Class: Pixelflow::Turtle

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(canvas) ⇒ Turtle

Returns a new instance of Turtle.



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# File 'lib/pixelflow_canvas.rb', line 852

def initialize(canvas)
    @canvas = canvas
    @x = canvas.width / 2.0
    @y = canvas.height / 2.0
    @phi = 270.0
    @pen_down = true
end

Instance Attribute Details

#color ⇒ Object

Returns the value of attribute color.



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# File 'lib/pixelflow_canvas.rb', line 860

def color
  @color
end

#pen_down ⇒ Object

Returns the value of attribute pen_down.



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# File 'lib/pixelflow_canvas.rb', line 860

def pen_down
  @pen_down
end

#phi ⇒ Object

Returns the value of attribute phi.



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# File 'lib/pixelflow_canvas.rb', line 860

def phi
  @phi
end

#x ⇒ Object

Returns the value of attribute x.



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# File 'lib/pixelflow_canvas.rb', line 860

def x
  @x
end

#y ⇒ Object

Returns the value of attribute y.



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# File 'lib/pixelflow_canvas.rb', line 860

def y
  @y
end

Instance Method Details

#forward(l) ⇒ Object 



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# File 'lib/pixelflow_canvas.rb', line 862

def forward(l)
    nx = @x + Math.cos(@phi * Math::PI / 180.0) * l
    ny = @y + Math.sin(@phi * Math::PI / 180.0) * l
    @canvas.draw_line(@x, @y, nx, ny) if @pen_down
    @x = nx
    @y = ny
end

#set_color(r = 0, g = nil, b = nil) ⇒ Object 



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# File 'lib/pixelflow_canvas.rb', line 870

def set_color(r = 0, g = nil, b = nil)
    @canvas.set_color(r, g, b)
end

#turn_left(phi) ⇒ Object 



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# File 'lib/pixelflow_canvas.rb', line 874

def turn_left(phi)
    @phi -= phi
end

#turn_right(phi) ⇒ Object 



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# File 'lib/pixelflow_canvas.rb', line 878

def turn_right(phi)
    @phi += phi
end