mirror of
https://github.com/jkriege2/JKQtPlotter.git
synced 2024-12-26 10:31:39 +08:00
84 lines
3.3 KiB
C++
84 lines
3.3 KiB
C++
/** \example parsedfunctionplot.cpp
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* JKQTPlotter: Examples: Plotting Parsed Mathematical Functions as Line Graphs
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*
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* \ref JKQTPlotterParsedFunctionPlot
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*/
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#include <QApplication>
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#include <QLineEdit>
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#include <QCheckBox>
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#include <QFormLayout>
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#include <QDoubleSpinBox>
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#include "jkqtplotter/jkqtplotter.h"
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#include "jkqtplotter/graphs/jkqtpscatter.h"
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#include "jkqtplotter/graphs/jkqtpparsedfunction.h"
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int main(int argc, char* argv[])
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{
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QApplication app(argc, argv);
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// 1. create a window that conatins a line-edit to edit a function
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// and a JKQTPlotter to display the function, combine everything in a layout
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QWidget mainWin;
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QLineEdit* edit=new QLineEdit(&mainWin);
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edit->setToolTip("enter a function in dependence of the variable <tt>x</tt> and press ENTER to update the graph");
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QCheckBox* check=new QCheckBox("display sample points");
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QDoubleSpinBox* spinP1=new QDoubleSpinBox(&mainWin);
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spinP1->setValue(8);
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spinP1->setRange(-10000,10000);
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spinP1->setToolTip("enter a Value for parameter <tt>p1</tt> and press ENTER to update the graph");
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QDoubleSpinBox* spinP2=new QDoubleSpinBox(&mainWin);
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spinP2->setValue(4);
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spinP2->setRange(-10000,10000);
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spinP2->setToolTip("enter a Value for parameter <tt>p1</tt> and press ENTER to update the graph");
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JKQTPlotter* plot=new JKQTPlotter(&mainWin);
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QFormLayout* flayout=new QFormLayout;
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QVBoxLayout* layout=new QVBoxLayout;
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mainWin.setLayout(layout);
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flayout->addRow("equation:", edit);
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flayout->addRow("p1 =", spinP1);
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flayout->addRow("p2 =", spinP2);
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flayout->addRow("", check);
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layout->addLayout(flayout);
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layout->addWidget(plot);
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// 2. now we add a JKQTPXParsedFunctionLineGraph object, which will draw the function from
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// the line edit
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JKQTPXParsedFunctionLineGraph* parsedFunc=new JKQTPXParsedFunctionLineGraph(plot);
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plot->addGraph(parsedFunc);
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// finally we connect the line edit with the graph, whenever RETURN is pressed,
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// the graph is updated:
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auto updateGraphFunctor=
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[=]() {
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parsedFunc->setTitle(QString("user function: \\verb{"+edit->text()+"}, p_1=%1, p_2=%2").arg(spinP1->value()).arg(spinP2->value()));
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parsedFunc->setFunction(edit->text());
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parsedFunc->setParamsV(spinP1->value(), spinP2->value());
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parsedFunc->setDisplaySamplePoints(check->isChecked());
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plot->redrawPlot();
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};
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QObject::connect(edit, &QLineEdit::returnPressed, updateGraphFunctor);
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QObject::connect(edit, &QLineEdit::editingFinished, updateGraphFunctor);
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QObject::connect(check, &QCheckBox::toggled, updateGraphFunctor);
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QObject::connect(spinP1, &QDoubleSpinBox::editingFinished, updateGraphFunctor);
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QObject::connect(spinP2, &QDoubleSpinBox::editingFinished, updateGraphFunctor);
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edit->setText("sin(x*p1)*exp(-x/p2)");
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updateGraphFunctor();
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// 3. set some axis properties (we use LaTeX for nice equation rendering)
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plot->getXAxis()->setAxisLabel(QObject::tr("x-axis"));
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plot->getYAxis()->setAxisLabel(QObject::tr("y-axis"));
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// 4. scale the plot so the graph is contained
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plot->setXY(-10,10,-10,10);
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// show window and make it a decent size
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mainWin.show();
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mainWin.resize(600,400);
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return app.exec();
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}
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