png 120 120 hw1linewc.png

xyc 100.5 30.5  #000000
xyc 23 99       #000000

xyc 10.5 20.5   #000000
xyc 103 89      #000000

linewc 2 3 3 #000000
linewc 2 4 23.5 #ffffff

linewc 1 2 13.5 #0000ff
linewc 3 4 3.5 #00ff00

linewc 1 3 1 #ff0000
linewc 1 4 1.5 #ff0000