#!/usr/bin/env ruby

require "GD"
        
# create a new image
im = GD::Image.new(100,100)

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

# make the background transparent and interlaced
im.transparent(white)
im.interlace = true

# Put a black frame around the picture
im.rectangle(0,0,99,99,black)

# Draw a blue oval
im.arc(50,50,95,75,0,360,blue)

# And fill it with red
im.fill(50,50,red)

# Convert the image to PNG and print it on standard output
im.png STDOUT