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$tlbbox = $zinc->add('group', $top,
-sensitive => 0, -visible => 0,
-tags 'currentbbox');
$zinc->add('rectangle', $tlbbox, [-3, -3, +3, +3]);
$trbbox = $zinc->add('group', $top,
-sensitive => 0, -visible => 0,
-tags => 'currentbbox');
$zinc->add('rectangle', $trbbox, [-3, -3, +3, +3]);
$blbbox = $zinc->add('group', $top,
-sensitive => 0, -visible => 0,
-tags => 'currentbbox');
$zinc->add('rectangle', $blbbox, [-3, -3, +3, +3]);
$brbbox = $zinc->add('group', $top,
-sensitive => 0, -visible => 0,
-tags 'currentbbox');
$zinc->add('rectangle', $brbbox, [-3, -3, +3, +3]);
$zinc->add('rectangle', $top, [0, 0, 1, 1],
-linecolor => 'red', -tags => 'lasso',
-visible => 0, -sensitive => 0);
#
# Controls for the window transform.
#
proc press {lx ly action} {
global x y angle
set x $lx
set y $ly
set angle [expr atan2($y, $x)]
bind .r "<Motion>" "$action %x %y"
}
proc motion {lx ly} {
global x y
set it [.r find withtag controls]
if {$it != ""} {
set it [.r group [lindex $it 0]]
}
set res [.r transform $it "$lx $ly $x $y"]
set nx [lindex $res 0]
set ny [lindex $res 1]
set ox [lindex $res 2]
set oy [lindex $res 3]
.r translate controls [expr $nx - $ox] [expr $ny - $oy]
set x $lx
set y $ly
}
proc zoom {lx ly} {
global x y
if {$lx > $x} {
set maxx $lx
} else {
set maxx $x
}
if {$ly > $y} {
set maxy $ly
} else {
set maxy $y
}
set sx [expr 1.0 + double($lx - $x)/$maxx]
set sy [expr 1.0 + double($ly - $y)/$maxy]
set x $lx
set y $ly
.r scale controls $sx $sy
}
proc rotate {lx ly} {
global angle
set langle [expr atan2($ly, $lx)]
.r rotate controls [expr -($langle-$angle)]
set angle $langle
}
proc release {} {
bind .r "<Motion>" ""
}
proc start_lasso {lx ly} {
global top x y cx cy
set x $lx
set y $ly
set cx $lx
set cy $ly
set coords [.r transform $top "$x $y"]
set fx [lindex $coords 0]
set fy [lindex $coords 1]
.r coords lasso "$fx $fy $fx $fy"
.r itemconfigure lasso -visible t
.r raise lasso
bind .r "<Motion>" "lasso %x %y"
}
proc lasso {lx ly} {
global top x y cx cy
set cx $lx
set cy $ly
set coords [.r transform $top "$x $y $lx $ly"]
set fx [lindex $coords 0]
set fy [lindex $coords 1]
set fcx [lindex $coords 2]
set fcy [lindex $coords 3]
.r coords lasso "$fx $fy $fcx $fcy"
}
proc fin_lasso {} {
global x y cx cy
bind .r "<Motion>" ""
.r itemconfigure lasso -visible f
# puts "x=$x, y=$y, cx=$cx, cy=$cy"
puts "enclosed='[.r find enclosed $x $y $cx $cy]', overlapping='[.r find overlapping $x $y $cx $cy]'"
}
proc getrect {x y} {
list [expr $x-3] [expr $y-3] [expr $x+3] [expr $y+3]
}
proc showbox {} {
global top tlbbox trbbox blbbox brbbox
if { ! [.r hastag current currentbbox]} {
if {[catch {.r find withtag current} item] } {
return
}
set coords [.r transform $top [.r bbox current]]
set xo [lindex $coords 0]
set yo [lindex $coords 1]
set xc [lindex $coords 2]
set yc [lindex $coords 3]
.r coords $tlbbox "$xo $yo"
.r coords $trbbox "$xc $yo"
.r coords $brbbox "$xc $yc"
.r coords $blbbox "$xo $yc"
.r itemconfigure currentbbox -visible t
}
}
proc hidebox {lx ly} {
set next [.r find closest $lx $ly]
if {[llength $next] > 1} {
set next [lindex $next 0]
}
if { $next == "" || ! [.r hastag $next currentbbox] ||\
[.r hastag current currentbbox]} {
.r itemconfigure currentbbox -visible f
}
}
$zinc->bind('<ButtonPress-1>', "start_lasso %x %y");
$zinc->bind('<ButtonRelease-1>', \&fin_lasso);
$zinc->bind('<ButtonPress-2>', sub { $closest = $zinc->find('closest', %x %y);
print "at point=$closest\n" });
$zinc->bind('<ButtonPress-3>', "press %x %y motion");
$zinc->bind('<ButtonRelease-3>', \&release);
$zinc->bind('<Shift-ButtonPress-3>', "press %x %y zoom");
$zinc->bind('<Shift-ButtonRelease-3>', \&release);
$zinc->bind('<Control-ButtonPress-3>' "press %x %y rotate");
$zinc->bind('<Control-ButtonRelease-3>', \&release);
$zinc->bind('current', '<Enter>', \&showbox);
$zinc->bind('current', '<Leave>', {hidebox %x %y});
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