Module #04.01.01 : Polyline

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

SEMANTIC REQUIREMENTS:

*** *** *** *** ***   <Polyline 3>   *** *** *** *** ***


SR1.  <Polyline 3> creates a polyline 3 element in the CSS;
elements with fewer than two points are valid.
#F 9
#D 7.3.1.1
#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 
SR2.  If current element is polyline 3 then <inquire current
element type and size> returns the element type as polyline 3 and
the appropriate element size.
#F 303
#D 7.3.1.1
#S 4.4.4/29/5
#T P01/1 P01/3 
SR3.  If current element is polyline 3 then <inquire current
element content> returns the appropriate data for polyline 3.
#F 304
#D 7.3.1.1
#S 4.4.4/29/5
#T P01/2 P01/4 
*** *** *** *** ***   <Polyline>   *** *** *** *** ***


SR4.  <Polyline> creates a polyline element in the CSS; elements
with fewer than two points are valid.
#F 10
#D 7.3.1.2
#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 
SR5.  If current element is polyline then <inquire current
element type and size> returns the element type as polyline and
the appropriate element size.
#F 303
#D 7.3.1.2
#S 4.4.4/29/5
#T P01/5 P01/7 
SR6.  If current element is polyline then <inquire current
element content> returns the appropriate data for polyline.
#F 304
#D 7.3.1.2
#S 4.4.4/29/5
#T P01/6 P01/8 
SR7. <Polyline> and <polyline_3> primitives are specified by an
ordered list of 2D or 3D points, expressed in modelling
coordinates (MC).  The primitive is rendered by connecting each
pair of successive MC points with a straight line segment.
#F 9 10
#D 7.3.1.1 7.3.1.2
#S 4.5.1/34/1
#T P02/1 P02/2 P02/3 P02/4 P02/5 #C A list containing fewer than two points has no pairs of points
and therefore has no visual effect.
LOCAL DICTIONARY:

  Functions ---
  009: ppl3    <polyline 3>
  010: ppl     <polyline>
  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
  7.3.1.1  ...  polyline_3
  7.3.1.2  ...  polyline
 





PROGRAM 1:
Polyline element

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

PROGRAM 2:
Appearance of polylines

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

End of documentation for 04.01.01