Skip to Main Content
Perl in a Nutshell, 2nd Edition
book

Perl in a Nutshell, 2nd Edition

by Nathan Patwardhan, Ellen Siever, Stephen Spainhour
June 2002
Beginner content levelBeginner
759 pages
80h 42m
English
O'Reilly Media, Inc.
Content preview from Perl in a Nutshell, 2nd Edition

The Canvas Widget

Create a canvas for drawing with the Canvas method. The Canvas widget uses a coordinate system with the x coordinate increasing as you move right, and the y coordinate increasing as you move down (i.e., the y coordinate is mathematically upside-down). The x and y coordinates are specified in pixels by default.

$parentwidget->Canvas (options)

The standard configuration options that apply to Canvas are: -background, -bor-derwidth, -cursor, -height, -highlightbackground, -highlightcolor, -highlight-thickness, -insertbackground, -insertborderwidth, -insertofftime, -inserton-time, -insertwidth, -relief, -selectbackground, -selectborderwidth, -selectfore-ground, -state, -takefocus, -width, -xscrollcommand, and -yscrollcommand.

Other options are:

-closeenough => amount

The distance considered “close enough” to an item to be judged to be within it. Default is 1 pixel.

-confine => boolean

Whether to limit the canvas to the scroll region. Default is 1.

-scrollregion => [ x, y, w, h ]

Sets the region that the user is allowed to scroll. The option is a list reference that conveniently corresponds to the return value of the bbox method.

-xscrollincrement => amount

The distance to use for scrolling in the x direction.

-yscrollincrement => amount

The distance to use for scrolling in the y direction.

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Start your free trial

You might also like

Perl by Example, Fourth Edition

Perl by Example, Fourth Edition

Ellie Quigley
Perl Cookbook, 2nd Edition

Perl Cookbook, 2nd Edition

Tom Christiansen, Nathan Torkington
Perl in a Nutshell

Perl in a Nutshell

Nathan Patwardhan, Ellen Siever, Stephen Spainhour
Learning Perl, 7th Edition

Learning Perl, 7th Edition

Randal L. Schwartz, brian d foy, Tom Phoenix

Publisher Resources

ISBN: 0596002416Errata Page