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112 lines
5.8 KiB
Markdown
112 lines
5.8 KiB
Markdown
# Example (JKQTPlotter): Simple stacked barchart {#JKQTPlotterStackedBarChart}
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This project (see `./examples/stackedbars/`) simply creates a JKQTPlotter widget (as a new window) and adds several stacked barcharts.
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The source code of the main application is (see [`stackedbars.cpp`](https://github.com/jkriege2/JKQtPlotter/tree/master/examples/stackedbars/stackedbars.cpp):
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```.cpp
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#include <QApplication>
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#include "jkqtplotter/jkqtplotter.h"
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#include "jkqtplotter/graphs/jkqtpbarchart.h"
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#define Ndata 5
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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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plot.getPlotter()->setUseAntiAliasingForGraphs(true); // nicer (but slower) plotting
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plot.getPlotter()->setUseAntiAliasingForSystem(true); // nicer (but slower) plotting
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plot.getPlotter()->setUseAntiAliasingForText(true); // nicer (but slower) text rendering
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JKQTPDatastore* ds=plot.getDatastore();
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// 2. now we create data for the charts (taken from https://commons.wikimedia.org/wiki/File:Energiemix_Deutschland.svg)
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QVector<double> year, percentage_other, percentage_coaloil, percentage_gas, percentage_nuclear, percentage_green;
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year << 1990 << 1995 << 2000 << 2005 << 2010 << 2015;
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percentage_other << 3.5 << 3.5 << 4.4 << 4.4 << 5 << 5 ;
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percentage_coaloil << 58.7 << 55.7 << 51.5 << 48.2 << 42.9 << 43.1;
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percentage_gas << 6.5 << 7.7 << 8.5 << 11.7 << 14.1 << 9.6 ;
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percentage_nuclear << 27.7 << 28.7 << 29.4 << 26.2 << 22.2 << 14.2;
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percentage_green << 3.6 << 4.4 << 6.2 << 9.5 << 15.8 << 28.1;
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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)
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// the variables cYear, cOther ... will contain the internal column ID of the
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// newly created columns with names "year" and "other" ... and the (copied) data
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size_t cYear=ds->addCopiedColumn(year, "year");
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size_t cOther=ds->addCopiedColumn(percentage_other, "other");
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size_t cCoalOil=ds->addCopiedColumn(percentage_coaloil, "coal & oil");
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size_t cGas=ds->addCopiedColumn(percentage_gas, "natural gas");
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size_t cNuclear=ds->addCopiedColumn(percentage_nuclear, "nuclear energy");
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size_t cGreen=ds->addCopiedColumn(percentage_green, "green energy");
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// 4. create graphs in the plot, which plots the dataset year/other, year/coal, ...
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// The color of the graphs is set by calling setFillColor_and_darkenedColor(), which sets the
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// fillColor to the given color and makes the outline of the bars (i.e. their "color") a darker
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// shade of the given color.
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QVector<JKQTPBarVerticalStackableGraph*> graphs;
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graphs.push_back(new JKQTPBarVerticalStackableGraph(&plot));
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graphs.back()->setXColumn(cYear);
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graphs.back()->setYColumn(cOther);
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graphs.back()->setTitle(QObject::tr("other sources"));
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graphs.back()->setFillColor_and_darkenedColor(QColor("red"));
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graphs.push_back(new JKQTPBarVerticalStackableGraph(&plot));
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graphs.back()->setXColumn(cYear);
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graphs.back()->setYColumn(cCoalOil);
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graphs.back()->setTitle(QObject::tr("coal & oil"));
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graphs.back()->setFillColor_and_darkenedColor(QColor("darkgrey"));
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graphs.back()->stackUpon(graphs[graphs.size()-2]);
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graphs.push_back(new JKQTPBarVerticalStackableGraph(&plot));
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graphs.back()->setXColumn(cYear);
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graphs.back()->setYColumn(cGas);
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graphs.back()->setTitle(QObject::tr("natural gas"));
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graphs.back()->setFillColor_and_darkenedColor(QColor("blue"));
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graphs.back()->stackUpon(graphs[graphs.size()-2]);
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graphs.push_back(new JKQTPBarVerticalStackableGraph(&plot));
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graphs.back()->setXColumn(cYear);
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graphs.back()->setYColumn(cNuclear);
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graphs.back()->setTitle(QObject::tr("nuclear energy"));
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graphs.back()->setFillColor_and_darkenedColor(QColor("gold"));
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graphs.back()->stackUpon(graphs[graphs.size()-2]);
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graphs.push_back(new JKQTPBarVerticalStackableGraph(&plot));
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graphs.back()->setXColumn(cYear);
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graphs.back()->setYColumn(cGreen);
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graphs.back()->setTitle(QObject::tr("green energy"));
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graphs.back()->setFillColor_and_darkenedColor(QColor("darkgreen"));
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graphs.back()->stackUpon(graphs[graphs.size()-2]);
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// 5. add the graphs to the plot, so it is actually displayed
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plot.addGraphs(graphs);
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// 6. set axis labels
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plot.getXAxis()->setAxisLabel("year");
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plot.getYAxis()->setAxisLabel("fraction of energy production in Germany [%]");
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// 7. finally we move the plot key/legend to the outside, top-right
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// and lay it out as a single row
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// NOTE: plot is a descendent of QWidget, which uses an internal object of
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// type JKQTBasePlotter, which does the actual plotting.
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// So many properties of the plot are only available in this internal
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// object, which you can access by plot.getPlotter().
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plot.getPlotter()->setKeyPosition(JKQTPKeyOutsideTopRight);
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plot.getPlotter()->setKeyLayout(JKQTPKeyLayoutOneRow);
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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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```
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The result looks like this:
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If you use `JKQTPBarHorizontalGraphStacked` instead of `JKQTPBarVerticalStackableGraph`, you'll get a result like this:
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