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133 lines
5.4 KiB
Markdown
133 lines
5.4 KiB
Markdown
# Example (JKQTPlotter): Styling different aspects of boxplots {#JKQTPlotterBoxplotStyling}
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This project (see [`test_styledboxplot`](https://github.com/jkriege2/JKQtPlotter/tree/master/examples/test_styledboxplot) demonstrates how to style different aspects of boxplots and how to draw different types and styles of boxplots. For a simple introduction into how to use boxplots, see [Plotting Box Plots](https://github.com/jkriege2/JKQtPlotter/tree/master/examples/boxplot) and [Plotting a Statistical Distribution of Data](https://github.com/jkriege2/JKQtPlotter/tree/master/examples/test_distributionplot).
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[JKQTPlotterBasicJKQTPDatastore]: @ref JKQTPlotterBasicJKQTPDatastore "Basic Usage of JKQTPDatastore"
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[JKQTPlotterBasicJKQTPDatastoreIterators]: @ref JKQTPlotterBasicJKQTPDatastoreIterators "Iterator-Based usage of JKQTPDatastore"
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[JKQTPlotterBasicJKQTPDatastoreStatistics]: @ref JKQTPlotterBasicJKQTPDatastoreStatistics "Advanced 1-Dimensional Statistics with JKQTPDatastore"
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[JKQTPlotterBasicJKQTPDatastoreRegression]: @ref JKQTPlotterBasicJKQTPDatastoreRegression "Regression Analysis (with the Statistics Library)"
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[JKQTPlotterBasicJKQTPDatastoreStatistics2D]: @ref JKQTPlotterBasicJKQTPDatastoreStatistics2D "Advanced 2-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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[JKQTPlotterBoxplotsGraphs]: @ref JKQTPlotterBoxplotsGraphs "Boxplots"
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***Note*** that this example explains how to style boxplots. The example [JKQTPlotterBoxplotsGraphs] explains basics of how to create boxplots. The internal [statisticslibrary] offers methods to calculate the statistical properties necessary for boxplots, which is explained in the tutorial [JKQTPlotterBasicJKQTPDatastoreStatistics] in detail.
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The link http://vita.had.co.nz/papers/boxplots.pdf leads to a paper that described the history and different types of boxplots.
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The source code of the main application can be found in [`test_styledboxplot.cpp`](test_styledboxplot.cpp).
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The major parts that are concerned with the styling are:
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```.cpp
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// 2. create a basic boxplot
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plot.addGraph(graphBoxPlot=new JKQTPBoxplotVerticalElement(&plot));
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plot.addGraph(new JKQTPGeoText(&plot, x-dx/2.0, y0+9, "\\textbf{\\begin{matrix}basic boxplot\\\\\"Turkey's style\"\\end{matrix}}", 8, QColor("black")));
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graphBoxPlot->setPos(x);
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graphBoxPlot->setMin(y0+1);
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graphBoxPlot->setPercentile25(y0+2.5);
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graphBoxPlot->setMedian(y0+4);
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graphBoxPlot->setPercentile75(y0+5.5);
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graphBoxPlot->setMax(y0+8);
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// set color of all elements
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graphBoxPlot->setBoxplotColor(QColor("black"),QColor("white"), plot.getPlotter());
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// ...
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// ...
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// 3. create a basic boxplot with mean as symbol
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// ...
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// set mean value to show mean symbol
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graphBoxPlot->setMean(y0+3.5);
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graphBoxPlot->setDrawMean(true);
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graphBoxPlot->setMeanMode(JKQTPGraphBoxplotStyleMixin::MeanAsSymbol);
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graphBoxPlot->setMeanColor(QColor("darkgreen"));
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graphBoxPlot->setMeanSymbolType(JKQTPFilledTriangle);
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// ...
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// ...
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// 4. create a basic boxplot with mean as line
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// ...
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// set mean value to show mean symbol
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graphBoxPlot->setMean(y0+3.5);
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graphBoxPlot->setDrawMean(true);
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graphBoxPlot->setMeanMode(JKQTPGraphBoxplotStyleMixin::MeanAsLine);
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graphBoxPlot->setMeanColor(QColor("darkgreen"));
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graphBoxPlot->setMeanLineStyle(Qt::DashLine);
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graphBoxPlot->setMeanLineWidth(2);
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// ...
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// ...
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// 5. create a notched boxplot
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// ...
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// for a notched plot, you need to set the confidence interval
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graphBoxPlot->setMedianConfidenceIntervalWidth(1);
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graphBoxPlot->setDrawNotch(true);
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graphBoxPlot->setRelativeNotchIndent(y0+0.5);
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// ...
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// ...
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// 6. create a notched boxplot
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// ...
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// restyle as Tufte's box-less
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graphBoxPlot->setDrawBox(false);
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// ...
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// ...
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// 7. style box
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// ...
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// style box line&fill
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graphBoxPlot->setLineColor(QColor("red"));
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graphBoxPlot->setLineStyle(Qt::DotLine);
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graphBoxPlot->setLineWidth(1);
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graphBoxPlot->setFillColor(QColor("yellow"));
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// ...
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// ...
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// 8. fancy style box
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// ...
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// style box fill
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QLinearGradient linearGrad(QPointF(0, 0), QPointF(1, 1));
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QColor c1(Qt::red);
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QColor c2(Qt::yellow);
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QColor c3(Qt::blue);
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linearGrad.setColorAt(0, c1);
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linearGrad.setColorAt(0.3, c2);
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linearGrad.setColorAt(1, c3);
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// use this CoordinateMode, so the gradient fills the whole graph area
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linearGrad.setCoordinateMode(QGradient::ObjectBoundingMode);
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graphBoxPlot->setFillGradient(linearGrad);
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// ...
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// ...
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// 9. style median
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// ...
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// style box line
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graphBoxPlot->setMedianLineColor(QColor("red"));
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graphBoxPlot->setMedianLineWidth(3);
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// ...
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// ...
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// 10. style whiskers&caps
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// ...
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// style box line
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graphBoxPlot->setWhiskerLineColor(QColor("red"));
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graphBoxPlot->setWhiskerLineStyle(Qt::DotLine);
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graphBoxPlot->setWhiskerLineWidth(1);
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graphBoxPlot->setWhiskerCapLineColor(QColor("blue"));
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graphBoxPlot->setWhiskerCapLineStyle(Qt::SolidLine);
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graphBoxPlot->setWhiskerCapLineWidth(4);
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graphBoxPlot->setRelativeWhiskerWidth(0.9);
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```
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The result looks like this:
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