Programming GPS and OpenStreetMap Applications with Java

60 5. From Geography to Cartography

Creating the scales as visual components opens the option to place them

inside a Swing Container and draw them.

With these conversion methods, any GPS position can be converted to

spatial coordinates. The next “hook” (a way for customizing the handling

of some event or process) to Swing is the method that actually paints the

component:

protected void paintComponent(Graphics g)

Figure 5.1. An overview of the roafx.gui.map package to build a minimum ROAF

GUI front end. The drawing of geographical coordinates and map primitives

takes place in the MapPanel. The transformation from decimal (geographical)

coordinates to