canvas::snap(n) Variations on a canvas canvas::snap(n)
__________________________________________________________________________________________________________________________________________________NAME
canvas::snap - Canvas snapshot to Tk photo image
SYNOPSIS
package require Tcl 8.5
package require Tk 8.5
package require canvas::snap ?1.0.1?
package require img::window
::canvas::snap pathName
_________________________________________________________________DESCRIPTION
This package provides a command to take snapshots of arbitrary canvases.
API
::canvas::snap pathName
Takes a snapshot of the canvas pathName. The result is the name of a new Tk photo image containing the snapshot.
Note that this command has a side-effect. To avoid having white rectangles where other windows may overlap the canvas this command
forces the toplevel window the canvas is in to the top of the stacking order.
KEYWORDS
canvas, image, photo, print screen, snapshot
COPYRIGHT
Copyright (c) 2004 George Petasis (http://wiki.tcl.tk/1404)
Copyright (c) 2010 Documentation, Andreas Kupries
canvas 1.0.1 canvas::snap(n)
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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?
_________________________________________________________________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)
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