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extract @options[:item_width] and @options[:item_width] into a seperate methods for convenience.

Instead of providing the item colors as a key in the data hash, we should pass in the data as a simple Array and pass in the colors as an option.

We should fail if the number of colors does not match the number of data items unless no colors are provided.

If no colors are provided, we should provide a set of default colors, maybe move BarGraph#colors to Graph.

For example:

CircleCountGraph.new([32,21,12], colors: [:red, :blue, :green])

The SymbolCountGraph gets Symbols passed from Options

SymbolCountGraph.new([12,4,15], colors: ['*', '@', '$']

css-class definition in style causes ArgumentError in BitmapGraph

  def body(x, y, color)
    center_x = center_(x)
    top    = y + item_height / 2
    bottom = y + item_height
    style  = {
      stroke:         color,
      stroke_width:   item_width / 4,
      stroke_linecap: 'round',
      class:          'body'     <-----------------------------------------
    }

    renderer.line center_x, top, center_x, bottom, style
  end

Allow the configuration of a background color. Default is white.

we want to be able to ask for this:
labels.blank?
and not for this
if options[:labels]...

We need to be able to set a outer margin, so that the items do not go to the edge of the image. The default should be 20px.

in lib/graph.rb

We need to be able to set a inner margin between the items, so that they do not touch each other. The default should be 2px.

We need to be able to provide an option which allows us to specify a label for each data item. The names should be rendered in a legend box below the dots

We should fail if the number of labels is smaller then the number of data items unless no labels are provided.

For example:

CircleCountGraph.new([32,21,12], labels: ['Cars', 'Buses', 'Bikes'])

TODO vs. DONE

• implement lables in SvgRenderer
• implement labels in MagickRenderer