Point Screen To World Hit test now works with multiple cameras and camera transforms

Author: bitnenfer

v3/src/camera/Camera.js

@@ -304,7 +304,7 @@ var Camera = new Class({
         return this;  
     },
 
-    transformPoint: function (pointIn, pointOut)
+    cameraToScreen: function (pointIn, pointOut)
     {
         var cameraMatrix = this.matrix.matrix;
         var mva = cameraMatrix[0];
@@ -313,16 +313,33 @@ var Camera = new Class({
         var mvd = cameraMatrix[3];
         var mve = cameraMatrix[4];
         var mvf = cameraMatrix[5];
+        
+        /* First Invert Matrix */
+        var determinant = (mva * mvd) - (mvb * mvc);
+
+        if (!determinant)
+            return pointIn;
+
+        determinant = 1 / determinant;
+
+        var ima = mvd * determinant;
+        var imb = -mvb * determinant;
+        var imc = -mvc * determinant;
+        var imd = mva * determinant;
+        var ime = (mvc * mvf - mvd * mve) * determinant;
+        var imf = (mvb * mve - mva * mvf) * determinant;
+
         var x = pointIn.x;
         var y = pointIn.y;
 
         if (!pointOut)
         {
             pointOut = {x: 0, y: 0};
         }
-
-        pointOut.x = (x * mva + y * mvc + mve);
-        pointOut.y = (x * mvb + y * mvd + mvf);
+        
+        /* Apply transform to point */
+        pointOut.x = (x * ima + y * imc + ime);
+        pointOut.y = (x * imb + y * imd + imf);
 
         return pointOut;
     },

v3/src/input/components/PointScreenToWorldHitTest.js

@@ -8,7 +8,7 @@ var PointScreenToWorldHitTest = function (tempMatrix, x, y, gameObjectArray, cam
     var scrollY = camera.scrollY;
     var cameraW = camera.width;
     var cameraH = camera.height;
-
+    var screenPoint = camera.cameraToScreen({x: x, y: y});
     output.length = 0;
 
     if (gameObjectArray instanceof Array)
@@ -19,7 +19,7 @@ var PointScreenToWorldHitTest = function (tempMatrix, x, y, gameObjectArray, cam
         for (var index = 0; index < culledLength; ++index)
         {
             var object = culled[index];
-            var tpoint = GetTransformedPoint(tempMatrix, object, x + scrollX * object.scrollFactorX, y + scrollY * object.scrollFactorY);
+            var tpoint = GetTransformedPoint(tempMatrix, object, screenPoint.x + scrollX * object.scrollFactorX, screenPoint.y + scrollY * object.scrollFactorY);
 
             if (PointWithinGameObject(object, tpoint.x, tpoint.y))
             {