Some days ago I came across a post on the FM3 buddha machine. Finding it a fascinating concept, and being able to download their samples I sprinkled a few lines of ruby over them an stirred. Voilà – my own personal buddha machine playing wonderful ambient soundscapes in a random fashion. Using the sdl_ruby library, the whole thing became surprisingly simple:
#!/usr/bin/ruby -w
require 'sdl'
SDL.init(SDL::INIT_AUDIO)
SDL::Mixer.open(44100,SDL::Mixer::DEFAULT_FORMAT,2,4096)
clips = Dir.new('audio').entries.delete_if {|x| ! (x =~ /wav$/)}
while true
for i in 1..SDL::Mixer.allocate_channels(4)
if not SDL::Mixer.play?(i)
SDL::Mixer.playChannel(i,SDL::Mixer::Wave.load("audio/"+clips[rand(clips.length)]),rand(30))
end
end
sleep 0.5
end
Quick note on how to do numerical sorting in ruby.
When calling sort, ruby will perform a lexicographical sorting by default, meaning that the following array
1
2
| a=["0","10","9","1"]
a.sort.each{|val| p val} |
will output
"0"
"1"
"10"
"9"
If this is not what you want, this might be it:
1
| a.sort{|x,y| x.to_i < => y.to_i}.each { |val| p val } |
outputs:
"0"
"1"
"9"
"10"
Yay, blocks to the rescue:)
Av og til kommer man over småting i nye språk som er ganske kjekke: Class.inherited i ruby er en metode som kalles i superklassen til et arvet object, noe som gir muligheter til å gjøre ting som er kule. La meg tenke litt på det, så kommer det nok noen rare eksempler:)
[Rails] select-multiple for has_many association
Kort gjenfortalt :
< %= collection_select :person, :task_ids,
Task.find(:all), :id, :description, {},
:multiple => true,
:name => 'person[task_ids][]' %>
Acts As Dropdown er en rails-plugin som gjør det svært enkelt (og lesbart) å lage select-menyer. Får min foreløpige anbefaling:)