JKQtPlotter/examples/simpletest_stackedbars/jkqtplotter_simpletest_stackedbars.cpp

/** \example jkqtplotter_simpletest_stackedbars.cpp
 * JKQTPlotter: Examples: Simple stacked barchart
 *
 * \ref JKQTPlotterStackedBarChart
 */

#include <QApplication>
#include "jkqtplotter/jkqtplotter.h"
#include "jkqtplotter/jkqtpgraphs.h"
#include "jkqtplotter/jkqtpgraphsbarchart.h"


template<class TGRAPH>
void addGraph(JKQTPlotter& plot, bool swapXY) {
    // 1. create a plotter window and get a pointer to the internal datastore (for convenience)
    plot.getPlotter()->setUseAntiAliasingForGraphs(true); // nicer (but slower) plotting
    plot.getPlotter()->setUseAntiAliasingForSystem(true); // nicer (but slower) plotting
    plot.getPlotter()->setUseAntiAliasingForText(true); // nicer (but slower) text rendering
    JKQTPDatastore* ds=plot.getDatastore();

    // 2. now we create data for the charts (taken from https://commons.wikimedia.org/wiki/File:Energiemix_Deutschland.svg)
    QVector<double> year, percentage_other, percentage_coaloil, percentage_gas, percentage_nuclear, percentage_green;
    year                << 1990     << 1995     << 2000     << 2005     << 2010     << 2015;
    percentage_other    << 3.5      << 3.5      << 4.4      << 4.4      << 5        << 5   ;
    percentage_coaloil  << 58.7     << 55.7     << 51.5     << 48.2     << 42.9     << 43.1;
    percentage_gas      << 6.5      << 7.7      << 8.5      << 11.7     << 14.1     << 9.6 ;
    percentage_nuclear  << 27.7     << 28.7     << 29.4     << 26.2     << 22.2     << 14.2;
    percentage_green    << 3.6      << 4.4      << 6.2      << 9.5      << 15.8     << 28.1;


    // 3. make data available to JKQTPlotter by adding it to the internal datastore.
    //    Note: In this step the data is copied (of not specified otherwise)
    //    the variables cYear, cOther ... will contain the internal column ID of the
    //    newly created columns with names "year" and "other" ... and the (copied) data
    size_t cYear=ds->addCopiedColumn(year, "year");
    size_t cOther=ds->addCopiedColumn(percentage_other, "other");
    size_t cCoalOil=ds->addCopiedColumn(percentage_coaloil, "coal & oil");
    size_t cGas=ds->addCopiedColumn(percentage_gas, "natural gas");
    size_t cNuclear=ds->addCopiedColumn(percentage_nuclear, "nuclear energy");
    size_t cGreen=ds->addCopiedColumn(percentage_green, "green energy");

    // 4. create graphs in the plot, which plots the dataset year/other, year/coal, ...
    //    The color of the graphs is set by calling setFillColor_and_darkenedColor(), which sets the
    //    fillColor to the given color and makes the outline of the bars (i.e. their "color") a darker
    //    shade of the given color.
    QVector<TGRAPH*> graphs;
    graphs.push_back(new TGRAPH(&plot));
    graphs.back()->setXColumn((!swapXY)?cYear:cOther);
    graphs.back()->setYColumn((!swapXY)?cOther:cYear);
    graphs.back()->setTitle(QObject::tr("other sources"));
    graphs.back()->setFillColor_and_darkenedColor(QColor("red"));
    graphs.push_back(new TGRAPH(&plot));
    graphs.back()->setXColumn((!swapXY)?cYear:cCoalOil);
    graphs.back()->setYColumn((!swapXY)?cCoalOil:cYear);
    graphs.back()->setTitle(QObject::tr("coal & oil"));
    graphs.back()->setFillColor_and_darkenedColor(QColor("darkgrey"));
    graphs.back()->stackUpon(graphs[graphs.size()-2]);
    graphs.push_back(new TGRAPH(&plot));
    graphs.back()->setXColumn((!swapXY)?cYear:cGas);
    graphs.back()->setYColumn((!swapXY)?cGas:cYear);
    graphs.back()->setTitle(QObject::tr("natural gas"));
    graphs.back()->setFillColor_and_darkenedColor(QColor("blue"));
    graphs.back()->stackUpon(graphs[graphs.size()-2]);
    graphs.push_back(new TGRAPH(&plot));
    graphs.back()->setXColumn((!swapXY)?cYear:cNuclear);
    graphs.back()->setYColumn((!swapXY)?cNuclear:cYear);
    graphs.back()->setTitle(QObject::tr("nuclear energy"));
    graphs.back()->setFillColor_and_darkenedColor(QColor("gold"));
    graphs.back()->stackUpon(graphs[graphs.size()-2]);
    graphs.push_back(new TGRAPH(&plot));
    graphs.back()->setXColumn((!swapXY)?cYear:cGreen);
    graphs.back()->setYColumn((!swapXY)?cGreen:cYear);
    graphs.back()->setTitle(QObject::tr("green energy"));
    graphs.back()->setFillColor_and_darkenedColor(QColor("darkgreen"));
    graphs.back()->stackUpon(graphs[graphs.size()-2]);


    // 5. add the graphs to the plot, so it is actually displayed
    plot.addGraphs(graphs);

    // 6. set axis labels
    plot.getXAxis()->setAxisLabel("year");
    plot.getYAxis()->setAxisLabel("fraction of energy production in Germany [%]");

    // 7. finally we move the plot key/legend to the outside, top-right
    //    and lay it out as a single row
    //    NOTE: plot is a descendent of QWidget, which uses an internal object of
    //          type JKQTBasePlotter, which does the actual plotting.
    //          So many properties of the plot are only available in this internal
    //          object, which you can access by plot.getPlotter().
    plot.getPlotter()->setKeyPosition(JKQTPKeyOutsideTopRight);
    plot.getPlotter()->setKeyLayout(JKQTPKeyLayoutOneRow);

    // 8 autoscale the plot so the graph is contained
    plot.zoomToFit();

    // show plotter and make it a decent size
    plot.show();
    plot.resize(600,400);
}


int main(int argc, char* argv[])
{
    QApplication app(argc, argv);

    JKQTPlotter plotV;
    addGraph<JKQTPBarVerticalStackableGraph>(plotV, false);
    plotV.setWindowTitle("JKQTPBarVerticalStackableGraph");

    JKQTPlotter plotH;
    addGraph<JKQTPBarHorizontalStackableGraph>(plotH, true);
    plotH.setWindowTitle("JKQTPBarHorizontalStackableGraph");

    plotV.move(100,100);
    plotH.move(750,100);

    return app.exec();
}