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?

_________________________________________________________________

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.).

KEYWORDS

       zoom