The `main()`-function can be found in [`test_styling_main.cpp`](https://github.com/jkriege2/JKQtPlotter/tree/master/examples/test_styling/test_styling_main.cpp). Here the Qt application is initialized in the usual way and the main window `win` is created and shown. After instanciating the `QApplication`, but befor instanciating the window (and thus the JKQTPlotter), you can already alter the system-wide default styling. It is accessible via the function `JKQTPGetSystemDefaultStyle()`, which returns a reference to the central style object of type `JKQTPlotterStyle`. In the example below, the color of the user-actions (e.g. of the zooming rectangle, that can be drawn with the mouse) is set to red:
```.cpp
int main(int argc, char* argv[])
{
QApplication app(argc, argv);
// you can set the system-wide default style properties early on
// all JKQTPlotter instance created after this, will use these
In addition to `JKQTPGetSystemDefaultStyle()`, which allows to style the `JKQTPlotter` (mainly the GUI-parts and user-action bindings), there is also `JKQTPGetSystemDefaultBaseStyle()`, which accesses a central instance of `JKQTBasePlotterStyle`. The latter object contains the styling of the graph itself (colors, axis properties, ...).
You can also store these settings in an INI-file (or any file supported by [`QSettings`](http://doc.qt.io/qt-5/qsettings.html)) and load such a file on startup, using:
The major part of the source code of the main application can be found in [`test_styling.cpp`](https://github.com/jkriege2/JKQtPlotter/tree/master/examples/test_styling/test_styling.cpp). It opens a window with a plotter, that contains a set of test graphs to demonstrate the styling. The following function is connected to the "Update Graph"-button and applys the style defined by the INI in the plainTextEdit to the plotter:
