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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.).

KEYWORDS
       zoom



canvas                                              0.2.1                                    canvas::zoom(n)