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101 lines
4.6 KiB
Markdown
101 lines
4.6 KiB
Markdown
[Back to JKQTPlotter main page](https://github.com/jkriege2/JKQtPlotter/)
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# JKQtPlotter
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## Simple barchart
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This project (see [`simpletest_barchart`](https://github.com/jkriege2/JKQtPlotter/blob/master/examples/simpletest_barchart) simply creates a JKQtPlotter widget (as a new window) and adds several barcharts. They are ordered in groups.
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The soruce code of the main application is (see [`jkqtplotter_simpletest_barchart.cpp`](https://github.com/jkriege2/JKQtPlotter/blob/master/examples/simpletest_barchart/jkqtplotter_simpletest_barchart.cpp):
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```c++
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#include <QApplication>
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#include "jkqtplotter/jkqtplotter.h"
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#include "jkqtplotter/jkqtpgraphsbarchart.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.get_plotter()->set_useAntiAliasingForGraphs(true); // nicer (but slower) plotting
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plot.get_plotter()->set_useAntiAliasingForSystem(true); // nicer (but slower) plotting
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plot.get_plotter()->set_useAntiAliasingForText(true); // nicer (but slower) text rendering
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JKQTPdatastore* ds=plot.getDatastore();
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// 2. now we create data for three simple barchart
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QString L[Ndata]={ "cat. A", "cat. B", "cat. C", "cat. D", "other"};
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double X[Ndata]={ 1, 2, 3, 4, 5};
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double Y1[Ndata]={ 5, 4, 3, 4, 5};
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double Y2[Ndata]={ -5, -3, 1, 3, 6};
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double Y3[Ndata]={ 6, 2, 5, 3, 6};
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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 columnX and columnY... will contain the internal column ID of the
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// newly created columns with names "x" and "y..." and the (copied) data from X
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// and Y...
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size_t columnX=ds->addCopiedColumn(X, Ndata, "x");
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size_t columnY1=ds->addCopiedColumn(Y1, Ndata, "y1");
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size_t columnY2=ds->addCopiedColumn(Y2, Ndata, "y2");
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size_t columnY3=ds->addCopiedColumn(Y3, Ndata, "y3");
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// 4. create graphs in the plot, which plots the dataset X/Y1, X/Y2 and X/Y3:
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JKQTPbarVerticalGraph* graph1=new JKQTPbarVerticalGraph(&plot);
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graph1->set_xColumn(columnX);
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graph1->set_yColumn(columnY1);
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graph1->set_title(QObject::tr("dataset 1"));
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JKQTPbarVerticalGraph* graph2=new JKQTPbarVerticalGraph(&plot);
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graph2->set_xColumn(columnX);
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graph2->set_yColumn(columnY2);
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graph2->set_title(QObject::tr("dataset 2"));
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JKQTPbarVerticalGraph* graph3=new JKQTPbarVerticalGraph(&plot);
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graph3->set_xColumn(columnX);
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graph3->set_yColumn(columnY3);
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graph3->set_title(QObject::tr("dataset 3"));
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// 5. add the graphs to the plot, so it is actually displayed
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plot.addGraph(graph1);
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plot.addGraph(graph2);
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plot.addGraph(graph3);
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// 6. now we set the graphs, so they are plotted side-by-side
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// This function searches all JKQTPbarVerticalGraph in the current
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// plot and sets their shift/scale so they form a nice plot with
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// side-by-side groups
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graph1->autoscaleBarWidthAndShift(0.75, 1);
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// 7. data is grouped into 5 numbere groups (1..5), but we also have string
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// labels for these groups (stored in L). In order to display these labels,
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// we have to tell the x-Axis to use these special labels:
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plot.get_xAxis()->addAxisTickLabels(X, L, Ndata);
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// also we can rotate the labels a bit (by 45 degree), so they fit better
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plot.get_xAxis()->set_tickLabelAngle(45);
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plot.get_xAxis()->set_tickLabelFontSize(12);
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// 8. 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.get_plotter().
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plot.get_plotter()->set_keyPosition(JKQTPkeyOutsideTopRight);
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plot.get_plotter()->set_keyLayout(JKQTPkeyLayoutOneRow);
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// 9 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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[Back to JKQTPlotter main page](https://github.com/jkriege2/JKQtPlotter/) |