'\"
'\" Generated from file 'canvas_zoom\&.man' by tcllib/doctools with format 'nroff'
'\"
.TH "canvas::zoom" 3tk 0\&.2\&.1 tklib "Variations on a canvas"
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.SH NAME
canvas::zoom \- Zoom control for canvas::sqmap
.SH SYNOPSIS
package require \fBTcl  8\&.4\fR
.sp
package require \fBTk  8\&.4\fR
.sp
package require \fBsnit \fR
.sp
package require \fBuevent::onidle \fR
.sp
package require \fBcanvas::zoom  ?0\&.2\&.1?\fR
.sp
\fB::canvas::zoom\fR \fIpathName\fR ?options?
.sp
.BE
.SH DESCRIPTION
This package provides a widget to enable the user of a map display to
control the zoom level\&.
.SH API
.TP
\fB::canvas::zoom\fR \fIpathName\fR ?options?
Creates the zoom control widget \fIpathName\fR and configures it\&. The
methods and options supported by the new widget are described in the
following sections\&.
.sp
The result of the command is \fIpathName\fR\&.
.PP
.SS OPTIONS
.TP
\fB-orient\fR
The value for this option is either \fBvertical\fR, or
\fBhorizontal\fR, specifying the orientation of the major axis of
the widget\&. The default is \fBvertical\fR\&.
.TP
\fB-levels\fR
The value for this option is a non-negative integer\&. It specifies the
number of zoom levels to support\&.
.TP
\fB-variable\fR
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\&.
.TP
\fB-command\fR
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\&.
.PP
.SS METHODS
The widget supports no methods beyond the standard (\fBconfigure\fR,
\fBcget\fR, etc\&.)\&.
.SH "BUGS, IDEAS, FEEDBACK"
This document, and the package it describes, will undoubtedly contain
bugs and other problems\&.
Please report such in the category \fIcanvas\fR of the
\fITklib Trackers\fR [http://core\&.tcl\&.tk/tklib/reportlist]\&.
Please also report any ideas for enhancements you may have for either
package and/or documentation\&.
.SH KEYWORDS
zoom