tweaks to pinch/zoom

assets/www/app.js

@@ -77,24 +77,28 @@ function onDeviceReady()
 	l10n.initLanguages();
 	if (window.plugins.pinchZoom !== undefined) {
 		// TODO: only enable this while on the map view?
-		window.plugins.pinchZoom.addEventListener('pinchzoom', function(event) {
-			if (event.type == "pinchzoomend") {
-				// TODO: zoom when we cross thresholds?
+		(function() {
+			var origDistance;
+			window.plugins.pinchZoom.addEventListener('pinchzoom', function(event) {
 				if (geo.map) {
-					console.log(JSON.stringify(event));
-					var ratio = event.distance / event.startDistance;
-					if (ratio < 0.5) {
-						// zoom out
-						console.log("ZOOM OUT");
-						geo.map.zoomOut();
-					} else if (ratio > 1.5) {
-						// zoom in
-						console.log("ZOOM IN");
-						geo.map.zoomIn();
+					if (event.type == "pinchzoomstart") {
+						origDistance = event.distance;
+					}
+					else if (event.type == "pinchzoommove" || event.type == "pinchzoomend") {
+						var ratio = event.distance / origDistance;
+						if (ratio < 0.67) {
+							// Zooming out
+							origDistance = event.distance;
+							geo.map.zoomOut();
+						} else if (ratio > 1.5) {
+							// Zooming in
+							origDistance = event.distance;
+							geo.map.zoomIn();
+						}
 					}
 				}
-			}
-		});
+			});
+		})();
 	}
 }