axmol/core/base/Touch.h

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

https://axmolengine.github.io/

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#ifndef __AX_TOUCH_H__
#define __AX_TOUCH_H__

#include "base/Object.h"
#include "math/Math.h"

NS_AX_BEGIN

/**
 * @addtogroup base
 * @{
 */

/** @class Touch
 * @brief Encapsulates the Touch information, such as touch point, id and so on,
 and provides the methods that commonly used.
 */
class AX_DLL Touch : public Object
{
public:
    /**
     * Dispatch mode, how the touches are dispatched.
     * @js NA
     */
    enum class DispatchMode
    {
        ALL_AT_ONCE, /** All at once. */
        ONE_BY_ONE,  /** One by one. */
    };

    /** Constructor.
     * @js ctor
     */
    Touch() : _id(0), _startPointCaptured(false), _curForce(0.f), _maxForce(0.f) {}

    /** Returns the current touch location in OpenGL coordinates.
     *
     * @return The current touch location in OpenGL coordinates.
     */
    Vec2 getLocation() const;
    /** Returns the previous touch location in OpenGL coordinates.
     *
     * @return The previous touch location in OpenGL coordinates.
     */
    Vec2 getPreviousLocation() const;
    /** Returns the start touch location in OpenGL coordinates.
     *
     * @return The start touch location in OpenGL coordinates.
     */
    Vec2 getStartLocation() const;
    /** Returns the delta of 2 current touches locations in screen coordinates.
     *
     * @return The delta of 2 current touches locations in screen coordinates.
     */
    Vec2 getDelta() const;
    /** Returns the current touch location in screen coordinates.
     *
     * @return The current touch location in screen coordinates.
     */
    Vec2 getLocationInView() const;
    /** Returns the previous touch location in screen coordinates.
     *
     * @return The previous touch location in screen coordinates.
     */
    Vec2 getPreviousLocationInView() const;
    /** Returns the start touch location in screen coordinates.
     *
     * @return The start touch location in screen coordinates.
     */
    Vec2 getStartLocationInView() const;

    /** Set the touch information. It always used to monitor touch event.
     *
     * @param id A given id
     * @param x A given x coordinate.
     * @param y A given y coordinate.
     */
    void setTouchInfo(int id, float x, float y)
    {
        _id        = id;
        _prevPoint = _point;
        _point.x   = x;
        _point.y   = y;
        _curForce  = 0.0f;
        _maxForce  = 0.0f;
        if (!_startPointCaptured)
        {
            _startPoint         = _point;
            _startPointCaptured = true;
            _prevPoint          = _point;
        }
    }

    /** Set the touch information. It always used to monitor touch event.
     *
     * @param id A given id
     * @param x A given x coordinate.
     * @param y A given y coordinate.
     * @param force Current force for 3d touch.
     * @param maxForce maximum possible force for 3d touch.
     */
    void setTouchInfo(int id, float x, float y, float force, float maxForce)
    {
        _id        = id;
        _prevPoint = _point;
        _point.x   = x;
        _point.y   = y;
        _curForce  = force;
        _maxForce  = maxForce;
        if (!_startPointCaptured)
        {
            _startPoint         = _point;
            _startPointCaptured = true;
            _prevPoint          = _point;
        }
    }
    /** Get touch id.
     * @js getId
     * @lua getId
     *
     * @return The id of touch.
     */
    int getID() const { return _id; }
    /** Returns the current touch force for 3d touch.
     *
     * @return The current touch force for 3d touch.
     */
    float getCurrentForce() const;
    /** Returns the maximum touch force for 3d touch.
     *
     * @return The maximum touch force for 3d touch.
     */
    float getMaxForce() const;

private:
    int _id;
    bool _startPointCaptured;
    Vec2 _startPoint;
    Vec2 _point;
    Vec2 _prevPoint;
    float _curForce;
    float _maxForce;
};

// end of base group
/// @}

NS_AX_END

#endif  // __PLATFORM_TOUCH_H__