Class: Charts::CountChart

Inherits:
Chart
  • Object
show all
Defined in:
lib/charts/count_chart/count_chart.rb

Instance Attribute Summary

Attributes inherited from Chart

#data, #options, #prepared_data, #renderer

Instance Method Summary collapse

Methods inherited from Chart

#create_options_methods, #draw_background, #draw_title, #initialize, #initialize_instance_variables, #post_draw, #pre_draw, #render, #validate_array_and_count

Constructor Details

This class inherits a constructor from Charts::Chart

Instance Method Details

#default_options ⇒ Object 



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# File 'lib/charts/count_chart/count_chart.rb', line 2

def default_options
  super.merge(
    columns:      10,
    inner_margin: 2,
    item_width:   20,
    item_height:  20
  )
end

#draw ⇒ Object 



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# File 'lib/charts/count_chart/count_chart.rb', line 25

def draw
  prepared_data.each_with_index do |row, row_count|
    row.each_with_index do |color, column_count|
      x = offset_x(column_count) + inner_margin + outer_margin
      y = offset_y(row_count) + inner_margin + outer_margin
      draw_item(x, y, color)
    end
  end
  draw_labels
end

#draw_item(_x, _y, _color) ⇒ Object

Raises:

  • (NotImplementedError) 


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# File 'lib/charts/count_chart/count_chart.rb', line 68

def draw_item(_x, _y, _color)
  raise NotImplementedError
end

#draw_label_text(x, y, label) ⇒ Object 



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# File 'lib/charts/count_chart/count_chart.rb', line 46

def draw_label_text(x, y, label)
  x = x + item_width + inner_margin
  y = y + item_height / 2 + 2 * renderer.font_size / 5
  renderer.text(label, x, y, class: 'label_text')
end

#draw_labels ⇒ Object 



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# File 'lib/charts/count_chart/count_chart.rb', line 36

def draw_labels
  return if labels.empty?
  data.each_with_index do |data, index|
    x = inner_margin + outer_margin
    y = offset_y(prepared_data.count + (index + 1)) + inner_margin + outer_margin
    draw_item(x, y, colors[index])
    draw_label_text(x, y, labels[index]) # expand total image size according to labels
  end
end

#height ⇒ Object 



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# File 'lib/charts/count_chart/count_chart.rb', line 76

def height
  (prepared_data.count + label_count) * outer_item_height + (2 * outer_margin)
end

#label_count ⇒ Object 



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# File 'lib/charts/count_chart/count_chart.rb', line 80

def label_count
  labels.any? ? (labels.count + 1) : 0
end

#offset_x(column_count) ⇒ Object 



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# File 'lib/charts/count_chart/count_chart.rb', line 52

def offset_x(column_count)
  column_count * outer_item_width
end

#offset_y(row_count) ⇒ Object 



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# File 'lib/charts/count_chart/count_chart.rb', line 56

def offset_y(row_count)
  row_count * outer_item_height
end

#outer_item_height ⇒ Object 



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# File 'lib/charts/count_chart/count_chart.rb', line 64

def outer_item_height
  item_height + 2 * inner_margin
end

#outer_item_width ⇒ Object 



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# File 'lib/charts/count_chart/count_chart.rb', line 60

def outer_item_width
  item_width + 2 * inner_margin
end

#prepare_data ⇒ Object 



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# File 'lib/charts/count_chart/count_chart.rb', line 17

def prepare_data
  prepared_data = []
  data.each_with_index do |value, index|
    value.to_i.times { prepared_data << colors[index].to_s }
  end
  prepared_data.each_slice(columns).to_a
end

#validate_arguments(data, options) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/charts/count_chart/count_chart.rb', line 11

def validate_arguments(data, options)
  super(data, options)
  raise ArgumentError if options[:inner_margin] and !options[:inner_margin].is_a?(Numeric)
  raise ArgumentError unless data.all? { |x| Integer(x) }
end

#width ⇒ Object 



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# File 'lib/charts/count_chart/count_chart.rb', line 72

def width
  prepared_data.first.count * outer_item_width + (2 * outer_margin) # + label_count?
end