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48 lines
1.9 KiB
Markdown
48 lines
1.9 KiB
Markdown
# Example (JKQTPlotter): Barchart With Functor Fill-Mode {#JKQTPlotterBarchartsFunctorFilling}
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This project (see [`barchart_functorfill`](https://github.com/jkriege2/JKQtPlotter/tree/master/examples/barchart_functorfill) shows how to draw barcharts, where the bars are filled differently, as defined by a custom functor.
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The source code of the main application is (see [`barchart_functorfill.cpp`](https://github.com/jkriege2/JKQtPlotter/tree/master/examples/barchart_functorfill/barchart_functorfill.cpp):
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```.cpp
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// 1. create a plotter window and get a pointer to the internal datastore (for convenience)
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JKQTPDatastore* ds=plot.getDatastore();
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// 2. now we create two columns for key and value
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size_t columnK=ds->addLinearColumn(11, 0, 10, "k");
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size_t columnV=ds->addColumnCalculatedFromColumn(columnK, [](double x) { return 5.0+x; }, "v");
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// 3. create graph in the plot, which plots the dataset:
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JKQTPBarVerticalGraph* graph=new JKQTPBarVerticalGraph(&plot);
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graph->setKeyColumn(columnK);
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graph->setValueColumn(columnV);
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// set FunctorFilling fill Mode
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graph->setFillMode(JKQTPBarGraphBase::FillMode::FunctorFilling);
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// define filling functor
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graph->setFillBrushFunctor(
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[](double key, double value) {
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return QBrush(QColor::fromHsvF(key/12.0, 1.0, 1.0));
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}
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);
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plot.addGraph(graph);
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// 4 autoscale the plot so the graph is contained
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plot.zoomToFit();
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// 5. show plotter and make it a decent size
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plot.setWindowTitle(title);
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plot.show();
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plot.resize(400,400);
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```
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The result looks like this:
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In order to draw horizontal error bars, you have to use `JKQTPBarHorizontalGraph` instead of `JKQTPBarVerticalGraph`:
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