Class: Tortoise::Interpreter

Inherits:
Object
  • Object
show all
Defined in:
lib/tortoise/interpreter.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(instructions) ⇒ Interpreter

Returns a new instance of Interpreter.



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# File 'lib/tortoise/interpreter.rb', line 5

def initialize(instructions)
  lines = instructions.to_s.split("\n")

  @size = lines.shift.to_i
  @canvas = new_canvas
  @direction = 0
  @pen_down = false
  center = (@size - @size/2) - 1

  update_position(center, center)
  draw(lines)
end

Instance Attribute Details

#canvas ⇒ Object (readonly)

Returns the value of attribute canvas.



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# File 'lib/tortoise/interpreter.rb', line 3

def canvas
  @canvas
end

#direction ⇒ Object (readonly)

Returns the value of attribute direction.



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# File 'lib/tortoise/interpreter.rb', line 3

def direction
  @direction
end

#position ⇒ Object (readonly)

Returns the value of attribute position.



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# File 'lib/tortoise/interpreter.rb', line 3

def position
  @position
end

#size ⇒ Object (readonly)

Returns the value of attribute size.



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# File 'lib/tortoise/interpreter.rb', line 3

def size
  @size
end

Instance Method Details

#bk(steps) ⇒ Object 



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# File 'lib/tortoise/interpreter.rb', line 48

def bk(steps)
  walk(-steps)
end

#draw(commands) ⇒ Object 



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# File 'lib/tortoise/interpreter.rb', line 52

def draw(commands)
  commands = commands.split("\n") if commands.respond_to?(:split)
  commands.each { |command| execute(command) }
end

#fd(steps) ⇒ Object 



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# File 'lib/tortoise/interpreter.rb', line 44

def fd(steps)
  walk(steps)
end

#lt(degrees) ⇒ Object 



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# File 'lib/tortoise/interpreter.rb', line 40

def lt(degrees)
  rotate(-degrees)
end

#pd ⇒ Object 



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# File 'lib/tortoise/interpreter.rb', line 27

def pd
  @pen_down = true
  update_canvas
end

#pen_down? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/tortoise/interpreter.rb', line 32

def pen_down?
  @pen_down
end

#pu ⇒ Object 



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# File 'lib/tortoise/interpreter.rb', line 23

def pu
  @pen_down = false
end

#rt(degrees) ⇒ Object 



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# File 'lib/tortoise/interpreter.rb', line 36

def rt(degrees)
  rotate(degrees)
end

#setpos(x, y) ⇒ Object 



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# File 'lib/tortoise/interpreter.rb', line 18

def setpos(x, y)
  @position = place_in_canvas_bounds(x, y)
  update_canvas
end