Class: Ranicoma::Design::RotObj

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

Constant Summary collapse

LINE = 
1.0/80

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) ⇒ RotObj

Returns a new instance of RotObj.



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

def initialize(rng)
  super
  @ct0 = rng.rand(Math::PI*2)
  @count = rng.rand(5..10)
  @body_seed = rng.rand(2**256)
end

Instance Attribute Details

#body_seed ⇒ Object (readonly)

Returns the value of attribute body_seed.



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# File 'lib/ranicoma/design/rotobj.rb', line 20

def body_seed
  @body_seed
end

#count ⇒ Object (readonly)

Returns the value of attribute count.



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

def count
  @count
end

Instance Method Details

#body(theta, seed) ⇒ Object 



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# File 'lib/ranicoma/design/rotobj.rb', line 40

def body(theta, seed)
  body_rng = Random.new(seed)
  arc=20
  r=0.48
  dt = Math::PI*2/count/2*0.9
  t0 = -Math::PI/2 - dt
  t1 = -Math::PI/2 + dt
  pts = [
    [0.5, 0.5]
  ]+Array.new(arc+1){ |ix|
    t = (t1-t0)*ix*1.0/arc + t0
    [Math.cos(t)*r+0.5, Math.sin(t)*r+0.5]
  }
  bc = rainbow( theta*3/(Math::PI*2) + @ct0 )
  dists=make_dists(body_rng, 0, 0.5, 3).flatten
  clip_id = Random.new_seed
  [
    element( "clipPath", id:clip_id ){
      element( "polygon", points:points_str(pts))
    },
    element( "g", "clip-path":"url(##{clip_id})", style:"fill:#0000" ){
      dists.map{ |dist|
        t = body_rng.rand(t0..t1)
        cx = Math.cos(t)*dist + 0.5
        cy = Math.sin(t)*dist + 0.5
        cr = body_rng.rand(0.05..0.1)
        color = colmove(body_rng,bc)
        if body_rng.rand(2)==0
          element(
            "circle",
            cx:cx, cy:cy, r:cr,
            **fill(color)
          )
        else
          element(
            "circle",
            cx:cx, cy:cy, r:cr,
            **stroke( color, 1.0/20)
          )
        end
      }
    }
  ]
end

#colmove(r, c) ⇒ Object 



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# File 'lib/ranicoma/design/rotobj.rb', line 34

def colmove( r, c )
  delta = 80
  f = ->(x){ r.rand(x-delta..x+delta).clamp(0,255).round }
  c.map{ |e| f[e] }
end

#create ⇒ Object 



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# File 'lib/ranicoma/design/rotobj.rb', line 92

def create
  basecol = rainbow(rng.rand(Math::PI*2), ->(v){ (v+3)/4.0 } )
  [
    element("circle", cx:0.5, cy:0.5, r:0.4, **fill(basecol) )
  ]+Array.new(count){ |ix|
    unit(Math::PI*2*ix/count)
  }.flatten
end

#make_dists(body_rng, lo, hi, depth) ⇒ Object 



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# File 'lib/ranicoma/design/rotobj.rb', line 22

def make_dists(body_rng, lo, hi, depth)
  return [] if depth<=0
  x = (hi-lo)*0.2
  mid = body_rng.rand(lo+x..hi-x)
  [
    body_rng.rand(lo..mid),
    make_dists(body_rng, lo, mid, depth-1),
    make_dists(body_rng, mid, hi, depth-1),
    body_rng.rand(mid..hi),
  ]
end

#unit(theta) ⇒ Object 



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# File 'lib/ranicoma/design/rotobj.rb', line 85

def unit(theta)
  rot = "rotate(#{theta*180/Math::PI},0.5,0.5)"
  element("g", transform:rot ){
    body(theta, body_seed)
  }
end