axmol/tests/cpp-tests/Classes/ChipmunkTest/ChipmunkTest.cpp

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 Copyright (c) 2021 @aismann; Peter Eismann, Germany; dreifrankensoft

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//
// Accelerometer + Chipmunk physics + multi touches example
// a cocos2d example
// https://axmolengine.github.io/
//

#include "chipmunk/chipmunk.h"

#include "ChipmunkTest.h"

USING_NS_AX;
USING_NS_AX_EXT;

enum
{
    kTagParentNode = 1,
};

enum
{
    Z_PHYSICS_DEBUG = 100,
};

// callback to remove Shapes from the Space

ChipmunkTest::ChipmunkTest()
{
    // enable events

    auto touchListener            = EventListenerTouchAllAtOnce::create();
    touchListener->onTouchesEnded = AX_CALLBACK_2(ChipmunkTest::onTouchesEnded, this);
    _eventDispatcher->addEventListenerWithSceneGraphPriority(touchListener, this);

    Device::setAccelerometerEnabled(true);
    auto accListener = EventListenerAcceleration::create(AX_CALLBACK_2(ChipmunkTest::onAcceleration, this));
    _eventDispatcher->addEventListenerWithSceneGraphPriority(accListener, this);

    // title
    auto label = Label::createWithTTF("Multi touch the screen", "fonts/Marker Felt.ttf", 36.0f);
    label->setPosition(VisibleRect::center().x, VisibleRect::top().y - 30);
    this->addChild(label, -1);

    // reset button
    createResetButton();

    // init physics

    physicsDebugNodeOffset = Vec2(0, 0);
    initPhysics();

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

    addNewSpriteAtPosition(ax::Vec2(200.0f, 200.0f));

    // menu for debug layer
    MenuItemFont::setFontSize(18);
    auto item = MenuItemFont::create("Toggle debug", AX_CALLBACK_1(ChipmunkTest::toggleDebugCallback, this));

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

    scheduleUpdate();
}

void ChipmunkTest::toggleDebugCallback(Ref* sender)
{
    _debugLayer->setVisible(!_debugLayer->isVisible());
}

ChipmunkTest::~ChipmunkTest()
{
    // manually Free rogue shapes
    for (int i = 0; i < 4; i++)
    {
        cpShapeFree(_walls[i]);
    }

#if AX_TARGET_PLATFORM == AX_PLATFORM_WIN32
    cpSpaceFree(_space);
#else
    cpHastySpaceFree(_space);
#endif

    Device::setAccelerometerEnabled(false);
}

void ChipmunkTest::initPhysics()
{

    // init chipmunk
    // cpInitChipmunk();

#if AX_TARGET_PLATFORM == AX_PLATFORM_WIN32
    _space = cpSpaceNew();
#else
    _space = cpHastySpaceNew();
    cpHastySpaceSetThreads(_space, 0);
#endif

    cpSpaceSetGravity(_space, cpv(0.0f, -100.0f));

    //
    // rogue shapes
    // We have to free them manually
    //
    // bottom
    _walls[0] =
        cpSegmentShapeNew(cpSpaceGetStaticBody(_space), cpv(VisibleRect::leftBottom().x, VisibleRect::leftBottom().y),
                          cpv(VisibleRect::rightBottom().x, VisibleRect::rightBottom().y), 0.0f);

    // top
    _walls[1] = cpSegmentShapeNew(cpSpaceGetStaticBody(_space), cpv(VisibleRect::leftTop().x, VisibleRect::leftTop().y),
                                  cpv(VisibleRect::rightTop().x, VisibleRect::rightTop().y), 0.0f);

    // left
    _walls[2] =
        cpSegmentShapeNew(cpSpaceGetStaticBody(_space), cpv(VisibleRect::leftBottom().x, VisibleRect::leftBottom().y),
                          cpv(VisibleRect::leftTop().x, VisibleRect::leftTop().y), 0.0f);

    // right
    _walls[3] =
        cpSegmentShapeNew(cpSpaceGetStaticBody(_space), cpv(VisibleRect::rightBottom().x, VisibleRect::rightBottom().y),
                          cpv(VisibleRect::rightTop().x, VisibleRect::rightTop().y), 0.0f);

    for (int i = 0; i < 4; i++)
    {

        cpShapeSetElasticity(_walls[i], 1.0f);
        cpShapeSetFriction(_walls[i], 1.0f);
        cpSpaceAddShape(_space, _walls[i]);
    }

    // Physics debug layer
    _debugLayer = PhysicsDebugNodeChipmunk2D::create(_space);
    this->addChild(_debugLayer, Z_PHYSICS_DEBUG);
}

void ChipmunkTest::update(float delta)
{
    // Should use a fixed size step based on the animation interval.
    int steps = 2;
    float dt  = Director::getInstance()->getAnimationInterval() / (float)steps;

    for (int i = 0; i < steps; i++)
    {

#if AX_TARGET_PLATFORM == AX_PLATFORM_WIN32
        cpSpaceStep(_space, dt);
#else
        cpHastySpaceStep(_space, dt);
#endif
    }
}

void ChipmunkTest::createResetButton()
{
    auto reset = MenuItemImage::create("Images/r1.png", "Images/r2.png", AX_CALLBACK_1(ChipmunkTest::reset, this));

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

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

void ChipmunkTest::reset(Ref* sender)
{
    getTestSuite()->restartCurrTest();
}

void ChipmunkTest::addNewSpriteAtPosition(ax::Vec2 pos)
{
    int posx, posy;

    auto parent = getChildByTag(kTagParentNode);

    posx = AXRANDOM_0_1() * 200.0f;
    posy = AXRANDOM_0_1() * 200.0f;

    posx = (posx % 4) * 85;
    posy = (posy % 3) * 121;

    int num        = 4;
    cpVect verts[] = {
        cpv(-24, -54),
        cpv(-24, 54),
        cpv(24, 54),
        cpv(24, -54),
    };

    cpBody* body = cpBodyNew(1.0f, cpMomentForPoly(1.0f, num, verts, cpvzero, 0.0f));

    cpBodySetPosition(body, cpv(pos.x, pos.y));
    cpSpaceAddBody(_space, body);

    cpShape* shape = cpPolyShapeNew(body, num, verts, cpTransformIdentity, 0.0f);
    cpShapeSetElasticity(shape, 0.5f);
    cpShapeSetFriction(shape, 0.5f);
    cpSpaceAddShape(_space, shape);

    auto sprite = PhysicsSpriteChipmunk2D::createWithTexture(_spriteTexture, ax::Rect(posx, posy, 85, 121));
    parent->addChild(sprite);

    sprite->setCPBody(body);
    sprite->setPosition(pos);
}

void ChipmunkTest::onEnter()
{
    TestCase::onEnter();
}

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

    for (auto& touch : touches)
    {
        auto location = touch->getLocation();

        addNewSpriteAtPosition(location);
    }
}

void ChipmunkTest::onAcceleration(Acceleration* acc, Event* event)
{
    static float prevX = 0, prevY = 0;

#define kFilterFactor 0.05f

    float accelX = (float)acc->x * kFilterFactor + (1 - kFilterFactor) * prevX;
    float accelY = (float)acc->y * kFilterFactor + (1 - kFilterFactor) * prevY;

    prevX = accelX;
    prevY = accelY;

    auto v = ax::Vec2(accelX, accelY);
    v      = v * 200;
    cpSpaceSetGravity(_space, cpv(v.x, v.y));
}

ChipmunkTests::ChipmunkTests()
{
    ADD_TEST_CASE(ChipmunkTest);
}