#! /usr/bin/env ruby
#
# gexebutton - a tool to create a flash-based sounding button
#
# Copyright (C) 2003-2004 Satoru Takabayashi <satoru@namazu.org> 
#     All rights reserved.
#     This is free software with ABSOLUTELY NO WARRANTY.
#
# You can redistribute it and/or modify it under the terms of 
# the GNU General Public License version 2.
#
require 'ming/ming'
include Ming

class GexeButtonCreator
  def initialize (released_filename, pressed_filename, mp3_filename)
    @released_bitmap = SWFBitmap.new(released_filename)
    @pressed_bitmap  = SWFBitmap.new(pressed_filename)
    @mp3_filename = mp3_filename

    @width  = @released_bitmap.get_width
    @height = @released_bitmap.get_height
    raise "image sizes unmatched" if @width != @pressed_bitmap.get_width or
      @height != @pressed_bitmap.get_height
  end
    
  def create_image (bitmap)
    shape = SWFShape.new
    shape.set_right_fill(shape.add_fill(bitmap))
    shape.draw_line(@width, 0)
    shape.draw_line(0, @height)
    shape.draw_line(-@width, 0)
    shape.draw_line(0, -@height)
    return shape
  end

  def create_anim (released_image, pressed_image)
    sprite = SWFSprite.new
    item = sprite.add(released_image)
    item = sprite.add(pressed_image)
    nframes = 4
    make_frame = lambda {|i|
      item.mult_color(1.0, 1.0, 1.0, i.to_f / nframes)
      sprite.next_frame
    }
    1.upto(nframes)   {|i| make_frame.call(i) }
    nframes.downto(1) {|i| make_frame.call(i) }
    return sprite
  end

  def create (flash_filename)
    movie = SWFMovie.new
    movie.set_dimension(@width, @height)
    movie.set_rate(30.0)

    released_image = create_image(@released_bitmap)
    pressed_image  = create_image(@pressed_bitmap)
    anim   = create_anim(released_image, pressed_image)

    button = SWFButton.new
    button.set_hit(released_image)
    button.set_up(released_image)
    button.set_over(released_image)
    button.set_down(anim)
    
    sound = movie.add_sound(@mp3_filename, 
                            SWFSOUND_MP3_COMPRESSED | SWFSOUND_44KHZ |
                            SWFSOUND_16BITS | SWFSOUND_STEREO)
    i = movie.add(button)
    # button, up, over, down, hit
    movie.set_button_sound(i, nil, nil, sound, nil)

    movie.save(flash_filename)
  end
end

def show_help
  puts "Usage: gexebutton RELEASED PRESSED MP3 FLASH"
  exit
end

def main
  show_help if ARGV.length != 4
  released_filename = ARGV[0]
  pressed_filename  = ARGV[1]
  mp3_filename      = ARGV[2]
  flash_filename    = ARGV[3]

  creator = GexeButtonCreator.new(released_filename,
                                  pressed_filename,
                                  mp3_filename)
  creator.create(flash_filename)
end

main