mirror of
https://github.com/jkriege2/JKQtPlotter.git
synced 2024-11-15 18:15:52 +08:00
55 lines
1.7 KiB
C++
55 lines
1.7 KiB
C++
/** \example jkqtplotter_simpletest.cpp
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* A very basic example for the usage of JKQTPlotter
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*
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* \ref JKQTPlotterSimpleTest
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*/
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#include <QApplication>
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#include "jkqtplotter/jkqtplotter.h"
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#include "jkqtplotter/graphs/jkqtpscatter.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 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)
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QVector<double> X, Y;
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const int Ndata=100;
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for (int i=0; i<Ndata; i++) {
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const double x=double(i)/double(Ndata)*8.0*JKQTPSTATISTICS_PI;
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X<<x;
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Y<<sin(x);
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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), so you can
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// reuse X and Y afterwards!
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// the variables columnX and columnY will contain the internal column ID of the newly
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// created columns with names "x" and "y" and the (copied) data from X and Y.
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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 graph in the plot, which plots the dataset X/Y:
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JKQTPXYLineGraph* graph1=new JKQTPXYLineGraph(&plot);
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graph1->setXColumn(columnX);
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graph1->setYColumn(columnY);
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graph1->setTitle(QObject::tr("sine graph"));
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// 5. add the graph to the plot, so it is actually displayed
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plot.addGraph(graph1);
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// 6. 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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