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https://github.com/jkriege2/JKQtPlotter.git
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73 lines
2.5 KiB
C++
73 lines
2.5 KiB
C++
/** \example evalcurve.cpp
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* Shows how to plot Mathematical Functions as Line Graphs with JKQTPlotter (as evaluated C/C++ functions)
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*
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* \ref JKQTPlotterEvalCurves
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*/
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#include <QApplication>
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#include <QVector>
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#include <QMap>
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#include "jkqtplotter/jkqtplotter.h"
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#include "jkqtplotter/graphs/jkqtpevaluatedparametriccurve.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 contains 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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JKQTPlotter* plot=new JKQTPlotter(&mainWin);
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QVBoxLayout* layout=new QVBoxLayout;
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mainWin.setLayout(layout);
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layout->addWidget(plot);
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// 2. now we add a JKQTPXYFunctionLineGraph object, which will draw a simple function
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// the function is defined as C++ inline function
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JKQTPXYFunctionLineGraph* func1=new JKQTPXYFunctionLineGraph(plot);
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func1->setPlotFunctionFunctor([](double t) ->QPointF {
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return QPointF(
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sin(t)*(exp(cos(t))-2.0*cos(4.0*t)-jkqtp_pow5(sin(t/12.0))),
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cos(t)*(exp(cos(t))-2.0*cos(4.0*t)-jkqtp_pow5(sin(t/12.0)))
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);
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});
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func1->setTRange(0, 12.0*JKQTPSTATISTICS_PI);
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func1->setTitle("C++-inline function: \"Butterfly Curve\"");
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plot->addGraph(func1);
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// 3. a second JKQTPXYFunctionLineGraph object shows how to use functions that
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// also take a parameter vector, in addition to the dependent variable t
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JKQTPXYFunctionLineGraph* func2=new JKQTPXYFunctionLineGraph(plot);
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func2->setPlotFunctionFunctor([](double t, const QVector<double>& params) ->QPointF {
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return QPointF(
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3.0*sin(params[0]*t+params[2])+8.0,
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3.0*sin(params[1]*t)
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);
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});
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// now we define the 3 parameters of the function
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func2->setParamsV(5, 4, JKQTPSTATISTICS_PI/4.0);
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// and define the range over which to evaluate
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func2->setTRange(0, 2.0*JKQTPSTATISTICS_PI);
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func2->setTitle("C++-inline function $[ sin(5{\\cdot}t+\\pi/4), sin(4{\\cdot}t) ]$");
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plot->addGraph(func2);
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// 8. 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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plot->getPlotter()->setKeyPosition(JKQTPKeyOutsideBottomLeft);
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// 4. scale the plot so the graph is contained
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plot->setXY(-3,12,-3.2,3.2);
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// show window and make it a decent size
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mainWin.show();
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mainWin.resize(800,800);
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return app.exec();
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}
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