File indexing completed on 2023-05-30 10:42:17

 /*
     KmPlot - a math. function plotter for the KDE-Desktop
 
     SPDX-FileCopyrightText: 2004 Fredrik Edemar <f_edemar@linux.se>
     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 "functiontools.h"
 #include "ui_functiontools.h"
 #include "view.h"
 #include "xparser.h"
 #include <QDialogButtonBox>
 
 class FunctionToolsWidget : public QWidget, public Ui::FunctionTools
 {
 public:
     FunctionToolsWidget(QWidget *parent = 0)
         : QWidget(parent)
     {
         setupUi(this);
     }
 };
 
 // BEGIN class FunctionTools
 FunctionTools::FunctionTools(QWidget *parent)
     : QDialog(parent)
 {
     m_widget = new FunctionToolsWidget(this);
 
     QDialogButtonBox *buttonBox = new QDialogButtonBox(QDialogButtonBox::Close);
     connect(buttonBox, &QDialogButtonBox::rejected, this, &FunctionTools::reject);
     QVBoxLayout *dialogLayout = new QVBoxLayout(this);
     dialogLayout->addWidget(m_widget);
     dialogLayout->addWidget(buttonBox);
 
     init(CalculateArea);
 
     connect(m_widget->min, &EquationEdit::editingFinished, this, &FunctionTools::rangeEdited);
     connect(m_widget->max, &EquationEdit::editingFinished, this, &FunctionTools::rangeEdited);
     connect(m_widget->list, &QListWidget::currentRowChanged, this, &FunctionTools::equationSelected);
 }
 
 FunctionTools::~FunctionTools()
 {
 }
 
 void FunctionTools::init(Mode m)
 {
     m_mode = m;
 
     switch (m_mode) {
     case FindMinimum: {
         m_widget->rangeTitle->setText(i18n("Search between:"));
         setWindowTitle(i18nc("@title:window", "Find Minimum Point"));
         break;
     }
 
     case FindMaximum: {
         m_widget->rangeTitle->setText(i18n("Search between:"));
         setWindowTitle(i18nc("@title:window", "Find Maximum Point"));
         break;
     }
 
     case CalculateArea: {
         m_widget->rangeTitle->setText(i18n("Calculate the area between:"));
         setWindowTitle(i18nc("@title:window", "Area Under Graph"));
         break;
     }
     }
 
     m_widget->min->setText(XParser::self()->number(View::self()->m_xmin));
     m_widget->max->setText(XParser::self()->number(View::self()->m_xmax));
     m_widget->min->setFocus();
 
     updateEquationList();
     setEquation(EquationPair(View::self()->m_currentPlot, 0));
 }
 
 void FunctionTools::updateEquationList()
 {
     EquationPair previousEquation = equation();
 
     m_widget->list->clear();
     m_equations.clear();
 
     for (Function *function : qAsConst(XParser::self()->m_ufkt)) {
         if (function->type() != Function::Cartesian && function->type() != Function::Differential)
             continue;
 
         QList<Plot> plots = function->plots();
 
         for (int i = 0; i < function->eq.size(); ++i) {
             for (const Plot &plot : qAsConst(plots))
                 m_equations << EquationPair(plot, i);
         }
     }
 
     for (const EquationPair &eq : qAsConst(m_equations)) {
         Equation *equation = eq.first.function()->eq[eq.second];
         QListWidgetItem *item = new QListWidgetItem(equation->fstr(), m_widget->list);
         item->setForeground(eq.first.color());
     }
 
     setEquation(previousEquation);
 }
 
 EquationPair FunctionTools::equation() const
 {
     int row = m_widget->list->currentRow();
     if (row < 0 || row >= m_equations.size())
         return EquationPair();
     else
         return m_equations[row];
 }
 
 void FunctionTools::setEquation(const EquationPair &equation)
 {
     int row = m_equations.indexOf(equation);
     if (row < 0)
         row = 0;
     m_widget->list->setCurrentRow(row);
     equationSelected(row);
 }
 
 void FunctionTools::equationSelected(int equation)
 {
     if (equation < 0 || equation >= m_equations.size())
         return;
     EquationPair current = m_equations[equation];
 
     switch (m_mode) {
     case FindMinimum:
         findMinimum(current);
         break;
 
     case FindMaximum:
         findMaximum(current);
         break;
 
     case CalculateArea:
         calculateArea(current);
         break;
     }
 }
 
 void FunctionTools::rangeEdited()
 {
     switch (m_mode) {
     case FindMinimum:
         findMinimum(equation());
         break;
 
     case FindMaximum:
         findMaximum(equation());
         break;
 
     case CalculateArea:
         calculateArea(equation());
         break;
     }
 }
 
 void FunctionTools::findMinimum(const EquationPair &equation)
 {
     if (!equation.first.function())
         return;
 
     QPointF extremum = View::self()->findMinMaxValue(equation.first, View::Minimum, m_widget->min->value(), m_widget->max->value());
 
     m_widget->rangeResult->setText(i18n("Minimum is at x = %1, %2(x) = %3", extremum.x(), equation.first.function()->eq[0]->name(), extremum.y()));
 }
 
 void FunctionTools::findMaximum(const EquationPair &equation)
 {
     if (!equation.first.function())
         return;
 
     QPointF extremum = View::self()->findMinMaxValue(equation.first, View::Maximum, m_widget->min->value(), m_widget->max->value());
 
     m_widget->rangeResult->setText(i18n("Maximum is at x = %1, %2(x) = %3", extremum.x(), equation.first.function()->eq[0]->name(), extremum.y()));
 }
 
 void FunctionTools::calculateArea(const EquationPair &equation)
 {
     if (!equation.first.function())
         return;
 
     IntegralDrawSettings s;
     s.plot = equation.first;
     s.dmin = m_widget->min->value();
     s.dmax = m_widget->max->value();
 
     double area = View::self()->areaUnderGraph(s);
 
     m_widget->rangeResult->setText(i18n("Area is %1", area));
 }
 // END class FunctionTools