Class: FlameChannelParser::Segments::BezierSegment

Inherits:

LinearSegment

• Object
• ConstantSegment
• LinearSegment
• FlameChannelParser::Segments::BezierSegment

show all

Defined in:

lib/segments.rb

Overview

Defined Under Namespace

Classes: Pt

Constant Summary

APPROXIMATION_EPSILON =

1.0e-09

VERYSMALL =

1.0e-20

MAXIMUM_ITERATIONS =

100

Constants inherited from ConstantSegment

ConstantSegment::NEG_INF, ConstantSegment::POS_INF

Instance Attribute Summary

Attributes inherited from ConstantSegment

#end_frame, #start_frame

Instance Method Summary (collapse)

• - (BezierSegment) initialize(x1, x2, y1, y2, t1x, t1y, t2x, t2y) constructor

  A new instance of BezierSegment.

• - (Object) value_at(frame)

Methods inherited from ConstantSegment

#defines?

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# File 'lib/segments.rb', line 98

def initialize(x1, x2, y1, y2, t1x, t1y, t2x, t2y)
  @start_frame, @end_frame = x1, x2
  
  @a = Pt.new(x1, y1, t1x, t1y)
  @b = Pt.new(x2, y2, t2x, t2y)
end

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# File 'lib/segments.rb', line 105

def value_at(frame)
  return @a.y if frame == @start_frame
  
  # Solve T from X. This determines the correlation between X and T.
  t = approximate_t(frame, @a.x, @a.tanx, @b.tanx, @b.x)
  vy = bezier(t, @a.y, @a.tany, @b.tany, @b.y)
end