Class: Amaze::Mask

Inherits:
Object
  • Object
show all
Defined in:
lib/amaze/mask.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(rows, columns) ⇒ Mask

Returns a new instance of Mask.



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# File 'lib/amaze/mask.rb', line 9

def initialize rows, columns
  @rows, @columns = rows, columns
  @bits = Array.new(@rows) { Array.new(@columns, true) }
end

Instance Attribute Details

#columns ⇒ Object (readonly)

The rows and columns of the mask



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# File 'lib/amaze/mask.rb', line 7

def columns
  @columns
end

#rows ⇒ Object (readonly)

The rows and columns of the mask



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# File 'lib/amaze/mask.rb', line 7

def rows
  @rows
end

Class Method Details

.from_png(file) ⇒ Object 



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# File 'lib/amaze/mask.rb', line 62

def self.from_png file
  image = ChunkyPNG::Image.from_file file
  mask = new image.height, image.width

  mask.rows.times do |row|
    mask.columns.times do |column|
      mask[row,column] = image[column, row] != ChunkyPNG::Color::BLACK
    end
  end
  
  mask
end

.from_txt(file) ⇒ Object 



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# File 'lib/amaze/mask.rb', line 45

def self.from_txt file
  lines = File.readlines(file).map(&:strip)
  lines.pop while lines.last.length < 1
  
  rows = lines.length
  columns = lines.first.length
  mask = new rows, columns
  
  mask.rows.times do |row|
    mask.columns.times do |column|
      mask[row,column] = lines[row][column] != 'X'
    end
  end
  
  mask
end

Instance Method Details

#[](row, column) ⇒ Object 



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# File 'lib/amaze/mask.rb', line 14

def [](row, column)
  if row.between?(0, rows - 1) && column.between?(0, columns - 1)
    @bits[row][column]
  else
    false
  end
end

#[]=(row, column, is_on) ⇒ Object 



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# File 'lib/amaze/mask.rb', line 22

def []=(row, column, is_on)
  @bits[row][column] = is_on
end

#count ⇒ Object 



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# File 'lib/amaze/mask.rb', line 26

def count
  count = 0
  
  rows.times do |row|
    columns.times do |column|
      count += 1 if @bits[row][column]
    end
  end
  count
end

#random_location ⇒ Object 



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# File 'lib/amaze/mask.rb', line 37

def random_location
  loop do
    row = rand(rows)
    column = rand(columns)
    return [row, column] if @bits[row][column]
  end
end