Class: XRVG::AttributeMotifIterator

Inherits:
BezierBuilder show all
Defined in:
lib/bezierbuilders.rb

Overview

Attribute Motif Iterator

Content

More advanced motif iterator than SimilarMotifIterator, and also more expensive, AttributeMotifIterator samples a curvesampler and foreach pair build a new bezier motif, with varying attributes

Attributes

attribute :curvesampler, nil, Splittable
attribute :motifclass
attribute :nmotifs, 10
attribute :attributes, [], Array
attribute :closed, false

:motifclass is a BezierBuilder class, as ArcBezier, PicBezier, or even AttributeMotifIterator…

:attributes is of the form [attribute1, specification1, :attribute2, specification, …] with

  • attribute1, attribute2 attributes of the :motifclass

  • specification can be :

    • single value

    • sampler

:closed attribute state if each subbezier computed for each point pair must be closed with the corresponding subbezier of the :curvesampler

Example

motif        = PicBezier[ :support, [V2D::O, V2D::X], :height, -1.0 ]
curvesampler = bezier.geo( 3.0 )
result = AttributeMotifIterator[ :curvesampler, curvesampler, :motifclass, ArcBezier, :attributes, [:height, (-2.0..0.0).random], :nmotifs, 30, :closed, true ]

WARNING

Only works with BezierMotif defined by two points

Instance Method Summary collapse

Methods inherited from BezierBuilder

[], build, lissage

Instance Method Details

#compute ⇒ Object

BezierBuilder overloading

See AttributeMotifIterator class description for details



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# File 'lib/bezierbuilders.rb', line 140

def compute
  result = []
  attrvalues = []
  self.attributes.foreach do |name, spec|
    attrvalues += [name, Samplable.build( spec ).samples( self.nmotifs )]
  end
  self.curvesampler.splits( self.nmotifs ).each_with_index do |subbezier,index|
    pair = [subbezier.firstpoint, subbezier.lastpoint]
    p1, p2 = pair
    args = [:support, pair]
    attrvalues.foreach do |name, values|
	args += [name, values[index]]
    end
    newbezier = self.motifclass[ *args ]
    if self.closed
	newbezier = newbezier + subbezier.reverse
    end
    result += newbezier.data
  end
  return result
end