mirror of
https://github.com/jkriege2/JKQtPlotter.git
synced 2024-11-16 02:25:50 +08:00
9debaae7fe
added example for impulse plots
56 lines
1.8 KiB
C++
56 lines
1.8 KiB
C++
#include <QApplication>
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#include "jkqtplotter/jkqtplotter.h"
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#include "jkqtplotter/jkqtpimpulseselements.h"
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// number of datapoints:
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#define Ndata 40
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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 for a simple plot (a sine curve with lin. increasing errors)
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QVector<double> X, Y;
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for (int i=0; i<Ndata; i++) {
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const double xx=double(i)/double(Ndata)*6.0*M_PI;
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X << xx;
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Y << cos(xx)*exp(-xx/10.0);
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}
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// 3. add data from vectors to the datastore
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size_t columnX=ds->addCopiedColumn(X, "x");
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size_t columnY=ds->addCopiedColumn(Y, "y");
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// 4. create a vertical impulse graph in the plot, which plots the dataset X/Y:
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JKQTPimpulsesVerticalGraph* graph=new JKQTPimpulsesVerticalGraph(&plot);
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graph->set_xColumn(columnX);
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graph->set_yColumn(columnY);
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graph->set_lineWidth(2);
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graph->set_color(QColor("red"));
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graph->set_title(QObject::tr("$\\cos(x)\\cdot\\exp(-x/10)$"));
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// 5. add the graph to the plot, so it is actually displayed
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plot.addGraph(graph);
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// 6. set some axis properties (we use LaTeX for nice equation rendering)
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plot.getXAxis()->set_axisLabel(QObject::tr("x-axis"));
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plot.getYAxis()->set_axisLabel(QObject::tr("y-axis"));
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// 7. switch the grid off
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plot.getXAxis()->set_drawGrid(false);
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plot.getYAxis()->set_drawGrid(false);
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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(600,400);
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return app.exec();
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}
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