BigCard zooming

client/scripts/20-comp-BigCard.coffee

@@ -24,10 +24,17 @@ Crafty.c 'BigCard',
         h: @target._h
         alpha: 0.5
       }
+      @origin 'center'
       return
 
     # transition into zoom version
     Enlarge: ->
+      # set new origin on finished animation
+      @one 'TweenEnd', ->
+        @origin 'center'
+        return
+
+      # start animation
       @tween {
         x: bcConf.x
         y: bcConf.y
@@ -39,13 +46,12 @@ Crafty.c 'BigCard',
 
     # fade out and destroy
     Fade: ->
-
       # remove this on finished animation
       @one 'TweenEnd', ->
         @destroy()
         return
 
-      # transition back to attributes of target card
+      # transition back to target card
       @tween {
         x: @target._x
         y: @target._y
@@ -61,7 +67,7 @@ Crafty.c 'BigCard',
         when Crafty.mouseButtons.RIGHT
           @trigger 'Fade'
         when Crafty.mouseButtons.MIDDLE
-          # reset intermediate config, then re-zoom this
+          # reset intermediate config, then reset zoom
           bcConf = Crafty.clone CONF.bigcard
           @trigger 'Enlarge'
       return
@@ -69,16 +75,30 @@ Crafty.c 'BigCard',
     # zoom in and out
     MouseWheelScroll: (e) ->
       if e.target == @
+        # save origin
+        origin =
+          x: @ox
+          y: @oy
+
         # new attributes
         @attr {
           w: @_w * (1 + e.direction * 0.1)
           h: @_h * (1 + e.direction * 0.1)
         }
+        @origin 'center'
+
+        # restore origin
+        @attr {
+          ox: origin.x
+          oy: origin.y
+        }
+
         # update intermediate config
+        bcConf.x = @_x
+        bcConf.y = @_y
         bcConf.w = @_w
         bcConf.h = @_h
       return
-      return
 
     StopDrag: ->
       # update intermediate config