File indexing completed on 2025-02-02 04:54:38

 // SPDX-License-Identifier: GPL-2.0-or-later
 // SPDX-FileCopyrightText: 2018 Kevin Ottens <ervin@kde.org>
 
 #include "pressureequation.h"
 
 #include <QDebug>
 #include <cmath>
 
 namespace
 {
 float sigmoid(float x)
 {
     const auto lambda = 5.0f;
     return 1.0f / (1.0f + std::exp(-lambda * x));
 }
 
 float computeWidth(float minWidth, float maxWidth, float pressure)
 {
     const auto alpha = sigmoid(2.0f * pressure - 1.0f);
     return (1.0f - alpha) * minWidth + alpha * maxWidth;
 }
 }
 
 float PressureEquation::minWidth() const
 {
     return m_minWidth;
 }
 
 float PressureEquation::maxWidth() const
 {
     return m_maxWidth;
 }
 
 float PressureEquation::pressure() const
 {
     return m_pressure;
 }
 
 float PressureEquation::width() const
 {
     return m_width;
 }
 
 void PressureEquation::setMinWidth(float minWidth)
 {
     if (qFuzzyCompare(m_minWidth, minWidth))
         return;
 
     m_minWidth = minWidth;
     Q_EMIT minWidthChanged(minWidth);
     updateWidth();
 }
 
 void PressureEquation::setMaxWidth(float maxWidth)
 {
     if (qFuzzyCompare(m_maxWidth, maxWidth))
         return;
 
     m_maxWidth = maxWidth;
     Q_EMIT maxWidthChanged(maxWidth);
     updateWidth();
 }
 
 void PressureEquation::setPressure(float pressure)
 {
     if (qFuzzyCompare(m_pressure, pressure))
         return;
 
     m_pressure = pressure;
     Q_EMIT pressureChanged(pressure);
     updateWidth();
 }
 
 void PressureEquation::updateWidth()
 {
     m_width = computeWidth(m_minWidth, m_maxWidth, m_pressure);
     Q_EMIT widthChanged(m_width);
 }