set-scale

Sets a scaling factor that maps logical coordinates to device coordinates.

Changing a dc<%> object's origin or scale invalidates region% objects associated with the device context. See region% for more information.

Restrictions on the magnitude of drawing coordinates are described with dc<%>.

• (send a-dc set-scale x-scale y-scale) -> void
      x-scale : non-negative real number
      y-scale : non-negative real number