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/*
* Copyright (C) 2013-2018 Team Kodi
* This file is part of Kodi - https://kodi.tv
*
* SPDX-License-Identifier: GPL-2.0-or-later
* See LICENSES/README.md for more information.
*/
#include "GenericTouchRotateDetector.h"
#include <math.h>
#ifndef M_PI
#define M_PI 3.1415926535897932384626433832795028842
#endif
CGenericTouchRotateDetector::CGenericTouchRotateDetector(ITouchActionHandler* handler, float dpi)
: IGenericTouchGestureDetector(handler, dpi), m_angle(0.0f)
{
}
bool CGenericTouchRotateDetector::OnTouchDown(unsigned int index, const Pointer& pointer)
{
if (index >= MAX_POINTERS)
return false;
if (m_done)
return true;
m_pointers[index] = pointer;
m_angle = 0.0f;
return true;
}
bool CGenericTouchRotateDetector::OnTouchUp(unsigned int index, const Pointer& pointer)
{
if (index >= MAX_POINTERS)
return false;
if (m_done)
return true;
// after lifting the primary pointer, the secondary pointer will
// become the primary pointer in the next event
if (index == 0)
{
m_pointers[0] = m_pointers[1];
index = 1;
}
m_pointers[index].reset();
if (!m_pointers[0].valid() && !m_pointers[1].valid())
m_done = true;
return true;
}
bool CGenericTouchRotateDetector::OnTouchMove(unsigned int index, const Pointer& pointer)
{
if (index >= MAX_POINTERS)
return false;
if (m_done)
return true;
// update the internal pointers
m_pointers[index] = pointer;
Pointer& primaryPointer = m_pointers[0];
Pointer& secondaryPointer = m_pointers[1];
if (!primaryPointer.valid() || !secondaryPointer.valid() ||
(!primaryPointer.moving && !secondaryPointer.moving))
return false;
CVector last = primaryPointer.last - secondaryPointer.last;
CVector current = primaryPointer.current - secondaryPointer.current;
float length = last.length() * current.length();
if (length != 0.0f)
{
float centerX = (primaryPointer.current.x + secondaryPointer.current.x) / 2;
float centerY = (primaryPointer.current.y + secondaryPointer.current.y) / 2;
float scalar = last.scalar(current);
float angle = acos(scalar / length) * 180.0f / static_cast<float>(M_PI);
// make sure the result of acos is a valid number
if (angle == angle)
{
// calculate the direction of the rotation using the
// z-component of the cross-product of last and current
float direction = last.x * current.y - current.x * last.y;
if (direction < 0.0f)
m_angle -= angle;
else
m_angle += angle;
OnRotate(centerX, centerY, m_angle);
}
}
return true;
}
bool CGenericTouchRotateDetector::OnTouchUpdate(unsigned int index, const Pointer& pointer)
{
if (index >= MAX_POINTERS)
return false;
if (m_done)
return true;
// update the internal pointers
m_pointers[index] = pointer;
return true;
}
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