Zoom in / Zoom out enhancement

[zanollim]

Zoom in and Zoom out work only if you drag a box with the mouse on the map. It is better if Zoom in and Zoom out work also with a simple click with the mouse.
For example:

• Zoom in --> click on the map --> zoom in 2x centered on the point clicked
• Zoom out --> click on the map --> zoom out 2x centered on the point clicked

[martinl]

 http://trac.osgeo.org/grass/changeset/29846

User can zoom in/out by:

• dragging a box with the mouse
• simple click (centered on the point click) <- now implemented
• scrolling mouse wheel (also centered)

[cmbarton]

In fact you CAN zoom in and out with a single click in both the TclTk? GUI and wxPython GUI. Try it. Pick the zoom in or zoom out tool and click the map.

Michael