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One of the most important widgets is the Canvas, which is used to
draw on just like the canvas of a painting.
The canvas is a complex widget with its own rules. For instance,
the items on the canvas have to be created with $canvas->create()
and later modified with $canvas->itemconfigure. By the way:
$canvas->createLine(...)is equivalent to
$canvas->create('line', ...);
Actions on canvas items are not via the common configure
interface, because they are no objects: the canvas stores the information
of items internally. For items, you have to use
$canvas->itemconfigure.
Furthermore, there are complex canvas functions like move. Those
functions work on single items or on groups of items which share the same
tag.
| Tk layout -place | Tk callbacks ;4 |
Created by Mark Overmeer with PPresenter on 22 May 2000.