Cowboys 5

require 'gosu'

class Player
  attr_reader :x
  attr_reader :y
  def initialize
    @sprite = Gosu::Image.new("cowboy.png")
    @x = 128
    @y = 128
  end

  def x=(new_x)
    @x =[[0, new_x].max,640-@sprite.width].min #stops player going off edge of screen
  end

  def y=(new_y)
    @y =[[0, new_y].max,480-@sprite.height].min #stops player going off edge of screen
  end
  def draw
    @sprite.draw(@x,@y,3)
  end
end

class Bullet
  attr_accessor :x
  attr_accessor :y
  def initialize(x, y)
    @x = x
    @y = y
    @sprite = Gosu::Image.new("bullet.png")
  end
  def draw
    @sprite.draw(@x, @y, 2)
  end
  def update
    @x += 4
  end
end

class GameWindow < Gosu::Window
  def initialize
    super 640,480
    self.caption = 'Cowboys 5'

    @bg_image = Gosu::Image.new("grassy.png", tileable: true)
    @player = Player.new
    @bullets = []
    @gun_ready = true
  end

  def update
    if Gosu::button_down? Gosu::KbLeft then
      @player.x -= 2
    end
    if Gosu::button_down? Gosu::KbRight then
      @player.x += 2
    end
    if Gosu::button_down? Gosu::KbUp then
      @player.y -= 2
    end
    if Gosu::button_down? Gosu::KbDown then
      @player.y += 2
    end
    if Gosu::button_down?(Gosu::KbSpace) then
      if @gun_ready
        @bullets.push Bullet.new(@player.x+50, @player.y+26)
        @gun_ready = false
      end
    else
      @gun_ready = true
    end
    @bullets.delete_if do |bullet|
      bullet.update
      if bullet.x > 640
        true
      end
    end
  end

  def draw
    @bullets.each do |bullet|
      bullet.draw
    end
    @player.draw
    @bg_image.draw(0,0,0)
    self.caption = @bullets.size
  end
end

window = GameWindow.new
window.show