get-dc

Returns the drawing context into which the buffer should be displayed, and returns the origin of the drawing context translated into the local coordinates of the buffer.

• (send a-wx:media-admin get-dc x y) -> wx:dc% object
      x = null : boxed inexact real or null
      y = null : boxed inexact real or null

  The x box is filled with the x-origin of the DC in buffer coordinates, unless x is null. The y box is filled with the y-origin of the DC in buffer coordinates, unless y is null.