                                                                vertex_move 
Chapter 9 Input Modes

The vertex_move mode is handy for shifting a vertex position (X Y coordinates)
on one map to match one on an adjacent map.  This activity is the digital form
of manual edgematching and it helps to insure that the maps comprising a
project will form one large map with integrity in the destination GIS
application.  As previously mentioned, vertex_move is a mode; when it is on,
the start and continue commands will perform the actual vector coordinate
shifting.  These commands are most efficiently activated with the mouse or
cursor supplying the X Y positions.  The normal sequence of actions would be:

         Activate the vertex_move mode (kbd entry, or menu selection), and
         specify the level to which to snap.
     
         Position the screen cursor (using the mouse or digitizer cursor) on or
         near the point (vertex) to be moved and activate the start command
         (kbd, function key, cursor key press).  LTPlus will search until it
         locates the closest actual vertex position and highlight it.
     
         Move the screen cursor to a position on or near the vertex to which
         the highlighted location should be moved and activate the continue
         command (kbd, function, cursor key press).  LTPlus will search for any
         vertex that is within a 1-pixel radius of that position and modify the
         previous first vertex to match.  If no vertex is found within the
         1-pixel radius, the X Y values will remain unchanges.
     
         Repeat the start-continue steps for all vertices which need to be
         moved.  End this activity by activating a new mode or by executing
         clear mode.
     
vertex_move l

    Sets the graphics input mode to vertex_move (for edgematching).  When in
    this mode, start will search for the nearest vertex (assembly required) to
    x y, continue will search for the nearest vector vertex.  If one is found
    within a 1-pixel radius, it will snap the original vertex to it.  If none
    is found, it will place the original vertex at x y.  Note that this affects
    only the vector file (not the raster), and that assembly is required.
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    Options/arguments:

         l    level to which to snap: 32-95
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    Example(s):

    To activate the vertex_move mode and snap to level 40, and move the vertex
    near 600,432 to the level 40 vertex near 604,430 enter:

         vertex_move 40
         start 600 432
         continue 604 430
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