set-stipple

Sets the pen stipple bitmap, which must be an 8 x 8 monochrome bitmap or #f, which turns off the stipple bitmap.

A bitmap cannot be used as a stipple if it is selected into a bitmap-dc% object; if the given bitmap is selected into a bitmap-dc% object, an exn:application:mismatch exception is raised. A pen cannot be modified if it was obtained from a pen-list% or while it is selected into a drawing context.

• (send a-pen set-stipple stipple) -> void
      stipple : bitmap% object or #f