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106 lines
4.9 KiB
Markdown
106 lines
4.9 KiB
Markdown
# Example (JKQTPlotter): Boxplots {#JKQTPlotterBoxplotsGraphs}
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This project (see [`boxplot`](https://github.com/jkriege2/JKQtPlotter/tree/master/examples/boxplot) demonstrates how to use JKQTPlotter to draw <a href="https://en.wikipedia.org/wiki/Box_plot">box plots</a> using the classes `JKQTPBoxplotVerticalGraph` and `JKQTPBoxplotHorizontalGraph`.
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[JKQTPlotterBasicJKQTPDatastoreStatistics]: @ref JKQTPlotterBasicJKQTPDatastoreStatistics "Advanced 1-Dimensional Statistics with JKQTPDatastore"
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[statisticslibrary]: @ref jkqtptools_math_statistics "JKQTPlotter Statistics Library"
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[JKQTPlotterBoxplotStyling]: @ref JKQTPlotterBoxplotStyling "Styling different aspects of boxplots"
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***Note*** that this example explains how to add boxplots to a graph by hand, i.e. by calculating all the statistical properties for the boxplots by hand. The internal [statisticslibrary] offers methods to perform these calculations, which are explained in the tutorial [JKQTPlotterBasicJKQTPDatastoreStatistics] in detail. Additional advanced styling of boxplots is covered by the example [JKQTPlotterBoxplotStyling].
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The source code of the main application is (see [`boxplot.cpp`](boxplot.cpp).
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After adding all necessary data to the JKQTDatastore:
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```.cpp
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// 2. now we create data for the boxplots
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QVector<double> POS, POSY, MEDIAN, MEAN, Q25, Q75, MIN, MAX;
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POS << 1 << 4 << 7 << 10;
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POSY << -1 << -2 << -3 << -4;
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MIN << 2 << 3 << 2.5 << 6;
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Q25 << 4 << 4.5 << 5 << 7;
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MEDIAN << 5 << 6 << 7 << 9;
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MEAN << 5.5 << 5.2 << 8 << 8;
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Q75 << 6 << 7 << 9 << 11;
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MAX << 8 << 7.5 << 11 << 12;
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// 3. make data available to JKQTPlotter by adding it to the internal datastore.
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size_t columnPOS=ds->addCopiedColumn(POS, "POS");
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size_t columnPOSY=ds->addCopiedColumn(POSY, "POSY");
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size_t columnMIN=ds->addCopiedColumn(MIN, "MIN");
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size_t columnQ25=ds->addCopiedColumn(Q25, "Q25");
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size_t columnMEDIAN=ds->addCopiedColumn(MEDIAN, "MEDIAN");
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size_t columnMEAN=ds->addCopiedColumn(MEAN, "MEAN");
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size_t columnQ75=ds->addCopiedColumn(Q75, "Q75");
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size_t columnMAX=ds->addCopiedColumn(MAX, "MAX");
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```
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... you can generate the JKQTPBoxplotVerticalGraph:
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```.cpp
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// 4. create a graph of vertical boxplots:
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JKQTPBoxplotVerticalGraph* graph=new JKQTPBoxplotVerticalGraph(&plot);
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graph->setPositionColumn(columnPOS);
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graph->setMinColumn(columnMIN);
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graph->setPercentile25Column(columnQ25);
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graph->setMedianColumn(columnMEDIAN);
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graph->setMeanColumn(columnMEAN);
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graph->setPercentile75Column(columnQ75);
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graph->setMaxColumn(columnMAX);
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graph->setTitle("vertical Boxplots");
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```
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You can further style the plot by e.g. setting:
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```.cpp
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// 6.1 make fill collor a lighter shade of the outline color
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graphh->setFillColor(graphh->getLineColor().lighter());
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// 6.2 make whiskers dashed
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graphh->setWhiskerLineStyle(Qt::DashLine);
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graphh->setWhiskerLineColor(graphh->getLineColor().darker());
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// 6.3 make whiskers caps solid and thick
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graphh->setWhiskerCapLineStyle(Qt::SolidLine);
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graphh->setWhiskerCapLineColor(graphh->getLineColor().darker());
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graphh->setWhiskerCapLineWidth(graphh->getLineWidth()*2.5);
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// 6.4 change mean symbol
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graphh->setMeanSymbolType(JKQTPFilledStar);
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graphh->setMeanFillColor(QColor("silver"));
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// 6.5 change median line color
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graphh->setMedianLineColor(QColor("darkgreen"));
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// 6.6 change box width to 75% of distance
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graphh->setBoxWidthRelative(0.75);
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```
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The result looks like this:
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In addition to the simple box plots, the image above also shows outliers as small circles. these need to be drawn with a separate `JKQTPXYLineGraph`:
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```.cpp
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// add some outliers (as (x,y)-pairs)
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QVector<double> OUTLIERSX, OUTLIERSY;
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OUTLIERSX << 4 << 4 << 4 << 4 << 4 << 10 << 10 << 10 << 10 << 10 << 10 << 10;
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OUTLIERSY << 1 << 0.5 << 1.3 << 8 << 8.1 << 5 << 4 << 12.2 << 13 << 12.5 << 13.5 << 13.1;
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// 3. make data available to JKQTPlotter by adding it to the internal datastore.
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...
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size_t columnOUTLIERSX=ds->addCopiedColumn(OUTLIERSX, "OUTLIERSX");
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size_t columnOUTLIERSY=ds->addCopiedColumn(OUTLIERSY, "OUTLIERSY");
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// 4. create a graph of vertical boxplots:
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...
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// 5. outliers need to be drawn separately
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JKQTPXYLineGraph* graphOutliers=new JKQTPXYLineGraph(&plot);
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graphOutliers->setXColumn(columnOUTLIERSX);
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graphOutliers->setYColumn(columnOUTLIERSY);
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graphOutliers->setTitle("outliers");
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// make the color a darker shade of the color of graph
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graphOutliers->setColor(graph->getColor().darker());
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graphOutliers->setFillColor(QColor("white"));
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// draw outliers as small circles, without lines
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graphOutliers->setSymbolType(JKQTPCircle);
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graphOutliers->setDrawLine(false);
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graphOutliers->setSymbolSize(7);
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```
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