Filling a Graphics Segment

After a graphics segment is opened, the GPI functions that follow become a part of a retained segment and are executed every time the segment itself is drawn.

The typical GPI functions that would be called are those that:

• Create graphics primitives-such as lines or markers
  
• Assign attributes to those primitives-such as color or line type.

However, there are a few GPI functions that you cannot call while there is an open segment-for example a second GpiOpenSegment. These functions are identified in GPI Function Context.

A presentation space can contain many segments. Each time you open a new segment, many attributes reset themselves to default values. Therefore, the current position and attribute values that apply before you call GpiOpenSegment cannot be guaranteed to be in effect after you call the function. Beginning each segment with a number of attribute-setting requests and, possibly, with GpiSetCurrentPosition, is recommended. Your application also might take advantage of GpiSetDefAttrs, for example, to minimize the number of attributes that must be dealt with upon opening a new segment.