1 files changed, 43 insertions, 0 deletions
diff --git a/src/rbox.js b/src/rbox.js
new file mode 100644
index 0000000..02405b0
--- /dev/null
+++ b/src/rbox.js
@@ -0,0 +1,43 @@
+// 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) {
+    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
+    }
+  }
+  
+  /* recalculate viewbox distortion */
+  this.x /= zoom
+  this.y /= zoom
+  this.width  = box.width  /= zoom
+  this.height = box.height /= zoom
+  
+  /* add the center */
+  this.cx = this.x + this.width  / 2
+  this.cy = this.y + this.height / 2
+  
+}
+\ No newline at end of file