Warning, file /education/kmplot/kmplot/parameteranimator.cpp was not indexed or was modified since last indexation (in which case cross-reference links may be missing, inaccurate or erroneous).

 /*
     KmPlot - a math. function plotter for the KDE-Desktop
 
     SPDX-FileCopyrightText: 2006 David Saxton <david@bluehaze.org>
 
     This file is part of the KDE Project.
     KmPlot is part of the KDE-EDU Project.
 
     SPDX-License-Identifier: GPL-2.0-or-later
 
 */
 
 #include "parameteranimator.h"
 #include "ui_parameteranimator.h"
 #include "view.h"
 
 #include <KConfigGroup>
 
 #include <QDialogButtonBox>
 #include <QIcon>
 #include <QTimer>
 
 #include <assert.h>
 #include <cmath>
 
 using namespace std;
 
 #ifndef KDEWIN_MATH_H
 double inline log(int n)
 {
     return log(double(n));
 }
 #endif
 
 class ParameterAnimatorWidget : public QWidget, public Ui::ParameterAnimator
 {
 public:
     ParameterAnimatorWidget(QWidget *parent = 0)
         : QWidget(parent)
     {
         setupUi(this);
     }
 };
 
 // BEGIN class ParameterAnimator
 ParameterAnimator::ParameterAnimator(QWidget *parent, Function *function)
     : QDialog(parent)
     , m_function(function)
 {
     m_widget = new ParameterAnimatorWidget(this);
 
     setWindowTitle(i18nc("@title:window", "Parameter Animator"));
     QDialogButtonBox *buttonBox = new QDialogButtonBox(QDialogButtonBox::Close);
     connect(buttonBox, &QDialogButtonBox::rejected, this, &ParameterAnimator::reject);
 
     QVBoxLayout *dialogLayout = new QVBoxLayout(this);
     dialogLayout->addWidget(m_widget);
     dialogLayout->addWidget(buttonBox);
 
     m_mode = Paused;
     m_currentValue = 0;
     m_function->m_parameters.animating = true;
     m_function->k = m_currentValue;
 
     if (function->eq[0]->usesParameter())
         m_widget->warningLabel->hide();
 
     m_timer = new QTimer(this);
     connect(m_timer, &QTimer::timeout, this, &ParameterAnimator::step);
 
     m_widget->gotoInitial->setIcon(QIcon::fromTheme("go-first"));
     m_widget->gotoFinal->setIcon(QIcon::fromTheme("go-last"));
     m_widget->stepBackwards->setIcon(QIcon::fromTheme("go-previous"));
     m_widget->stepForwards->setIcon(QIcon::fromTheme("go-next"));
     m_widget->pause->setIcon(QIcon::fromTheme("media-playback-pause"));
 
     connect(m_widget->gotoInitial, &QToolButton::clicked, this, &ParameterAnimator::gotoInitial);
     connect(m_widget->gotoFinal, &QToolButton::clicked, this, &ParameterAnimator::gotoFinal);
     connect(m_widget->stepBackwards, &QToolButton::toggled, this, &ParameterAnimator::stepBackwards);
     connect(m_widget->stepForwards, &QToolButton::toggled, this, &ParameterAnimator::stepForwards);
     connect(m_widget->pause, &QToolButton::clicked, this, &ParameterAnimator::pause);
     connect(m_widget->speed, &QSlider::valueChanged, this, &ParameterAnimator::updateSpeed);
 
     updateUI();
     updateFunctionParameter();
 
     connect(this, &ParameterAnimator::finished, this, &ParameterAnimator::deleteLater);
 }
 
 ParameterAnimator::~ParameterAnimator()
 {
     qDebug();
     m_function->m_parameters.animating = false;
     View::self()->drawPlot();
 }
 
 void ParameterAnimator::step()
 {
     // This function shouldn't get called when we aren't actually stepping
     assert(m_mode != Paused);
 
     double dx = m_widget->step->value();
 
     bool increasing = ((m_mode == StepBackwards && (dx < 0)) || (m_mode == StepForwards && (dx > 0)));
     bool decreasing = ((m_mode == StepBackwards && (dx > 0)) || (m_mode == StepForwards && (dx < 0)));
 
     double upper = m_widget->final->value();
     double lower = m_widget->initial->value();
 
     if (lower > upper)
         qSwap(lower, upper);
 
     if ((increasing && (m_currentValue >= upper)) || (decreasing && (m_currentValue <= lower))) {
         stopStepping();
         return;
     }
 
     if (m_mode == StepForwards)
         m_currentValue += dx;
     else
         m_currentValue -= dx;
 
     updateUI();
     updateFunctionParameter();
 }
 
 void ParameterAnimator::updateFunctionParameter()
 {
     m_function->k = m_currentValue;
     View::self()->drawPlot();
 }
 
 void ParameterAnimator::gotoInitial()
 {
     m_currentValue = m_widget->initial->value();
     updateUI();
     updateFunctionParameter();
 }
 
 void ParameterAnimator::gotoFinal()
 {
     m_currentValue = m_widget->final->value();
     updateUI();
     updateFunctionParameter();
 }
 
 void ParameterAnimator::stepBackwards(bool step)
 {
     if (!step) {
         pause();
         return;
     }
 
     m_mode = StepBackwards;
     startStepping();
     updateUI();
 }
 
 void ParameterAnimator::stepForwards(bool step)
 {
     if (!step) {
         pause();
         return;
     }
 
     m_mode = StepForwards;
     startStepping();
     updateUI();
 }
 
 void ParameterAnimator::pause()
 {
     m_mode = Paused;
     m_timer->stop();
     updateUI();
 }
 
 void ParameterAnimator::updateUI()
 {
     switch (m_mode) {
     case StepBackwards:
         m_widget->stepBackwards->setChecked(true);
         m_widget->stepForwards->setChecked(false);
         break;
 
     case StepForwards:
         m_widget->stepBackwards->setChecked(false);
         m_widget->stepForwards->setChecked(true);
         break;
 
     case Paused:
         m_widget->stepBackwards->setChecked(false);
         m_widget->stepForwards->setChecked(false);
         break;
     }
 
     m_widget->currentValue->setText(View::self()->posToString(m_currentValue, m_widget->step->value() * 1e-2, View::DecimalFormat));
 }
 
 void ParameterAnimator::updateSpeed()
 {
     if (m_mode != Paused)
         startStepping();
 }
 
 void ParameterAnimator::startStepping() const
 {
     double prop = (log(m_widget->speed->value()) - log(m_widget->speed->minimum())) / (log(m_widget->speed->maximum()) - log(m_widget->speed->minimum()));
 
     // prop = 0  ~ slowest
     // prop = 1  ~ fastest
 
     int min_ms = 40;
     int max_ms = 1000;
 
     int ms = int(prop * min_ms + (1 - prop) * max_ms);
     m_timer->start(ms);
 }
 
 void ParameterAnimator::stopStepping()
 {
     m_timer->stop();
     m_mode = Paused;
     updateUI();
 }
 // END class ParameterAnimator