Provided by: tklib_0.5-3_all bug


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


       package require Tcl  8.4

       package require Tk  8.4

       package require canvas::zoom  ?0.1?

       ::canvas::zoom pathName ?options?



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


       ::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.

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

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

              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.

              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.

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