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.).

KEYWORDS

       zoom