Class: Flightdeck::Metrics::Sparkline

Inherits:
Object
  • Object
show all
Defined in:
app/models/flightdeck/metrics/sparkline.rb

Overview

Tiny area+line for the queue cards and the Overview mini-table.

Constant Summary collapse

WIDTH = 
100
HEIGHT = 
30

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(values) ⇒ Sparkline

Returns a new instance of Sparkline.



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# File 'app/models/flightdeck/metrics/sparkline.rb', line 12

def initialize(values)
  @values = Array(values).map(&:to_i)
end

Instance Attribute Details

#values ⇒ Object (readonly)

Returns the value of attribute values.



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# File 'app/models/flightdeck/metrics/sparkline.rb', line 10

def values
  @values
end

Instance Method Details

#any? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'app/models/flightdeck/metrics/sparkline.rb', line 18

def any? = values.any? && values.max.positive?

#area_path ⇒ Object 



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# File 'app/models/flightdeck/metrics/sparkline.rb', line 36

def area_path
  return "" if coordinates.empty?

  "#{line_path} L #{coordinates.last[:x]} #{HEIGHT} L #{coordinates.first[:x]} #{HEIGHT} Z"
end

#coordinates ⇒ Object 



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# File 'app/models/flightdeck/metrics/sparkline.rb', line 20

def coordinates
  @coordinates ||= begin
    max = [ values.max.to_i, 1 ].max
    step = values.size > 1 ? WIDTH.to_f / (values.size - 1) : WIDTH.to_f

    values.each_with_index.map do |value, index|
      { x: (index * step).round(2),
        y: (HEIGHT - 2 - ((value.to_f / max) * (HEIGHT - 4))).round(2) }
    end
  end
end

#height ⇒ Object 



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# File 'app/models/flightdeck/metrics/sparkline.rb', line 17

def height = HEIGHT

#last_point ⇒ Object 



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# File 'app/models/flightdeck/metrics/sparkline.rb', line 42

def last_point = coordinates.last

#line_path ⇒ Object 



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# File 'app/models/flightdeck/metrics/sparkline.rb', line 32

def line_path
  coordinates.each_with_index.map { |c, i| "#{i.zero? ? "M" : "L"} #{c[:x]} #{c[:y]}" }.join(" ")
end

#width ⇒ Object 



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# File 'app/models/flightdeck/metrics/sparkline.rb', line 16

def width = WIDTH