Panner(3I)

NAME

   Panner - two-dimensional scrolling and zooming

SYNOPSIS

   #include <InterViews/panner.h>

DESCRIPTION

   A  panner  is an interactor that manipulates the perspective of another
   interactor to provide two-dimensional scrolling and zooming.  A  panner
   is  composed  of  a slider and several adjusters, including two zoomers
   and four movers. The slider's position and  size  reflect  the  current
   origin,  size,  and  aspect  ratio  in  the  interactor's  perspective.
   Dragging the slider around with the  mouse  changes  the  perspective's
   curx and cury members.

PUBLIC OPERATIONS

   Panner(Interactor*, int size = 0)
          Create  a  panner  for the given interactor, optionally with the
          given width.  If the size is 0, a  reasonable  default  size  is
          used.    The   panner's   aspect  ratio  reflects  that  of  the
          perspective.

   Slider(Interactor*)
   Slider::Handle(Event&)
   Slider::Reshape(Shape&)
   Slider::Update()
          A slider reflects and lets the user specify the visible  portion
          of the view.  A rectangle represents the visible area, while the
          area surrounding it represents the  total  area.   Clicking  and
          holding  down  any  mouse  button on the rectangle allows you to
          drag it to a different position  within  the  total  area.   The
          perspective's  current  origin  is  shifted  to  reflect the new
          position when the button is released.  Holding  down  the  shift
          key   while   dragging   the  rectangle  constrains  its  motion
          horizontally or  vertically.   Clicking  outside  the  rectangle
          moves  it  in  the  corresponding  one  of eight directions; for
          example, clicking to the right of the rectangle moves it to  the
          right.  If the left mouse button is used, the movement increment
          equals the perspective's sx or sy member variables.  The  middle
          mouse  button increments by lx or ly, and the right mouse button
          centers the rectangle around the cursor.  The Reshape call  sets
          the  width  of  the slider to that of the passed Shape and calls
          Change on the parent interactor.  Update redisplays  the  slider
          to reflect a change in the interactor's perspective.

X DEFAULTS

   The ``syncScroll'' resource specifies whether the slider should work in
   real-time  or  not.   When  synchronized  scrolling  is  employed   the
   interactor  scrolls  synchronously  as the slider is dragged; otherwise
   the slider's  outline  follows  the  mouse  during  dragging,  and  the
   interactor  is  scrolled only after the user stops dragging the slider.
   Sliders will scroll synchronously if their syncScroll resource  is  set
   to ``on'' or ``true.''

SEE ALSO

   Adjuster(3I), Interactor(3I), Perspective(3I)

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