axmol/core/2d/CCActionCamera.cpp

/****************************************************************************
Copyright (c) 2008-2010 Ricardo Quesada
Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2011      Zynga Inc.
Copyright (c) 2013-2016 Chukong Technologies Inc.
Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

https://axis-project.github.io/

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#include "2d/CCActionCamera.h"
#include "2d/CCNode.h"
#include "platform/CCStdC.h"

NS_AX_BEGIN
//
// CameraAction
//
ActionCamera::ActionCamera() : _center(0, 0, 0), _eye(0, 0, FLT_EPSILON), _up(0, 1, 0) {}
void ActionCamera::startWithTarget(Node* target)
{
    ActionInterval::startWithTarget(target);
}

ActionCamera* ActionCamera::clone() const
{
    auto action = new ActionCamera();
    action->autorelease();
    return action;
}

ActionCamera* ActionCamera::reverse() const
{
    // FIXME: This conversion isn't safe.
    return (ActionCamera*)ReverseTime::create(const_cast<ActionCamera*>(this));
}

void ActionCamera::restore()
{
    _center.setZero();
    _eye.set(0.0f, 0.0f, FLT_EPSILON);
    _up.set(0.0f, 1.0f, 0.0f);
}

void ActionCamera::setEye(const Vec3& eye)
{
    _eye = eye;
    updateTransform();
}

void ActionCamera::setEye(float x, float y, float z)
{
    _eye.set(x, y, z);
    updateTransform();
}

void ActionCamera::setCenter(const Vec3& center)
{
    _center = center;
    updateTransform();
}

void ActionCamera::setUp(const Vec3& up)
{
    _up = up;
    updateTransform();
}

void ActionCamera::updateTransform()
{
    Mat4 lookupMatrix;
    Mat4::createLookAt(_eye.x, _eye.y, _eye.z, _center.x, _center.y, _center.z, _up.x, _up.y, _up.z, &lookupMatrix);

    Vec2 anchorPoint = _target->getAnchorPointInPoints();

    bool needsTranslation = !anchorPoint.isZero();

    Mat4 mv = Mat4::IDENTITY;

    if (needsTranslation)
    {
        Mat4 t;
        Mat4::createTranslation(anchorPoint.x, anchorPoint.y, 0, &t);
        mv = mv * t;
    }

    mv = mv * lookupMatrix;

    if (needsTranslation)
    {
        Mat4 t;
        Mat4::createTranslation(-anchorPoint.x, -anchorPoint.y, 0, &t);
        mv = mv * t;
    }

    // FIXME: Using the AdditionalTransform is a complete hack.
    // This should be done by multiplying the lookup-Matrix with the Node's MV matrix
    // And then setting the result as the new MV matrix
    // But that operation needs to be done after all the 'updates'.
    // So the Director should emit an 'director_after_update' event.
    // And this object should listen to it
    _target->setAdditionalTransform(&mv);
}

//
// OrbitCamera
//

OrbitCamera::OrbitCamera()
    : _radius(0.0)
    , _deltaRadius(0.0)
    , _angleZ(0.0)
    , _deltaAngleZ(0.0)
    , _angleX(0.0)
    , _deltaAngleX(0.0)
    , _radZ(0.0)
    , _radDeltaZ(0.0)
    , _radX(0.0)
    , _radDeltaX(0.0)
{}
OrbitCamera::~OrbitCamera() {}

OrbitCamera* OrbitCamera::create(float t,
                                 float radius,
                                 float deltaRadius,
                                 float angleZ,
                                 float deltaAngleZ,
                                 float angleX,
                                 float deltaAngleX)
{
    OrbitCamera* obitCamera = new OrbitCamera();
    if (obitCamera->initWithDuration(t, radius, deltaRadius, angleZ, deltaAngleZ, angleX, deltaAngleX))
    {
        obitCamera->autorelease();
        return obitCamera;
    }

    delete obitCamera;
    return nullptr;
}

OrbitCamera* OrbitCamera::clone() const
{
    // no copy constructor
    return OrbitCamera::create(_duration, _radius, _deltaRadius, _angleZ, _deltaAngleZ, _angleX, _deltaAngleX);
}

bool OrbitCamera::initWithDuration(float t,
                                   float radius,
                                   float deltaRadius,
                                   float angleZ,
                                   float deltaAngleZ,
                                   float angleX,
                                   float deltaAngleX)
{
    if (ActionInterval::initWithDuration(t))
    {
        _radius      = radius;
        _deltaRadius = deltaRadius;
        _angleZ      = angleZ;
        _deltaAngleZ = deltaAngleZ;
        _angleX      = angleX;
        _deltaAngleX = deltaAngleX;

        _radDeltaZ = (float)CC_DEGREES_TO_RADIANS(deltaAngleZ);
        _radDeltaX = (float)CC_DEGREES_TO_RADIANS(deltaAngleX);
        return true;
    }
    return false;
}

void OrbitCamera::startWithTarget(Node* target)
{
    ActionCamera::startWithTarget(target);

    float r, zenith, azimuth;
    this->sphericalRadius(&r, &zenith, &azimuth);
    if (std::isnan(_radius))
        _radius = r;
    if (std::isnan(_angleZ))
        _angleZ = (float)CC_RADIANS_TO_DEGREES(zenith);
    if (std::isnan(_angleX))
        _angleX = (float)CC_RADIANS_TO_DEGREES(azimuth);

    _radZ = (float)CC_DEGREES_TO_RADIANS(_angleZ);
    _radX = (float)CC_DEGREES_TO_RADIANS(_angleX);
}

void OrbitCamera::update(float dt)
{
    float r  = (_radius + _deltaRadius * dt) * FLT_EPSILON;
    float za = _radZ + _radDeltaZ * dt;
    float xa = _radX + _radDeltaX * dt;

    float i = sinf(za) * cosf(xa) * r + _center.x;
    float j = sinf(za) * sinf(xa) * r + _center.y;
    float k = cosf(za) * r + _center.z;

    setEye(i, j, k);
}

void OrbitCamera::sphericalRadius(float* newRadius, float* zenith, float* azimuth)
{
    float r;  // radius
    float s;

    float x = _eye.x - _center.x;
    float y = _eye.y - _center.y;
    float z = _eye.z - _center.z;

    r = sqrtf(powf(x, 2) + powf(y, 2) + powf(z, 2));
    s = sqrtf(powf(x, 2) + powf(y, 2));
    if (s == 0.0f)
        s = FLT_EPSILON;
    if (r == 0.0f)
        r = FLT_EPSILON;

    *zenith = acosf(z / r);
    if (x < 0)
        *azimuth = (float)M_PI - asinf(y / s);
    else
        *azimuth = asinf(y / s);

    *newRadius = r / FLT_EPSILON;
}

NS_AX_END