Module #04.01.05 : Fill area

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DESCRIPTION: This module tests that fill areas are rendered
correctly and that a program can set up a fill area element in the
CSS, which will create a primitive upon traversal.

SEMANTIC REQUIREMENTS:

*** *** *** *** ***   <Fill area 3>   *** *** *** *** ***


SR1.  <Fill area 3> creates a fill area 3 element in the CSS;
elements with fewer than three vertices are valid.
#F 17
#D 7.3.1.9
#S 4.4.1/22/3 4.5.1/34/1
#T P01/1 P01/2 P01/3 P01/4 P02/1 P02/2 P02/3 P02/4 P02/5 P03/1 P03/2 
SR2.  If current element is fill area 3 then <inquire current
element type and size> returns the element type as fill area 3 and
the appropriate element size.
#F 303
#D 7.3.1.9
#S 4.4.4/29/5
#T P01/1 P01/3 
SR3.  If current element is fill area 3 then <inquire current
element content> returns the appropriate data for fill area 3.
#F 304
#D 7.3.1.9
#S 4.4.4/29/5
#T P01/2 P01/4 
*** *** *** *** ***   <Fill area>   *** *** *** *** ***


SR4.  <Fill area> creates a fill area element in the CSS; elements
with fewer than three vertices are valid.
#F 18
#D 7.3.1.10
#S 4.4.1/22/3 4.5.1/34/1
#T P01/5 P01/6 P01/7 P01/8 P02/1 P02/2 P02/3 P02/4 P02/5 P03/1 P03/2 
SR5.  If current element is fill area then <inquire current
element type and size> returns the element type as fill area and
the appropriate element size.
#F 303
#D 7.3.1.10
#S 4.4.4/29/5
#T P01/5 P01/7 
SR6.  If current element is fill area then <inquire current
element content> returns the appropriate data for fill area.
#F 304
#D 7.3.1.10
#S 4.4.4/29/5
#T P01/6 P01/8 
SR7. <Fill area> and <fill area 3> primitives are specified by an
ordered list of 2D or 3D points, expressed in modelling
coordinates (MC).  The primitive is rendered as a single, closed
polygonal area, whose vertices are the points in the list.
#F 17 18
#D 7.3.1.9 7.3.1.10
#S 4.5.1/34/1
#T P02/1 P02/2 P02/3 P02/4 P02/5 P03/1 P03/2 #C A list containing fewer than three vertices has no area and
therefore has no visual effect. The visual effect of degenerate
fill areas with more than two points, or of non-planar fill areas
is not specified by the standard.
SR8.  The interior of a fill area is determined by the number of
intersections between a straight line drawn from a given point to
infinity and the fill area boundary.  If the number of intersections
is odd, the point is in the interior, otherwise it is outside.
#F 17 18
#D 7.3.1.9 7.3.1.10
#S 4.5.1/35/6
#T P03/1 P03/2 
LOCAL DICTIONARY:

  Functions ---
  017: pfa3    <fill area 3>
  018: pfa     <fill area>
  303: pqcets  <inquire current element type and size>
  304: pqceco  <inquire current element content>
 
  Data Structures ---
  7  ...  structure_state_list
  7.3  ...  list_of_structure_elements
  7.3.1  ...  graphical_primitives
  7.3.1.9  ...  fill_area_3
  7.3.1.10 ...  fill_area
 





PROGRAM 1:
Fill area element

You may inspect either the
design or
code for this program.

PROGRAM 2:
Appearance of fill areas

You may inspect either the
design or
code for this program.

PROGRAM 3:
Appearance of fill area interiors

You may inspect either the
design or
code for this program.

End of documentation for 04.01.05