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/*
* Copyright (C) 2013 Team XBMC
* http://xbmc.org
*
* This Program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This Program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with XBMC; see the file COPYING. If not, see
* <http://www.gnu.org/licenses/>.
*
*/
#include <math.h>
#include "GenericTouchRotateDetector.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 < 0 || index >= TOUCH_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 < 0 || index >= TOUCH_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 < 0 || index >= TOUCH_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 / 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 < 0 || index >= TOUCH_MAX_POINTERS)
return false;
if (m_done)
return true;
// update the internal pointers
m_pointers[index] = pointer;
return true;
}
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