# Define colors called "white", "red", "green", "blue", and "black"
COLOR white 255 255 255
COLOR red 255 0 0
COLOR green 0 255 0
COLOR blue 0 0 255
COLOR black 0 0 0

GRADIENT blue2red 0 0 255 255 0 0

# Draw the background
PEN white 1 no 
RECT 0 0 1 1

# Draw the US map (black border lines)
REGION usa 0.0 0.28 1.0 0.72 -134 50 -57 24.5 
PEN black 1 yes 
PLOT usa gis/us_state.dat

# Pre-load ZIP data 
ZIP gis/zip_location.dat

# Paint background color "green" for Indiana
# with any zip code within the state (e.g. 47405)
FILL_AREA usa z:47405 green

# Define nodes on specific locations using zip codes
ABS_NODE red red 30 usa z:02114 #Harvard Univ
ABS_NODE red red 20 usa z:94103 #UNIV CALIF SAN FRANCISCO
# Draw the nodes
# size 0 by default to prevent from drawing nodes for past locations
DRAW_LOC red red 0 0 

# Define a path (edge)
ABS_PATH 1 1 blue2red 3 usa z:02114 z:94103
# Draw the path (edge)
PEN blue2red 2 no
DRAW_PATH blue2red 0 0

# Pre-load label fonts
FONT label font/font.ttf

# Define labels
# DR: bottom right; UL: upper left;
LABEL usa z:02114 DR HARVARD UNIV
LABEL usa z:94103 UL UNIV CALIF SF
# Draw the labels
PEN blue 1 yes
DRAW_LABEL label 0.02 blue