Class: Curvature::Chart

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(params = {}) ⇒ Chart

Returns a new instance of Chart.



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# File 'lib/curvature/chart.rb', line 12

def initialize(params={})
  @curves = []
  {
    width: 500,
    height: 500,
  }.merge(params).each { |k, v| send("#{k}=", v) }
end

Instance Attribute Details

#curves ⇒ Object

Returns the value of attribute curves.



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# File 'lib/curvature/chart.rb', line 10

def curves
  @curves
end

#height ⇒ Object

Returns the value of attribute height.



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

def height
  @height
end

#name ⇒ Object

Returns the value of attribute name.



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

def name
  @name
end

#width ⇒ Object

Returns the value of attribute width.



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

def width
  @width
end

#x_range ⇒ Object

Returns the value of attribute x_range.



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# File 'lib/curvature/chart.rb', line 8

def x_range
  @x_range
end

#y_range ⇒ Object

Returns the value of attribute y_range.



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

def y_range
  @y_range
end

Instance Method Details

#<<(curve) ⇒ Object 



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# File 'lib/curvature/chart.rb', line 20

def <<(curve)
  curve.chart = self
  @curves << curve
end

#scaled_point(x, y) ⇒ Object 



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# File 'lib/curvature/chart.rb', line 25

def scaled_point(x, y)
  [
    @width * ((x - @x_range.min) / (@x_range.max - @x_range.min)),
    @height * ((y - @y_range.min) / (@y_range.max - @y_range.min)),
  ]
end

#to_html ⇒ Object 



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# File 'lib/curvature/chart.rb', line 32

def to_html
  xml = Builder::XmlMarkup.new(indent: 2)
  xml.div(class: 'chart') do
    xml.h2(@name) if @name
    xml.svg(xmlns: 'http://www.w3.org/2000/svg', version: '1.1', width: @width, height: @height) do
      xml.g(width: @width, height: @height, transform: "translate(0,#{@height}) scale(1,-1)") do
        # draw border
        xml.rect(x: 0, y: 0, width: @width, height: @height, fill: 'none', :'stroke-width' => 1, stroke: 'blue')

        # draw linear line
        xml.line(x1: 0, y1: 0, x2: @width, y2: @height, :'stroke-width' => 0.5, stroke: 'blue')

        # draw curves
        @curves.each do |curve|
          xml << curve.to_html
        end
      end
    end
  end
  xml.target!
end