A sample script to demonstrate Ruby-SDL-FFI (as of June 21, 2009)

load_image.rb

#!/bin/env ruby

# A sample script to demonstrate Ruby-SDL-FFI (as of June 21, 2009).
# NOTE: Ruby-SDL-FFI API is still in flux.

require 'ruby-sdl-ffi'

path = ARGV[0]

if path.nil?
  puts "Usage: load_image.rb /path/to/image"
  exit 1
elsif not File.exist?( File.expand_path(path) )
  puts "Error: file doesn't exist: #{path}"
  exit 1
end

path = File.expand_path(path)

# Load the image file.
image = SDL::Surface.new( SDL::Image::IMG_Load( path ) )

# Create a new window the same size as the image.
screen = SDL::Surface.new( SDL::SDL_SetVideoMode(image.w, image.h, 0, 0) )

# Blit the image onto the screen surface.
SDL::SDL_BlitSurface( image, nil, screen, nil )

# Update the screen.
SDL::SDL_UpdateRect( screen, 0, 0, 0, 0 )

# Set the screen title to the filename of the image.
SDL::SDL_WM_SetCaption( File.basename(path), File.basename(path) )

# Pause while the user admires the image.
sleep 5