X-Git-Url: http://gitweb.fperrin.net/?p=GpsPrune.git;a=blobdiff_plain;f=src%2Ftim%2Fprune%2Fgui%2FViewport.java;fp=src%2Ftim%2Fprune%2Fgui%2FViewport.java;h=25eba2fb1847306d41aed63021c7cbe3e4ed2cf0;hp=0000000000000000000000000000000000000000;hb=ce6f2161b8596f7018d6a76bff79bc9e571f35fd;hpb=2d8cb72e84d5cc1089ce77baf1e34ea3ea2f8465

diff --git a/src/tim/prune/gui/Viewport.java b/src/tim/prune/gui/Viewport.java
new file mode 100644
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+++ b/src/tim/prune/gui/Viewport.java
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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};
+	}
+}