Translations:Development/Tutorials/Physical Simulation/29/en

The KXmlGuiWindow allows us fancy application. The Qtimer is required for the motion of the ball and the KPlotWidget shows us the graph of the data. This main window is a child of the KXmlGuiWindow. and has a constructor with a default value of 0, which implies it is the main window. We also add one QWidget, which will allow us to position multiple things on the main window. Also we add already the KPlotWidget, since this widget is debugged and working nicely.