCount = 15
                //e_columnCount = 1,
                //e_rowCount = 1
        };

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

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

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

                float xs[5] = {0.0f, -10.0f, -5.0f, 5.0f, 10.0f};

                for (int32 j = 0; j < e_columnCount; ++j)
                {
                        b2PolygonShape shape;
                        shape.SetAsBox(0.5f, 0.5f);

                        b2FixtureDef fd;
                        fd.shape = &shape;
                        fd.density = 1.0f;
                        fd.friction = 0.3f;

                        for (int i = 0; i < e_rowCount; ++i)
                        {
                                b2BodyDef bd;
                                bd.type = b2_dynamicBody;

                                int32 n = j * e_rowCount + i;
                                b2Assert(n < e_rowCount * e_columnCount);
                                m_indices[n] = n;
                                bd.userData.pointer = n;

                                float x = 0.0f;
                                //float x = RandomFloat(-0.02f, 0.02f);
                                //float x = i % 2 == 0 ? -0.01f : 0.01f;
                                bd.position.Set(xs[j] + x, 0.55f + 1.1f * i);
                                b2Body* body = m_world->CreateBody(&bd);

                                m_bodies[n] = body;

                                body->CreateFixture(&fd);
                        }
                }

                m_bullet = NULL;
        }

        void Keyboard(int key) override
        {
                switch (key)
                {
                case GLFW_KEY_COMMA:
                        if (m_bullet != NULL)
                        {
                                m_world->DestroyBody(m_bullet);
                                m_bullet = NULL;
                        }

                        {
                                b2CircleShape shape;
                                shape.m_radius = 0.25f;

                                b2FixtureDef fd;
                                fd.shape = &shape;
                                fd.density = 20.0f;
                                fd.restitution = 0.05f;

                                b2BodyDef bd;
                                bd.type = b2_dynamicBody;
                                bd.bullet = true;
                                bd.position.Set(-31.0f, 5.0f);

                                m_bullet = m_world->CreateBody(&bd);
                                m_bullet->CreateFixture(&fd);

                                m_bullet->SetLinearVelocity(b2Vec2(400.0f, 0.0f));
                        }
                        break;
                
        case GLFW_KEY_B:
            g_blockSolve = !g_blockSolve;
            break;
                }
        }

        void Step(Settings& settings) override
        {
                Test::Step(settings);
                g_debugDraw.DrawString(5, m_textLine, "Press: (,) to launch a bullet.");
                m_textLine += m_textIncrement;
                g_debugDraw.DrawString(5, m_textLine, "Blocksolve = %d", g_blockSolve);
                //if (m_stepCount == 300)
                //{
                //      if (m_bullet != NULL)
                //      {
                //              m_world->DestroyBody(m_bullet);
                //              m_bullet = NULL;
                //      }

                //      {
                //              b2CircleShape shape;
                //              shape.m_radius = 0.25f;

                //              b2FixtureDef fd;
                //              fd.shape = &shape;
                //              fd.density = 20.0f;
                //              fd.restitution = 0.05f;

                //              b2BodyDef bd;
                //              bd.type = b2_dynamicBody;
                //              bd.bullet = true;
                //              bd.position.Set(-31.0f, 5.0f);

                //              m_bullet = m_world->CreateBody(&bd);
                //              m_bullet->CreateFixture(&fd);

                //              m_bullet->SetLinearVelocity(b2Vec2(400.0f, 0.0f));
                //      }
                //}
        }

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

        b2Body* m_bullet;
        b2Body* m_bodies[e_rowCount * e_columnCount];
        int32 m_indices[e_rowCount * e_columnCount];
};

static int testIndex = RegisterTest("Stacking", "Boxes", BoxStack::Create);