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105 lines
5.5 KiB
Markdown
105 lines
5.5 KiB
Markdown
# JKQtPlotter: Examples: Laying out Several Plots {#JKQtPlotterMultiPlotLayout}
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This project (see `./examples/test_multiplot/`) shows how several JKQtPlotter widgets can be combined to in a layout (based on the [Qt layouting system](http://doc.qt.io/qt-5/layout.html)). It also shows how axes in such a layout can be linked to improve user experience.
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The source code of the main application can be found in [`test_multiplot.cpp`](../test_multiplot/test_multiplot.cpp).
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First three plots are generated and put into a [QGridLayout](http://doc.qt.io/qt-5/qgridlayout.html):
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```c++
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// 1. create a widget
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QWidget mainWidget;
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mainWidget.setWindowTitle("JKQtPlotter(s) in a QGridLayout");
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// 2. Create a QGridLayout for the plots and add it to the widget.
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QGridLayout* layout=new QGridLayout();
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mainWidget.setLayout(layout);
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// 3.1 create a main plotter widget and add it to the layout
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JKQtPlotter* plotMain=new JKQtPlotter(&mainWidget);
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layout->addWidget(plotMain, 0,0);
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JKQTPdatastore* ds=plotMain->getDatastore();
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// 3.2 create a second and third plotter widget and add them to the
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// layout below and at the bottom right of the plotMain.
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// Also configure it to use the same datastore as plotMain
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JKQtPlotter* plotResid=new JKQtPlotter(false, &mainWidget, ds);
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layout->addWidget(plotResid, 1,0);
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JKQtPlotter* plotResidHist=new JKQtPlotter(false, &mainWidget, ds);
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layout->addWidget(plotResidHist, 1,1);
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// 3.3 set relative sizes of the plots via the layout (small plots have 1/3 the width and height of the large plot
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layout->setRowStretch(0,3);
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layout->setRowStretch(1,1);
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layout->setColumnStretch(0,3);
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layout->setColumnStretch(1,1);
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```
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With this simple setup, all three plots would be arranged by the QLayout, but they were all independent. This example could be part of a data fitting application, where the main plot shows data and a fit curve. A plot below that will display the residulas (errors) of the fit. Now if a user zooms one of the plots, he would expect that athe x-axes of the two plots are synchronized. The same for a third plot on the rhs of the residuals, which will show a residual histogram. This linking of the axes can be achieved by the following code:
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```c++
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// 3.4 synchronize width/x-axis of plotResid to width/x-axis of plotMain
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plotResid->get_plotter()->synchronizeToMaster(plotMain->get_plotter(), true, false, true, true);
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// 3.5 synchronize y-axis of width/plotResidHist to y-axis of width/plotResid
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plotResidHist->get_plotter()->synchronizeToMaster(plotResid->get_plotter(), false, true, true, true);
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```
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Finally: When printing or saving an image of the plots, the plotter will no know anything about the arrangement of the plots and the plots cannot be printed/drawn in the same arrangement as in the window. If you want to arrange the plots in the same layout in a printout, as in the window, you will have to tell the main plot, in which arrangement to print the plots:
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```c++
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// 3.6 ensure that the plot are printed/exported in whole, when printing in plotMain
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plotMain->get_plotter()->set_gridPrinting(true);
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plotMain->get_plotter()->addGridPrintingPlotter(0,1,plotResid->get_plotter());
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plotMain->get_plotter()->addGridPrintingPlotter(1,1,plotResidHist->get_plotter());
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```
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In the first line, grid-printing (i.e. the layouted printing of several graphs) is activated. Then the arrangement of the two slave plots `plotResid` and `plotResidHist` is defined as (`x,y`)-shifts with respect to the master plot `plotMain`.
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Now some data is generated and several curves are added to the graphs. See [`test_multiplot.cpp`](../test_multiplot/test_multiplot.cpp) for the full source code.
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Finally the axes and plots need a bit of formatting to make them look nicer:
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```c++
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// 6.1 axis labels, distributed over the several plots
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plotMain->get_yAxis()->set_axisLabel("y axis");
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plotResid->get_xAxis()->set_axisLabel("x axis");
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plotResid->get_yAxis()->set_axisLabel("residuals");
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plotResidHist->get_xAxis()->set_axisLabel("frequency");
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// 6.2 switch off the tick labels on the axes that directly face another plot
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plotMain->get_xAxis()->set_drawMode1(JKQTPCADMticks);
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plotResidHist->get_yAxis()->set_drawMode1(JKQTPCADMticks);
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// 6.3 show tick labels on the rhs y-axis of the residual histogram plot
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plotResidHist->get_yAxis()->set_drawMode2(JKQTPCADMticksAndLabels);
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// 6.4 hide keys in all plots but the main plot
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plotResid->get_plotter()->set_showKey(false);
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plotResidHist->get_plotter()->set_showKey(false);
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// 6.5 hide position label and toolbars in the plots except main plot
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plotResid->set_displayToolbar(false);
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plotResid->set_displayMousePosition(false);
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plotResidHist->set_displayToolbar(false);
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plotResidHist->set_displayMousePosition(false);
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plotMain->set_toolbarAlwaysOn(true);
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```
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As a last step, the axes are scaled automatically, so the data fills the plots:
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```c++
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// 7. scale plots automatically to data
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plotResid->zoomToFit();
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plotResidHist->zoomToFit();
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plotMain->zoomToFit();
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```
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The result looks like this:
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You push the print button () to open a print preview dialog, which will give an impression of how the three plots will be arranged in a printout:
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