whack_a_ruby.rb

require 'gosu'

class WhackARuby < Gosu::Window
  
  def initialize
    super(800,600)
    self.caption = 'Whack the Ruby'
    @image = Gosu::Image.new('ruby.png')
    @x = 200
    @y = 200
    @width = 50
    @height= 43
    @velocity_x = 5
    @velocity_y = 5
    @visible = 0
    @hammer_image = Gosu::Image.new('hammer.png')
    @hit = 0
    @font = Gosu::Font.new(30)
    @score = 0
    @playing = true
    @start_time = 0
  end
  
  def update
    if @playing
     @x += @velocity_x
     @y += @velocity_y
     @velocity_x *= -1 if @x + @width / 2 > 800 || @x - @width / 2 < 0
     @velocity_y *= -1 if @y + @height / 2 > 600 || @y - @height / 2 < 0
     @visible -= 1
     @visible = 30 if @visible < -10 && rand < 0.01
     @time_left = (100 - ((Gosu.milliseconds - @start_time) / 1000))
     @playing = false if @time_left < 0
    end
  end

  def draw
    if @visible > 0
      @image.draw( @x - @width / 2, @y - @height / 2, 1)
    end
    @hammer_image.draw(mouse_x - 40, mouse_y - 10, 1)
   if @hit == 0
     c = Gosu::Color::NONE
   elsif
    @hit == 1
    c = Gosu::Color::GREEN
   elsif
     @hit == -1
     c = Gosu::Color::RED
   end
    draw_quad(0, 0, c, 800, 0, c, 800, 600, c, 0, 600, c)
    @hit = 0
    @font.draw(@score.to_s, 700, 20, 2)
    @font.draw(@time_left.to_s,20,20, 2)
    unless @playing
      @font.draw('Game Over', 300,300, 3)
      @font.draw('Press the Space Bar to Play Again', 175, 350, 3)
      @visible = 20
    end
  end

def button_down(id)
  if @playing
    if (id == Gosu::MsLeft)
      if Gosu.distance(mouse_x, mouse_y,@x, @y) < 50 && @visible >= 0
        @hit = 1
        @score += 5
      else
        @hit = -1
        @score -= 1
      end
    end
  else
    if (id == Gosu::KbSpace)
      @playing = true
      @visible = -10
      @start_time = Gosu.milliseconds
      @score = 0
    end
  end
end


end
window = WhackARuby.new
window.show