JKQTPlotter trunk/v5.0.0
an extensive Qt5+Qt6 Plotter framework (including a feature-richt plotter widget, a speed-optimized, but limited variant and a LaTeX equation renderer!), written fully in C/C++ and without external dependencies
Loading...
Searching...
No Matches
Example (JKQTPlotter): Simple stacked barchart

This project (see ./examples/stackedbars/) simply creates a JKQTPlotter widget (as a new window) and adds several stacked barcharts.

The source code of the main application is (see stackedbars.cpp:

#include <QApplication>
#include "jkqtplotter/jkqtplotter.h"
#include "jkqtplotter/graphs/jkqtpbarchart.h"
#define Ndata 5
int main(int argc, char* argv[])
{
QApplication app(argc, argv);
// 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
// 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<JKQTPBarVerticalStackableGraph*> graphs;
graphs.push_back(new JKQTPBarVerticalStackableGraph(&plot));
graphs.back()->setXColumn(cYear);
graphs.back()->setYColumn(cOther);
graphs.back()->setTitle(QObject::tr("other sources"));
graphs.back()->setFillColor_and_darkenedColor(QColor("red"));
graphs.push_back(new JKQTPBarVerticalStackableGraph(&plot));
graphs.back()->setXColumn(cYear);
graphs.back()->setYColumn(cCoalOil);
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 JKQTPBarVerticalStackableGraph(&plot));
graphs.back()->setXColumn(cYear);
graphs.back()->setYColumn(cGas);
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 JKQTPBarVerticalStackableGraph(&plot));
graphs.back()->setXColumn(cYear);
graphs.back()->setYColumn(cNuclear);
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 JKQTPBarVerticalStackableGraph(&plot));
graphs.back()->setXColumn(cYear);
graphs.back()->setYColumn(cGreen);
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()->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);
return app.exec();
}
void setUseAntiAliasingForSystem(bool __value)
specifies whether to use antialiasing for plotting the coordinate system
void setUseAntiAliasingForGraphs(bool __value)
specifies whether to use antialiasing for plotting the graphs
void setKeyPosition(const JKQTPKeyPosition &__value)
key position inside or besides the plot area, see JKQTPKeyPositions for details and examples
void setUseAntiAliasingForText(bool __value)
specifies whether to use antialiasing when drawing any text
This implements a vertical bar graph with bars between and Optionally several graphs of this type m...
Definition jkqtpbarchart.h:268
void setAxisLabel(const QString &__value)
axis label of the axis
This class manages data columns (with entries of type double ), used by JKQTPlotter/JKQTBasePlotter t...
Definition jkqtpdatastorage.h:282
size_t addCopiedColumn(TIterator first, TIterator last, const QString &name=QString(""))
add one column to the datastore. It will be filled with the values from first ... last
Definition jkqtpdatastorage.h:871
plotter widget for scientific plots (uses JKQTBasePlotter to do the actual drawing)
Definition jkqtplotter.h:364
void zoomToFit(bool zoomX=true, bool zoomY=true, bool includeX0=false, bool includeY0=false, double scaleX=1.05, double scaleY=1.05)
this method zooms the graph so that all plotted datapoints are visible.
Definition jkqtplotter.h:1039
void addGraphs(const TJKQTPGraphContainer &gr, QVector< size_t > *graphIDsOut=nullptr)
add a new graphs from a QVector<JKQTPPlotElement*>, QList<JKQTPPlotElement*>, std::vector<JKQTPPlotEl...
Definition jkqtplotter.h:816
JKQTPVerticalAxisBase * getYAxis(JKQTPCoordinateAxisRef axis=JKQTPPrimaryAxis)
returns the y-axis objet of the plot
Definition jkqtplotter.h:713
JKQTBasePlotter * getPlotter()
returns the JKQTBasePlotter object internally used for plotting
Definition jkqtplotter.h:404
JKQTPDatastore * getDatastore()
returns a pointer to the datastore used by this object
Definition jkqtplotter.h:611
JKQTPHorizontalAxisBase * getXAxis(JKQTPCoordinateAxisRef axis=JKQTPPrimaryAxis)
returns the x-axis objet of the plot
Definition jkqtplotter.h:711
@ JKQTPKeyLayoutOneRow
the key consists of one row. This may overflow the available space, use JKQTPKeyLayoutMultiColumn or ...
Definition jkqtptools.h:637
@ JKQTPKeyOutsideTopRight
the key is positioned above the graph, on the right
Definition jkqtptools.h:557

The result looks like this:

JKQTPBarVerticalGraphStacked

If you use JKQTPBarHorizontalGraphStacked instead of JKQTPBarVerticalStackableGraph, you'll get a result like this: JKQTPBarHorizontalGraphStacked