         , true)
       @add_dependencies('inner_range_vertical', this, ['border_bottom', 'inner_height'])
 
-    # transform screen coordinates to underlying device coordinates
+    # transform view coordinates to underlying screen coordinates
     vx_to_sx: (x) ->
       return x
     vy_to_sy: (y) ->
       return @get('canvas_height') - y
 
-    # vectorized versions of xpos/ypos, these are mutating, in-place operations
+    # vectorized versions of vx_to_sx/vy_to_sy, these are mutating, in-place operations
     v_vx_to_sx: (xx) ->
       for x, idx in xx
         xx[idx] = x

    v_sy_to_vy: (yy) ->
      canvas_height = @get('canvas_height')
      for y, idx in yy
        yy[idx] = y - canvas_height
      return yy

        yy[idx] = canvas_height - y
      return yy

    # transform underlying screen coordinates to view coordinates
    sx_to_vx: (x) ->
      return x
    sy_to_vy: (y) ->
      return @get('canvas_height') - y

    # vectorized versions of sx_to_vx/sy_to_vy, these are mutating, in-place operations
    v_sx_to_vx: (xx) ->
      for x, idx in xx
        xx[idx] = x
