Class: AnalyticsCharts::CustomPie

Inherits:
Object
  • Object
show all
Includes:
Magick
Defined in:
lib/analytics_charts/custom_pie.rb

Direct Known Subclasses

PieAndLabels

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(image_path, label_hash, pie_label_hash) ⇒ CustomPie

Returns a new instance of CustomPie.



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# File 'lib/analytics_charts/custom_pie.rb', line 13

def initialize(image_path, label_hash, pie_label_hash)
  @base_image = Image.read(image_path)[0]
  @columns = @base_image.columns
  @rows = @base_image.rows
  @d = Draw.new
  @data = Hash.new # Value is array with two items
  @aggregate = Array([0,0,0,0]) # Cluster brands into categories
  @label_hash = Hash.new
  @pie_label_hash = Hash.new
  @label_hash = label_hash if label_hash
  @pie_label_hash = pie_label_hash if pie_label_hash
  set_pie_colors(%w(#AD1F25 #BE6428 #C1B630 #1E753B #FFFFFF))
end

Instance Attribute Details

#label_hash ⇒ Object

Returns the value of attribute label_hash.



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# File 'lib/analytics_charts/custom_pie.rb', line 8

def label_hash
  @label_hash
end

#label_offset ⇒ Object

Returns the value of attribute label_offset.



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# File 'lib/analytics_charts/custom_pie.rb', line 12

def label_offset
  @label_offset
end

#label_start_x ⇒ Object

Returns the value of attribute label_start_x.



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# File 'lib/analytics_charts/custom_pie.rb', line 10

def label_start_x
  @label_start_x
end

#label_start_y ⇒ Object

Returns the value of attribute label_start_y.



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# File 'lib/analytics_charts/custom_pie.rb', line 11

def label_start_y
  @label_start_y
end

#pie_center_x ⇒ Object

Returns the value of attribute pie_center_x.



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# File 'lib/analytics_charts/custom_pie.rb', line 5

def pie_center_x
  @pie_center_x
end

#pie_center_y ⇒ Object

Returns the value of attribute pie_center_y.



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# File 'lib/analytics_charts/custom_pie.rb', line 6

def pie_center_y
  @pie_center_y
end

#pie_label_hash ⇒ Object

Returns the value of attribute pie_label_hash.



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# File 'lib/analytics_charts/custom_pie.rb', line 9

def pie_label_hash
  @pie_label_hash
end

#pie_radius ⇒ Object

Returns the value of attribute pie_radius.



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# File 'lib/analytics_charts/custom_pie.rb', line 7

def pie_radius
  @pie_radius
end

Instance Method Details

#draw ⇒ Object 



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# File 'lib/analytics_charts/custom_pie.rb', line 70

def draw
  total_sum = @aggregate.inject(:+) + 0.0 # Sum elements and make it a float
  if total_sum == 0
    @d.stroke_width(@pie_radius)
    @d = @d.stroke "#FFFFFF"
    @d = @d.ellipse(@pie_center_x, @pie_center_y,
                @pie_radius / 2.0, @pie_radius / 2.0,
                0, 360 + 0.5) # <= +0.5 'fudge factor' gets rid of the ugly gaps
    @d = @d.stroke "#000000"
    @d.stroke_width(5)
    @d = @d.line(@pie_center_x-30,@pie_center_y-30,@pie_center_x-14,@pie_center_y-14)
    @d = @d.line(@pie_center_x-30,@pie_center_y-14,@pie_center_x-14,@pie_center_y-30)
    @d = @d.line(@pie_center_x+14,@pie_center_y-30,@pie_center_x+30,@pie_center_y-14)
    @d = @d.line(@pie_center_x+14,@pie_center_y-14,@pie_center_x+30,@pie_center_y-30)
    @d.stroke_width(10)
    @d = @d.ellipse(@pie_center_x, @pie_center_y + 20,
                5,5,
                0, 360) # <= +0.5 'fudge factor' gets rid of the ugly gaps
    draw_pie_label(@pie_center_x,@pie_center_y, 45,
        @pie_radius, "$0", 4)
    return
  end
  if @data.size > 0
    @d.stroke_width(@pie_radius)
    prev_degrees = 60.0
    @d.fill_opacity(0) # VERY IMPORTANT, otherwise undesired artifact can result.
    degrees = Array([0,0,0,0])
    label_offset_degrees =  Array([0,0,0,0])
    @aggregate.each_with_index do |data_row, index|
      degrees[index] = (data_row / total_sum) * 360.0
    end
    num_small_slices = 0
    small_slice_index = Array([0,0,0,0])
    for i in 0..3
      if degrees[i] != 0 and degrees[i] < 18.0
        num_small_slices += 1
        small_slice_index[i] = 1
      end
    end
    for i in 0..3 # First draw slices
      next if degrees[i] == 0
      @d = @d.stroke @colors[i]
      # ellipse will draw the the stroke centered on the first two parameters offset by the second two.
      # therefore, in order to draw a circle of the proper diameter we must center the stroke at
      # half the radius for both x and y
      @d = @d.ellipse(@pie_center_x, @pie_center_y,
                @pie_radius / 2.0, @pie_radius / 2.0,
                prev_degrees, prev_degrees + degrees[i] + 0.5) # <= +0.5 'fudge factor' gets rid of the ugly gaps
      prev_degrees += degrees[i]
    end
    # If less than two small slices, or there are two small slices that are not adjacent
    if num_small_slices < 2 or (num_small_slices == 2 and small_slice_index[0] == small_slice_index[2])
      #Do nothing
    # If two adjacent small slices, push them apart. Non-adjacent case is taken care of above.
    # I also push back the other labels too. The logic is condensed. To see original logic,
    # consult appendix.html
    elsif num_small_slices == 2
      if small_slice_index[1] == 1
        label_offset_degrees[0] = -15
        label_offset_degrees[2] = 15
      else
        label_offset_degrees[0] = 15
        label_offset_degrees[2] = -15
      end
      if small_slice_index[2] == 1
        label_offset_degrees[1] = -15
        label_offset_degrees[3] = 15
      else
        label_offset_degrees[1] = 15
        label_offset_degrees[3] = -15
      end
    # In this case, push apart only the outside small slices.
    elsif num_small_slices == 3
      if small_slice_index[0] == 0
        label_offset_degrees[1] = -15
        label_offset_degrees[3] = 15
      elsif small_slice_index[1] == 0
        label_offset_degrees[2] = -15
        label_offset_degrees[0] = 15
      elsif small_slice_index[2] == 0
        label_offset_degrees[3] = -15
        label_offset_degrees[1] = 15
      elsif small_slice_index[3] == 0
        label_offset_degrees[0] = -15
        label_offset_degrees[2] = 15
      end
    end
    prev_degrees = 60.0 # Now focus on labels
    @aggregate.each_with_index do |data_row, i|
      next if degrees[i] == 0
      half_angle = prev_degrees + degrees[i] / 2
      label_string = '$' + data_row.round(2).to_s
      draw_pie_label(@pie_center_x,@pie_center_y, half_angle + label_offset_degrees[i],
        @pie_radius, label_string, i)
      prev_degrees += degrees[i]
    end
  end
end

#draw_labels ⇒ Object 



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# File 'lib/analytics_charts/custom_pie.rb', line 175

def draw_labels
  @d.align = LeftAlign
  sorted_data = @data.sort_by{|key,value| -value[1]} # Sort by descending quality
  x_offset = @label_start_x
  y_offset = @label_start_y
  for data in sorted_data
    has_data = false
    if data[1][0] > 0 # Amount > 0
      font_weight = 900 # Very Bold
      text = data[0]
      has_data = true
    else
      text = data[0]
      font_weight = 900 # Very Bold
    end
    if has_data
      case data[1][1]
      when 3
        # label_hash gets merged and overrided by fill and font_weight.
        insert_text_with_arrow(x_offset, y_offset, text,
          @label_hash.merge({'fill'=> '#1E753B', 'font_weight'=> font_weight }))
      when 2
        insert_text_with_arrow(x_offset, y_offset, text,
          @label_hash.merge({'fill'=> '#C1B630', 'font_weight'=> font_weight }))
      when 1
        insert_text_with_arrow(x_offset, y_offset, text,
         @label_hash.merge({'fill'=> '#BE6428', 'font_weight'=> font_weight }))
      when 0
        insert_text_with_arrow(x_offset, y_offset, text,
          @label_hash.merge({'fill'=> '#AD1F25', 'font_weight'=> font_weight }))
      end
    else
      case data[1][1]
      when 3
        # label_hash gets merged and overrided by fill and font_weight.
        insert_text(x_offset, y_offset, text,
          @label_hash.merge({'fill'=> '#1E753B', 'font_weight'=> font_weight }))
      when 2
        insert_text(x_offset, y_offset, text,
          @label_hash.merge({'fill'=> '#C1B630', 'font_weight'=> font_weight }))
      when 1
        insert_text(x_offset, y_offset, text,
         @label_hash.merge({'fill'=> '#BE6428', 'font_weight'=> font_weight }))
      when 0
        insert_text(x_offset, y_offset, text,
          @label_hash.merge({'fill'=> '#AD1F25', 'font_weight'=> font_weight }))
      end
    end
    y_offset += @label_offset
  end
end

#draw_pie_label(center_x, center_y, angle, radius, percent, index) ⇒ Object 



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# File 'lib/analytics_charts/custom_pie.rb', line 227

def draw_pie_label(center_x, center_y, angle, radius, percent, index)
  #気を付けて、get_type_metrics depends on font and pointsize, image res, AND font_weight so need to set those first
  # See more at http://studio.imagemagick.org/RMagick/doc/draw.html#get_type_metrics
  @d.font = @pie_label_hash['font'] if @pie_label_hash['font']
  @d.pointsize = @pie_label_hash['pointsize'] if @pie_label_hash['pointsize']
  ascent =  @d.get_type_metrics(@base_image, percent.to_s).ascent
  descent =  @d.get_type_metrics(@base_image, percent.to_s).descent
  width = @d.get_type_metrics(@base_image, percent.to_s).width
  radians = angle * Math::PI / 180.0
  x = center_x +  radius * Math.cos(radians)
  # By default, text is centered at bottom, so need to shift vertically to center it
  y =  center_y + ascent / 2.0 + radius * Math.sin(radians)
  # Imagine the text box around the text
  # Shift text box so a corner is tangent to circle
  if x > center_x
    x += width / 2.0
  end
  if x < center_x
    x -= width / 2.0
  end
  if y > center_y
    y += ascent / 2.0
  end
  if y < center_y
    y -= (ascent / 2.0 - descent) # descent to account for '$' descent,
    # descent value retrieved is negative, so sub instead of add
  end
  @d.align = CenterAlign

  # Provide default fill of black
  insert_text(x, y, percent, {'fill'=> @colors[index]}.merge(@pie_label_hash))# {'fill'=> 'black', 'font_weight'=> 700, 'pointsize'=>48})
end

#insert_pie_data(name, amount, quality) ⇒ Object 



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# File 'lib/analytics_charts/custom_pie.rb', line 43

def insert_pie_data(name, amount, quality)
  #convert all '&#39; instances to an apostrophe
  name = name.gsub(/&#39;/, "\'")
  @data[name] =  [amount, quality]
  @aggregate[quality] += amount
end

#insert_text(x_offset, y_offset, text, features = {}) ⇒ Object 



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# File 'lib/analytics_charts/custom_pie.rb', line 63

def insert_text(x_offset, y_offset, text, features = {})
  features.each { |feature, attribute|
    set_feature(feature, attribute)
  }
  @d.annotate(@base_image, 0 ,0, x_offset, y_offset, text)
end

#insert_text_with_arrow(x_offset, y_offset, text, features = {}) ⇒ Object 



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# File 'lib/analytics_charts/custom_pie.rb', line 49

def insert_text_with_arrow(x_offset, y_offset, text, features = {})
  features.each { |feature, attribute|
    set_feature(feature, attribute)
  }
  @d.annotate(@base_image, 0 ,0, x_offset, y_offset, text)
  height = @d.get_type_metrics(@base_image, text).ascent
  y_offset -= height / 2
  arrow_xpos = x_offset + @d.get_type_metrics(@base_image, text).width + 5
  @d.stroke_width(4)
  @d.stroke features["fill"]
  @d = @d.line(arrow_xpos+1,y_offset,arrow_xpos+12,y_offset+6)
  @d = @d.line(arrow_xpos,y_offset,arrow_xpos+30,y_offset)
  @d = @d.line(arrow_xpos+1,y_offset,arrow_xpos+12,y_offset-6)
end

#set_feature(feature, attribute) ⇒ Object 



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# File 'lib/analytics_charts/custom_pie.rb', line 260

def set_feature(feature, attribute)
  begin
    case feature
      when 'fill'
        @d.fill = attribute
      when 'font'
        @d.font = attribute
      when 'font_family'
        @d.font_family = attribute
      when 'font_stretch'
        @d.font_stretch = attribute
      when 'font_style'
        @d.font_style = attribute
      when 'font_weight'
        @d.font_weight = attribute
      when 'stroke'
        @d.stroke = attribute
      when 'pointsize'
        @d.pointsize = attribute
      when 'text_undercolor'
        @d.undercolor = attribute
    end
  rescue
    puts "Tried to set #{feature} to #{attribute}"
    puts $!, $@
  end
end

#set_label_values(label_start_x, label_start_y, label_offset) ⇒ Object 



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# File 'lib/analytics_charts/custom_pie.rb', line 27

def set_label_values(label_start_x, label_start_y, label_offset)
  @label_start_x = label_start_x
  @label_start_y = label_start_y
  @label_offset = label_offset
end

#set_pie_colors(list) ⇒ Object 



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# File 'lib/analytics_charts/custom_pie.rb', line 39

def set_pie_colors(list)
  @colors = list
end

#set_pie_geometry(x, y, radius) ⇒ Object 



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# File 'lib/analytics_charts/custom_pie.rb', line 33

def set_pie_geometry(x, y, radius)
  @pie_center_x = x
  @pie_center_y = y
  @pie_radius = radius
end

#write(filename = 'graph.png') ⇒ Object 



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# File 'lib/analytics_charts/custom_pie.rb', line 169

def write(filename='graph.png')
  draw
  draw_labels
  @base_image.write(filename)
end