Created
December 20, 2012 10:25
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a derivative work from climagick's "Let It Snow In Your Terminal" (http://climagic.org/coolstuff/let-it-snow.html), see also https://gist.github.com/4344001
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| require 'set' | |
| rows,columns = `stty size`.scan(/\d+/).map{|x| x.to_i} | |
| # ruby 1.8.x compatible way to say "\u2743" | |
| Flake = ["2743".to_i(16)].pack("U*") | |
| # Shapes from far away to still closer | |
| Snow = ['.','*',Flake] | |
| # flake state descriptor | |
| FlakeState = Struct.new(:row, :speed, :shape) | |
| # this will map column to a flake [row, speed] | |
| snow_progress = {} | |
| # available columns (initially all columns are available) | |
| avail = Set.new 1..columns | |
| # clear terminal | |
| puts "\033[2J" | |
| # terminal positioning | |
| def char_at(char,row,col) ; "\033[#{row};#{col}H#{char}" ; end | |
| # infinite blizzard loop | |
| loop do | |
| # pick a random available column | |
| column = avail.to_a[ rand( avail.size ) ] | |
| # remove it from available columns | |
| avail.delete column | |
| # give a snowflake some random speed | |
| speed = rand( Snow.size )+1 | |
| # chose a shape based on speed | |
| shape = Snow[speed-1] | |
| # initialize this particular snowflake | |
| snow_progress[ column ] = FlakeState.new 0,speed,shape | |
| # loop over all active snowflakes (clone the hash so we can edit it as we go) | |
| snow_progress.clone.each do |column, flake| | |
| # clear previous snowflake image | |
| print char_at(' ',flake.row,column) if flake.row > 0 | |
| # update snowflake model | |
| flake.row += flake.speed | |
| # if still falling | |
| if flake.row < rows | |
| # draw its shape | |
| print char_at(flake.shape,flake.row,column) | |
| else | |
| # on the ground always draw the Flake | |
| print char_at(Flake,rows,column) | |
| # make its column available again | |
| avail << column | |
| # and remove the snowflake from simulation | |
| snow_progress.delete column | |
| end | |
| # move the terminal cursor away | |
| print char_at('',0,0) | |
| end | |
| # ruby 1.8.x buffers stdout by default, flush the current animation frame | |
| $stdout.flush | |
| # ~17 FPS | |
| sleep 0.06 | |
| end |
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