Convert latitudinal and longitudinal coordinates

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The XYPoint object stores the initial coordinates and changes to converted coordinates.

Import the following classes:
- net.rim.device.api.lbs.MapField
- javax.microedition.location.Coordinates
- net.rim.device.api.ui.XYPoint
To convert latitudinal and longitudinal coordinates to pixels, invoke MapField.convertWorldToField(Coordinates worldIn, XYPoint fieldOut) or MapField.convertWorldToField(XYPoint worldIn, XYPoint fieldOut).
```
MapField myMapField = new MapField();
myMapField.convertWorldToField(coordinatesToConvert, xyptCartPlain);
```
To convert pixels to latitudinal and longitudinal coordinates, invoke MapField.convertFieldToWorld(XYPoint fieldIn, Coordinates worldOut) or MapField.convertFieldToWorld(XYPoint fieldIn, XYPoint worldOut).
```
MapField myMapField = new MapField();
myMapField.convertFieldToWorld(xyptCartPlainToConvert, coordinates);
```

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