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https://github.com/jkriege2/JKQtPlotter.git
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106 lines
5.0 KiB
C++
106 lines
5.0 KiB
C++
#include <QApplication>
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#include "jkqtplotter/jkqtplotter.h"
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#include "jkqtplotter/jkqtpgeoelements.h"
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#include "jkqtplottertools/jkqtptools.h"
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#define sqr(x) ((x)*(x))
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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 plotter window and get a pointer to the internal datastore (for convenience)
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JKQtPlotter plot;
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JKQTPdatastore* ds=plot.getDatastore();
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// 2. now we create data a vector of x-values for a simple plot (resonance curve with different damping value D)
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// see https://en.wikipedia.org/wiki/Resonance
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QVector<double> X;
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QVector<double> D { 0.001, 0.1, 1, 10};
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const int Ndata=500; // number of plot points in each curve
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for (int i=0; i<Ndata; i++) {
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const double x=double(i)/double(Ndata)*3;
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X<<x;
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//Y1<<1.0/sqrt(sqr(1-sqr(x))+sqr(2*x*D1));
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}
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// and copy it to the datastore
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size_t columnX=ds->addCopiedColumn(X, "x");
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// 3. now we make several plots for different values of D
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QVector<Qt::PenStyle> pens {Qt::SolidLine, Qt::DashLine, Qt::DotLine, Qt::DashDotLine, Qt::DashDotDotLine };
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for (int id=0; id<D.size(); id++) {
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// generate some plot data
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QVector<double> Y;
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for (auto& xx: X) {
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Y<<1.0/sqrt(sqr(1-sqr(xx))+sqr(2*xx*D[id]));
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}
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JKQTPxyLineGraph* graph=new JKQTPxyLineGraph(&plot);
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// copy data into datastore and immediately set the yColumn
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graph->set_xColumn(columnX);
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graph->set_yColumn(ds->addCopiedColumn(Y, "y"+QString::number(id)));
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// don't use symbols
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graph->set_symbol(JKQTPnoSymbol);
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// use one of different pens
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graph->set_style(pens[id%pens.size()]);
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// set width of graph line
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graph->set_lineWidth(1.5);
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// graph title is made from symbol+penstyle
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graph->set_title(QString("$D=\\delta/\\omega_0=%1$").arg(D[id]));
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// add the graph to the plot, so it is actually displayed
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plot.addGraph(graph);
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}
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// 4. Also we add a text-element in the plot to show the plotted function
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// This element (JKQTPgeoText) is taken from the set of geometric elements
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// and is simply parametrized by a position (1.25/10) and the text to display.
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// In addition you can also set the font size (here to 15)
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// Use '$...$' around the actual math string to ensure rendering with a math font
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// (the internal renderer uses XITS fonts by default, which are free and auto-distributed
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// and loaded in the library). If you don't use the math-mode modifiers, the default
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// font of the other rendering text is used, which might not be suitable for
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// high-quality math rendering.
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plot.addGraph(new JKQTPgeoText(&plot, 1.25, 10, "$\\frac{A}{A_{stat}}=\\frac{1}{\\sqrt{\\left(1-\\eta^2\\right)^2+\\left(2{\\eta}D\\right)^2}}$", 15));
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// 5. set y-axis to logarithmic (x-axis would be analogous, but using `plot.get_xAxis()`)
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plot.get_yAxis()->set_logAxis(true);
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// now we set the number of label ticks to 9 (you give the count if minor between two majors,
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// so if you want ticks for 1,2,3,...,10,20,30,...,100... you need to use 9:
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plot.get_yAxis()->set_minorTicks(9);
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// the minor grid is not shown by default. You can switch it on:
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plot.get_yAxis()->set_drawMinorGrid(true);
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// usually axis ticks are shown as numbers 0.01, 0.1, 1, 10, ... You can also force the scientific
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// power-of-10 notation, using:
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plot.get_yAxis()->set_labelType(JKQTPCALTexponent);
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// the number of digits in JKQTPCALTexponent determines which labels are drawn in standard-notation,
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// as compared to power-notation (e.g. if set to 1, the labels 0.1=10^{-1}, 1, 10 are shown in
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// standard notation, the rest in power-notation. This tweak improves readability)
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plot.get_yAxis()->set_labelDigits(0);
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// minor tick labels are usually not displayed, but you can switch them on, using
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//plot.get_yAxis()->set_minorTickLabelsEnabled(true);
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// the axis font sizes can be set with:
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plot.get_yAxis()->set_tickLabelFontSize(10); // axis tick labels
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plot.get_yAxis()->set_minorTickLabelFontSize(7); // minor axis tick labels
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plot.get_yAxis()->set_labelFontSize(14); // axis label size
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plot.get_xAxis()->set_tickLabelFontSize(10); // axis tick labels
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plot.get_xAxis()->set_minorTickLabelFontSize(7); // minor axis tick labels
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plot.get_xAxis()->set_labelFontSize(14); // axis label size
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// ... and finally set axis labels (using LaTeX notation and $...$ to improve rendering)
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plot.get_yAxis()->set_axisLabel("Amplitude $A/A_{stat}$");
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plot.get_xAxis()->set_axisLabel("relative driving frequency $\\eta=\\omega/\\omega_0$");
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// 6. autoscale the plot so the graph is contained
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plot.zoomToFit();
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// 7. show plotter and make it a decent size
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plot.show();
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plot.resize(700,500);
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return app.exec();
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}
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