Веселин обнови решението на 01.12.2015 21:07 (преди почти 10 години)
+module TurtleGraphics
+
+ module Canvas
+
+ class Standard
+ ORIENTATIONS = %i(right down left up)
+ attr_accessor :width, :height, :x, :y
+
+ def initialize(width, height)
+ @width, @height = width, height
+ @canvas = Array.new
+ if (width != 0 && height != 0)
+ populate_canvas
+ end
+ @row, @column = 0, 0
+ @orientation = 0
+ @max = 0
+ end
+
+ def populate_canvas
+ (0..(@height - 1)).each do
+ row = Array.new
+ (1..@width).each do
+ row.push(0)
+ end
+ @canvas.push(row)
+ end
+ @canvas[0][0] = 1
+ end
+
+ def draw(&block)
+ self.instance_eval(&block)
+ to_a
+ end
+
+ def turn_right()
+ @orientation += 1
+ @orientation = 0 if @orientation > 3
+ end
+
+ def turn_left()
+ @orientation -= 1
+ @orientation = 3 if @orientation < 0
+ end
+
+ def fix_position
+ @column = 0 if @column == @width
+ @column = @width - 1 if @column < 0
+ @row = 0 if @row == @height
+ @row = @height - 1 if @row < 0
+ @canvas[@row][@column] += 1
+ @max = @canvas.flatten.max if @canvas[@row][@column] > @max
+ end
+
+ def move()
+ case ORIENTATIONS[@orientation]
+ when :right
+ @column += 1
+ when :down
+ @row += 1
+ when :left
+ @column -= 1
+ when :up
+ @row -= 1
+ end
+ fix_position
+ end
+
+ def spawn_at(row, column)
+ @canvas[0][0] = 0
+ @canvas[row][column] = 1
+ @row, @column = row, column
+ @orientation = 0
+ end
+
+ def look(orientation)
+ @orientation = ORIENTATIONS.index(orientation)
+ end
+
+ def to_a
+ @canvas
+ end
+ end
+
+ class ASCII < Standard
+ def initialize(chars)
+ @chars = chars
+ super(0,0)
+ end
+
+ def draw(&block)
+ self.instance_eval(&block)
+ to_s
+ end
+
+ def get_symbol(intensity)
+ step = 1.0 / (@chars.size - 1)
+ index, initial_intensity = 0, 0
+ while intensity > initial_intensity
+ index += 1
+ initial_intensity += step
+ end
+ @chars[index]
+ end
+
+ def add_column(element)
+ get_symbol(element.to_f / @max)
+ end
+
+ def add_row(row)
+ result = ""
+ row.each do |element|
+ result += add_column(element)
+ end
+ result + "\n"
+ end
+
+ def to_s
+ result = ""
+ @canvas.each do |row|
+ result += add_row(row)
+ end
+ result
+ end
+
+ end
+
+ class HTML < Standard
+
+ HTML_STRING = "
+<!DOCTYPE html>
+<html>
+ <head>
+ <title>Turtle graphics</title>
+ <style>
+ table {
+ border-spacing: 0;
+ }
+
+ tr {
+ padding: 0;
+ }
+
+ td {
+ width: ##|width|##px;
+ height: ##|height|##px;
+
+ background-color: black;
+ padding: 0;
+ }
+ </style>
+ </head>
+ <body>
+ <table>
+ ##|table|##
+ </table>
+ </body>
+</html>"
+
+ def initialize(pixels)
+ @pixels = pixels
+ super(0,0)
+ end
+
+ def draw(&block)
+ self.instance_eval(&block)
+ to_s
+ end
+
+ def generate_td(element)
+ '<td style="opacity: ' + (element.to_f / @max).to_s + '" ></td>'
+ end
+
+ def generate_tr(row)
+ result = '<tr>'
+ row.each do |element|
+ result += generate_td(element)
+ end
+ result += '</tr>'
+ result
+ end
+
+ def to_s
+ table = ""
+ @canvas.each do |row|
+ table += generate_tr(row)
+ end
+ result = HTML_STRING.gsub("##|table|##", table)
+ result = result.gsub!("##|width|##", @pixels.to_s)
+ result = result.gsub!("##|height|##", @pixels.to_s)
+ result
+ end
+ end
+
+ end
+
+ class Turtle
+
+ def initialize(width, height)
+ @width, @height = width, height
+ @canvas = Canvas::Standard.new(width, height)
+ end
+
+ def draw(canvas = nil, &block)
+ if canvas != nil
+ canvas.width = @width
+ canvas.height = @height
+ canvas.populate_canvas
+ canvas.draw(&block)
+ else
+ @canvas.draw(&block)
+ end
+ end
+
+ end
+
+end