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94 lines
3.2 KiB
C++
94 lines
3.2 KiB
C++
/** \example jkqtplotter_simpletest_parametriccurve.cpp
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* Shows how to plot parametric curves from datapoints with JKQtPlotter
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*
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* \ref JKQtPlotterParametricCurves
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*/
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#include <QApplication>
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#include "jkqtplotter/jkqtplotter.h"
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#include "jkqtplotter/jkqtpgraphs.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 two plotter windows that share the same internal datastore (for convenience)
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JKQtPlotter plot, plot2;
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JKQTPdatastore* ds=plot.getDatastore();
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plot2.useExternalDatastore(ds);
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// 2. now we create a vector of x- and y-values of the logarithmic spiral
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// in addition the radius is stored in column R
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QVector<double> X, Y, R;
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const int Ndata=500; // number of plot points in each curve
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const double phiMax=4.0*M_PI;
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const double a=1;
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const double k=0.2;
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for (double phi=-phiMax; phi<=phiMax; phi+=phiMax/double(Ndata)) {
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const double x=a*exp(k*phi)*cos(phi);
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const double y=a*exp(k*phi)*sin(phi);
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X<<x;
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Y<<y;
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R<<sqrt(x*x+y*y);
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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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size_t columnY=ds->addCopiedColumn(Y, "y");
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size_t columnR=ds->addCopiedColumn(R, "r");
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// 3. now we make several graphs. In each one, another property of the graph is controlled by
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// a datacolumn
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// 3.1 the basic graph
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JKQTPxyLineGraph* graph1=new JKQTPxyLineGraph(&plot);
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graph1->set_xColumn(columnX);
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graph1->set_yColumn(columnY);
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graph1->set_drawLine(true);
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graph1->set_symbol(JKQTPnoSymbol);
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graph1->set_title("one-colored spiral");
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plot.addGraph(graph1);
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// 3.2 for graph2 is the same as graph 1, but in addition, the color of the lines
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// is set, based on the contents of column R, via the color-palette JKQTPMathImageMATLAB
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JKQTPxyParametrizedScatterGraph* graph2=new JKQTPxyParametrizedScatterGraph(&plot2);
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graph2->set_xColumn(columnX);
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graph2->set_yColumn(columnY);
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graph2->set_colorColumn(columnR);
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graph2->set_palette(JKQTPMathImageMATLAB);
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graph2->set_symbol(JKQTPnoSymbol);
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graph2->set_drawLine(true);
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graph2->set_title("colored spiral");
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graph2->get_colorBarRightAxis()->set_axisLabel("color scale radius $r(\\phi)$");
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plot2.addGraph(graph2);
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// 4. set the axis scale aspect ratios to 1,
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// autoscale the plot so the graph is contained
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// and format the coordinate system and key
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plot.get_plotter()->set_maintainAspectRatio(true);
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plot.get_plotter()->set_aspectRatio(1);
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plot.get_xAxis()->set_axisLabel("x-axis");
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plot.get_yAxis()->set_axisLabel("y-axis");
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plot.get_xAxis()->set_drawGrid(false);
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plot.get_yAxis()->set_drawGrid(false);
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plot.setXY(-15,15,-15,15);
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plot2.get_plotter()->set_maintainAspectRatio(true);
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plot2.get_plotter()->set_aspectRatio(1);
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plot2.get_xAxis()->set_axisLabel("x-axis");
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plot2.get_yAxis()->set_axisLabel("y-axis");
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plot2.get_xAxis()->set_drawGrid(false);
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plot2.get_yAxis()->set_drawGrid(false);
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plot2.setXY(-15,15,-15,15);
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// 5. show plotters and make them a decent size
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plot.show();
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plot.resize(600,600);
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plot2.show();
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plot2.resize(600,600);
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return app.exec();
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}
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