Dreaming of a Ruby Christmas (#187)

Ruby
1

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The three rules of Ruby Q. 2:

… no rules this week! …

Suggestion: A [QUIZ] in the subject of emails about the problem
helps everyone on Ruby T. follow the discussion. Please reply to
the original quiz message, if you can.

Note: I will be out and away for approximately two weeks, so don’t
expect to see this quiz summarized and a new quiz available until
either Jan 2nd or 9th.

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Dreaming of a Ruby Christmas (#187)

It’s six more days of Advent, and then… Christmas! Your task is to
create a Ruby script that celebrates Christmas. Create a virtual,
ASCII Christmas tree completely with blinking lights. Or a countdown
calendar 'til December 25th. Or a script that generates the lyrics to
The Twelve Days of Christmas. Or whatever you like: some Christmas
creativity.

And… Merry Christmas and a Happy New Year!!!

…

P.S. Yes, I’m politically-incorrect. That said, if you’d rather
celebrate Hanukkah, Kwanzaa, New Year’s or another holiday using Ruby
script, please do!

2

Happy holidays, everyone!

Here’s mine, it takes the New Years countdown to the next level and will
start
counting down from whatever time you run it. Once it counts down to
zero, it
says “Happy New Year!” and stops.

For example:
1,046,667!
1,046,666!
1,046,665!
…
3!
2!
1!
Happy New Year!

class Integer
def commafy
n = self.to_s.reverse
n.gsub!(/(\d\d\d)(?=\d)(?!\d*.)/){ $1 + ‘,’ }
n.reverse!
end
end

last = 0

begin
new_years = Time.local(Time.now.year+1,“jan”,1,0,0,0).to_i
now = Time.now.to_i

cur = new_years - now
puts cur.commafy + “!” if (cur != last)
last = cur
end while now != new_years

puts “Happy New Year!”

3

Matthew M. wrote:

Whenever I wrap Matzmas presents the wrapping turns out extremely
lumpy, crinkly, and stuck with gobs of tape everywhere, and the
contents are always disappointing. This script is no exception.

Take the stuff between the ‘----- cut here -----’ lines and save it in
a file, e.g. ‘matzmas.rb’. Feed it to ruby, e.g., ‘ruby matzmas.rb’.

Please don’t try to learn anything from this code!

  • Glen

----- cut here -----

            ###  M E R R Y   M A T Z M A S  ###

                          "/|"\
                      "/wl)e";eval(\
                         "A | A"\
                        "A  |  A"\
                            \
                         "InHhL"\
                        ",Z,%w{-"\
                       ",Y&/LH,L*"\
                      "cCnd,Hh&/d,"\
                     "YCB/Hh,Y&YHh,"\
                    "L&xHh,L*v*nHh,*"\
                   "&ghHh,n&nHh,H*nHh"\
                  ",*q*v*nHh,Hw*qv*Hh}"\
                 "Iq&n*L,Z,[,n&qK,n&qK,"\
                "@TwC,LH/&ng,gLBbL@K,@Th"\
               "/**,YC/k*d,Hh/*QdL@K,@FCB"\
              "/,cQqq&ng,=/CcL@K,@F&v*,RBb"\
             "y,g*mL!@K,@S&x,mQ/LhQqL,dBm=&"\
            "ng@K,@S*v*n,dBckL,Q-Hy=&ng@K,@E"\
           "&ghH,d&/L,Q-gqCbb&ng@K,@N&n*,/Qng"\
          "*L,LH*==&ng@K,@T*n,H/yL,Q-cQHch&ng@"\
         "K,@Eq*v*n,&CL,=&=&ng@K,@Tw*qv*,mCnk*y"\
        "L,=QHch&ng@,]IDAJJA2)J*Qch,dC,U&UI=/&nH"\
       ",@\nOn,Hh*,\#{nHhL[&]},dQy,CY,MQHzmQL,my,"\
      "H/B*,qCv*,gQv*,HC,m*:\n@I&JdCwnHCD2),dC,UjU"\
     "I=/&nH,@,,,\#{q&n*L[j]}\n@I*ndI=/&nHDD&,ZZ,A)"\
                         "?,@,,"\
                         ",G@,:"\
                         ",@,,,"\
                         "Gnd,Q"\
                         "@)I=/"\
           "&nH,@,n*w,v*/L&Cn,CY,RBby!\n@I*nd"\
            "I".tr(' ID/VHLYGBqCA&|*UQJ=Z@K,',
              '+;(r/tsfAulo1i8e|a.p=", '))

----- cut here -----

4

I feel compelled to express my sheer amazement. Thank you, Glen, you
have made my holiday!

  • Josh
5

I agree, that’s v cool :slight_smile:

6

Hi, I was wondering about this expression and its siblings:

Math.sin(rand(2 * Math::PI))

The documentation
http://www.ruby-doc.org/core/classes/Kernel.html#M005977states that
rand(num) will pick a random integer between 0 and num.abs.to_i
(unless this is different in JRuby). Therefore, the only values that
can
come out of this expression are sin(0), sin(1), … sin(6) which are 0,
.841, .909, .141, -.757, -.960, and -.279 (of course these are different
for
cosine). Is it just the range -1<y<1? Would rand(2)-1 suffice? What
is
the significance of these numbers and doing rand(2pi) instead of
rand(6)?

I did enjoy seeing a JRuby solution, especially a GUI-based one. Kudos.

Thanks,
Dan

7

On Mon, Dec 22, 2008 at 7:27 PM, Daniel F. [email protected]
wrote:

cosine). Is it just the range -1<y<1? Would rand(2)-1 suffice? What is
the significance of these numbers and doing rand(2pi) instead of rand(6)?

No significance other than trying to finish before 1:00. :slight_smile: Maybe
I was thinking: sin(rand * 2 * PI? But, yeah rand * 2 - 1 would have
sufficed there.

Thanks.

8

On Mon, Dec 22, 2008 at 12:44 PM, [email protected] wrote:

On Fri, Dec 19, 2008 at 3:08 PM, Matthew M. [email protected] wrote:

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Dreaming of a Ruby Christmas (#187)

I doubt I will find time to do more with this, so Merry Christmas:

I did make a few modifications:

  • removed unnecessary require
  • removed unnecessary trig functions
  • changed background color to black
  • “animated” the star :slight_smile:
  • removed the snow :frowning:
    I never did get around to:
  • decorating the tree
  • putting presents under the tree

http://github.com/fjc/rubyquiz/tree/master/187

#!/usr/bin/env jruby
require ‘java’

JFrame = javax.swing.JFrame
JPanel = javax.swing.JPanel
Color = java.awt.Color

frame = JFrame.new(“Merry JRuby Christmas”)
frame.default_close_operation = JFrame::EXIT_ON_CLOSE
frame.set_size(300, 400)

frame.show

class RbMasTry < JPanel
def paintComponent(graphics)
super(graphics)

srand(@tree_seed ||= srand)
[
  [400, 150,  50, 125,  50, 400, 50,  50, 50],
  [300, 150, 200,  50, 200, 350,  0, 200,  0],
  [200, 150, 100,  75, 150, 250],
  [100, 150,  50, 100, 100, 150],
].each do |a|
  graphics.set_color(Color.new(*a[6..8])) if a[6]

  a[0].times do
    graphics.draw_line(a[1], a[2], a[3] + rand(a[4]), a[5])
  end
end
srand

graphics.set_color(Color.new(255, 255, 0))

360.times do
  graphics.draw_line(
    150, 50,
    150 + rand(25) * (rand * 2 - 1),
     50 + rand(25) * (rand * 2 - 1)
  )
end

end
end

tree = RbMasTry.new
tree.background = Color.new(0, 0, 0)
frame.add(tree)

loop do
tree.repaint
tree.revalidate
sleep 0.1
end

9

P.S. Yes, I’m politically-incorrect. That said, if you’d rather celebrate
Hanukkah, Kwanzaa, New Year’s or another holiday using Ruby script, please
do!
So I leave it to the user which message to display :wink:
I personally would chose

Health, Love and Peace for All on this World

But if you run my solution with this text you need some patience…

http://pastie.org/346680

Cheers
Robert

10

On Thu, Dec 25, 2008 at 5:35 PM, Robert D. [email protected]
wrote:

P.S. Yes, I’m politically-incorrect. That said, if you’d rather celebrate
Hanukkah, Kwanzaa, New Year’s or another holiday using Ruby script, please
do!
So I leave it to the user which message to display :wink:
I personally would chose

Health, Love and Peace for All on this World

But if you run my solution with this text you need some patience…
Well as I had to fix a bug, I made the random choice converging, now
we can have peace in less time :slight_smile:

http://pastie.org/346680

R.

11

On Fri, Dec 19, 2008 at 3:08 PM, Matthew M. [email protected] wrote:

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Dreaming of a Ruby Christmas (#187)

It’s six more days of Advent, and then… Christmas! Your task is to create
a Ruby script that celebrates Christmas. Create a virtual, ASCII Christmas
tree completely with blinking lights. Or a countdown calendar 'til December
25th. Or a script that generates the lyrics to The Twelve Days of
Christmas. Or whatever you like: some Christmas creativity.

And… Merry Christmas and a Happy New Year!!!

I doubt I will find time to do more with this, so Merry Christmas:

cat RbMasTry.rb
#!/usr/bin/env jruby
require ‘java’
require ‘mathn’

JFrame = javax.swing.JFrame
JPanel = javax.swing.JPanel
Color = java.awt.Color

frame = JFrame.new(“Merry JRuby Christmas”)
frame.default_close_operation = JFrame::EXIT_ON_CLOSE
frame.set_size(300, 400)

frame.show

class RbMasTry < JPanel
def paintComponent(graphics)
super(graphics)

[
  [400, 150,  50, 125,  50, 400,  50,  50,  50],
  [300, 150, 200,  50, 200, 350,   0, 200,   0],
  [200, 150, 100,  75, 150, 250],
  [100, 150,  50, 100, 100, 150],
].each do |a|
  graphics.set_color(Color.new(*a[6..8])) if a[6]

  a[0].times do
    graphics.draw_line(a[1], a[2], a[3] + rand(a[4]), a[5])
  end
end

graphics.set_color(Color.new(255, 255, 0))

360.times do
  graphics.draw_line(
    150, 50,
    150 + rand(25) * Math.sin(rand(2 * Math::PI)),
     50 + rand(25) * Math.cos(rand(2 * Math::PI))
  )
end

graphics.set_color(Color.new(255, 255, 255))

rand(90).times do
  x, y = rand(300), rand(400)
  rand(180).times do
    graphics.draw_line(
      x, y,
      x + rand(5) * Math.sin(rand(2 * Math::PI)),
      y + rand(5) * Math.cos(rand(2 * Math::PI))
    )
  end
end

end
end

tree = RbMasTry.new
frame.add(tree)
tree.repaint
tree.revalidate