** Summary **

'''text''' is one of the standard `[[[canvas]]` item types

** Getting Text Dimensions **

To get the dimensions of a text item, use `[[[canvas] bbox]`.  Examples:

   [A Graph plotter]:   


''''italic text''''** Demos **

from simple to complex:

   [canvashelp]:   expanding/collapsing text item


***
***
***
****
**`''
======
[http://here.com/photo.gif|png|jpg]http://here.com/what.html%|%link name%|%[your heading2]
======
''`**
****
***
***
***

** Rotated Text **

   [Rotated canvas text]:   
   [Rotate text on a canvas]:   


** Text Items as textvariables **

[RS]:  With the following few lines you can associate one (or any number of) text
items to update by [trace]ing when a variable changes value:

======
proc canvas'text'update {canvas tag _var - -} {
    upvar $_var var
    $canvas itemconfig $tag -text $var
}
#---------------------- usage & demo code
pack [canvas .c]
.c create text 100 100 -tag vartext
trace var testing w [list canvas'text'update .c vartext]
set testing "hello, world!" ,# yet another way to say it...
======

The following variation packages both the definition and the implementation of
the trace into the same command, differentiated by the number of arguments:

======
proc canvas'textvar {canvas tag _var args} {
    upvar 1 $_var var
    if { [llength $args] } {
        $canvas itemconfig $tag -text $var
    } else {
        uplevel 1 trace var $_var w \
            [list [list canvas'textvar $canvas $tag]]
    }
}
canvas'textvar .c vartext testing
set testing "hello again!"
======


**  Text item background **

Text items are on a transparent background. You can give them an opaque
background by first creating the text, then determining its b(ounding )box,
drawing a rect with equal `-fill` and `-outline`, and finally raising the text
item again. Example, where this happens on demand when the user clicks on a
text:

======
$canvas bind text <1> {
    %W create rect [%W bbox current] -fill white -outline white -tag bg
    %W lower bg text
}
$canvas bind text <3> {%W delete bg} ;# RS
======




<<categories>> Tk syntax help | Command | Graphics | Widget