Class: Pacman::Sprites

Inherits:
Object
  • Object
show all
Defined in:
lib/pacman/sprites.rb

Overview

Procedurally drawn actor sprites. A board cell is scale character rows by scale * 2 columns; half-block characters double the vertical resolution, giving a square 2k x 2k pixel grid to draw circles and skirts on.

Constant Summary collapse

MOUTH_COSINE = 
0.75

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(scale) ⇒ Sprites

Returns a new instance of Sprites.



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# File 'lib/pacman/sprites.rb', line 44

def initialize(scale)
  @scale = scale
  @pixels = scale * 2
  @center = (@pixels - 1) / 2.0
  @radius = scale - 0.15
end

Class Method Details

.cherry(scale:) ⇒ Object 



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# File 'lib/pacman/sprites.rb', line 31

def self.cherry(scale:)
  return ["● "] if scale == 1

  new(scale).cherry
end

.eaten(scale:) ⇒ Object 



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# File 'lib/pacman/sprites.rb', line 37

def self.eaten(scale:)
  return ["▀▀"] if scale == 1

  sprite = new(scale)
  sprite.draw { |y, x| sprite.eye?(y, x) }
end

.frightened(scale:) ⇒ Object 



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# File 'lib/pacman/sprites.rb', line 24

def self.frightened(scale:)
  return ["▒▒"] if scale == 1

  sprite = new(scale)
  sprite.draw(texture: "▒") { |y, x| sprite.ghost_body?(y, x) && !sprite.eye?(y, x) }
end

.ghost(scale:) ⇒ Object 



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# File 'lib/pacman/sprites.rb', line 17

def self.ghost(scale:)
  return ["██"] if scale == 1

  sprite = new(scale)
  sprite.draw { |y, x| sprite.ghost_body?(y, x) && !sprite.eye?(y, x) }
end

.player(scale:, direction:) ⇒ Object 



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# File 'lib/pacman/sprites.rb', line 10

def self.player(scale:, direction:)
  return ["██"] if scale == 1

  sprite = new(scale)
  sprite.draw { |y, x| sprite.pacman?(y, x, direction) }
end

Instance Method Details

#cherry ⇒ Object 



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# File 'lib/pacman/sprites.rb', line 59

def cherry
  body = draw { |y, x| berry?(y, x) }
  add_stems(body)
end

#draw(texture: nil) ⇒ Object 



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# File 'lib/pacman/sprites.rb', line 51

def draw(texture: nil)
  (0...scale).map do |row|
    (0...pixels).map do |col|
      cell_char(yield(row * 2, col), yield(row * 2 + 1, col), texture)
    end.join
  end
end

#eye?(y, x) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/pacman/sprites.rb', line 75

def eye?(y, x)
  return false if scale < 2

  size = [scale / 2, 1].max
  row = (pixels * 0.35).floor
  return false unless (row...(row + size)).cover?(y)

  left = (pixels * 0.3).floor
  right = (pixels * 0.65).floor
  (left...(left + size)).cover?(x) || (right...(right + size)).cover?(x)
end

#ghost_body?(y, x) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/pacman/sprites.rb', line 68

def ghost_body?(y, x)
  return skirt?(x) && (x - center).abs <= radius if y == pixels - 1
  return circle?(y, x) if y < scale

  (x - center).abs <= radius
end

#pacman?(y, x, direction) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/pacman/sprites.rb', line 64

def pacman?(y, x, direction)
  circle?(y, x) && !mouth?(y, x, direction)
end