
Editimage(Display Utils)     Khoros      Editimage(Display Utils)

     Zoom

     The Zoom subform gives the user the ability to zoom in on an
     entire image or on a selected region of the image.  The zoom
     function is accomplished via pixel replication.

     The Zoom Window

          The Zoom Window, located at the bottom of the Zoom Sub-
          form, will display the portion of the displayed image
          over which the mouse cursor is centered.  The zoom win-
          dow itself can be treated as a regular X window, which
          allows the user to zoom in on a larger portion of an
          image than will fit in the original zoom window by sim-
          ply resizing the zoom window.

     Update Mode

          The Zooming function may be operated in two modes: Con-
          tinous or Button Press.  When the update mode is Con-
          tinuous, the zoom window is continually updated accord-
          ing to the cursor position in the displayed image.
          When the update mode is Button Press, the zoom window
          does not update until the mouse is clicked within the
          displayed image.

     Changing Zoom Factor

          To change the zoom factor, place the mouse cursor in
          the zoomfactor parameter box and enter the new zoom
          factor (a "^" will indicate the position of the cursor
          - this can be changed by re-positioning the mouse cur-
          sor and clicking). After the desired zoom factor is
          entered, hitting the <cr> key will update the zoom fac-
          tor, and the image in the zoom window will now be mag-
          nified by the new zoom factor.  Warning:  Since zoom
          works via pixel replication, zooming by a factor of
          less than one will may ambiguous results.

     Zoom Window Cursor

          The zoom window, by default, has a "dummy" cursor
          displayed that reflects the position of the actual cur-
          sor in the displayed image.  This default zoom window
          cursor appears as a large "+" sign.  The other dummy
          cursor that is available for the zoom window is
          smaller, and shaped like a box.  Depending on the
          characteristics of the image that is currently
          displayed, one or the other of the available dummy cur-
          sors may be more appropriate.  Alternatively, some
          users may not want the dummy" cursor to be displayed at
          all.  The "Zoom Window Cursor" option is a cyclic
          option:  the first click will change the dummy cursor
          from the large "+" to the small box;   the second click
          will turn the dummy cursor off; and the third click
          will turn the dummy cursor back on, in the large "+"
          shape.  After this, the cycle will repeat.

          Copyright 1992, University of New Mexico. All rights
          reserved.

Khoros                    Release: 1.0                          1

