Class: Ranicoma::Design::PolyPoly

Inherits:
Base
  • Object
show all
Defined in:
lib/ranicoma/design/polypoly.rb

Instance Attribute Summary collapse

Attributes inherited from Base

#rng

Instance Method Summary collapse

Methods inherited from Base

add_subclass, #fill, inherited, #points_str, #rainbow, #rand, #rand_rotate, #rect_element, #rectpos, #stroke, subclasses

Methods included from Util

#element

Constructor Details

#initialize(rng) ⇒ PolyPoly

Returns a new instance of PolyPoly.



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# File 'lib/ranicoma/design/polypoly.rb', line 12

def initialize(rng)
  super
  @psize = rng.rand(6..20)
  @line_width = 1.0/(@psize*5)
end

Instance Attribute Details

#line_width ⇒ Object (readonly)

Returns the value of attribute line_width.



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# File 'lib/ranicoma/design/polypoly.rb', line 19

def line_width
  @line_width
end

#psize ⇒ Object (readonly)

Returns the value of attribute psize.



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# File 'lib/ranicoma/design/polypoly.rb', line 18

def psize
  @psize
end

Instance Method Details

#colors(n) ⇒ Object 



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# File 'lib/ranicoma/design/polypoly.rb', line 21

def colors(n)
  f = lambda{ |t0|
    v = lambda{ |t|
      case t
      when 0..1 then t
      when 1..2 then 2-t
      else 0
      end
    }[t0 % 3]
    (v**0.5*255).round
  }
  Array.new(n){ |i|
    t = i*3.0/n+2
    [f[t],f[t+1],f[t+2]]
  }
end

#create ⇒ Object 



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# File 'lib/ranicoma/design/polypoly.rb', line 81

def create
  [
    poly([0.5,0.5],0.5-line_width)
  ].flatten
end

#poly(center, r) ⇒ Object 



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# File 'lib/ranicoma/design/polypoly.rb', line 38

def poly(center, r)
  delta = Math::PI*2/psize*0.7
  dirs = Array.new(psize){ |ix| Math::PI*2*ix / psize + rng.rand(delta) }
  outer = dirs.map{ |e|
    [Math.cos(e)*r+center[0], Math.sin(e)*r+center[1]]
  }
  edelta = rng.rand(-0.2..0.2) * Math::PI*2
  ri = r * rng.rand(0.2..0.5)
  cd = rng.rand(Math::PI)
  rdelta = rng.rand((r-ri-line_width)*0.8)
  inner_cx = center[0] + Math.cos(cd)*rdelta
  inner_cy = center[1] + Math.sin(cd)*rdelta
  inner = dirs.map{ |e|
    t = e + edelta
    [Math.cos(t)*ri+inner_cx, Math.sin(t)*ri+inner_cy]
  }
  use = Array.new(inner.size){ rng.rand<0.8 }
  cols = rand_rotate(colors(use.count(true)))
  center_poly = element( "polygon",
    points:points_str(inner),
    **fill(i(black white gray).sample( random:rng)),
    **stroke(:black, line_width),
    "stroke-linejoin": :round )
  Array.new( outer.size ){ |ix|
    if ! use[ix]
      []
    else
      pts = [
        outer[ix % psize],
        outer[(ix+1) % psize],
        inner[(ix+1) % psize],
        inner[ix % psize]
      ]
      element(
        "polygon",
        points:points_str(pts),
        **fill(cols.pop),
        **stroke(:black, line_width),
        "stroke-linejoin": :round )
    end
  } + [center_poly]
end