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canvas::zoom(3tk) Variations on a canvas canvas::zoom(3tk) 





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



  

  
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.








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







  

    0.2.1
    tklib