From: Teodor Carstea <teodorcarstea@...>
Date: 2009-12-04T22:37:36+09:00
Subject: Graphics mode again

>Hi, all! here is my prog: it calculates the trajectory of a cannon shell:

puts "  give angle(degrees): "
  angle = gets
puts "  give speed(km/h)"
  speed = gets
puts "  convert degrees to radian: "
  angle = angle.to_f * ((Math::PI)/180)
puts angle.to_s
#sticking da speed to axes:
  xspeed = speed.to_f * Math.sin(angle.to_f)
  yspeed = speed.to_f * Math.cos(angle.to_f)

  time = 0
  y=8
puts "  flight trajectory: "
while y>0 do
  time += 1
  x = xspeed * time
  y = yspeed * time-4.9*time**2
  puts "x="+x.to_s+"  y="+y.to_s
end

>this is the output if speed=45km/h and angle=45 degrees

  give angle(degrees):
45
  give speed(km/h)
45
  convert degrees to radian:
0.785398163397448
  flight trajectory:
x=31.8198051533946  y=26.9198051533946
x=63.6396103067893  y=44.0396103067893
x=95.4594154601839  y=51.3594154601839
x=127.279220613579  y=48.8792206135786
x=159.099025766973  y=36.5990257669732
x=190.918830920368  y=14.5188309203678
x=222.738636073762  y=-17.3613639262375

>help me to see it, I mean, a graphic application (or console application), or >whatever... I want to see a shell flying on the screen. I am able to do it in 
>C++, but I wanna make it in Ruby, how can I use graphics mode?  
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