canvas::zoom(n) Variations on a canvas canvas::zoom(n) ______________________________________________________________________________
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 speci-
fies 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)
Mac OS X 10.8 - Generated Wed Sep 5 15:57:42 CDT 2012