axmol/tests/cpp-tests/Classes/Box2DTest/Box2dTest.cpp

/****************************************************************************
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.
 Copyright (c) 2021 @aismann; Peter Eismann, Germany; dreifrankensoft

 http://www.cocos2d-x.org

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#include "Box2dTest.h"
#include "../testResource.h"
#include "extensions/cocos-ext.h"
#include "renderer/CCRenderer.h"
#include "renderer/CCCustomCommand.h"



USING_NS_CC;
USING_NS_CC_EXT;

#define PTM_RATIO 32

#define DRAW_STRING_NEW_LINE 25

enum {
    kTagParentNode = 1,
};

Settingss settingss;

extern cocos2d::DrawNode* drawBox2D;
extern cocos2d::Vec2 debugNodeOffset;

Box2DTests::Box2DTests()
{
    ADD_TEST_CASE(Box2DTest);
}

bool Box2DTest::init()
{
    if (!TestCase::init())
    {
        return false;
    }
    auto dispatcher = Director::getInstance()->getEventDispatcher();

    auto touchListener = EventListenerTouchAllAtOnce::create();
    touchListener->onTouchesEnded = CC_CALLBACK_2(Box2DTest::onTouchesEnded, this);
    dispatcher->addEventListenerWithSceneGraphPriority(touchListener, this);

    // init physics
    this->initPhysics();
    // create reset button
    this->createResetButton();

    //Set up sprite
#if 1
    // Use batch node. Faster
    auto parent = SpriteBatchNode::create("Images/blocks.png", 100);
    _spriteTexture = parent->getTexture();
#else
    // doesn't use batch node. Slower
    _spriteTexture = Director::getInstance()->getTextureCache()->addImage("Images/blocks.png");
    auto parent = Node::create();
#endif
    addChild(parent, 0, kTagParentNode);


    addNewSpriteAtPosition(VisibleRect::center());

    auto label = Label::createWithTTF("Tap screen", "fonts/Marker Felt.ttf", 32.0f);
    addChild(label, 0);
    label->setColor(Color3B(0, 0, 255));
    label->setPosition(VisibleRect::center().x, VisibleRect::top().y - 50);

    // menu for debug layer
    MenuItemFont::setFontSize(18);
    auto item = MenuItemFont::create("Toggle debug", CC_CALLBACK_1(Box2DTest::toggleDebugCallback, this));

    auto menu = Menu::create(item, nullptr);
    this->addChild(menu);
    menu->setPosition(VisibleRect::right().x - 100, VisibleRect::top().y - 60);

    addChild(drawBox2D, 100);
    drawBox2D->setOpacity(150);

    scheduleUpdate();

    return true;
}

Box2DTest::Box2DTest()
    : _spriteTexture(nullptr)
    , world(nullptr)
{

}

Box2DTest::~Box2DTest()
{
    CC_SAFE_DELETE(world);
}


void Box2DTest::toggleDebugCallback(Ref* sender)
{
    static bool show = true;
    if (show)
    {
        world->SetDebugDraw(nullptr);
        show = 0;
    }
    else
    {
        world->SetDebugDraw(&g_debugDraw);
        show = true;
    }
}


void Box2DTest::initPhysics()
{
    b2Vec2 gravity;
    gravity.Set(0.0f, -10.0f);
    world = new b2World(gravity);

    // Do we want to let bodies sleep?
    world->SetAllowSleeping(true);

    world->SetContinuousPhysics(true);

 

    // Define the ground body.
    b2BodyDef groundBodyDef;
    groundBodyDef.position.Set(0, 0); // bottom-left corner

    // Call the body factory which allocates memory for the ground body
    // from a pool and creates the ground box shape (also from a pool).
    // The body is also added to the world.
    b2Body* groundBody = world->CreateBody(&groundBodyDef);

    // Define the ground box shape.
    b2EdgeShape groundBox;

    // bottom
    groundBox.SetTwoSided(b2Vec2(VisibleRect::leftBottom().x / PTM_RATIO, VisibleRect::leftBottom().y / PTM_RATIO), b2Vec2(VisibleRect::rightBottom().x / PTM_RATIO, VisibleRect::rightBottom().y / PTM_RATIO));
    groundBody->CreateFixture(&groundBox, 0);

    // top
    groundBox.SetTwoSided(b2Vec2(VisibleRect::leftTop().x / PTM_RATIO, VisibleRect::leftTop().y / PTM_RATIO), b2Vec2(VisibleRect::rightTop().x / PTM_RATIO, VisibleRect::rightTop().y / PTM_RATIO));
    groundBody->CreateFixture(&groundBox, 0);

    // left
    groundBox.SetTwoSided(b2Vec2(VisibleRect::leftTop().x / PTM_RATIO, VisibleRect::leftTop().y / PTM_RATIO), b2Vec2(VisibleRect::leftBottom().x / PTM_RATIO, VisibleRect::leftBottom().y / PTM_RATIO));
    groundBody->CreateFixture(&groundBox, 0);

    // right
    groundBox.SetTwoSided(b2Vec2(VisibleRect::rightBottom().x / PTM_RATIO, VisibleRect::rightBottom().y / PTM_RATIO), b2Vec2(VisibleRect::rightTop().x / PTM_RATIO, VisibleRect::rightTop().y / PTM_RATIO));
    groundBody->CreateFixture(&groundBox, 0);


    g_debugDraw.mRatio = 32;
    debugNodeOffset = { 0, 0 };
    world->SetDebugDraw(&g_debugDraw);

}

void Box2DTest::createResetButton()
{
    auto reset = MenuItemImage::create("Images/r1.png", "Images/r2.png", [&](Ref* sender) {
        getTestSuite()->restartCurrTest();
        });

    auto menu = Menu::create(reset, nullptr);

    menu->setPosition(VisibleRect::bottom().x, VisibleRect::bottom().y + 30);
    this->addChild(menu, -1);
}

void Box2DTest::draw(Renderer* renderer, const Mat4& transform, uint32_t flags)
{
    //
    // IMPORTANT:
    // This is only for debug purposes
    // It is recommend to disable it
    //
    Scene::draw(renderer, transform, flags);

    _customCmd.init(_globalZOrder, transform, flags);
    _customCmd.func = CC_CALLBACK_0(Box2DTest::onDraw, this, transform, flags);
    renderer->addCommand(&_customCmd);
}

void Box2DTest::onDraw(const Mat4& transform, uint32_t flags)
{
    drawBox2D->clear();
    Step(&settingss);
}


void Box2DTest::addNewSpriteAtPosition(Vec2 p)
{
    CCLOG("Add sprite %0.2f x %02.f", p.x, p.y);

    // Define the dynamic body.
    //Set up a 1m squared box in the physics world
    b2BodyDef bodyDef;
    bodyDef.type = b2_dynamicBody;
    bodyDef.position.Set(p.x / PTM_RATIO, p.y / PTM_RATIO);

    b2Body* body = world->CreateBody(&bodyDef);

    // Define another box shape for our dynamic body.
    b2PolygonShape dynamicBox;
    dynamicBox.SetAsBox(.5f, .5f);//These are mid points for our 1m box

    // Define the dynamic body fixture.
    b2FixtureDef fixtureDef;
    fixtureDef.shape = &dynamicBox;
    fixtureDef.density = 1.0f;
    fixtureDef.friction = 0.3f;
    body->CreateFixture(&fixtureDef);

    auto parent = this->getChildByTag(kTagParentNode);

    //We have a 64x64 sprite sheet with 4 different 32x32 images.  The following code is
    //just randomly picking one of the images
    int idx = (CCRANDOM_0_1() > .5 ? 0 : 1);
    int idy = (CCRANDOM_0_1() > .5 ? 0 : 1);
    auto sprite = PhysicsSpriteBox2D::createWithTexture(_spriteTexture, Rect(32 * idx, 32 * idy, 32, 32));
    parent->addChild(sprite);
    sprite->setB2Body(body);
    sprite->setPTMRatio(PTM_RATIO);
    sprite->setPosition(cocos2d::Vec2(p.x, p.y));
}

void Box2DTest::update(float dt)
{
    //It is recommended that a fixed time step is used with Box2D for stability
    //of the simulation, however, we are using a variable time step here.
    //You need to make an informed choice, the following URL is useful
    //http://gafferongames.com/game-physics/fix-your-timestep/

    int velocityIterations = 8;
    int positionIterations = 1;

    // Instruct the world to perform a single step of simulation. It is
    // generally best to keep the time step and iterations fixed.
    world->Step(dt, velocityIterations, positionIterations);
//    world->DebugDraw();
}

void Box2DTest::onTouchesEnded(const std::vector<Touch*>& touches, Event* event)
{
    //Add a new body/atlas sprite at the touched location

    for (auto& touch : touches)
    {
        if (!touch)
            break;

        auto location = touch->getLocation();

        addNewSpriteAtPosition(location);
    }
}


void Box2DTest::Step(Settingss* settings)
{
    float timeStep = settings->hz > 0.0f ? 1.0f / settings->hz : float(0.0f);

    if (settings->pause)
    {
        if (settings->singleStep)
        {
            settings->singleStep = 0;
        }
        else
        {
            timeStep = 0.0f;
        }

        g_debugDraw.DrawString(5, m_textLine, "****PAUSED****");
        m_textLine += DRAW_STRING_NEW_LINE;
    }

    uint32 flags = 0;
    flags += settings->drawShapes * b2Draw::e_shapeBit;
    flags += settings->drawJoints * b2Draw::e_jointBit;
    flags += settings->drawAABBs * b2Draw::e_aabbBit;
    flags += settings->drawCOMs * b2Draw::e_centerOfMassBit;
    g_debugDraw.SetFlags(flags);

    world->SetAllowSleeping(settings->enableSleep > 0);
    world->SetWarmStarting(settings->enableWarmStarting > 0);
    world->SetContinuousPhysics(settings->enableContinuous > 0);
    world->SetSubStepping(settings->enableSubStepping > 0);

    m_pointCount = 0;

    world->Step(timeStep, settings->velocityIterations, settings->positionIterations);

    world->DebugDraw();

    if (timeStep > 0.0f)
    {
        ++m_stepCount;
    }

    if (settings->drawStats)
    {
        int32 bodyCount = world->GetBodyCount();
        int32 contactCount = world->GetContactCount();
        int32 jointCount = world->GetJointCount();
        g_debugDraw.DrawString(5, m_textLine, "bodies/contacts/joints = %d/%d/%d", bodyCount, contactCount, jointCount);
        m_textLine += DRAW_STRING_NEW_LINE;

        int32 proxyCount = world->GetProxyCount();
        int32 height = world->GetTreeHeight();
        int32 balance = world->GetTreeBalance();
        float quality = world->GetTreeQuality();
        g_debugDraw.DrawString(5, m_textLine, "proxies/height/balance/quality = %d/%d/%d/%g", proxyCount, height, balance, quality);
        m_textLine += DRAW_STRING_NEW_LINE;
    }

    // Track maximum profile times
    {
        const b2Profile& p = world->GetProfile();
        m_maxProfile.step = b2Max(m_maxProfile.step, p.step);
        m_maxProfile.collide = b2Max(m_maxProfile.collide, p.collide);
        m_maxProfile.solve = b2Max(m_maxProfile.solve, p.solve);
        m_maxProfile.solveInit = b2Max(m_maxProfile.solveInit, p.solveInit);
        m_maxProfile.solveVelocity = b2Max(m_maxProfile.solveVelocity, p.solveVelocity);
        m_maxProfile.solvePosition = b2Max(m_maxProfile.solvePosition, p.solvePosition);
        m_maxProfile.solveTOI = b2Max(m_maxProfile.solveTOI, p.solveTOI);
        m_maxProfile.broadphase = b2Max(m_maxProfile.broadphase, p.broadphase);

        m_totalProfile.step += p.step;
        m_totalProfile.collide += p.collide;
        m_totalProfile.solve += p.solve;
        m_totalProfile.solveInit += p.solveInit;
        m_totalProfile.solveVelocity += p.solveVelocity;
        m_totalProfile.solvePosition += p.solvePosition;
        m_totalProfile.solveTOI += p.solveTOI;
        m_totalProfile.broadphase += p.broadphase;
    }

    if (settings->drawProfile)
    {
        const b2Profile& p = world->GetProfile();

        b2Profile aveProfile;
        memset(&aveProfile, 0, sizeof(b2Profile));
        if (m_stepCount > 0)
        {
            float scale = 1.0f / m_stepCount;
            aveProfile.step = scale * m_totalProfile.step;
            aveProfile.collide = scale * m_totalProfile.collide;
            aveProfile.solve = scale * m_totalProfile.solve;
            aveProfile.solveInit = scale * m_totalProfile.solveInit;
            aveProfile.solveVelocity = scale * m_totalProfile.solveVelocity;
            aveProfile.solvePosition = scale * m_totalProfile.solvePosition;
            aveProfile.solveTOI = scale * m_totalProfile.solveTOI;
            aveProfile.broadphase = scale * m_totalProfile.broadphase;
        }

        g_debugDraw.DrawString(5, m_textLine, "step [ave] (max) = %5.2f [%6.2f] (%6.2f)", p.step, aveProfile.step, m_maxProfile.step);
        m_textLine += DRAW_STRING_NEW_LINE;
        g_debugDraw.DrawString(5, m_textLine, "collide [ave] (max) = %5.2f [%6.2f] (%6.2f)", p.collide, aveProfile.collide, m_maxProfile.collide);
        m_textLine += DRAW_STRING_NEW_LINE;
        g_debugDraw.DrawString(5, m_textLine, "solve [ave] (max) = %5.2f [%6.2f] (%6.2f)", p.solve, aveProfile.solve, m_maxProfile.solve);
        m_textLine += DRAW_STRING_NEW_LINE;
        g_debugDraw.DrawString(5, m_textLine, "solve init [ave] (max) = %5.2f [%6.2f] (%6.2f)", p.solveInit, aveProfile.solveInit, m_maxProfile.solveInit);
        m_textLine += DRAW_STRING_NEW_LINE;
        g_debugDraw.DrawString(5, m_textLine, "solve velocity [ave] (max) = %5.2f [%6.2f] (%6.2f)", p.solveVelocity, aveProfile.solveVelocity, m_maxProfile.solveVelocity);
        m_textLine += DRAW_STRING_NEW_LINE;
        g_debugDraw.DrawString(5, m_textLine, "solve position [ave] (max) = %5.2f [%6.2f] (%6.2f)", p.solvePosition, aveProfile.solvePosition, m_maxProfile.solvePosition);
        m_textLine += DRAW_STRING_NEW_LINE;
        g_debugDraw.DrawString(5, m_textLine, "solveTOI [ave] (max) = %5.2f [%6.2f] (%6.2f)", p.solveTOI, aveProfile.solveTOI, m_maxProfile.solveTOI);
        m_textLine += DRAW_STRING_NEW_LINE;
        g_debugDraw.DrawString(5, m_textLine, "broad-phase [ave] (max) = %5.2f [%6.2f] (%6.2f)", p.broadphase, aveProfile.broadphase, m_maxProfile.broadphase);
        m_textLine += DRAW_STRING_NEW_LINE;
    }

    //if (m_mouseJoint)
    //{
    //    b2Vec2 p1 = m_mouseJoint->GetAnchorB();
    //    b2Vec2 p2 = m_mouseJoint->GetTarget();

    //    b2Color c;
    //    c.Set(0.0f, 1.0f, 0.0f);
    //    g_debugDraw.DrawPoint(p1, 4.0f, c);
    //    g_debugDraw.DrawPoint(p2, 4.0f, c);

    //    c.Set(0.8f, 0.8f, 0.8f);
    //    g_debugDraw.DrawSegment(p1, p2, c);
    //}

    if (m_bombSpawning)
    {
        b2Color c;
        c.Set(0.0f, 0.0f, 1.0f);
        g_debugDraw.DrawPoint(m_bombSpawnPoint, 4.0f, c);

        c.Set(0.8f, 0.8f, 0.8f);
        g_debugDraw.DrawSegment(m_mouseWorld, m_bombSpawnPoint, c);
    }

    if (settings->drawContactPoints)
    {
        const float k_impulseScale = 0.1f;
        const float k_axisScale = 0.3f;

        for (int32 i = 0; i < m_pointCount; ++i)
        {
            ContactPoint* point = m_points + i;

            if (point->state == b2_addState)
            {
                // Add
                g_debugDraw.DrawPoint(point->position, 10.0f, b2Color(0.3f, 0.95f, 0.3f));
            }
            else if (point->state == b2_persistState)
            {
                // Persist
                g_debugDraw.DrawPoint(point->position, 5.0f, b2Color(0.3f, 0.3f, 0.95f));
            }

            if (settings->drawContactNormals == 1)
            {
                b2Vec2 p1 = point->position;
                b2Vec2 p2 = p1 + k_axisScale * point->normal;
                g_debugDraw.DrawSegment(p1, p2, b2Color(0.9f, 0.9f, 0.9f));
            }
            else if (settings->drawContactImpulse == 1)
            {
                b2Vec2 p1 = point->position;
                b2Vec2 p2 = p1 + k_impulseScale * point->normalImpulse * point->normal;
                g_debugDraw.DrawSegment(p1, p2, b2Color(0.9f, 0.9f, 0.3f));
            }

            if (settings->drawFrictionImpulse == 1)
            {
                b2Vec2 tangent = b2Cross(point->normal, 1.0f);
                b2Vec2 p1 = point->position;
                b2Vec2 p2 = p1 + k_impulseScale * point->tangentImpulse * tangent;
                g_debugDraw.DrawSegment(p1, p2, b2Color(0.9f, 0.9f, 0.3f));
            }
        }
    }
}