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package tim.prune.gui;
import tim.prune.gui.map.MapCanvas;
import tim.prune.gui.map.MapPosition;
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 the GetGpsies 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 coordinate bounds of current viewport
*/
public double[] getBounds()
{
int width = _mapCanvas.getWidth();
int height = _mapCanvas.getHeight();
MapPosition mapPosition = _mapCanvas.getMapPosition();
double minLat = MapUtils.getLatitudeFromY(mapPosition.getYFromPixels(height, height));
double maxLat = MapUtils.getLatitudeFromY(mapPosition.getYFromPixels(0, height));
double minLon = MapUtils.getLongitudeFromX(mapPosition.getXFromPixels(0, width));
double maxLon = MapUtils.getLongitudeFromX(mapPosition.getXFromPixels(width, width));
return new double[] {minLat, minLon, maxLat, maxLon};
}
}
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