mouse_info.rb

require 'rubygems'
require 'gosu'
include Gosu

class MouseInfo < Window 
  CENTER = 640/2
  BOTTOM = 480
  def initialize
    super(640, 480, false)
    @clicked = ""
    @font = Gosu::Font.new(self, Gosu::default_font_name, 20)
    @objects = []
  end
  
  def update
    @x, @y = mouse_x, mouse_y
    @objects.reject { |t| t.update == false }
  end

  def draw
    @font.draw_rel("X: #{mouse_x}", CENTER, 100, 1, 0.5, 0.5)
    @font.draw_rel("Y: #{mouse_y}", CENTER, 130, 1, 0.5, 0.5)
    @font.draw_rel("Clicked: #{@clicked}", CENTER, 150, 1, 0.5, 0.5)
    @objects.each { |o| o.draw }
  end
  
  def button_down(id)
    if id == Button::KbEscape then close end
    if id == Button::MsLeft then @objects << Missile.new(self, @x, @y, Gosu::angle(CENTER, BOTTOM, @x, @y)) end
  end
  
end
 
class Missile
   attr_accessor :end_x, :vx, :end_y, :vy, :window, :x, :y
  def initialize(window, end_x, end_y, angle)
    @vx, @vy = Gosu::offset_x(angle, 20).to_i, Gosu::offset_y(angle, 20).to_i
    @window, @end_x, @end_y = window, end_x, end_y
    @x, @y = 320, 480
    puts "x = #{@end_x} and y=#{@end_y} angle = #{angle}"
  end

  def update
    @x = @x + @vx
    @y = @y + @vy
    if (@y > 100 && @y < 480)
      false  
    else
      puts @y
      true
    end
  end

  def draw
    @window.draw_line(320, 480,0xffffffff, @x, @y, 0xffffffff)
  end

end
MouseInfo.new.show