fix zoom (more precision)

Author: loudoweb

parallax/Parallax.hx

@@ -138,8 +138,8 @@ class Parallax
 
 		camera.onZoom(delta);
 
-		this.zoomOffsetX = zoomOffsetX;
-		this.zoomOffsetY = zoomOffsetY;
+		this.zoomOffsetX = (zoomOffsetX + camera.x) / camera.preZoom;
+		this.zoomOffsetY = (zoomOffsetY + camera.y) / camera.preZoom;
 
 		applyZoom();
 
@@ -155,7 +155,7 @@ class Parallax
 
 			var offsetX = zoomOffsetX * camera.preZoom - zoomOffsetX * camera.zoom;
 			var offsetY = zoomOffsetY * camera.preZoom - zoomOffsetY * camera.zoom;
-			
+
 			camera.x -= offsetX;
 			camera.y -= offsetY;
 		}

sample/OpenflSample.hx

@@ -69,8 +69,11 @@ class OpenflSample extends Sprite
 				OpenflHelper.setWorldBounds(parallax, layer, spr);
 			}
 		}
-
+		#if (gs || gs2)
+		parallax.setZoomBounds(1080);
+		#else
 		parallax.setZoomBounds(stage.stageHeight);
+		#end	
 
 		stage.addEventListener(MouseEvent.MOUSE_WHEEL, onWheel);
 		stage.addEventListener(MouseEvent.MOUSE_DOWN, onDragStart);
@@ -82,8 +85,11 @@ class OpenflSample extends Sprite
 	{
 		parallax.camera.width = stage.stageWidth;
 		parallax.camera.height = stage.stageHeight;
-
+		#if (gs || gs2)
+		parallax.setZoomBounds(1080);
+		#else
 		parallax.setZoomBounds(stage.stageHeight);
+		#end
 	}
 
 	function onReset(e:MouseEvent):Void
@@ -141,7 +147,7 @@ class OpenflSample extends Sprite
 
 	function onWheel(e:MouseEvent):Void
 	{
-		parallax.onZoom(e.delta / 100, e.stageX + parallax.camera.x, e.stageY + parallax.camera.y);
+		parallax.onZoom(e.delta / 100, e.stageX, e.stageY);
 
 		for (i in 0...containers.length)
 		{