mirror of
https://github.com/jkriege2/JKQtPlotter.git
synced 2024-11-16 02:25:50 +08:00
94 lines
3.7 KiB
C++
94 lines
3.7 KiB
C++
#include <QApplication>
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#include <cmath>
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#include "jkqtplotter/jkqtplotter.h"
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#include "jkqtplotter/jkqtpimageelements.h"
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#ifndef M_PI
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#define M_PI 3.14159265358979323846
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#endif
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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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JKQtPlotter plot;
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// 1. create a plotter window and get a pointer to the internal datastore (for convenience)
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plot.get_plotter()->set_useAntiAliasingForGraphs(true); // nicer (but slower) plotting
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plot.get_plotter()->set_useAntiAliasingForSystem(true); // nicer (but slower) plotting
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plot.get_plotter()->set_useAntiAliasingForText(true); // nicer (but slower) text rendering
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JKQTPdatastore* ds=plot.getDatastore();
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// 2. now we create data for the charts (taken from https://commons.wikimedia.org/wiki/File:Energiemix_Deutschland.svg)
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const int NX=100; // image dimension in x-direction [pixels]
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const int NY=100; // image dimension in x-direction [pixels]
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const double dx=1e-2; // size of a pixel in x-direction [micrometers]
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const double dy=1e-2; // size of a pixel in x-direction [micrometers]
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const double w=static_cast<double>(NX)*dx;
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const double h=static_cast<double>(NY)*dy;
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double airydisk[NX*NY]; // row-major image
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// 2.1 Parameters for airy disk plot (see https://en.wikipedia.org/wiki/Airy_disk)
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double NA=1.1; // numerical aperture of lens
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double wavelength=488e-3; // wavelength of the light [micrometers]
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// 2.2 calculate image of airy disk in a row-major array
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double x, y=-h/2.0;
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for (int iy=0; iy<NY; iy++ ) {
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x=-w/2.0;
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for (int ix=0; ix<NX; ix++ ) {
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const double r=sqrt(x*x+y*y);
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const double v=2.0*M_PI*NA*r/wavelength;
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airydisk[iy*NX+ix] = pow(2.0*j1(v)/v, 2);
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x+=dx;
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}
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y+=dy;
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}
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// 3. make data available to JKQtPlotter by adding it to the internal datastore.
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// Note: In this step the data is copied (of not specified otherwise)
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// the variables cYear, cOther ... will contain the internal column ID of the
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// newly created columns with names "year" and "other" ... and the (copied) data
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size_t cAiryDisk=ds->addCopiedImageAsColumn(airydisk, NX, NY, "imagedata");
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// 4. create graphs in the plot, which plots the dataset year/other, year/coal, ...
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// The color of the graphs is set by calling set_fillColor_and_darkenedColor(), which sets the
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// fillColor to the given color and makes the outline of the bars (i.e. their "color") a darker
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// shade of the given color.
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JKQTPColumnMathImage* graph=new JKQTPColumnMathImage(&plot);
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graph->set_title("");
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graph->set_imageColumn(cAiryDisk);
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graph->set_Nx(NX);
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graph->set_Ny(NY);
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graph->set_x(-w/2.0);
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graph->set_y(-h/2.0);
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graph->set_width(w);
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graph->set_height(h);
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graph->set_palette(JKQTPMathImageMATLAB); // color-map is "MATLAB"
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graph->get_colorBarRightAxis()->set_axisLabel("light intensity [A.U.]"); // get coordinate axis of color-bar and set its label
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// 5. add the graphs to the plot, so it is actually displayed
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plot.addGraph(graph);
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// 6. set axis labels
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plot.get_xAxis()->set_axisLabel("x [{\\mu}m]");
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plot.get_yAxis()->set_axisLabel("y [{\\mu}m]");
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// 7. fix axis and plot aspect ratio to 1
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plot.get_plotter()->set_maintainAspectRatio(true);
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plot.get_plotter()->set_maintainAxisAspectRatio(true);
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// 8 autoscale the plot so the graph is contained
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plot.zoomToFit();
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// show plotter and make it a decent size
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plot.show();
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plot.resize(600,600);
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plot.setWindowTitle("JKQTPColumnMathImage");
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return app.exec();
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}
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