class Noise

Public Class Methods

new(width, height, grain) click to toggle source
Calls superclass method Map::new
# File lib/delve/generator/noise.rb, line 11
def initialize width, height, grain
  raise 'Cannot initialize noise generator when width is less than zero' if width < 0
  raise 'Cannot initialize noise generator when height is less than zero' if height < 0
  raise 'Cannot initialize noise generator when grain is not defined' unless grain
  raise 'Cannot initialize noise generator with unknown grain' unless @@grains.include?(grain)

  super width, height

  @grain = @@grains[grain]
  @inverse = 1/@grain
end

Public Instance Methods

generate() { |x| ... } click to toggle source
# File lib/delve/generator/noise.rb, line 23
def generate
  noise = Perlin::Noise.new 2

  0.step((@width-1) * @grain, @grain) do |x|
    0.step((@height-1) * @grain, @grain).each do |y|
      yield(x*@inverse, y*@inverse, noise[x, y])
    end
  end
end