proc multiZone_open { filename } {

# 1 means success

    global IMAGE_DISPLAY_WIN ZONING_SCALE_FACTOR DISPLAY_IMAGE XV xvprocess \

	    multiZone_display_open

    set open 1

    if { $multiZone_display_open == $open } {

	focus .zoning_window

    } else {

	toplevel .zoning_window

	init_zoning_display .zoning_window

    }

#   puts stdout "Opening $filename"

    page_open $filename

# Scale image to display    

    set ZONING_SCALE_FACTOR .50

#[ max [expr 800.0/[get_page_height]] \

#		[expr 800/[get_page_width]] ]

#   puts stdout "Done putting into page structure"

    if { 1 }  {

	set display_height [expr $ZONING_SCALE_FACTOR * [get_page_height]]

	set display_width [expr $ZONING_SCALE_FACTOR * [get_page_width]]

	append geometry [expr int($display_width)] x [expr int($display_height)]

#	puts stdout "Displaying Image"

	if { $DISPLAY_IMAGE == $XV } {

	    set xvprocess [exec xv $filename &]

	    puts stdout "xvprocess $xvprocess"

	} else {

# use the canvas...

	DISPLAY_INTERVALS .zoning_window.work_space $ZONING_SCALE_FACTOR

	FIND_LINES

	}

    } else {

	popup_image_failure_win

    }

    puts stdout "Determining Line boundaries"

}

proc init_zoning_display { window } {

    global ZONING_SCALE_FACTOR BACKGROUND FOREGROUND scroll_inc

	wm geometry $window 800x800

	wm title $window "Zoning Window"

	wm minsize $window 400 300

        $window configure -background $BACKGROUND

    set canvas_width 1000

    set canvas_height 1000

   canvas $window.work_space -bg white -xscrollcommand \

	  "$window.xscroller set" -yscrollcommand \

	  "$window.yscroller set" -xscrollincrement \

	   $scroll_inc -cursor {crosshair black gray}  \

	   -width $canvas_width -height $canvas_height 

# two scrollbars

    scrollbar $window.xscroller -command "$window.work_space xview" -orient horizontal -background $BACKGROUND

    scrollbar $window.yscroller -command "$window.work_space yview" -background $BACKGROUND

    pack $window.xscroller -side bottom -fill x

}

proc max { a b } {

    if { [expr $a] > [expr $b] } {

	return $a

    } else {

	return $b

    }

}

set x_init 0

set y_init 0

set x_final 0

set y_final 0

set started_region 0

set region_count 0

proc initialize_region_grab { window } {

#

#

# facilitates the grabbing of a rectangle of the window

# using mouse button 1

# canvas subwindow must be called $window.work_space

    global x_init y_init x_final y_final started_region region_data region_list region_id arrow_in_progress current_arrow

    bind $window.work_space <ButtonPress-1> {

	if [expr ! $started_region] {

	    grab set $window 

	    set x_init [$window.work_space canvasx %x]

	    set y_init [$window.work_space canvasy %y]

	    set region_id [$window.work_space create rectangle $x_init $y_init $x_init $y_init -outline black -width 3 ]

	    $window.work_space itemconfigure $region_id -tags region$region_id

	    set started_region 1

	}

    }

    bind $window.work_space <ButtonRelease-1> {

	set x_final [$window.work_space canvasx %x]

	set y_final [$window.work_space canvasy %y]

	$window.work_space coords region$region_id $x_init $y_init $x_final $y_final

	# if finishing a rectangle, initialize its stuff in the array

	if {$x_init <= $x_final} {

	    set region_data($region_id,x_init) $x_init

	    set region_data($region_id,x_final) $x_final

	} else {

	    set region_data($region_id,x_final) $x_init

	    set region_data($region_id,x_init) $x_final

	}

	if {$y_init <= $y_final} {

	    set region_data($region_id,y_init) $y_init

	    set region_data($region_id,y_final) $y_final

	} else {

	    set region_data($region_id,y_init) $y_final

	    set region_data($region_id,y_final) $y_init

	}

	set region_data($region_id,next_region_id) 0

	lappend region_list $region_id

	make_region_buttons $region_id	    

	set started_region 0

	grab release $window

    }

    bind $window.work_space <B2-Motion> {

	if $arrow_in_progress {

	    set curx [$window.work_space canvasx %x] 

	    set cury [$window.work_space canvasy %y]

	    $window.work_space coords $current_arrow 0 0 $curx $cury

	}

    }

    bind $window.work_space <B1-Motion> {

	if $started_region {

	    set curx [$window.work_space canvasx %x] 

	    set cury [$window.work_space canvasy %y]

	    $window.work_space coords region$region_id $x_init $y_init $curx $cury

	} 

    }

    bind $window <Leave> {

	# on leaving the display, release control of the mouse etc.

	# maybe make it scroll instead?

	if $started_region {

	    grab release $window

	    set started_region 0

	    $window.work_space coords region$region_id 0 0 0 0  

	}

    }

}

set arrow_in_progress 0

proc make_region_buttons {reg_id } {

    global region_data kill_button_data next_button_data arrow_in_progress current_arrow

    set x_init $region_data($reg_id,x_init)

    set y_init $region_data($reg_id,y_init)

    set next_num [$window.work_space create rectangle $x_init $y_init [expr $x_init + 40] [expr $y_init + 20]  -tags "region$reg_id next_button$reg_id"]

#statement above had -fill blue between 20 and -tags

    set next_button_data($next_num,reg_id) $reg_id

    $window.work_space bind next_button$reg_id <Double-2> {

	set reg_id $next_button_data([$window.work_space find withtag current],reg_id)

	if { $arrow_in_progress } {

	    finish_arrow $reg_id

	} else {

	    set canvas_x [$window.work_space canvasx %x] 

	    set canvas_y [$window.work_space canvasy %y]

	    start_arrow $reg_id $canvas_x $canvas_y

	    puts stdout "Starting an arrow at $canvas_x $canvas_y"

	}

    }

    set kill_num [$window.work_space create rectangle [expr $x_init] $y_init [expr $x_init + 20] [expr $y_init + 20] -fill red  -tags "region$reg_id kill_button$reg_id"]

    set kill_button_data($kill_num,reg_id) $reg_id

    $window.work_space bind kill_button$reg_id <Double-2> {

	set reg_id $kill_button_data([$window.work_space find withtag current],reg_id)

	destroy_region $reg_id $window.work_space

    }

}

proc start_arrow { reg_id x_start y_start } {

    global arrow_in_progress next_button_data region_data current_arrow

    set path_name $window.work_space

# start an arrow in the middle of the little red button

    set arrow [$window.work_space create line $x_start $y_start $x_start $y_start -width 3 -arrow last -arrowshape {6.0m 8.0m 1.5m} -fill blue -tags arrow$reg_id]

    set region_data($reg_id,arrow) $arrow

    set arrow_in_progress 1

    set current_arrow $arrow

}

proc destroy_region { reg_id path_name } {

    $path_name delete region$reg_id

    puts stdout "Destroying $reg_id"

}