#!/usr/local/bin/ruby
#
# ./polygon_map.rb > polygon_map.gif

require "GD"

# create a new image
im = GD::Image.new(200, 200)

# allocate some colors
white = im.colorAllocate(255,255,255)
black = im.colorAllocate(0,0,0)
red = im.colorAllocate(255,0,0)
green = im.colorAllocate(0,255,0)
blue = im.colorAllocate(0,0,255)
yellow = im.colorAllocate(255,250,205)

poly = GD::Polygon.new
poly.addPt(100,50)
poly.addPt(50,100)
poly.addPt(150,100)
im.polygon(poly, blue)

poly.map(50, 50, 150, 100, 75, 100, 125, 150)
im.polygon(poly, red)

im.gif STDOUT