Class: MagicCloud::Layouter::Place

Inherits:
Object
  • Object
show all
Defined in:
lib/magic_cloud/layouter/place.rb

Overview

Incapsulating place lookup process

  1. find initial random place

  2. at each step, shift in spiral from the previous place

  3. always knows, if the place “ready” for shape (empty and inside board)

Instance Method Summary collapse

Constructor Details

#initialize(layouter, shape) ⇒ Place 



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# File 'lib/magic_cloud/layouter/place.rb', line 12

def initialize(layouter, shape)
  @layouter, @shape = layouter, shape

  # initial position
  @start_x = (
    @layouter.width/2 +                # from center
    (rand-0.5) *                       # random shift
    (@layouter.width - @shape.width)   # not more than (cloud width - word width)
  ).to_i
  @start_y = (
    @layouter.height/2 +               # from center
    (rand-0.5) *                       # random shift
    (@layouter.height - @shape.height) # not more than (cloud height - word height)
  ).to_i

  # when shift of position is more than max delta (diagonal of cloud)
  # there is no hope it will eventually found its place
  @max_delta = Math.sqrt(@layouter.width**2 + @layouter.height**2)

  # algo of next position calc
  @spiral = make_spiral(@shape.size)

  # direction of spiral
  @dt = rand < 0.5 ? 1 : -1 

  # initial point of time before we start to look for place
  @t = -@dt
end

Instance Method Details

#next! ⇒ Object 



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# File 'lib/magic_cloud/layouter/place.rb', line 41

def next!
  @t += @dt
  dx, dy = @spiral.call(@t)

  fail PlaceNotFound if [dx, dy].map(&:abs).min > @max_delta

  @shape.x = @start_x + dx
  @shape.y = @start_y + dy
end

#ready? ⇒ Boolean 



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# File 'lib/magic_cloud/layouter/place.rb', line 51

def ready?
  !out_of_board? && !@layouter.board.collides?(@shape)
end