Class: TrianglePattern::Grid

Inherits:
Object
  • Object
show all
Defined in:
lib/triangle_pattern/grid.rb

Instance Method Summary collapse

Constructor Details

#initialize(width, height, cell_size, variance, seed) ⇒ Grid

Returns a new instance of Grid.



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# File 'lib/triangle_pattern/grid.rb', line 4

def initialize(width, height, cell_size, variance, seed)
  @width = width
  @height = height
  @cell_size = cell_size
  @variance = variance
  @seed = seed
  @calc_variance = cell_size * variance / 2.to_f
  cells_x = ((@width + 4 * @cell_size) / @cell_size).floor
  cells_y = ((@height + 4 * @cell_size) / @cell_size).floor
  @bleed_x = ((cells_x * @cell_size) - width) / 2
  @bleed_y = ((cells_y * @cell_size) - height) / 2
end

Instance Method Details

#generate_grid ⇒ Object 



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# File 'lib/triangle_pattern/grid.rb', line 17

def generate_grid
  half_cell_size = (@cell_size / 2.to_f).round
  double_v = @calc_variance * 2
  negative_v = -@calc_variance
  grid = []
  prng1 = Random.new(@seed)
  h = @height + @bleed_y
  w = @width + @bleed_x
  i = -@bleed_x
  j = -@bleed_y
  (-@bleed_x..w-@bleed_x).step(@cell_size) do |i|
    (-@bleed_y..h-@bleed_x).step(@cell_size) do |j|
      x = (i + half_cell_size) + (prng1.rand * double_v + negative_v)
      y = (j + half_cell_size) + (prng1.rand * double_v + negative_v)
      grid << [x.floor, y.floor]
    end
  end
  grid
end