axmol/tests/cpp-tests/Source/Box2DTestBed/tests/web.cpp

// 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"

// Test distance joints, body destruction, and joint destruction.
class Web : public Test
{
public:
    Web()
    {
        b2Body* ground = NULL;
        {
            b2BodyDef bd;
            ground = m_world->CreateBody(&bd);

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

        {
            b2PolygonShape shape;
            shape.SetAsBox(0.5f, 0.5f);

            b2BodyDef bd;
            bd.type = b2_dynamicBody;

            bd.position.Set(-5.0f, 5.0f);
            m_bodies[0] = m_world->CreateBody(&bd);
            m_bodies[0]->CreateFixture(&shape, 5.0f);

            bd.position.Set(5.0f, 5.0f);
            m_bodies[1] = m_world->CreateBody(&bd);
            m_bodies[1]->CreateFixture(&shape, 5.0f);

            bd.position.Set(5.0f, 15.0f);
            m_bodies[2] = m_world->CreateBody(&bd);
            m_bodies[2]->CreateFixture(&shape, 5.0f);

            bd.position.Set(-5.0f, 15.0f);
            m_bodies[3] = m_world->CreateBody(&bd);
            m_bodies[3]->CreateFixture(&shape, 5.0f);

            b2DistanceJointDef jd;
            b2Vec2 p1, p2, d;

            float frequencyHz  = 2.0f;
            float dampingRatio = 0.0f;

            jd.bodyA = ground;
            jd.bodyB = m_bodies[0];
            jd.localAnchorA.Set(-10.0f, 0.0f);
            jd.localAnchorB.Set(-0.5f, -0.5f);
            p1        = jd.bodyA->GetWorldPoint(jd.localAnchorA);
            p2        = jd.bodyB->GetWorldPoint(jd.localAnchorB);
            d         = p2 - p1;
            jd.length = d.Length();
            b2LinearStiffness(jd.stiffness, jd.damping, frequencyHz, dampingRatio, jd.bodyA, jd.bodyB);
            m_joints[0] = m_world->CreateJoint(&jd);

            jd.bodyA = ground;
            jd.bodyB = m_bodies[1];
            jd.localAnchorA.Set(10.0f, 0.0f);
            jd.localAnchorB.Set(0.5f, -0.5f);
            p1        = jd.bodyA->GetWorldPoint(jd.localAnchorA);
            p2        = jd.bodyB->GetWorldPoint(jd.localAnchorB);
            d         = p2 - p1;
            jd.length = d.Length();
            b2LinearStiffness(jd.stiffness, jd.damping, frequencyHz, dampingRatio, jd.bodyA, jd.bodyB);
            m_joints[1] = m_world->CreateJoint(&jd);

            jd.bodyA = ground;
            jd.bodyB = m_bodies[2];
            jd.localAnchorA.Set(10.0f, 20.0f);
            jd.localAnchorB.Set(0.5f, 0.5f);
            p1        = jd.bodyA->GetWorldPoint(jd.localAnchorA);
            p2        = jd.bodyB->GetWorldPoint(jd.localAnchorB);
            d         = p2 - p1;
            jd.length = d.Length();
            b2LinearStiffness(jd.stiffness, jd.damping, frequencyHz, dampingRatio, jd.bodyA, jd.bodyB);
            m_joints[2] = m_world->CreateJoint(&jd);

            jd.bodyA = ground;
            jd.bodyB = m_bodies[3];
            jd.localAnchorA.Set(-10.0f, 20.0f);
            jd.localAnchorB.Set(-0.5f, 0.5f);
            p1        = jd.bodyA->GetWorldPoint(jd.localAnchorA);
            p2        = jd.bodyB->GetWorldPoint(jd.localAnchorB);
            d         = p2 - p1;
            jd.length = d.Length();
            b2LinearStiffness(jd.stiffness, jd.damping, frequencyHz, dampingRatio, jd.bodyA, jd.bodyB);
            m_joints[3] = m_world->CreateJoint(&jd);

            jd.bodyA = m_bodies[0];
            jd.bodyB = m_bodies[1];
            jd.localAnchorA.Set(0.5f, 0.0f);
            jd.localAnchorB.Set(-0.5f, 0.0f);
            ;
            p1        = jd.bodyA->GetWorldPoint(jd.localAnchorA);
            p2        = jd.bodyB->GetWorldPoint(jd.localAnchorB);
            d         = p2 - p1;
            jd.length = d.Length();
            b2LinearStiffness(jd.stiffness, jd.damping, frequencyHz, dampingRatio, jd.bodyA, jd.bodyB);
            m_joints[4] = m_world->CreateJoint(&jd);

            jd.bodyA = m_bodies[1];
            jd.bodyB = m_bodies[2];
            jd.localAnchorA.Set(0.0f, 0.5f);
            jd.localAnchorB.Set(0.0f, -0.5f);
            p1        = jd.bodyA->GetWorldPoint(jd.localAnchorA);
            p2        = jd.bodyB->GetWorldPoint(jd.localAnchorB);
            d         = p2 - p1;
            jd.length = d.Length();
            b2LinearStiffness(jd.stiffness, jd.damping, frequencyHz, dampingRatio, jd.bodyA, jd.bodyB);
            m_joints[5] = m_world->CreateJoint(&jd);

            jd.bodyA = m_bodies[2];
            jd.bodyB = m_bodies[3];
            jd.localAnchorA.Set(-0.5f, 0.0f);
            jd.localAnchorB.Set(0.5f, 0.0f);
            p1        = jd.bodyA->GetWorldPoint(jd.localAnchorA);
            p2        = jd.bodyB->GetWorldPoint(jd.localAnchorB);
            d         = p2 - p1;
            jd.length = d.Length();
            b2LinearStiffness(jd.stiffness, jd.damping, frequencyHz, dampingRatio, jd.bodyA, jd.bodyB);
            m_joints[6] = m_world->CreateJoint(&jd);

            jd.bodyA = m_bodies[3];
            jd.bodyB = m_bodies[0];
            jd.localAnchorA.Set(0.0f, -0.5f);
            jd.localAnchorB.Set(0.0f, 0.5f);
            p1        = jd.bodyA->GetWorldPoint(jd.localAnchorA);
            p2        = jd.bodyB->GetWorldPoint(jd.localAnchorB);
            d         = p2 - p1;
            jd.length = d.Length();
            b2LinearStiffness(jd.stiffness, jd.damping, frequencyHz, dampingRatio, jd.bodyA, jd.bodyB);
            m_joints[7] = m_world->CreateJoint(&jd);
        }
    }

    void Keyboard(int key) override
    {
        switch (key)
        {
        case GLFW_KEY_B:
            for (int32 i = 0; i < 4; ++i)
            {
                if (m_bodies[i])
                {
                    m_world->DestroyBody(m_bodies[i]);
                    m_bodies[i] = NULL;
                    break;
                }
            }
            break;

        case GLFW_KEY_J:
            for (int32 i = 0; i < 8; ++i)
            {
                if (m_joints[i])
                {
                    m_world->DestroyJoint(m_joints[i]);
                    m_joints[i] = NULL;
                    break;
                }
            }
            break;
        }
    }

    void Step(Settings& settings) override
    {
        Test::Step(settings);
        DrawString(5, m_textLine, "Press: (b) to delete a body, (j) to delete a joint");
    }

    void JointDestroyed(b2Joint* joint) override
    {
        for (int32 i = 0; i < 8; ++i)
        {
            if (m_joints[i] == joint)
            {
                m_joints[i] = NULL;
                break;
            }
        }
    }

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

    b2Body* m_bodies[4];
    b2Joint* m_joints[8];
};

static int testIndex = RegisterTest("Examples", "Web", Web::Create);