#!ruby -Ku
# -*- mode: ruby; coding: utf-8 -*-
# Last updated: <2017/04/18 21:28:17 +0900>
#
# tinypixelartgrad + gosu

require 'gosu'
require 'rmagick'
require_relative 'tinypixelartgrad'

class MyWindow < Gosu::Window

  WDW_W = 640
  WDW_H = 480

  def initialize
    super WDW_W, WDW_H, false
    self.caption = "TinyPixelartGrad + RMagick + gosu"

    @w = 64
    @h = @w
    @seed = 0
    @count = (WDW_W / (@w + 4)) * (WDW_H / (@h + 4))
    @imgs = generate_arts(@w, @h, @count, @seed)
    @seed += @count

    @update_arts = false
  end

  def generate_arts(w, h, count, seed)
    srand(seed)
    imgs = []
    count.times do |i|
      art = TinyPixelartGrad.new(w, h, seed + i)
      img = convert_image(w, h, art.surface)
      imgs.push(img)
    end
    return imgs
  end

  # convert cairo surface to Gosu::Image
  def convert_image(w, h, surface)
    mimg = Magick::Image.new(w, h)
    mimg.import_pixels(0, 0, w, h, "BGRA", surface.data)
    img = Gosu::Image.new(mimg, :tileable => true, :retro => true)
    return img
  end

  def update
    if @update_arts
      @imgs = generate_arts(@w, @h, @count, @seed)
      @seed += @count
      @update_arts = false
    end
  end

  def draw
    z = 0
    x, y = 0, 0
    @imgs.each do |img|
      img.draw(x, y, z)
      x += img.width + 4
      if x + img.width >= WDW_W
        y += img.height + 4
        x = 0
      end
    end
  end

  def button_up(id)
    if id == Gosu::KB_SPACE
      @update_arts = true
    end
  end

  def button_down(id)
    if id == Gosu::KB_ESCAPE
      close
    end
  end
end

w = MyWindow.new
w.show