Version 1 of Canvas item selection by mouse click

Updated 2014-05-08 16:38:07 by brusch

There are 2 problems when looking for items at a given position:

• On mouse click, you get window coordinates, but you need canvas coordinates for "find".
• Canvas find returns only the ID of the item, that's a plain number. You will need to retrieve the parameters of the item by further functions.

` canvas .c1 bind .c1 <Double-1> { onDblClick %x %y } proc onDblClick {x y} {

        set x [.c1 canvasx $x] ; set y [.c1 canvasy $y]
        set i [.c1 find closest $x $y]
        set t [.c1 gettags $i]
        setLog "$i $t"

}`