Бойко обнови решението на 28.11.2015 20:45 (преди около 9 години)
+module TurtleGraphics
+ class Turtle
+ def initialize(height, width)
+ @width, @height = width, height
+ @board = Array.new(height) { Array.new(width, 0) }
+ @position = nil
+ @orientation = nil
+ end
+
+ def draw(canvas = nil, &block)
+ self.instance_eval &block
+
+ if canvas.nil?
+ @board
+ else
+ canvas.print(@board)
+ end
+ end
+
+ private
+
+ def ensure_spawn
+ spawn_at(0, 0) if @position.nil?
+ @orientation = Complex(0, 1) if @orientation.nil?
+ end
+
+ def move
+ ensure_spawn
+ delta_y, delta_x = @orientation.real, @orientation.imag
+ @position = [@position[0] + delta_y, @position[1] + delta_x]
+ @board[@position[0]][@position[1]] += 1
+ end
+
+ def spawn_at(row, column)
+ @position = [row, column]
+ y, x = @position
+ @board[y][x] = 1
+ end
+
+ def turn_right
+ ensure_spawn
+ @orientation *= Complex(0, -1)
+ end
+
+ def turn_left
+ ensure_spawn
+ @orientation *= Complex(0, 1)
+ end
+
+ def look(orientation)
+ @orientation = case orientation
+ when :left
+ Complex(0, 1)
+ when :up
+ Complex(-1, 0)
+ when :right
+ Complex(0, -1)
+ when :down
+ Complex(1, 0)
+ end
+ end
+ end
+
+ module Canvas
+ def self.normalize(board)
+ max = board.flatten.max
+ max = 1 if max == 0
+ board.map { |row| row.map { |x| x / max.to_f } }
+ end
+
+ class ASCII
+ def initialize(characters)
+ @characters = characters
+ range_size = 1 / (characters.length - 1).to_f
+ @ranges = Array.new(characters.length) { |i|
+ (((i - 1) * range_size).next_float.. i * range_size)
+ }
+
+ @ranges[0] = (0.. 0) if characters.length > 0
+ end
+
+ def print(board)
+ normalized_board = TurtleGraphics::Canvas::normalize board
+ output = ""
+
+ normalized_board.each { |row|
+ output << row.map { |x| correspondig_character x }.join << "\n"
+ }
+
+ output
+ end
+
+ private
+
+ def correspondig_character(intensity)
+ @characters[@ranges.find_index { |r| r.cover? intensity }]
+ end
+ end
+
+ class HTML
+ def initialize(size)
+ @size = size
+ end
+
+ def print(board)
+ normalized_board = TurtleGraphics::Canvas::normalize board
+ rows = normalized_board.map { |row| html_row row }.join("\n")
+ %Q(<!DOCTYPE html>
+<html>
+<head>
+ <title>Turtle graphics</title>
+
+ <style>
+ table {
+ border-spacing: 0;
+ }
+
+ tr {
+ padding: 0;
+ }
+
+ td {
+ width: #{@size}px;
+ height: #{@size}px;
+
+ background-color: black;
+ padding: 0;
+ }
+ </style>
+</head>
+<body>
+ <table>
+ #{rows}
+ </table>
+</body>
+</html>)
+ end
+
+ private
+
+ def html_row(row)
+ pixels = row.map { |intensity| html_pixel intensity }.join("\n")
+ "<tr>\n#{pixels}\n</tr>"
+ end
+
+ def html_pixel(intensity)
+ "<td style=\"opacity: #{format('%.2f', intensity)}\"></td>\n"
+ end
+ end
+ end
+end