Class: MyChart::Proto

Inherits:
Object
  • Object
show all
Defined in:
lib/my_chart/proto.rb

Direct Known Subclasses

Bar, Doughnut, Line, Pie, PlainBar, PolarArea, Radar

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(grouped_data, opt = {}) ⇒ Proto

Returns a new instance of Proto.

Raises:

  • (Exception) 


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# File 'lib/my_chart/proto.rb', line 26

def initialize grouped_data, opt={}
  raise Exception, "#{type} has no z axis" if grouped_data.kind_of? MyChart::XYZ and no_z_axis?
  @id = opt[:id]
  @grouped_data = grouped_data
  @width = opt[:w]
  @height = opt[:h]
  @name = opt[:name]
end

Instance Attribute Details

#id ⇒ Object (readonly)

Returns the value of attribute id.



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# File 'lib/my_chart/proto.rb', line 8

def id
  @id
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/my_chart/proto.rb', line 8

def name
  @name
end

Class Method Details

.no_z_axis ⇒ Object 



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# File 'lib/my_chart/proto.rb', line 12

def no_z_axis
  define_method :no_z_axis? do
    true
  end
end

.same_color_on_x ⇒ Object 



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# File 'lib/my_chart/proto.rb', line 18

def same_color_on_x
	define_method :styled_datasets do
    diff_color_on_z
	end
end

Instance Method Details

#concrete_options ⇒ Object 



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# File 'lib/my_chart/proto.rb', line 84

def concrete_options
  {}
end

#concrete_style ⇒ Object 



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# File 'lib/my_chart/proto.rb', line 92

def concrete_style
  {}
end

#concrete_type ⇒ Object 



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# File 'lib/my_chart/proto.rb', line 77

def concrete_type
end

#datasets ⇒ Object 



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# File 'lib/my_chart/proto.rb', line 39

def datasets
  @grouped_data.datasets
end

#default_html ⇒ Object 



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# File 'lib/my_chart/proto.rb', line 61

def default_html
  "<div class='my_chart'>#{title}<canvas id='#{id}' width='#{width}' height='#{height}'></canvas><script>#{iife}</script></div>"
end

#diff_color_on_x ⇒ Object 



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# File 'lib/my_chart/proto.rb', line 115

def diff_color_on_x
  [datasets[0].
     merge({backgroundColor: Rainbow[labels.size].map(&:to_s)}).
     merge(concrete_style)
  ]
end

#diff_color_on_z ⇒ Object 



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# File 'lib/my_chart/proto.rb', line 104

def diff_color_on_z
  colors = Rainbow[datasets.size].map do |color|
    {borderColor: color.to_s,
     backgroundColor: color.alpha(0.2).to_s,
     borderWidth: 1}
  end
  datasets.zip(colors).map do |ds, col|
    ds.merge(col).merge concrete_style
  end
end

#has_z? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/my_chart/proto.rb', line 100

def has_z?
  datasets.size > 1
end

#height ⇒ Object 



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# File 'lib/my_chart/proto.rb', line 73

def height
  @height || 300
end

#iife ⇒ Object 



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# File 'lib/my_chart/proto.rb', line 54

def iife
  "(function(){
    var ctx = document.getElementById('#{id}');
    var myChart = new Chart(ctx, #{json});
  })();"
end

#json ⇒ Object 



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# File 'lib/my_chart/proto.rb', line 43

def json
  {
   type: type,
   data: {
     labels: labels,
     datasets: styled_datasets
     },
   options: options
  }.to_json
end

#labels ⇒ Object 



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# File 'lib/my_chart/proto.rb', line 35

def labels
  @grouped_data.labels
end

#no_z_axis? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/my_chart/proto.rb', line 122

def no_z_axis?
  false
end

#options ⇒ Object 



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# File 'lib/my_chart/proto.rb', line 88

def options
  {responsive: false}.merge concrete_options
end

#styled_datasets ⇒ Object 



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# File 'lib/my_chart/proto.rb', line 96

def styled_datasets
  has_z? ? diff_color_on_z : diff_color_on_x
end

#title ⇒ Object 



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# File 'lib/my_chart/proto.rb', line 65

def title
  name ? "<h1>#{name}</h1>" : ""
end

#type ⇒ Object 



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# File 'lib/my_chart/proto.rb', line 80

def type
  concrete_type || :proto
end

#width ⇒ Object 



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# File 'lib/my_chart/proto.rb', line 69

def width
  @width || 800
end