mirror of
https://github.com/jkriege2/JKQtPlotter.git
synced 2024-12-25 10:01:38 +08:00
0e2237e92f
- fixed JKQTPColumnMathImage with modifiers - improved documentation - make use of link_prl/create_prl in QMake projects (see http://doc.qt.io/qt-5/qmake-advanced-usage.html)
105 lines
5.4 KiB
Markdown
105 lines
5.4 KiB
Markdown
# Example (JKQTPlotter): Laying out Several Plots {#JKQTPlotterMultiPlotLayout}
|
|
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.
|
|
|
|
The source code of the main application can be found in [`test_multiplot.cpp`](../test_multiplot/test_multiplot.cpp).
|
|
|
|
First three plots are generated and put into a [QGridLayout](http://doc.qt.io/qt-5/qgridlayout.html):
|
|
|
|
```.cpp
|
|
// 1. create a widget
|
|
QWidget mainWidget;
|
|
mainWidget.setWindowTitle("JKQTPlotter(s) in a QGridLayout");
|
|
|
|
// 2. Create a QGridLayout for the plots and add it to the widget.
|
|
QGridLayout* layout=new QGridLayout();
|
|
mainWidget.setLayout(layout);
|
|
|
|
// 3.1 create a main plotter widget and add it to the layout
|
|
JKQTPlotter* plotMain=new JKQTPlotter(&mainWidget);
|
|
layout->addWidget(plotMain, 0,0);
|
|
JKQTPDatastore* ds=plotMain->getDatastore();
|
|
|
|
// 3.2 create a second and third plotter widget and add them to the
|
|
// layout below and at the bottom right of the plotMain.
|
|
// Also configure it to use the same datastore as plotMain
|
|
JKQTPlotter* plotResid=new JKQTPlotter(false, &mainWidget, ds);
|
|
layout->addWidget(plotResid, 1,0);
|
|
JKQTPlotter* plotResidHist=new JKQTPlotter(false, &mainWidget, ds);
|
|
layout->addWidget(plotResidHist, 1,1);
|
|
|
|
// 3.3 set relative sizes of the plots via the layout (small plots have 1/3 the width and height of the large plot
|
|
layout->setRowStretch(0,3);
|
|
layout->setRowStretch(1,1);
|
|
layout->setColumnStretch(0,3);
|
|
layout->setColumnStretch(1,1);
|
|
```
|
|
|
|
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:
|
|
|
|
```.cpp
|
|
// 3.4 synchronize width/x-axis of plotResid to width/x-axis of plotMain
|
|
plotResid->getPlotter()->synchronizeToMaster(plotMain->getPlotter(), true, false, true, true);
|
|
|
|
// 3.5 synchronize y-axis of width/plotResidHist to y-axis of width/plotResid
|
|
plotResidHist->getPlotter()->synchronizeToMaster(plotResid->getPlotter(), false, true, true, true);
|
|
```
|
|
|
|
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:
|
|
|
|
```.cpp
|
|
// 3.6 ensure that the plot are printed/exported in whole, when printing in plotMain
|
|
plotMain->getPlotter()->setGridPrinting(true);
|
|
plotMain->getPlotter()->addGridPrintingPlotter(0,1,plotResid->getPlotter());
|
|
plotMain->getPlotter()->addGridPrintingPlotter(1,1,plotResidHist->getPlotter());
|
|
```
|
|
|
|
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`.
|
|
|
|
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.
|
|
|
|
Finally the axes and plots need a bit of formatting to make them look nicer:
|
|
|
|
```.cpp
|
|
// 6.1 axis labels, distributed over the several plots
|
|
plotMain->getYAxis()->setAxisLabel("y axis");
|
|
plotResid->getXAxis()->setAxisLabel("x axis");
|
|
plotResid->getYAxis()->setAxisLabel("residuals");
|
|
plotResidHist->getXAxis()->setAxisLabel("frequency");
|
|
// 6.2 switch off the tick labels on the axes that directly face another plot
|
|
plotMain->getXAxis()->setDrawMode1(JKQTPCADMticks);
|
|
plotResidHist->getYAxis()->setDrawMode1(JKQTPCADMticks);
|
|
// 6.3 show tick labels on the rhs y-axis of the residual histogram plot
|
|
plotResidHist->getYAxis()->setDrawMode2(JKQTPCADMticksAndLabels);
|
|
// 6.4 hide keys in all plots but the main plot
|
|
plotResid->getPlotter()->setShowKey(false);
|
|
plotResidHist->getPlotter()->setShowKey(false);
|
|
// 6.5 hide position label and toolbars in the plots except main plot
|
|
plotResid->setToolbarVisible(false);
|
|
plotResid->setMousePositionShown(false);
|
|
plotResidHist->setToolbarVisible(false);
|
|
plotResidHist->setMousePositionShown(false);
|
|
plotMain->setToolbarVisible(true);
|
|
```
|
|
|
|
As a last step, the axes are scaled automatically, so the data fills the plots:
|
|
|
|
```.cpp
|
|
// 7. scale plots automatically to data
|
|
plotResid->zoomToFit();
|
|
plotResidHist->zoomToFit();
|
|
plotMain->zoomToFit();
|
|
```
|
|
|
|
The result looks like this:
|
|
|
|
|
|
|
|
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:
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|