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 Layout Mode comments: (July 28, 07)
 
 Overall:
 Lets copy inkscape's UI as much as is reasonable.  BUT: remember, we are
 annotating plots, not making icons!
 
   -in layout mode, we need a toolbar to select the various tools.
 
 Handles:
   -need mouseover feedback on handles (inkscape changes colours)
   -need feedback on potential selection. Inkscape uses mouse feedback,
    but since most objects will over a plot, this is mostly useless.  I think
    showing ghost handles would be better.
   -Handle dimensions should be fixed and should not depend on window/object/
    parent size.
    (It could be cool to have the size fixed relative to the screen size.)
   -Handles should lie outside the object so that they are accesible with 0
    size objects (eg, horizontal line).
   -Handles need to have some indication what they are/do (like inkscape).
   -to get to rotate mode, you have to click twice, which is too much like
    a double click (which calls up the properties dialog).  So, get rid
    of double click to properties dialog.  Instead get it from the rmb or
    from button 2. 
   -On resize, you should be able flip through zero to mirror the object.
    This is especially important for lines.
   -Sometimes clicking on an object does not bring up the handles.
    Is this a bug, or just a different mode?
 
 Line Properties:
   -By default, line properties should depend on the size (width + height) of
    the page/TopLevelView/Window and should not depend on the aspect ratio of
    the object, or its parent or the TLV.  This includes:
     -line widths
     -dash dimensions
     -arrow dimensions
     -Ends of wide lines - (should be always perpendicular to line)
    so,
     -resizing an object and not the window should not change its line
      widths. NOTE: this is not the same behavior as inkscape.
     -The vertical and horizontal lines of a box should always be equal 
      regardless of any resizing.
   -For 2.x, we should consider a per-object option to allow the line properties
    to be a function of the parent size, rather than the TLV size. 
   -Line property units should be 'points, if printed to US Letter'
 
 Aspect ratio
   -All objects except lines should have a 'preserve aspect ratio' option.
      -Fonts and Pictures should default to having this set. 
      -All others should default to this unset. 
   -When it is set, changing the aspect ratio of the object's parent or TLV will
    not change the aspect ratio of the objects
   -When it is set, moving the grab boxes should uniformly scale the object
    (but not Line Properties).
   -When it is set, rotations need to be in display space, to preserve
    relative angle.
   SO:
      -rectangles stay rectangles
      -fonts don't get distorted
   -When it is not set, rotations are in the (0-1, 0-1) space, so objects
    will only preserve their apparent aspect ratio if the TLV is square.
 
 
 Object Specific changes:
 Labels:
   -To create a lable, click to location, which pops up the dialog (same as 1.4)
    Apply/OK on dialog draws the label.  In the first instance, we don't need
    to support in-place text editing.
 
 Dialogs:
   -Inkscape uses multiple dialogs to edit different properties of an object.
    We should not.  Use tabbed dialogs instead.
   -They need to support everything the 1.4 dialogs support.