Added merge() to SVG.BBox

1 files changed, 35 insertions, 25 deletions

diff --git a/src/rbox.js b/src/rbox.js
index 02405b0..5eb474f 100644
--- a/src/rbox.js
+++ b/src/rbox.js
@@ -1,32 +1,42 @@
 // Get the rectangular box of a given element
 SVG.RBox = function(element) {
-  var box, zoom
-    , e = element.doc().parent
-    , zoom = element.doc().viewbox().zoom
-  
-  /* actual, native bounding box */
-  box = element.node.getBoundingClientRect()
-  
-  /* get screen offset */
-  this.x = box.left
-  this.y = box.top
-  
-  /* subtract parent offset */
-  this.x -= e.offsetLeft
-  this.y -= e.offsetTop
-  
-  while (e = e.offsetParent) {
+  var e, zoom
+    , box = {}
+
+  /* initialize zero box */
+  this.x      = 0
+  this.y      = 0
+  this.width  = 0
+  this.height = 0
+  
+  if (element) {
+    e = element.doc().parent
+    zoom = element.doc().viewbox().zoom
+    
+    /* actual, native bounding box */
+    box = element.node.getBoundingClientRect()
+    
+    /* get screen offset */
+    this.x = box.left
+    this.y = box.top
+    
+    /* subtract parent offset */
     this.x -= e.offsetLeft
     this.y -= e.offsetTop
-  }
-  
-  /* calculate cumulative zoom from svg documents */
-  e = element
-  while (e = e.parent) {
-    if (e.type == 'svg' && e.viewbox) {
-      zoom *= e.viewbox().zoom
-      this.x -= e.x() || 0
-      this.y -= e.y() || 0
+    
+    while (e = e.offsetParent) {
+      this.x -= e.offsetLeft
+      this.y -= e.offsetTop
+    }
+    
+    /* calculate cumulative zoom from svg documents */
+    e = element
+    while (e = e.parent) {
+      if (e.type == 'svg' && e.viewbox) {
+        zoom *= e.viewbox().zoom
+        this.x -= e.x() || 0
+        this.y -= e.y() || 0
+      }
     }
   }