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revision 1.22 by jvk, Tue Nov 12 12:03:34 2002 UTC revision 1.23 by tjl, Tue Nov 12 12:22:22 2002 UTC
# Line 173  Northrup, Markosian: Artistic silhouette Line 173  Northrup, Markosian: Artistic silhouette
173    
174  Saito, Takahashi -- *the* reference (Image-space algorithm) - Computer Graphics Vol24 no4  Saito, Takahashi -- *the* reference (Image-space algorithm) - Computer Graphics Vol24 no4
175    
176  ZUI viewports!  
177    Contribution of this article
178    
179  \section{Tearing}  \section{Tearing}
180    
181    
182  - basic model: rectangular paper, of which a convex region is shown  - basic model: rectangular paper, of which a convex region is shown
183    
184    A smooth rectangular or elliptical frame can make small viewports seem claustrophobic.
185    One reason for this is that the frame is often visually too small for its contents
186    to yield a balanced graphical design. For example,
187    
188  - fundamental change of model: instead of *framing* the region of paper,  - fundamental change of model: instead of *framing* the region of paper,
189    we *tear* it out of the paper.    we *tear* it out of the paper.
190    
191    The torn edge separates itself visually from the content, alleviating
192    the ...
193    
194    
195  Considered from a purely physical viewpoint, the tearout is not really  Considered from a purely physical viewpoint, the tearout is not really
196  a good metaphor\cite{kuhn91formalization}:  a good metaphor\cite{kuhn91formalization}:
# Line 188  a real torn piece of paper cannot move, Line 198  a real torn piece of paper cannot move,
198  However, similar tearing has been used in technical drawings for quite some  However, similar tearing has been used in technical drawings for quite some
199  time to indicate that the depicted object extends beyond the part drawn in the diagram.  time to indicate that the depicted object extends beyond the part drawn in the diagram.
200    
201    Because of this, it should be readily comprehensible
202    to users that we're not tearing the original paper but only a depiction of it.
203    
204  - distinguishing between edges of paper and the viewport useful  - distinguishing between edges of paper and the viewport useful
205  - edge of paper = line, edge of viewport = torn  - edge of paper = line, edge of viewport = torn

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