Class: HotCocoa::Graphics::Rope

Inherits:
Object
  • Object
show all
Defined in:
lib/hotcocoa/graphics/elements/rope.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(canvas, options = {}) ⇒ Rope

Returns a new instance of Rope.



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# File 'lib/hotcocoa/graphics/elements/rope.rb', line 20

def initialize(canvas, options={})
  @canvas       = canvas
  @width        = options[:width] || 200
  @fibers       = options[:fibers] || 200
  @roundness    = options[:roundness] || 1.0
  @strokewidth  = options[:strokewidth] || 0.4
end

Instance Attribute Details

#fibers ⇒ Object

Returns the value of attribute fibers.



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# File 'lib/hotcocoa/graphics/elements/rope.rb', line 18

def fibers
  @fibers
end

#roundness ⇒ Object

Returns the value of attribute roundness.



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# File 'lib/hotcocoa/graphics/elements/rope.rb', line 18

def roundness
  @roundness
end

#strokewidth ⇒ Object

Returns the value of attribute strokewidth.



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# File 'lib/hotcocoa/graphics/elements/rope.rb', line 18

def strokewidth
  @strokewidth
end

#width ⇒ Object

Returns the value of attribute width.



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# File 'lib/hotcocoa/graphics/elements/rope.rb', line 18

def width
  @width
end

#x0 ⇒ Object

Returns the value of attribute x0.



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# File 'lib/hotcocoa/graphics/elements/rope.rb', line 18

def x0
  @x0
end

#x1 ⇒ Object

Returns the value of attribute x1.



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# File 'lib/hotcocoa/graphics/elements/rope.rb', line 18

def x1
  @x1
end

#y0 ⇒ Object

Returns the value of attribute y0.



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# File 'lib/hotcocoa/graphics/elements/rope.rb', line 18

def y0
  @y0
end

#y1 ⇒ Object

Returns the value of attribute y1.



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# File 'lib/hotcocoa/graphics/elements/rope.rb', line 18

def y1
  @y1
end

Instance Method Details

#hair(hair_x0 = @x0, hair_y0 = @y0, hair_x1 = @x1, hair_y1 = @y1, hair_width = @width, hair_fibers = @fibers) ⇒ Object 



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# File 'lib/hotcocoa/graphics/elements/rope.rb', line 28

def hair(hair_x0=@x0, hair_y0=@y0, hair_x1=@x1, hair_y1=@y1, hair_width=@width, hair_fibers=@fibers)
  @canvas.push
  @canvas.strokewidth(@strokewidth)
  @canvas.autoclosepath(false)
  @canvas.nofill
  hair_x0 = choose(hair_x0)
  hair_y0 = choose(hair_y0)
  hair_x1 = choose(hair_x1)
  hair_y1 = choose(hair_y1)
  vx0 = random(-@canvas.width   / 2,  @canvas.width   / 2) * @roundness
  vy0 = random(-@canvas.height  / 2,  @canvas.height  / 2) * @roundness
  vx1 = random(-@canvas.width   / 2,  @canvas.width   / 2) * @roundness
  vy1 = random(-@canvas.height  / 2,  @canvas.height  / 2) * @roundness
  hair_fibers.times do |j|
    #x0,y0,x1,y1 = [@x0.choose,@y0.choose,@x1.choose,@y1.choose]
    @canvas.beginpath(hair_x0, hair_y0)
    @canvas.curveto(
        hair_x0 + vx0 + rand(hair_width), hair_y0 + vy0 + rand(hair_width), # control point 1
        hair_x1 + vx1, hair_y1 + vy1,                                       # control point 2
        hair_x1, hair_y1                                                    # end point
    )
    @canvas.endpath
  end
  @canvas.pop
end

#ribbon(ribbon_x0 = @x0, ribbon_y0 = @y0, ribbon_x1 = @x1, ribbon_y1 = @y1, ribbon_width = @width, ribbon_fibers = @fibers) ⇒ Object 



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# File 'lib/hotcocoa/graphics/elements/rope.rb', line 54

def ribbon(ribbon_x0=@x0, ribbon_y0=@y0, ribbon_x1=@x1, ribbon_y1=@y1, ribbon_width=@width, ribbon_fibers=@fibers)
  @canvas.push
  @canvas.strokewidth(@strokewidth)
  @canvas.autoclosepath(false)
  @canvas.nofill
  black = Color.black
  white = Color.white
  ribbon_x0 = choose(ribbon_x0)
  ribbon_y0 = choose(ribbon_y0)
  ribbon_x1 = choose(ribbon_x1)
  ribbon_y1 = choose(ribbon_y1)
  vx0 = random(-@canvas.width   / 2, @canvas.width  / 2) * @roundness
  vy0 = random(-@canvas.height  / 2, @canvas.height / 2) * @roundness
  vx1 = random(-@canvas.width   / 2, @canvas.width  / 2) * @roundness
  vy1 = random(-@canvas.height  / 2, @canvas.height / 2) * @roundness
  xwidth = rand(ribbon_width)
  ywidth = rand(ribbon_width)
  ribbon_fibers.times do |j|
    #x0,y0,x1,y1 = [@x0.choose,@y0.choose,@x1.choose,@y1.choose]
    xoffset = (j-1).to_f * xwidth / ribbon_fibers
    yoffset = (j-1).to_f * ywidth / ribbon_fibers
    cpx0 = ribbon_x0 + vx0 + xoffset
    cpy0 = ribbon_y0 + vy0 + yoffset
    cpx1 = ribbon_x1 + vx1
    cpy1 = ribbon_y1 + vy1
    # debug - show control points
    # @canvas.fill(black)
    # @canvas.oval(cpx0,cpy0,5,5,:center)
    # @canvas.fill(white)
    # @canvas.oval(cpx1,cpy1,5,5,:center)
    # @canvas.nofill

    @canvas.beginpath(x0, y0)
    @canvas.curveto(
      cpx0, cpy0,           # control point 1
      cpx1, cpy1,           # control point 2
      ribbon_x1, ribbon_y1  # end point
    )
    @canvas.endpath
  end
  @canvas.pop
end