When you have finished creating a graphics segment, close it using GpiCloseSegment. There can be only one open segment at a time in a single graphics presentation space, so you must close one segment before going on to the next.
There is some degree of clean-up processing associated with using GpiCloseSegment, known as close-segment processing, that can make current attribute values unreliable. For more information about the effects of GpiOpenSegment and GpiCloseSegment on current attributes, see Graphics Attributes.