axmol/extensions/GUI/CCControlExtension/CCControlPotentiometer.cpp

/*
 * Copyright (c) 2012 cocos2d-x.org
 * https://adxeproject.github.io/
 *
 * Copyright 2012 Yannick Loriot. All rights reserved.
 * http://yannickloriot.com
 *
 * Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.
 *
 * 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 "CCControlPotentiometer.h"

NS_CC_EXT_BEGIN

ControlPotentiometer::ControlPotentiometer()
    : _value(0.0f), _minimumValue(0.0f), _maximumValue(0.0f), _thumbSprite(nullptr), _progressTimer(nullptr)
{}

ControlPotentiometer::~ControlPotentiometer()
{
    CC_SAFE_RELEASE(_thumbSprite);
    CC_SAFE_RELEASE(_progressTimer);
}

ControlPotentiometer* ControlPotentiometer::create(const char* backgroundFile,
                                                   const char* progressFile,
                                                   const char* thumbFile)
{
    ControlPotentiometer* pRet = new ControlPotentiometer();
    // Prepare track for potentiometer
    Sprite* backgroundSprite = Sprite::create(backgroundFile);

    // Prepare thumb for potentiometer
    Sprite* thumbSprite = Sprite::create(thumbFile);

    // Prepare progress for potentiometer
    ProgressTimer* progressTimer = ProgressTimer::create(Sprite::create(progressFile));
    // progressTimer.type              = ProgressTimer::RADIALCW;
    if (pRet->initWithTrackSprite_ProgressTimer_ThumbSprite(backgroundSprite, progressTimer, thumbSprite))
    {
        pRet->autorelease();
    }
    else
    {
        CC_SAFE_DELETE(pRet);
    }
    return pRet;
}

bool ControlPotentiometer::initWithTrackSprite_ProgressTimer_ThumbSprite(Sprite* trackSprite,
                                                                         ProgressTimer* progressTimer,
                                                                         Sprite* thumbSprite)
{
    if (Control::init())
    {
        setProgressTimer(progressTimer);
        setThumbSprite(thumbSprite);
        thumbSprite->setPosition(progressTimer->getPosition());

        addChild(thumbSprite, 2);
        addChild(progressTimer, 1);
        addChild(trackSprite);

        setContentSize(trackSprite->getContentSize());

        // Init default values
        _minimumValue = 0.0f;
        _maximumValue = 1.0f;
        setValue(_minimumValue);
        return true;
    }
    return false;
}

void ControlPotentiometer::setEnabled(bool enabled)
{
    Control::setEnabled(enabled);
    if (_thumbSprite != nullptr)
    {
        _thumbSprite->setOpacity((enabled) ? 255 : 128);
    }
}

void ControlPotentiometer::setValue(float value)
{
    // set new value with sentinel
    if (value < _minimumValue)
    {
        value = _minimumValue;
    }

    if (value > _maximumValue)
    {
        value = _maximumValue;
    }

    _value = value;

    // Update thumb and progress position for new value
    float percent = (value - _minimumValue) / (_maximumValue - _minimumValue);
    _progressTimer->setPercentage(percent * 100.0f);
    _thumbSprite->setRotation(percent * 360.0f);

    sendActionsForControlEvents(Control::EventType::VALUE_CHANGED);
}

float ControlPotentiometer::getValue()
{
    return _value;
}

void ControlPotentiometer::setMinimumValue(float minimumValue)
{
    _minimumValue = minimumValue;

    if (_minimumValue >= _maximumValue)
    {
        _maximumValue = _minimumValue + 1.0f;
    }

    setValue(_maximumValue);
}

float ControlPotentiometer::getMinimumValue()
{
    return _minimumValue;
}

void ControlPotentiometer::setMaximumValue(float maximumValue)
{
    _maximumValue = maximumValue;

    if (_maximumValue <= _minimumValue)
    {
        _minimumValue = _maximumValue - 1.0f;
    }

    setValue(_minimumValue);
}

float ControlPotentiometer::getMaximumValue()
{
    return _maximumValue;
}

bool ControlPotentiometer::isTouchInside(Touch* touch)
{
    Vec2 touchLocation = this->getTouchLocation(touch);

    float distance = this->distanceBetweenPointAndPoint(_progressTimer->getPosition(), touchLocation);

    return distance < MIN(getContentSize().width / 2, getContentSize().height / 2);
}

bool ControlPotentiometer::onTouchBegan(Touch* pTouch, Event* /*pEvent*/)
{
    if (!this->isTouchInside(pTouch) || !this->isEnabled() || !isVisible())
    {
        return false;
    }

    _previousLocation = this->getTouchLocation(pTouch);

    this->potentiometerBegan(_previousLocation);

    return true;
}

void ControlPotentiometer::onTouchMoved(Touch* pTouch, Event* /*pEvent*/)
{
    Vec2 location = this->getTouchLocation(pTouch);

    this->potentiometerMoved(location);
}

void ControlPotentiometer::onTouchEnded(Touch* /*pTouch*/, Event* /*pEvent*/)
{
    this->potentiometerEnded(Vec2::ZERO);
}

float ControlPotentiometer::distanceBetweenPointAndPoint(Vec2 point1, Vec2 point2)
{
    float dx = point1.x - point2.x;
    float dy = point1.y - point2.y;
    return sqrt(dx * dx + dy * dy);
}

float ControlPotentiometer::angleInDegreesBetweenLineFromPoint_toPoint_toLineFromPoint_toPoint(Vec2 beginLineA,
                                                                                               Vec2 endLineA,
                                                                                               Vec2 beginLineB,
                                                                                               Vec2 endLineB)
{
    float a = endLineA.x - beginLineA.x;
    float b = endLineA.y - beginLineA.y;
    float c = endLineB.x - beginLineB.x;
    float d = endLineB.y - beginLineB.y;

    float atanA = atan2(a, b);
    float atanB = atan2(c, d);

    // convert radiants to degrees
    return (atanA - atanB) * 180 / M_PI;
}

void ControlPotentiometer::potentiometerBegan(Vec2 /*location*/)
{
    setSelected(true);
    getThumbSprite()->setColor(Color3B::GRAY);
}

void ControlPotentiometer::potentiometerMoved(Vec2 location)
{
    float angle = this->angleInDegreesBetweenLineFromPoint_toPoint_toLineFromPoint_toPoint(
        _progressTimer->getPosition(), location, _progressTimer->getPosition(), _previousLocation);

    // fix value, if the 12 o'clock position is between location and previousLocation
    if (angle > 180)
    {
        angle -= 360;
    }
    else if (angle < -180)
    {
        angle += 360;
    }

    setValue(_value + angle / 360.0f * (_maximumValue - _minimumValue));

    _previousLocation = location;
}

void ControlPotentiometer::potentiometerEnded(Vec2 /*location*/)
{
    getThumbSprite()->setColor(Color3B::WHITE);
    setSelected(false);
}

NS_CC_EXT_END