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.).

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