canvas::zoom(n)             Variations on a canvas             canvas::zoom(n)



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NAME
       canvas::zoom - Zoom control for canvas::sqmap

SYNOPSIS
       package require Tcl  8.4

       package require Tk  8.4

       package require snit

       package require uevent::onidle

       package require canvas::zoom  ?0.2.1?

       ::canvas::zoom pathName ?options?

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DESCRIPTION
       This package provides a widget to enable the user of a map display to
       control the zoom level.

API
       ::canvas::zoom pathName ?options?
              Creates the zoom control widget pathName and configures it. The
              methods and options supported by the new widget are described in
              the following sections.

              The result of the command is pathName.

   OPTIONS
       -orient
              The value for this option is either vertical, or horizontal,
              specifying the orientation of the major axis of the widget. The
              default is vertical.

       -levels
              The value for this option is a non-negative integer. It
              specifies the number of zoom levels to support.

       -variable
              The value for this option is the name of a global or namespaced
              variable which is connected with the widget. changes to the zoom
              level made the widget are propagated to this variable, and in
              turn changes to the variable are imported into the widget.

       -command
              This option specifies a command prefix. This callback will be
              invoked whenever the zoom level is changed. It is called with
              two additional arguments, the zoom control widget, and the new
              zoom level, in this order.

   METHODS
       The widget supports no methods beyond the standard (configure, cget,
       etc.).

BUGS, IDEAS, FEEDBACK
       This document, and the package it describes, will undoubtedly contain
       bugs and other problems.  Please report such in the category canvas of
       the Tklib Trackers [http://core.tcl.tk/tklib/reportlist].  Please also
       report any ideas for enhancements you may have for either package
       and/or documentation.

KEYWORDS
       zoom



tklib                                0.2.1                     canvas::zoom(n)
