shape_editing.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 ShapeEditing : public Test
{
public:

        ShapeEditing()
        {
                {
                        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);
                }

                b2BodyDef bd;
                bd.type = b2_dynamicBody;
                bd.position.Set(0.0f, 10.0f);
                m_body = m_world->CreateBody(&bd);

                b2PolygonShape shape;
                shape.SetAsBox(4.0f, 4.0f, b2Vec2(0.0f, 0.0f), 0.0f);
                m_fixture1 = m_body->CreateFixture(&shape, 10.0f);

                m_fixture2 = NULL;

                m_sensor = false;
        }

        void Keyboard(int key) override
        {
                switch (key)
                {
                case GLFW_KEY_C:
                        if (m_fixture2 == NULL)
                        {
                                b2CircleShape shape;
                                shape.m_radius = 3.0f;
                                shape.m_p.Set(0.5f, -4.0f);
                                m_fixture2 = m_body->CreateFixture(&shape, 10.0f);
                                m_body->SetAwake(true);
                        }
                        break;

                case GLFW_KEY_D:
                        if (m_fixture2 != NULL)
                        {
                                m_body->DestroyFixture(m_fixture2);
                                m_fixture2 = NULL;
                                m_body->SetAwake(true);
                        }
                        break;

                case GLFW_KEY_S:
                        if (m_fixture2 != NULL)
                        {
                                m_sensor = !m_sensor;
                                m_fixture2->SetSensor(m_sensor);
                        }
                        break;
                }
        }

        void Step(Settings& settings) override
        {
                Test::Step(settings);
                g_debugDraw.DrawString(5, m_textLine, "Press: (c) create a shape, (d) destroy a shape.");
                m_textLine += m_textIncrement;
                g_debugDraw.DrawString(5, m_textLine, "sensor = %d", m_sensor);
                m_textLine += m_textIncrement;
        }

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

        b2Body* m_body;
        b2Fixture* m_fixture1;
        b2Fixture* m_fixture2;
        bool m_sensor;
};

static int testIndex = RegisterTest("Examples", "Shape Editing", ShapeEditing::Create);