The source code of the main application can be found in [`test_user_interaction.cpp`](https://github.com/jkriege2/JKQtPlotter/tree/master/examples/test_user_interaction/test_user_interaction.cpp).
The rest of the form contains several Qt widgets which switch diverse aspects of the plot style (log-axes, grid on/off ...) and allow to bind different actions to several defined events, e.g.
```.cpp
// add a QComboBox that allows to set the left mouse button action for the JKQTPlotter
cmbLeftNoModMouseAction=new QComboBox(this);
layForm->addRow("mouse action: left-click, no modifiers", cmbLeftNoModMouseAction);
As you can see, this QComboBox registers one of the available actions to the event of a left-button single mouse click without having modifiers pressed at the same time. The slot that actually reconfigures the JKQTPlotter uses the methods JKQTPlotter::deregisterMouseDragAction() and JKQTPlotter::registerMouseDragAction() to achieve this effect.
## Available User-Interactions
You can play around with this example to find out about different types of user interactions. SOm of them are illustrated with animations below.
### Switching Graph Visibility via Context Menu
the default context menu contains a sub-menu that allows to switch every graph and and off:
You can also use the checkboxes "enable toolbar" to disable this toolbar alltogether and "toolbar 'always on'" to switch the vanishing feature off and make it visible all the time.
You can move the viewport of the graph using the mouse ("jkqtpmdaPanPlotOnMove"-action). If you drag inside the plot window, you can move in both directions, if you drag over one of the coordinate axes, you can change the range of this axis only:
Again these actions are limited to a single axis, if the mouse is above that axis (and not inside the actual plot rectangle).
### Drawing Geometrical Forms
You can also use the mouse to draw various geometricals forms. When you finish drawing, a single event is emitted for that form, which contains its size and position:
