/[fenfire]/journals/plans/SA_2003.rst
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revision 1.135 by tjl, Wed May 14 12:02:25 2003 UTC revision 1.136 by tjl, Wed May 14 12:07:57 2003 UTC
# Line 449  Break lines Line 449  Break lines
449    
450  .. make sure about the concrete stuff  .. make sure about the concrete stuff
451    
452  *Break lines* are a technique used in technical drawing  Break lines are another one of Fenfire's user interface techniques
453    that have been influenced by technical drawing.
454    In technical drawing, break lines are used
455  for indicating  for indicating
456  where an object extends beyond what is drawn in the current  where an object extends beyond what is drawn in the current
457  diagram. It is visually clear since it uses a shape that  diagram. It is visually clear since it uses a shape that
458  is obviously not a part of the object's own shape  is obviously not a part of the object's own shape
459  (wiggly freehand line, see Fig. [ref-fignasa]_).  (wiggly freehand line, see Fig. [ref-fignasa]_).
460  We apply this technique by drawing the buoys as  We apply this technique by drawing the buoys as
461  non-photorealistical pieces torn off the target document.  non-photorealistic pieces torn off the target document.
462    
463  To allow for fluid animation,  An important part of the design of break lines in Fenfire
464  the shapes of the break lines need to be carefully designed.  is the fluid animation:
465  For example, animating a fragment to a full document  for example, animating a fragment to a full document
466  should not look like the edge just gliding  should not look like the edge just gliding
467  over the document, but rather as if larger and  over the document, but rather as if larger and
468  larger parts were magically torn off the original document.  larger parts were magically torn off the original document.
469    In the software engineering part of the Fenfire project, we have
470    just accepted that this type of animation
471    seems to work and moved on; however, this has opened a number of
472    interesting questions for basic research.
473    
474    
475  .. figure:: ../../manuscripts/xupdf/mercury5part2  .. figure:: ../../manuscripts/xupdf/mercury5part2
476     :width: 8.45cm     :width: 8.45cm
# Line 478  larger parts were magically torn off the Line 485  larger parts were magically torn off the
485  The concrete research goals are to evaluate the practical value of  The concrete research goals are to evaluate the practical value of
486  break lines as implemented in the Fenfire project and  break lines as implemented in the Fenfire project and
487  to study more formally the perceptual properties  to study more formally the perceptual properties
488  of different types of torn edges.  of different types of break lines.
489  Especially the properties of the animation are interesting,  Especially the properties of the animation are interesting,
490  because it looks somewhat natural even though  because the motion appears quite natural even though
491  there is no real-world analogue.  there is no real-world analogue.
492    
493    
494  Text filtering  Text filtering

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