partial-offset

Calculates a partial width for the snip, starting from the first snip item and continuing for a given number of items. The drawing context and snip's position in editor coordinates are provided. See also get-extent.

The snip's editor is usually internally locked for writing and reflowing when this method is called (see also Locks).

• (send a-snip partial-offset dc x y len) -> real number
      dc : dc<%> object
      x : real number
      y : real number
      len : exact non-negative integer

  Calculates a partial width for the snip, starting from the first snip item and continuing for len items.