# title:   moveball
# author:  mieki256
# desc:    short description
# site:    website link
# license: MIT License (change this to your license of choice)
# version: 0.1
# script:  ruby

class Ball

  def initialize(x, y, scrw, scrh)
    @id = 1+2*(rand*6).to_i
    @x = x
    @y = y
    @scrw = scrw
    @scrh = scrh
    ang = rand(360)
    spd = 0.4 * scrw / 60.0
    a = ang * Math::PI / 180.0
    @dx = spd * Math.cos(a)
    @dy = spd * Math.sin(a)
  end
  
  def update
    @x += @dx
    @y += @dy
    @dx *= -1 if (@x <= 0 or @x >= @scrw - 16)
    @dy *= -1 if (@y <= 0 or @y >= @scrh - 16)
  end
  
  def draw
    spr @id,@x,@y,0,1,0,0,2,2
  end
  
end

$scrw, $scrh = 240, 136
$t = 0

# init objs
$objs = []
n = 80
n.times do |i|
  o = Ball.new($scrw/2, $scrh/2, $scrw, $scrh)
  $objs.push(o)
end

# main loop
def TIC
  
  # update
  $objs.each {|o| o.update}
  
  # draw
  cls 0
  $objs.each_with_index {|o,i| o.draw}

  print "mruby: #{RUBY_VERSION}",4,8*1,12
  print "count: #{$t}",4,8*2,12
  print ($t.div(60)).to_s+" sec",4,8*3,12
  $t+=1
end