*** empty log message ***

1 files changed, 158 insertions, 0 deletions

diff --git a/sandbox/controls.tcl b/sandbox/controls.tcl
new file mode 100644
index 0000000..9301d1a
--- /dev/null
+++ b/sandbox/controls.tcl
@@ -0,0 +1,158 @@
+set tlbbox [.r add group $top -sensitive f -visible f -tags currentbbox]
+.r add rectangle $tlbbox "-3 -3 +3 +3"
+set trbbox [.r add group $top -sensitive f -visible f -tags currentbbox]
+.r add rectangle $trbbox "-3 -3 +3 +3"
+set blbbox [.r add group $top -sensitive f -visible f -tags currentbbox]
+.r add rectangle $blbbox "-3 -3 +3 +3"
+set brbbox [.r add group $top -sensitive f -visible f -tags currentbbox]
+.r add rectangle $brbbox "-3 -3 +3 +3"
+.r add rectangle $top "0 0 1 1" -linecolor red -tags "lasso" -visible f -sensitive f
+
+#
+# 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 atpoint $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
+    }
+}
+
+
+bind  .r "<ButtonPress-1>" "start_lasso %x %y"
+bind  .r "<ButtonRelease-1>" fin_lasso
+
+bind  .r "<ButtonPress-2>" {puts "at point='[.r find atpoint %x %y]'"}
+
+bind  .r "<ButtonPress-3>" "press %x %y motion"
+bind  .r "<ButtonRelease-3>" release
+
+bind  .r "<Shift-ButtonPress-3>" "press %x %y zoom"
+bind  .r "<Shift-ButtonRelease-3>" release
+
+bind  .r "<Control-ButtonPress-3>" "press %x %y rotate"
+bind  .r "<Control-ButtonRelease-3>" release
+
+.r bind current "<Enter>" showbox
+.r bind current "<Leave>" {hidebox %x %y}