JKQtPlotter/examples/scatter/scatter.cpp

142 lines
4.7 KiB
C++

/** \example scatter.cpp
* A very basic example for the usage of JKQTPScatterGraphh
*
* \ref JKQTPlotterscatter
*/
#include "jkqtpexampleapplication.h"
#include <QApplication>
#include "jkqtplotter/jkqtplotter.h"
#include "jkqtplotter/graphs/jkqtpscatter.h"
#include "jkqtpexampleapplication.h"
#include <random>
void createScatterGraph(JKQTPlotter&plot) {
JKQTPDatastore* ds=plot.getDatastore();
// 2. add two columns to the JKQTPDatastore and obtain back-inserter iterators for these
size_t columnX=ds->addColumn("x");
auto colXInserter=ds->backInserter(columnX);
size_t columnY=ds->addColumn("y");
auto colYInserter=ds->backInserter(columnY);
// 3. now we create data for a simple plot (a sine curve with random noise)
std::default_random_engine generator(123);
std::normal_distribution<double> distribution(0,0.5);
const int Ndata=100;
for (int i=0; i<Ndata; i++) {
// put data
const double x=double(i)/double(Ndata)*8.0*JKQTPSTATISTICS_PI;
*colXInserter=x;
*colYInserter=sin(x)+distribution(generator);
// advance back-inserters
colXInserter++;
colYInserter++;
}
// 4. create a graph in the plot, which plots the dataset X/Y:
JKQTPXYScatterGraph* graph1=new JKQTPXYScatterGraph(&plot);
graph1->setXColumn(columnX);
graph1->setYColumn(columnY);
graph1->setTitle(QObject::tr("sine graph"));
// 5. add the graph to the plot, so it is actually displayed
plot.addGraph(graph1);
// 6. autoscale the plot so the graph is contained
plot.zoomToFit();
// show plotter and make it a decent size
plot.getPlotter()->setPlotLabel(QObject::tr("Scatter Example"));
plot.show();
plot.resize(600/plot.devicePixelRatioF(),400/plot.devicePixelRatioF());
}
void createErrorScatterGraph(JKQTPlotter&plot) {
JKQTPDatastore* ds=plot.getDatastore();
// 2. add two columns to the JKQTPDatastore and obtain back-inserter iterators for these
size_t columnX=ds->addColumn("x");
auto colXInserter=ds->backInserter(columnX);
size_t columnY=ds->addColumn("y");
auto colYInserter=ds->backInserter(columnY);
size_t columnY2=ds->addColumn("y2");
auto colY2Inserter=ds->backInserter(columnY2);
size_t columnEX=ds->addColumn("xerr");
auto colEXInserter=ds->backInserter(columnEX);
size_t columnEY=ds->addColumn("yerr");
auto colEYInserter=ds->backInserter(columnEY);
// 3. now we create data for a simple plot (a sine curve with random noise)
std::default_random_engine generator(123);
std::normal_distribution<double> distribution(0,0.5);
const int Ndata=15;
for (int i=0; i<Ndata; i++) {
// put data
const double x=double(i)/double(Ndata)*8.0*JKQTPSTATISTICS_PI;
*colXInserter=x;
*colYInserter=sin(x)+2.0;
*colY2Inserter=cos(x)-2.0;
*colEXInserter=distribution(generator);
*colEYInserter=distribution(generator);
// advance back-inserters
colXInserter++;
colYInserter++;
colY2Inserter++;
colEXInserter++;
colEYInserter++;
}
// 4. create a graph in the plot, which plots the dataset X/Y:
JKQTPXYScatterErrorGraph* graph1=new JKQTPXYScatterErrorGraph(&plot);
graph1->setXColumn(columnX);
graph1->setYColumn(columnY);
graph1->setYErrorColumn(columnEY);
graph1->setYErrorStyle(JKQTPErrorSimpleBars);
graph1->setSymbolType(JKQTPCross);
graph1->setTitle(QObject::tr("y-errorlines"));
plot.addGraph(graph1);
JKQTPXYScatterErrorGraph* graph2=new JKQTPXYScatterErrorGraph(&plot);
graph2->setXColumn(columnX);
graph2->setYColumn(columnY2);
graph2->setXErrorColumn(columnEX);
graph2->setYErrorColumn(columnEY);
graph2->setXErrorStyle(JKQTPErrorBars);
graph2->setYErrorStyle(JKQTPErrorBars);
graph2->setTitle(QObject::tr("xy-errorbars"));
graph2->setSymbolLineWidth(3);
plot.addGraph(graph2);
// 6. autoscale the plot so the graph is contained
plot.zoomToFit();
// show plotter and make it a decent size
plot.getPlotter()->setPlotLabel(QObject::tr("Error Scatter Example"));
plot.setGrid(false);
plot.show();
plot.resize(600/plot.devicePixelRatioF(),400/plot.devicePixelRatioF());
}
int main(int argc, char* argv[])
{
JKQTPAppSettingController highDPIController(argc,argv);
JKQTPExampleApplication app(argc, argv);
// 1. create a plotter window and get a pointer to the internal datastore (for convenience)
JKQTPlotter plot, plotErr;
createScatterGraph(plot);
plot.setWindowTitle("1: JKQTPXYScatterGraph");
createErrorScatterGraph(plotErr);
plotErr.setWindowTitle("2: JKQTPXYScatterErrorGraph");
return app.exec();
}