#
# Copyright (c) 1993-1994 Regents of the University of California.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
# 3. All advertising materials mentioning features or use of this software
#    must display the following acknowledgement:
#	This product includes software developed by the Computer Systems
#	Engineering Group at Lawrence Berkeley Laboratory.
# 4. Neither the name of the University nor of the Laboratory may be used
#    to endorse or promote products derived from this software without
#    specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# @(#) $Header: /usr/src/mash/repository/vint/ns-2/nam/nam.tcl,v 1.2 1997/06/11 04:58:22 gnguyen Exp $ (LBL)
#
set tk_strictMotif 0

set uscale(m) 1e-3
set uscale(u) 1e-6
set uscale(k) 1e3
set uscale(M) 1e6

proc time2real v {
	global uscale
	foreach u [array names uscale] {
		set k [string first $u $v]
		if { $k >= 0 } {
			set scale $uscale($u)
			break
		}
	}
	if { $k > 0 } {
		set v [string range $v 0 [expr $k - 1]]
		set v [expr $scale * $v]
	}
	return $v
}
#XXX
proc bw2real v {
	return [time2real $v]
}

#XXX
proc mapf s { return $s }

proc version {} { return 1.0a1 }

option add Nam.foundry adobe startupFile
set ff [option get . foundry Nam]
set helv10 [mapf "-$ff-helvetica-medium-r-normal--*-100-75-75-*-*-*-*"]
set helv10b [mapf "-$ff-helvetica-bold-r-normal--*-100-75-75-*-*-*-*"]
set helv10o [mapf "-$ff-helvetica-bold-o-normal--*-100-75-75-*-*-*-*"]
set helv12 [mapf "-$ff-helvetica-medium-r-normal--*-120-75-75-*-*-*-*"]
set helv12b [mapf "-$ff-helvetica-bold-r-normal--*-120-75-75-*-*-*-*"]
set helv14 [mapf "-$ff-helvetica-medium-r-normal--*-140-75-75-*-*-*-*"]
set helv14b [mapf "-$ff-helvetica-bold-r-normal--*-140-75-75-*-*-*-*"]
set times14 [mapf  "-$ff-times-medium-r-normal--*-140-75-75-*-*-*-*"]

option add Nam.viewBackground gray80 startupFile
option add *font $helv12b startupFile
option add *Font $helv12b startupFile

option add Nam.disablefont $helv10o startupFile
option add Nam.smallfont $helv10b startupFile
option add Nam.medfont $helv12b  startupFile
option add Nam.helpFont $times14 startupFile
option add Nam.entryFont $helv10 startupFile

option add *Radiobutton.relief flat startupFile

option add Nam.rate		2ms	startupFile
option add Nam.movie		0	startupFile
option add Nam.granularity	40	startupFile
option add Nam.pause		1	startupFile

#
# use 2 pixels of padding by default
#
option add *padX 2 startupFile
option add *padY 2 startupFile
#
# don't put tearoffs in pull-down menus
#
option add *tearOff 0 startupFile

proc smallfont { } {
	return [option get . smallfont Nam]
}
proc mediumfont { } {
	return [option get . medfont Nam]
}

proc toggle_window w {
	if ![winfo exists $w] { build$w }
	global created$w
	if ![info exists created$w] {
		set created$w 1
		wm transient $w .
		update idletasks
		set x [winfo rootx .]
		set y [winfo rooty .]
		incr y [winfo height .]
		incr y -[winfo reqheight $w]
		incr y -20
 		# adjust for virtual desktops
		incr x [winfo vrootx .]
		incr y [winfo vrooty .]
		if { $y < 0 } { set y 0 }
		if { $x < 0 } {
			set x 0
		} else {
			set right [expr [winfo screenwidth .] - \
					   [winfo reqwidth $w]]
			if { $x > $right } {
				set x $right
			}
		}
		wm geometry $w +$x+$y
		wm deiconify $w
	} elseif [winfo ismapped $w] {
		wm withdraw $w
	} else {
		wm deiconify $w
	}
}

proc backFrame { } {
	global now timeStep
	settime [expr $now - $timeStep]
}

proc nextFrame { } {
	global now timeStep
	settime [expr $now + $timeStep]
}

proc net_settime t {}

#
# Set time slider to a tick value between 0 and 100.
#
set sliderPressed 0
proc settime t {
	#XXX
	net_settime $t    

        global sliderPressed range mintime timeSlider trace now nowDisp \
		maxtime graphName
        if { $t > $maxtime } {
		stop 1
		return
	} elseif { $t < $mintime } {
	        set t $mintime
	}
	set now $t
	set nowDisp [format %.6f $now]
	if { $sliderPressed == 0 } {
	        $timeSlider set [expr int(100. * ($now - $mintime) / $range)]
	}
	set event [$trace settime $now $sliderPressed]
	if { [string length $graphName] > 0 } {
		if { [string length $event] > 0 } {
			graph_update $event
		}
	}
}

proc draw_data_pnt { tim id } {
	global prevAckId prevPktId clearDataCmd clearAckCmd lastDrawCmd \
	       graphName
	if { $prevAckId != 0 } {
		tkgraph_cmd 0 $clearAckCmd
		set prevAckId 0
	} elseif { $prevPktId != 0 } {
		tkgraph_cmd 0 $clearDataCmd
	}
	set lastDrawCmd "draw_point $graphName $tim $id"
	tkgraph_cmd 1 $lastDrawCmd
	set clearDataCmd "clear_point $graphName $tim $id"
	set prevPktId $id
}

proc draw_ack_pnt { tim id } {
	global prevAckId prevPktId delay01 graphName lastDrawCmd clearAckCmd \
	       clearDataCmd
	if { $prevAckId != 0 } {
		tkgraph_cmd 0 $clearAckCmd
	} elseif { $prevPktId != 0 } {
		tkgraph_cmd 0 $clearDataCmd
		set prevPktId 0
	}
	set prevAckId $id
	set arriv [expr $tim + $delay01]
	set lastDrawCmd "draw_point $graphName $arriv $id"
	tkgraph_cmd 1 $lastDrawCmd
	set clearAckCmd "clear_point $graphName $arriv $id"
}

proc graph_update_interval tim {
	global intervalStart intervalEnd mintime maxtime lastDrawCmd \
	       interval graphName

	# Update graph interval as needed.
	set overlap [expr 0.2 * $interval]
	if { $tim > $intervalStart && $tim < $intervalEnd } {
		return
	}
	if { $tim > $maxtime } {
		stop 1
		return
	}
	if { $tim >= [expr $intervalEnd - $overlap] } {
		set intervalStart [expr $intervalEnd - $overlap]
	} elseif { $tim < $intervalStart } {
		set intervalStart [expr $tim - 0.5 * $interval]
	}
	set intervalEnd [expr $intervalStart + $interval]
		
	# Check if going beyond max x or min x and update interval
	# accordingly.
	if { $intervalEnd > $maxtime } {
		set intervalEnd [expr $maxtime + $overlap]
		set intervalStart [expr $intervalEnd - $interval]
	} elseif { $intervalStart <= $mintime } {
		set intervalStart 0.0
		set intervalEnd [expr $intervalStart + $interval]
	}

	set cmd [format "update_graph %s %.17g %.17g" \
			 $graphName $intervalStart $intervalEnd]
	tkgraph_cmd 1 $cmd
	
	# Redraw last point drawn.
	tkgraph_cmd 1 $lastDrawCmd
}

proc graph_update events {

	set el [split $events /]
	
	foreach e $el {
		scan $e "%d %d %g %g" src dst tim id

		# Draw and/or clear any points as needed.
		if { $src == 0 } {
			# data packet leaving node 0
			draw_data_pnt $tim $id

		} elseif { $dst == 0 } {
			# Ack packet leaving node 1 (to 0).  Just need to save
			# ack id. Point for ack will be drawn later when the
			# first data packet sent as a result of this ack leaves
			# node 0.
			draw_ack_pnt $tim $id
		}
		graph_update_interval $tim
	}
}

proc slidetime { tick remote } {
	global now range mintime trace
	set now [expr ($tick * $range) / 100. + $mintime]
	settime $now
	if { $remote } {
		peer_cmd 1 "slidetime $tick 0"
	}
}

proc bumpstepper { amt remote } {
	set v [.right.rate get]
	incr v [expr - $amt]
	if { $v > 100 } {
		.right.rate set 100
	} {
		if { $v < 0 } {
			.right.rate set 0
		} {
			.right.rate set $v
		}
	}
	if { $remote } {
		peer_cmd 1 "bumpstepper $amt 0"
	}
}

proc renderFrame { } {
	global running sliderPressed granularity
	if { $running && !$sliderPressed } {
		nextFrame
		update idletasks
		after $granularity renderFrame
	}
}

proc remote_play t {
        global timeSlider
        settime $t
        play 0
}

proc play remote {
	global running now
	set running 1
	after 0 renderFrame
	if { $remote } {
		peer_cmd 1 "remote_play $now"
	}
}

proc remote_stop t {
        stop 0
        settime $t
}

proc stop remote {
	global running now
	set running 0
	if { $remote } {
		peer_cmd 1 "remote_stop $now"
	}
}

proc remote_set_time t {
        global timeSlider
        settime $t
}

proc reset { } {
	settime 0.
	peer_cmd 1 "remote_set_time 0."
}

proc rewind { } {
	global now timeStep
	set t [expr $now - $timeStep*25.0]
	settime $t
	peer_cmd 1 "remote_set_time $t"
#	settime 0.
#	peer_cmd 1 "remote_set_time 0."
}

proc fast_fwd { } {
	global now timeStep
        set t [expr $now + $timeStep*25.0]
        settime $t
	peer_cmd 1 "remote_set_time $t"
}

proc next_event { } {
	global trace running
	set t [$trace nxtevent]
	settime $t
	peer_cmd 1 "remote_set_time $t"
	if { !$running } {
		nextFrame
		peer_cmd 1 nextFrame
	}
}

proc step_format t {
	if { $t < 1e-3 } {
		return [format "%.1f" [expr $t * 1e6]]us
	} elseif { $t < 1. } {
		return [format "%.1f" [expr $t * 1e3]]ms
	}
	return [format "%.1f" $t]s
}

proc set_rate { v remote } {
	global timeStep stepDisp rateSlider currRate
	set timeStep [expr pow(10, $v / 10.)]
	set stepDisp [step_format $timeStep]
        if { [$rateSlider get] != $v } { $rateSlider set $v }
	set currRate $v
	if { $remote } {
		peer_cmd 1 "set_rate $v 0"
	}
}

# Set time to its previous value (before it was changed by
# pressing mouse button 1 on the time slider).
proc time_undo { } {
        global timeSlider prevTime now
        set currTime $now
        settime $prevTime
	peer_cmd 1 "settime $prevTime"
        set prevTime $currTime
}

# Set rate to its previous value (before it was changed by
# pressing mouse button 1 on the rate slider).
proc rate_undo { } {
        global prevRate rateSlider
        set tmpRate [$rateSlider get]
        set_rate $prevRate 1
        $rateSlider set $prevRate
        set prevRate $tmpRate
}

proc button_release_1 t {
        global timeSlider
	slidetime $t 1
        $timeSlider set $t
	global sliderPressed
	set sliderPressed 0
}

proc button_press_1 s {
	global sliderPressed prevTime
	set sliderPressed 1
        set prevTime $s
}

proc build.p0 w {
	scale $w.slider -orient horizontal -width 7p \
			-from 0 -to 100 -showvalue false -relief groove \
			-borderwidth 1

	#
	# We want slightly different semantics.  Instead of tracking
	# the time slider continuously, we just update it when the
	# button is released.
	# E.g., it takes too long to do a fast-forward each time.
	#
	global timeSlider 
	set timeSlider $w.slider
	bind $timeSlider <ButtonRelease-1> {
	        set t [%W get]
		slidetime $t 1
		global sliderPressed running
		set sliderPressed 0
		peer_cmd 1 "button_release_1 $t"
		if $running {
			renderFrame
		}
	}
	bind $timeSlider <ButtonPress-1> {
		global sliderPressed prevTime
		set sliderPressed 1
	        set prevTime $now
		peer_cmd 1 "button_press_1 $prevTime"
	}
	bind $timeSlider <B1-Motion> {
		global range mintime trace nowDisp
		set tick [%W get]
		set now [expr ($tick * $range) / 100. + $mintime]
		set nowDisp [format %%.6f $now]
	}

#	button $w.rew -bitmap rewind \
#		-command rewind -anchor center -relief ridge
#	button $w.stop -bitmap stop \
#		-command stop -anchor center -relief ridge
#	button $w.idle -bitmap play \
#			-command play -anchor center -relief ridge
#	button $w.ff -bitmap "ff" \
#			-command fast_fwd -anchor center -relief ridge

	pack $w.slider -side left -fill x -expand 1
#	pack $w.rew $w.stop $w.idle $w.ff -side left
}

proc build.p1 w {
	set f [smallfont]
	frame $w.bar -relief ridge -borderwidth 2
	label $w.bar.title -text "   LBL Network Animator v[version]" \
		-anchor w -font $f -borderwidth 1
#	label $w.bar.timer -text Time: -font $f -borderwidth 1
	label $w.bar.timerVal -textvariable nowDisp -width 10 -anchor w -font $f \
		-borderwidth 1 -relief groove -anchor e
#	label $v.step -text "  Step:" -font $f -borderwidth 1
	label $w.bar.stepVal -textvariable stepDisp -width 8 -anchor w -font $f \
		-borderwidth 1 -relief groove -anchor e

	pack $w.bar.title -side left -fill x -expand 1
	pack $w.bar.timerVal $w.bar.stepVal -side left -pady 1 \
		-ipady 1 -padx 1 -padx 1

#	button $w.help -text Help -borderwidth 2 -relief raised \
#		-font $f -command "toggle_window .help" -width 5

	checkbutton $w.bar.run -text Run -borderwidth 1 -relief raised \
		-highlightthickness 1 -font $f -variable running \
		-command renderFrame

	button $w.bar.rew -text Rew -borderwidth 1 -relief raised \
		-highlightthickness 1 -font $f -command rewind

	button $w.bar.quit -text Quit -borderwidth 1 -relief raised \
		-highlightthickness 1 -font $f -command done


	pack $w.bar.run $w.bar.rew $w.bar.quit -side left \
		-padx 1 -pady 1 -ipadx 2
#	pack $w.bar.run -side left -padx 1 -pady 1
	pack $w.bar -fill x
}

proc back_step { } {
        global running
        if $running { stop 1 }
	backFrame
	peer_cmd 1 backFrame
}

proc toggle_pause { } {
        global running
        if $running {
		stop 1
	} else {
		play 1
	}
}

proc single_step { } {
        global running
        if $running { stop 1 }
        nextFrame
	peer_cmd 1 nextFrame
}

proc dead name {
	global peers
	set i [lsearch -exact $peers $name]
	set peers [lreplace $peers $i $i]
}

proc done { } {
        peer_cmd 1 "dead \"[winfo name .]\""
#	peer_cmd 1 "destroy ."
#	tkgraph_cmd 1 "destroy ."
        destroy .
}

proc all_done { } {
	peer_cmd 1 "destroy ."
	tkgraph_cmd 1 "destroy ."
	destroy .
}

proc remote_change_rate r {
        global timeStep stepDisp
        set timeStep $r
        set stepDisp [step_format $r]
}

proc change_rate inc {
        global timeStep stepDisp
        if $inc {
	        set timeStep [expr $timeStep + $timeStep*0.05]
	} else {
	        set timeStep [expr $timeStep - $timeStep*0.05]
	}	    
        set stepDisp [step_format $timeStep]
	peer_cmd 1 "remote_change_rate $timeStep"
}

proc start_info { x y } {
	global running resume nowDisp netView
	if $running {
	        set resume 1 
        } else {
	        set resume 0
	}
	stop 1
	set text [$netView info $nowDisp]
	if { [string length $text] > 0 } {
		message $netView.msg -width 8c -text $text
		place $netView.msg -x $x -y $y
	}
}

proc end_info {} { 
        global resume netView
	catch { destroy $netView.msg }
        if $resume { play 1 }
}

proc graph_init graphInput {
	global prevAckId prevPktId interval intervalStart intervalEnd range \
	       clearDataCmd graphName delay01 graphTool
	set prevAckId 0
	set prevPktId 0
	set delay01 0
	set clearDataCmd ""
	set intervalStart 0.0
	set intervalEnd [expr $intervalStart + $interval]
	exec tkgraph $graphInput &
	after 1000
	set interps [winfo interps]
	foreach i $interps {
		if [regexp ^tkgraph* $i] {
			after 1000
			set graphTool $i
			set graphName [send $i {graph_name}]
			tkgraph_cmd 0 \
			  "update_graph $graphName $intervalStart $intervalEnd"
			break
		}
	}
}

proc tkgraph_cmd { async cmd } {
	global graphName graphTool
	if { [string length $graphName] > 0 } {
		remote_cmd $async $graphTool $cmd
	}
}
proc remote_cmd { async interp cmd } {
	if $async {
		set rcmd "send -async \"$interp\" {$cmd}"
	} else {
		set rcmd "send \"$interp\" {$cmd}"
	}
	eval $rcmd
}

#proc master_cmd { async cmd } {
#	global master
#	if { [llength $master] > 0 } {
#		remote_cmd $async $master $cmd
#	}
#}

proc peer_cmd { async cmd } {
	global peers
	foreach s $peers {
		remote_cmd $async $s $cmd
	}
}

proc peer_init name {
	peer $name 0
	peer_cmd 0 "peer \"[winfo name .]\" 1"
}

proc peer { name remote } {
	global peers
	if { $remote } {
		peer_cmd 1 "peer \"$name\" 0"
		foreach s $peers {
			remote_cmd 1 $name "peer \"$s\" 0"
		}
	}
	lappend peers $name
}

# nam_init trace-name [g=graph-input] [i=graph-interval]
# where trace-name is the nam trace input file
#       graph-input is the input tcl file to tkgraph (optional)
#       graph-interval is the graph interval to be used (optional)
#                      and is only meaningful when a graph input file
#                      is provided
proc nam_init { tracefile args } {
	. configure -background [option get . background Nam]

	global trace now mintime range maxtime timeStep prevTime prevRate \
               rateSlider netView netModel currRate graphName \
	       interval running peers peerName granularity
	set netModel [new NetworkModel]
	set trace [new NamTrace $tracefile]
	set now [$trace mintime]
	set mintime $now
        set maxtime [expr [$trace maxtime] + .05]
	set range [expr $maxtime - $mintime]
        set prevTime $mintime
	$trace connect $netModel

	frame .view
	nam_config $netModel
	$netModel layout
	$netModel view .view.net
        set netView .view.net
	set running 0

	set interval [expr $range / 7.]
	set graphName ""
	set graphInput ""
	set peerName ""
	set peers ""
	set i 0
	foreach a $args {
		set x [lindex $args [expr $i+1]]
		set aa [split $a "="]
		set pn [format "%s %s" [lindex $aa 1] $x]
		switch [lindex $aa 0] {
			g {set graphInput [lindex $aa 1]}
			i {set interval [lindex $aa 1]}
			p {
				if {[string length $x] > 0} {
					set peerName $pn
				} else {
					set peerName [lindex $aa 1]
				}
			}
		}
		incr i
	}

	if { [llength $graphInput] > 0 } {
		graph_init $graphInput
	}
	if { [llength $peerName] > 0 } {
		peer_init $peerName
	}

	scale .view.rate -orient vertical -width 7p \
			-from 1 -to -60 -showvalue false \
			-relief groove
        set rateSlider .view.rate
	set granularity [option get . granularity Nam]
	set timeStep [time2real [option get . rate Nam]]
        set currRate [expr 10*log10($timeStep)]
        set prevRate $currRate
	$rateSlider set $currRate

	pack .view.net -side left -expand 1 -fill both
	pack .view.rate -side left -fill y
	
        bind $rateSlider <ButtonRelease-1> { 
		set v [%W get]
		set_rate $v 1
	}
	bind $rateSlider <ButtonPress-1> {
		global currRate prevRate
		set prevRate $currRate
	}
	bind $rateSlider <B1-Motion> {
		global timeStep stepDisp
		set v [%W get]
		set timeStep [expr pow(10, $v / 10.)]
		set stepDisp [step_format $timeStep]
	}
	
	frame .ctrl -relief flat -borderwidth 0
	frame .ctrl.p0 -relief flat -borderwidth 0
	build.p0 .ctrl.p0
	frame .ctrl.p1 -relief flat -borderwidth 0
	build.p1 .ctrl.p1

	pack .ctrl.p0 .ctrl.p1 -side top -fill x
	pack .view -fill both -expand 1
	pack .ctrl -fill x

	wm minsize . 200 200

	settime $now
	set_rate $currRate 1
	
        bind . <q> { done }
	bind . <Q> { all_done }
	bind . <Control-c> { done }
	bind . <Control-d> { done }

	bind . <space> { toggle_pause }
	bind . <Return> { single_step }
        bind . <b> { back_step }
        bind . <B> { back_step }
	bind . <BackSpace> { back_step }
	bind . <Delete> { back_step }

	bind .view.net <ButtonPress-3> { start_info %x %y }
	bind .view.net <ButtonRelease-3> { end_info }

	bind . <0> { reset }
	bind . <c> { play 1 }
	bind . <C> { play 1 }
	bind . <f> { fast_fwd }
	bind . <F> { fast_fwd }
	bind . <n> { next_event }
	bind . <N> { next_event }
	bind . <p> { stop 1 }
	bind . <P> { stop 1 }
	bind . <r> { rewind }
	bind . <R> { rewind }
	bind . <u> { time_undo }
	bind . <U> { time_undo }
	bind . <x> { rate_undo }
	bind . <X> { rate_undo }
	bind . <period> { change_rate 1 }
	bind . <greater> { change_rate 1 }
	bind . <comma> { change_rate 0 }
	bind . <less> { change_rate 0 }
}


set helpno 0
proc helpitem { w text } {
	global helpno
	set f [option get . helpFont Nam]
	set h $w.h$helpno
	incr helpno
	frame $h
	canvas $h.bullet -width 12 -height 12 
	$h.bullet create oval 6 3 12 9 -fill black
	message $h.msg -justify left -anchor w -font $f -width 460 -text $text
	pack $h.bullet -side left -anchor ne -pady 5
	pack $h.msg -side left -expand 1 -fill x -anchor nw
	pack $h -expand 1 -fill both
}

proc build.help { } {
	set w .help
	if [winfo exists $w] { return }
	toplevel $w
	bind $w <Enter> "focus $w"
	wm withdraw $w
	wm iconname $w "nam help"
	wm title $w "nam help"

	frame $w.frame -borderwidth 2 -relief raised
	set p $w.frame
	helpitem $p "Sorry, nothing here yet."

	button $w.frame.ok -text " Dismiss " -borderwidth 2 -relief raised \
		-command "wm withdraw $w" -font [mediumfont] 
	pack $w.frame.ok -pady 6 -padx 6 -anchor e

	pack $w.frame -expand 1 -fill both
}

#
# helper functions
#
proc nam_angle { v } {
	switch $v {
		up-right -
		right-up	{ return 0.25 }
		up		{ return 0.5 }
		up-left -
		left-up		{ return 0.75 }
		left		{ return 1. }
		left-down -
		down-left	{ return 1.25 }
		down		{ return 1.5 }
		down-right -
		right-down	{ return 1.75 }
		default		{ return 0.0 }
	}
}

proc mklink { net n0 n1 bandwidth delay angle } {
	global delay01
	set th [nam_angle $angle]
	set result [$net link $n0 $n1 \
			[bw2real $bandwidth]  [time2real $delay] $th]
	$net link $n1 $n0 \
		[bw2real $bandwidth] [time2real $delay] [expr $th + 1]
	if { $n0 == 0 && $n1 == 1 } {
		set delay01 $result
	}
}

proc asym-mklink { net n0 n1 bandwidth1 delay1 bandwidth2 delay2 angle } {
	global delay01
	set th [nam_angle $angle]
	set result [$net link $n0 $n1 \
			[bw2real $bandwidth1]  [time2real $delay1] $th]
	$net link $n1 $n0 \
		[bw2real $bandwidth2] [time2real $delay2] [expr $th + 1]
	if { $n0 == 0 && $n1 == 1 } {
		set delay01 $result
	}
}

proc mklinkq { net n0 n1 bandwidth delay angle } {
	mklink $net $n0 $n1 $bandwidth $delay $angle
	$net queue $n0 $n1 0.5
	$net queue $n1 $n0 0.5
}

proc ncolor {n0 color} {
	global netModel
	$netModel ncolor $n0 $color
}

proc ecolor {n0 n1 color} {
	global netModel
	$netModel ecolor $n0 $n1 $color
	$netModel ecolor $n1 $n0 $color
}