fix for #2

SoftwareBrothers · Feb 10, 2015 · 1559eec · 1559eec
1 parent 31e3f72
commit 1559eec
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Showing 2 changed files with 11 additions and 9 deletions.
diff --git a/dist/fabricjs_viewport.js b/dist/fabricjs_viewport.js
diff --git a/src/fabric/viewport.coffee b/src/fabric/viewport.coffee
@@ -27,10 +27,11 @@ class fabric.Viewport
     @zoom = newZoom
 
   _adjustPositionAfterZoom: (newZoom) ->
-    width = @canvas.width
-    height = @canvas.height
-    @position.x += ((@zoom * width) - (newZoom * width)) / 2;
-    @position.y += ((@zoom * height) - (newZoom * height)) / 2;
+    halfWidth = @canvas.width / 2
+    halfHeight = @canvas.height / 2
+    k = newZoom / @zoom
+    @position.x = halfWidth - k * (halfWidth - @position.x)
+    @position.y = halfHeight - k * (halfHeight - @position.y)
 
   translate: () ->
     {