Class: XRVG::InterBezier

Inherits:
Object
  • Object
show all
Includes:
Attributable, GeoVariety, Interpolation, Samplable
Defined in:
lib/geovariety.rb,
lib/interbezier.rb

Overview

InterBezier GeoVariety implementation

Principle

InterBezier defines a surface by the set of every possible curve sample from one interpolated curve to the other. Geodesic corresponds then to one interpolated result, and point to a point of this curve

Direct Known Subclasses

GradientBezier

Instance Method Summary collapse

Methods included from Samplable

#apply_samples, build, #mean, #sample, #samples

Methods included from FloatFunctor

#addfilter, #alternate, #apply, #applyhash, #compute, #filter, #generate, #geo, #geofull, #modify, #process, #random, #shuffle, #sin, #ssort, #transform, #transforms, #trigger

Methods included from Interpolation

#compute_simplebezier, #getcurve, #interpoltype, #linear, #samplelist, #simplebezier

Methods included from GeoVariety

#bezier

Constructor Details

#initialize(*args) ⇒ InterBezier

Returns a new instance of InterBezier.



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# File 'lib/interbezier.rb', line 10

def initialize( *args )
  super( *args )
  self.init_interpolation_structures
end

Instance Method Details

#init_interpolation_structures ⇒ Object 



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# File 'lib/interbezier.rb', line 15

def init_interpolation_structures
  beziers = []
  indexes = []
  @bezierlist.foreach do |index, bezier| 
    beziers.push( bezier )
    indexes.push( index )
  end

  lengthH = {}
  alllengths = []
  beziers.each do |bezier|
    lengths = bezier.piecelengths
    Trace("bezier lengths #{lengths.inspect}")
    lengthH[ bezier ] = lengths
    alllengths += lengths
  end
  alllengths = Float.sort_float_list( alllengths )
  Trace("alllengths #{alllengths.inspect}")
  
  newbezierlist = []
  beziers.each do |bezier|
    newpieces = []
    initlengths = lengthH[ bezier ]
    alllengths.pairs do |l1, l2| 
	newpieces += bezier.subbezier( l1, l2 ).pieces
    end
    newbezier = Bezier[ :pieces, newpieces ]
    newbezierlist << newbezier
  end

  Trace("newbezierlist #{newbezierlist.length}")
  beziers = newbezierlist
  bezierpointlists = beziers.map {|bezier| bezier.pointlist(:vector) }
  Trace("bezierpointlists #{bezierpointlists.map {|list| list.length}.inspect}")
  pointsequencelist = bezierpointlists.forzip
  @interpolatorlist = []
  pointsequencelist.foreach(beziers.size) do |pointsequence|
    interlist = [indexes, pointsequence].forzip
    @interpolatorlist.push( Interpolator.new( :samplelist, interlist ) )
  end
end

#interpolate(abs, container = nil) ⇒ Object Also known as: apply_sample 



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# File 'lib/interbezier.rb', line 57

def interpolate( abs, container=nil )
  pieces = []
  @interpolatorlist.foreach(4) do |interpiece|
    piece = interpiece.map {|inter| inter.interpolate( abs )}
    pieces.push( [:vector] + piece )
  end
  return Bezier.multi( pieces )    
end

#line(x1, x2, y) ⇒ Object

Compute the geodesic subcurve with y coord between x1 and x2



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# File 'lib/geovariety.rb', line 54

def line( x1, x2, y )
  # Trace("interbezier line x1 #{x1} x2 #{x2} y #{y}")
  curve = self.sample( y )
  result = curve.apply_split( x1, x2 )
  # Trace("interbezier line result #{result.inspect}")
  return result
end

#point(point) ⇒ Object

Compute the geodesic curve by doing self.sample with y coord, and then compute point of this curve with length “x”



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# File 'lib/geovariety.rb', line 48

def point( point )
  curve = self.sample( point.y )
  return curve.point( point.x )
end