Last Updated: February 25, 2016

Random Bouncy particles using ruby

i'm exploring new ruby gems, so i found a gem called gosu, a game engine gem cross platform, i like it as it is really easy, check the code snippit below, i created a particle with some random behaviour and add 200 of them to the windows and let them behave as they want :)

require 'gosu'
$width, $height = 200, 200
$number_of_particles = 200

class Quad
 def initialize
 @pos = {x:rand($width), y:rand($width)}
 @vel = { x:(rand(5)+1)*[1,-1].sample, y:(rand(5)+1)*[1,-1].sample }
 @size = rand(4)*[1,-1].sample
 @color = [ Gosu::Color::GRAY, Gosu::Color::WHITE,
 Gosu::Color::AQUA, Gosu::Color::RED,
 Gosu::Color::GREEN, Gosu::Color::BLUE,
 Gosu::Color::YELLOW, Gosu::Color::FUCHSIA,
 Gosu::Color::CYAN ].sample
 end
 def update
 @vel[:x] = @vel[:x] * -1 if @pos[:x] <= 0 or @pos[:x] >= $width
 @vel[:y] = @vel[:y] * -1 if @pos[:y] <= 0 or @pos[:y] >= $height
 @pos[:x] += @vel[:x]
 @pos[:y] += @vel[:y] 
 end
 def draw win
 win.draw_quad @pos[:x]-@size, @pos[:y]-@size, @color,
 @pos[:x]+@size, @pos[:y]-@size, @color,
 @pos[:x]+@size, @pos[:y]+@size, @color,
 @pos[:x]-@size, @pos[:y]+@size, @color
 end
end

class GameWindow < Gosu::Window
 def initialize
 super $width, $height, false
 self.caption = "Quads"
 @quads = []
 $number_of_particles.times { @quads << Quad.new }
 end
 def update
 @quads.each {|q| q.update }
 end
 def draw
 color = Gosu::Color::WHITE
 draw_quad 0, 0, color, $width, 0, color, $width, $height, color, 0, $height, color
 @quads.each { |q| q.draw self }
 end
end

window = GameWindow.new
window.show

#ruby

#gosu

#rails

#gaming