/[gzz]/manuscripts/FilletArt/filletart.rst
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revision 1.4 by jvk, Sat May 10 14:50:03 2003 UTC revision 1.5 by tjl, Sat May 10 19:19:28 2003 UTC
# Line 4  Fillets: soft shapes for easily percepti Line 4  Fillets: soft shapes for easily percepti
4    
5      Tuomas J. Lukka, Janne V. Kujala and Marketta Niemelä      Tuomas J. Lukka, Janne V. Kujala and Marketta Niemelä
6    
7  [ We've left out the official references since they're available  [ We've left out most of the official references since
8      they're available
9    in the original article - hope that's as was intended..    in the original article - hope that's as was intended..
10      If not, tell us
11    
12      Asterisks like *this* signify that the word "this"
13      should be italicized.
14  ]  ]
15    
16  [1500-2000 words - quarterpageimages * 262]  [1500-2000 words - quarterpageimages * 262]
17  [quarterpageimages = 2   --> ]  [quarterpageimages = 2   --> ]
18    
19  Diagrams of graphs (*nodes* connected by *arcs*) are usually drawn  Diagrams of graphs (*nodes* connected by *arcs*) are usually drawn
20  using boxes and lines between them.  For simple graphs, this is quite  using boxes and lines between them.  
21  satisfactory, but when lines must cross each other and  the graph is badly  Displaying relationships between nodes by lines or arcs is efficient as
22  laid out, the boxes-and-lines drawings can actually be ambiguous.  If the  physical connection makes the nodes to be perceived as parts of a single
23    object, according to the law of connectivity (one of the laws of
24    perceptual organization). Therefore, the viewer needs no conscious effort
25    to perceive the semantic relationship between the nodes.
26    For simple graphs, this is quite
27    satisfactory, but when lines must cross each other and the graph is badly
28    laid out, the boxes-and-lines drawings can actually be ambiguous. If the
29  layout cannot be changed (or if that would lead to other complications),  layout cannot be changed (or if that would lead to other complications),
30  a rendering method which allows the viewer to distinguish between the  a rendering method which allows the viewer to distinguish between the
31  different possibilities is needed.  different possibilities is needed.
# Line 39  Filleting is an instance of a more gener Line 50  Filleting is an instance of a more gener
50  known as *blending* - creating surfaces that  known as *blending* - creating surfaces that
51  meet several existing surfaces smoothly.  meet several existing surfaces smoothly.
52    
53  Displaying relationships between nodes by lines or arcs is efficient as  Fillets aim to
 physical connection makes the nodes to be perceived as parts of a single  
 object, according to the law of connectivity (one of the laws of  
 perceptual organization). Therefore, the viewer needs no conscious effort  
 to perceive the semantic relationship between the nodes. Fillets aim to  
54  enhance the perception of connectivity by implementing the connecting  enhance the perception of connectivity by implementing the connecting
55  lines with continuity. The node and the connecting line form one object,  lines with continuity.
56    The node and the connecting line form one object,
57  without an abrupt disruption in perception, thus making it easy to follow  without an abrupt disruption in perception, thus making it easy to follow
58  the connection between nodes.  the connection between nodes.
   
59  Our use of fillets is entertainingly analogous to the use in mechanical  Our use of fillets is entertainingly analogous to the use in mechanical
60  engineering: fillets ensure that the human perception system  engineering:
61    fillets ensure that the human perception system
62  doesn't break an object and a connection starting  doesn't break an object and a connection starting
63  from it into two distinct objects.  from it into two distinct objects.
64    
65  The filling of connections in graph diagrams  The filling of connections in graph diagrams
66  conforms to the Gestalt  conforms to the Gestalt
67  principle of good  principle of good

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