movement_test.rb

require 'gosu'
FONT_COLOR = 0xff_ffff00

class SpaceInvader < Gosu::Window
  def initialize
    super 640, 480
    self.caption = "Space Invaders"
    @text_message = "Hello world"
    @message = Gosu::Font.new(20)
    @x = 300
    @y = 300
    @x_target = 500
    @yellow_square = Gosu::Image.new("invaders/media/yellow_square.png")
  end


  def update
    self.move
    close if Gosu::button_down?(Gosu::KbEscape)
  end

  def move
      @x += 3 unless self.collision?(640, @y)
  end

  def collision?(barrier_x, barrier_y)
       (barrier_x.between?(@x - 50, @x) and barrier_y.between?(@y, @y + 50)) || (barrier_x.between?(@x, @x + 50) && barrier_y.between?(@y - 50, @y)) || (barrier_x.between?(@x - 50, @x) &&  barrier_y.between?(@y - 50, @y)) || (barrier_x.between?(@x, @x + 50) && barrier_y.between?(@y, @y + 50))
  end

  def needs_cursor?
   true
  end



  def draw
    @yellow_square.draw_rot(@x, @y, 0, 0)
    @message.draw("X => #{@x} Y => #{@y}", 10, 30, FONT_COLOR)
    @message.draw("W => 640 - H => 480", 425, 30, FONT_COLOR)
    @message.draw("#{@x_target}, #{@x}", 10, 60, FONT_COLOR)
  end
end
window = SpaceInvader.new
window.show