大家好，又见面了，我是全栈君，祝每个程序员都可以多学几门语言。
NS2 节点颜色设置在http://hi.baidu.com/jrwen0/item/d105c642f4c3ce36fb89601b说明的比較具体，大家能够參见。
我这里想说的是数据流颜色的设置，相信大家试过非常多次，没有效果。有线的我參看这这里http://www.cs.virginia.edu/~cs757/slidespdf/cs757-ns2-tutorial-exercise.pdf，执行了里面的example2.tcl,程序例如以下
#Create a simulator object
set ns [new Simulator]
#Define different colors for data flows
<span style="color:#ff0000;">$ns color 1 Blue
$ns color 2 Red</span>
#Open the nam trace file
set nf [open out.nam w]
$ns namtrace-all $nf
#Define a 'finish' procedure
proc finish {} {
global ns nf
$ns flush-trace
#Close the trace file
close $nf
#Execute nam on the trace file
exec nam –a out.nam &
exit 0
}
#Create four nodes
set n0 [$ns node]
set n1 [$ns node]
set n2 [$ns node]
set n3 [$ns node]
#Create links between the nodes
$ns duplex-link $n0 $n2 1Mb 10ms DropTail
$ns duplex-link $n1 $n2 1Mb 10ms DropTail
$ns duplex-link $n3 $n2 1Mb 10ms SFQ
$ns duplex-link-op $n0 $n2 orient right-down
$ns duplex-link-op $n1 $n2 orient right-up
$ns duplex-link-op $n2 $n3 orient right
#Monitor the queue for the link between node 2 and node 3
$ns duplex-link-op $n2 $n3 queuePos 0.5
#Create a UDP agent and attach it to node n0
<span style="color:#ff0000;">set udp0 [new Agent/UDP]
$udp0 set class_ 1</span>
$ns attach-agent $n0 $udp0
# Create a CBR traffic source and attach it to udp0
set cbr0 [new Application/Traffic/CBR]
$cbr0 set packetSize_ 500
$cbr0 set interval_ 0.005
$cbr0 attach-agent $udp0
#Create a UDP agent and attach it to node n1
<span style="background-color: rgb(255, 255, 255);"><span style="color:#ff0000;">set udp1 [new Agent/UDP]</span></span>
<span style="color:#ff0000;">$udp1 set class_ 2</span>
$ns attach-agent $n1 $udp1
# Create a CBR traffic source and attach it to udp1
set cbr1 [new Application/Traffic/CBR]
$cbr1 set packetSize_ 500
$cbr1 set interval_ 0.005
$cbr1 attach-agent $udp1
#Create a Null agent (a traffic sink) and attach it to node n3
set null0 [new Agent/Null]
$ns attach-agent $n3 $null0
#Connect the traffic sources with the traffic sink
$ns connect $udp0 $null0
$ns connect $udp1 $null0
#Schedule events for the CBR agents
$ns at 0.5 "$cbr0 start"
$ns at 1.0 "$cbr1 start"
$ns at 4.0 "$cbr1 stop"
$ns at 4.5 "$cbr0 stop"
#Call the finish procedure after 5 seconds of simulation time
$ns at 5.0 "finish"
#Run the simulation
$ns run
红色会数据流颜色设置，相信看了第一个链接，大家也看到移动节点设置须要在802.15.4的情况下才有颜色，可是我们移动环境下都用802.11，临时链接中给出的方法临时还无法解决这个问题。希望大家踊跃讨论问题的解决方法。
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