Misaki
98 lines
2.4 KiB
C++
98 lines
2.4 KiB
C++
/**
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* Copyright(c) Live2D Inc. All rights reserved.
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*
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* Use of this source code is governed by the Live2D Open Software license
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* that can be found at https://www.live2d.com/eula/live2d-open-software-license-agreement_en.html.
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*/
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#include "TouchManager.hpp"
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#include <math.h>
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TouchManager::TouchManager()
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: _startY(0.0f)
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, _startX(0.0f)
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, _lastX(0.0f)
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, _lastY(0.0f)
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, _lastX1(0.0f)
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, _lastY1(0.0f)
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, _lastX2(0.0f)
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, _lastY2(0.0f)
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, _lastTouchDistance(0.0f)
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, _deltaX(0.0f)
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, _deltaY(0.0f)
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, _scale(1.0f)
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, _touchSingle(false)
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, _flipAvailable(false)
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{ }
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void TouchManager::TouchesBegan(float deviceX, float deviceY)
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{
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_lastX = deviceX;
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_lastY = deviceY;
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_startX = deviceX;
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_startY = deviceY;
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_lastTouchDistance = -1.0f;
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_flipAvailable = true;
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_touchSingle = true;
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}
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void TouchManager::TouchesMoved(float deviceX, float deviceY)
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{
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_lastX = deviceX;
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_lastY = deviceY;
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_lastTouchDistance = -1.0f;
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_touchSingle = true;
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}
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void TouchManager::TouchesMoved(float deviceX1, float deviceY1, float deviceX2, float deviceY2)
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{
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float distance = CalculateDistance(deviceX1, deviceY1, deviceX2, deviceY2);
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float centerX = (deviceX1 + deviceX2) * 0.5f;
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float centerY = (deviceY1 + deviceY2) * 0.5f;
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if (_lastTouchDistance > 0.0f)
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{
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_scale = powf(distance / _lastTouchDistance, 0.75f);
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_deltaX = CalculateMovingAmount(deviceX1 - _lastX1, deviceX2 - _lastX2);
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_deltaY = CalculateMovingAmount(deviceY1 - _lastY1, deviceY2 - _lastY2);
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}
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else
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{
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_scale = 1.0f;
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_deltaX = 0.0f;
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_deltaY = 0.0f;
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}
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_lastX = centerX;
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_lastY = centerY;
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_lastX1 = deviceX1;
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_lastY1 = deviceY1;
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_lastX2 = deviceX2;
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_lastY2 = deviceY2;
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_lastTouchDistance = distance;
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_touchSingle = false;
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}
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float TouchManager::GetFlickDistance() const
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{
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return CalculateDistance(_startX, _startY, _lastX, _lastY);
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}
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float TouchManager::CalculateDistance(float x1, float y1, float x2, float y2) const
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{
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return sqrtf((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2));
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}
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float TouchManager::CalculateMovingAmount(float v1, float v2)
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{
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if ((v1 > 0.0f) != (v2 > 0.0f))
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{
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return 0.0f;
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}
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float sign = v1 > 0.0f ? 1.0f : -1.0f;
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float absoluteValue1 = fabsf(v1);
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float absoluteValue2 = fabsf(v2);
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return sign * ((absoluteValue1 < absoluteValue2) ? absoluteValue1 : absoluteValue2);
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}
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