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package tim.prune.gui;
import tim.prune.gui.map.MapCanvas;
import tim.prune.gui.map.MapUtils;
/**
* Class to provide access to current viewport
* The point of this class is to decouple the view from the MapCanvas object
* so that when a search function needs to know the area currently viewed, it doesn't
* need to have a direct connection to the MapCanvas. Instead it asks the App for the viewport,
* which is then able to get the map position from the MapCanvas.
* I'm still not sure whether this is ugly or not, but it's more efficient than constantly listening.
*/
public class Viewport
{
/** Map canvas object */
private MapCanvas _mapCanvas = null;
/**
* Constructor
* @param inCanvas map canvas object
*/
public Viewport(MapCanvas inCanvas)
{
_mapCanvas = inCanvas;
}
/**
* @return latitude at centre of viewport
*/
public double getCentreLatitude()
{
final double minLat = MapUtils.getLatitudeFromY(_mapCanvas.getMinYValue());
final double maxLat = MapUtils.getLatitudeFromY(_mapCanvas.getMaxYValue());
return (minLat + maxLat) / 2.0;
}
/**
* @return longitude at centre of viewport
*/
public double getCentreLongitude()
{
final double minLon = MapUtils.getLongitudeFromX(_mapCanvas.getMinXValue());
double maxLon = MapUtils.getLongitudeFromX(_mapCanvas.getMaxXValue());
if (maxLon < minLon) {
maxLon += 360.0;
}
double result = (minLon + maxLon) / 2.0;
if (result > 360.0) {
result -= 360.0;
}
return result;
}
}
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