Class: Curvature::Curve

Inherits:
Object
  • Object
show all
Defined in:
lib/curvature/curve.rb

Constant Summary collapse

DefaultSampleAttributes = 
{
  stroke: 'none',
  fill: 'black',
}

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(params = {}) ⇒ Curve

Returns a new instance of Curve.



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# File 'lib/curvature/curve.rb', line 9

def initialize(params={})
  @samples = []
  {
  }.merge(params).each { |k, v| send("#{k}=", v) }
end

Instance Attribute Details

#chart ⇒ Object

Returns the value of attribute chart.



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# File 'lib/curvature/curve.rb', line 7

def chart
  @chart
end

#name ⇒ Object

Returns the value of attribute name.



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# File 'lib/curvature/curve.rb', line 5

def name
  @name
end

#samples ⇒ Object

Returns the value of attribute samples.



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# File 'lib/curvature/curve.rb', line 6

def samples
  @samples
end

Instance Method Details

#<<(sample) ⇒ Object 



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# File 'lib/curvature/curve.rb', line 15

def <<(sample)
  @samples << sample
end

#print ⇒ Object 



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# File 'lib/curvature/curve.rb', line 29

def print
  puts @name
  @samples.each do |sample|
    puts "\t%2s: %2.2f => %2.2f" % [sample.label, sample.input, sample.output]
  end
  puts
end

#to_html ⇒ Object 



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# File 'lib/curvature/curve.rb', line 42

def to_html
  xml = Builder::XmlMarkup.new(indent: 2)

  # draw interpolated curve
  xml.g(fill: 'none', stroke: 'green', :'stroke-width' => 0.5) do
    points = @chart.x_range.step(1.0 / @chart.width).map do |input|
      @chart.scaled_point(input, value_for(input))
    end
    xml.polyline(points: points.map { |pt| pt.join(',') }.join(' '))
  end

  # draw individual samples
  @samples.each do |sample|
    cx, cy = @chart.scaled_point(sample.input, sample.output)
    attributes = DefaultSampleAttributes.merge(
      title: sample.label,
      cx: cx,
      cy: cy,
      r: 3,
    ).merge(sample.attributes || {})
    xml.circle(attributes)
  end

  xml.target!
end

#value_for(input) ⇒ Object 



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# File 'lib/curvature/curve.rb', line 19

def value_for(input)
  unless @spliner
    @spliner = Spliner::Spliner.new(
      @samples.map(&:input),
      @samples.map(&:output),
    )
  end
  @spliner[input] or raise "Can't find output for input #{input.inspect} on curve #{@name.inspect}"
end