gistfile1.rb

#!/usr/bin/env ruby

require 'bundler/setup'
require 'c64'
require 'c64/prototype'

class BallTest < C64::Prototype

  border :black
  screen :white

  framedump :path => 'tmp', :count => 128

  def init
    @data = File.read('data.bin').bytes[2..-1]
    @dpos = 0
  end

  def draw
    while @data[@dpos] != 0xFF
      x1, y1, x2, y2, x3, y3, x4, y4 = @data[@dpos, 8]
      x1 &= 0x7F
      points = [[x1, y1], [x2, y2], [x3, y3]]
      points << [x4, y4] if x4 < 0x80
      polygon :points => points.map {|x, y| [x + 96, y + 36]}, :fill => :red
      @dpos += 2 * points.size
    end
    @dpos = (@dpos + 1) % @data.size
  end

end

BallTest.run

Needs a Gemfile including the following line:

gem 'c64-ruby', :github => 'lhz/c64-ruby'