Module: GoogleVisualr::Packages::ImageChart

Included in:
Image::BarChart, Image::LineChart, Image::PieChart, Image::SparkLine
Defined in:
lib/google_visualr/packages.rb

Constant Summary collapse

IMAGE_DEFAULTS =

Set defaults according to code.google.com/apis/chart/interactive/docs/gallery/genericimagechart.html#Configuration_Options

{
  # Automatic Scaling
  :chds => "a",
  # Size
  :chs => "400x200",
  # Axes
  :chxt => "x,y"
}

Instance Method Summary collapse

Instance Method Details

#chart_image_url(superseding_params = {}) ⇒ Object

Generates HTTP GET URL for the chart image

Parameters:

*opts         [Optional] Hash of standard chart options (see http://code.google.com/apis/chart/image/docs/chart_params.html)



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# File 'lib/google_visualr/packages.rb', line 31

def chart_image_url(superseding_params = {})

  #####
  # Generic image chart defaults
  query_params = IMAGE_DEFAULTS.clone

  # backgroundColor
  query_params[:chf] = "bg,s," + options["backgroundColor"].gsub(/#/, '') if options["backgroundColor"]

  # color, colors ('color' param is ignored if 'colors' is present)
  if options["colors"]
    query_params[:chco] = options["colors"].join(',').gsub(/#/, '')
  elsif options["color"]
    query_params[:chco] = options["color"].gsub(/#/, '')
  end

  # fill (this will often not look good - better for user to override this parameter)
  query_params[:chm] = "B,#{query_params[:chco].split(',').first},0,0,0" if options["fill"] && query_params[:chco]

  # firstHiddenColumn, singleColumnDisplay, data
  firstHiddenColumn = options["firstHiddenColumn"] ? options["firstHiddenColumn"] : data_table.cols.size - 1
  query_params[:chd] = "t:"
  unless options["singleColumnDisplay"]
    for i in 1..firstHiddenColumn do
      query_params[:chd] += "|" if i > 1
      query_params[:chd] += data_table.get_column(i).join(',')
    end
  else
    query_params[:chd] += data_dable.get_column(options["singleColumnDisplay"])
  end

  # height, width
  if options["height"] && options["width"]
    query_params[:chs] = "#{options["width"]}x#{options["height"]}"
  end

  # title
  query_params[:chtt] = options["title"] if options["title"]

  # legend
  unless options["legend"] == 'none'
    query_params[:chdlp] = options["legend"].first unless options["legend"].blank?
    query_params[:chdl] = data_table.cols[1..-1].map{|col| col[:label] }.join('|')
  else
    query_params.delete(:chdlp)
    query_params.delete(:chdl)
  end

  # min, max, valueLabelsInterval (works as long as :chxt => "x,y" and both 'min' and 'max' are set)
  if options["min"] && options["max"]
    query_params[:chxr] = "1,#{options['min']},#{options['max']}"
    query_params[:chxr] += ",#{options['valueLabelsInterval']}" if options['valueLabelsInterval']
    query_params[:chds] = "#{options['min']},#{options['max']}"
  end
  #####

  query_params = stringify_keys!(query_params.merge(superseding_params))
  base_url = "https://chart.googleapis.com/chart"
  query = ""
  query_params.each_with_index do |(k,v),i|
    query += (i == 0) ? "?" : "&"
    query += "#{k}=#{CGI.escape(v)}"
  end
  URI.parse(base_url + query)
end

#class_name ⇒ Object 



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# File 'lib/google_visualr/packages.rb', line 13

def class_name
  "Image#{self.class.to_s.split('::').last}"
end

#package_name ⇒ Object 



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# File 'lib/google_visualr/packages.rb', line 10

def package_name
  "image#{self.class.to_s.split("::").last.downcase}"
end