```look: I study C/C++ in the college, but Ruby I study by myself, I want
to write a first course program in Ruby(it was a C code of a shell
trajectory, launched by user's speed and angle). I've already written
the program in Ruby, it calculates the shell position at every period of
time.The output looks like

give angle(degrees):
45
give speed(km/h)
150
0.785398163397448
flight trajectory:
x=106.066017177982  y=101.166017177982
x=212.132034355964  y=192.532034355964
x=318.198051533946  y=274.098051533946
x=424.264068711928  y=345.864068711929
x=530.330085889911  y=407.830085889911
x=636.396103067893  y=459.996103067893
x=742.462120245875  y=502.362120245875
x=848.528137423857  y=534.928137423857
x=954.594154601839  y=557.694154601839
x=1060.66017177982  y=570.660171779821
x=1166.7261889578  y=573.826188957803
x=1272.79220613579  y=567.192206135786
x=1378.85822331377  y=550.758223313768
x=1484.92424049175  y=524.52424049175
x=1590.99025766973  y=488.490257669732
x=1697.05627484771  y=442.656274847714
x=1803.1222920257  y=387.022292025696
x=1909.18830920368  y=321.588309203678
x=2015.25432638166  y=246.35432638166
x=2121.32034355964  y=161.320343559642
x=2227.38636073762  y=66.4863607376246
x=2333.45237791561  y=-38.1476220843933

ok, now I need to make it "alive". In C/C++ I can, but in Ruby, I have
no idea.
Therefore I need a piece of code which creates a window and point a
ball(it will be the shell). Any ideas?
--
Posted via http://www.ruby-forum.com/.

```