Class: Scruffy::Layers::Pie

Inherits:
Base
  • Object
show all
Includes:
Helpers::LayerContainer
Defined in:
lib/scruffy/layers/pie.rb

Overview

Scruffy::Layers::Pie

Author

A.J. Ostman

Date

August 15, 2006

Provides a container for pie slice.

Constant Summary collapse

RADIANS =

Setup Constants

Math::PI/180

Instance Attribute Summary collapse

Attributes inherited from Base

#color, #complexity, #height, #max_value, #min_value, #opacity, #options, #points, #preferred_color, #relevant_data, #title, #width

Instance Method Summary collapse

Methods included from Helpers::LayerContainer

#<<, #bottom_value, #layers, #layers=, #top_value

Methods inherited from Base

#bottom_value, #draw, #relevant_data?, #sum_values, #top_value

Constructor Details

#initialize(options = {}, &block) ⇒ Pie

The initialize method passes itself to the block, and since Pie is a LayerContainer, layers (pie slice) can be added just as if they were being added to Graph.



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# File 'lib/scruffy/layers/pie.rb', line 57

def initialize(options = {}, &block)
  super(options)

  # Allow for population of data with a block during initialization.
  if block
    block.call(self)
  else
    # Otherwise, just iterate over the points, adding the slices
    if @points.class == Hash
      @points.keys.each {|k|
        self.add :pie_slice, k.to_s, [@points[k]]}
    end
    if @points.class == Array
      @points.each {|v|
        self.add :pie_slice, '', [v]}
    end
  end
end

Instance Attribute Details

#center_x ⇒ Object

Returns the value of attribute center_x.



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# File 'lib/scruffy/layers/pie.rb', line 51

def center_x
  @center_x
end

#center_y ⇒ Object

Returns the value of attribute center_y.



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# File 'lib/scruffy/layers/pie.rb', line 51

def center_y
  @center_y
end

#degree_offset ⇒ Object

Returns the value of attribute degree_offset.



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# File 'lib/scruffy/layers/pie.rb', line 49

def degree_offset
  @degree_offset
end

#diameter ⇒ Object

Returns the value of attribute diameter.



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# File 'lib/scruffy/layers/pie.rb', line 47

def diameter
  @diameter
end

#percent_used ⇒ Object

Returns the value of attribute percent_used.



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# File 'lib/scruffy/layers/pie.rb', line 48

def percent_used
  @percent_used
end

#scaler ⇒ Object

Returns the value of attribute scaler.



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# File 'lib/scruffy/layers/pie.rb', line 50

def scaler
  @scaler
end

Instance Method Details

#legend_data ⇒ Object

A stacked graph has many data sets. Return legend information for all of them.



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# File 'lib/scruffy/layers/pie.rb', line 107

def legend_data
  if relevant_data?
    retval = []
    layers.each do |layer|
      retval << layer.legend_data
    end
    retval
  else
    nil
  end
end

#points=(val) ⇒ Object 



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# File 'lib/scruffy/layers/pie.rb', line 119

def points=(val)
  throw ArgumentsError, "Pie layers cannot accept points, only pie slices."
end

#render(svg, options = {}) ⇒ Object

Overrides Base#render to fiddle with layers’ points to achieve a stacked effect.



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# File 'lib/scruffy/layers/pie.rb', line 79

def render(svg, options = {})
  # #current_points = points.dup

  @scaler = 1
  total = 0
  
  layers.each do |layer|
    total += layer.sum_values
  end 
  
  @scaler = 100.0 / total
  
  @percent_used = 30
  
  layers.each do |layer|
    layer_options = options.dup
    layer_options = layer_options.merge(@options)
    layer_options = layer_options.merge(layer.options)
    layer_options[:scaler] = @scaler
    layer_options[:percent_used] = @percent_used
    @percent_used += @scaler * layer.sum_values
    layer_options[:color] = layer.preferred_color || layer.color || options[:theme].next_color          
    
    layer.render(svg, layer_options)
  end
end