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Introductiongchartrb is a Ruby wrapper around the Google chart API located at http://code.google.com/apis/chart/ It provides a nice object oriented interface with friendly names, and methods to populate data. Then the data is automatically encoded and the URL can be generated. Features in the new release of Google Charts API are pending and should be implemented soon. Check out TodoList for a complete list. Download and InstallationThe simplest way to install gchartrb is via Rubygems gem install gchartrb Alternatively you can download the latest packages from the Download Page. Run/View the lib/test.rb file to get started. DocumentationA comprehensive README along with the API docs are located http://gchartrb.rubyforge.org You can also look at the lib/test.rb (link) and lib/example.rb (link) in the package for a comprehensive set of examples. Another source is the gchartrb entries on Deepak's blog ChangesMay 21 2008
May 13 2008
May 7 2008
Mar 20 2008
Feb 3 2008
Jan 27 2008
Jan 23 2008
Jan 07 2008
Dec 19 2007
Dec 12 2007 (evening)
Dec 12 2007
Sample UsageHere is some sample code require 'rubygems'
require 'google_chart'
# Pie Chart
GoogleChart::PieChart.new('320x200', "Pie Chart",false) do |pc|
pc.data "Apples", 40
pc.data "Banana", 20
pc.data "Peach", 30
pc.data "Orange", 60
puts "\nPie Chart"
puts pc.to_url
# Pie Chart with no labels
pc.show_labels = false
puts "\nPie Chart (with no labels)"
puts pc.to_url
end
# Line Chart
GoogleChart::LineChart.new('320x200', "Line Chart", false) do |lc|
lc.data "Trend 1", [5,4,3,1,3,5,6], '0000ff'
lc.show_legend = true
lc.data "Trend 2", [1,2,3,4,5,6], '00ff00'
lc.data "Trend 3", [6,5,4,3,2,1], 'ff0000'
lc.axis :y, :range => [0,6], :color => 'ff00ff', :font_size => 16, :alignment => :center
lc.axis :x, :range => [0,6], :color => '00ffff', :font_size => 16, :alignment => :center
lc.grid :x_step => 100.0/6.0, :y_step => 100.0/6.0, :length_segment => 1, :length_blank => 0
puts "\nLine Chart"
puts lc.to_url
end
# Bar Chart
GoogleChart::BarChart.new('800x200', "Bar Chart", :vertical, false) do |bc|
bc.data "Trend 1", [5,4,3,1,3,5], '0000ff'
bc.data "Trend 2", [1,2,3,4,5,6], 'ff0000'
bc.data "Trend 3", [6,5,4,4,5,6], '00ff00'
puts "\nBar Chart"
puts bc.to_url
end
# Line XY Chart
line_chart_xy = GoogleChart::LineChart.new('320x200', "Line XY Chart", true) do |lcxy|
lcxy.data "Trend 1", [[1,1], [2,2], [3,3], [4,4]], '0000ff'
lcxy.data "Trend 2", [[4,5], [2,2], [1,1], [3,4]], '00ff00'
puts "\nLine XY Chart (inside a block)"
puts lcxy.to_url
end
# Venn Diagram
# Supply three vd.data statements of label, size, color for circles A, B, C
# Then, an :intersections with four values:
# the first value specifies the area of A intersecting B
# the second value specifies the area of B intersecting C
# the third value specifies the area of C intersecting A
# the fourth value specifies the area of A intersecting B intersecting C
GoogleChart::VennDiagram.new("320x200", 'Venn Diagram') do |vd|
vd.data "Blue", 100, '0000ff'
vd.data "Green", 80, '00ff00'
vd.data "Red", 60, 'ff0000'
vd.intersections 30,30,30,10
puts "\nVenn Diagram"
puts vd.to_url
end
# Scatter Chart
GoogleChart::ScatterChart.new('320x200',"Scatter Chart") do |sc|
sc.data "Scatter Set", [[1,1,], [2,2], [3,3], [4,4]]
sc.max_value [5,5] # Setting the max value
sc.axis :x, :range => [0,5]
sc.axis :y, :range => [0,5], :labels => [0,1,2,3,4,5]
sc.point_sizes [10,15,30,55] # Optional
puts "\nScatter Chart"
puts sc.to_url
end
GoogleChart::LineChart.new('320x200', "Line Chart", false) do |lc|
lc.data "Trend 1", [5,4,3,1,3,5,6], '0000ff'
lc.show_legend = true
lc.data "Trend 2", [1,2,3,4,5,6], '00ff00'
lc.data "Trend 3", [6,5,4,3,2,1], 'ff0000'
lc.axis :y, :range => [0,6], :color => 'ff00ff', :font_size => 16, :alignment => :center
lc.axis :x, :range => [0,6], :color => '00ffff', :font_size => 16, :alignment => :center
lc.grid :x_step => 100.0/6.0, :y_step => 100.0/6.0, :length_segment => 1, :length_blank => 0
puts "\nLine Chart"
end
# Solid fill
line_chart_xy.fill(:background, :solid, {:color => 'fff2cc'})
line_chart_xy.fill(:chart, :solid, {:color => 'ffcccc'})
puts "\nLine Chart with Solid Fill"
puts line_chart_xy.to_url
# Gradient fill
line_chart_xy.fill :background, :gradient, :angle => 0, :color => [['76A4FB',1],['ffffff',0]]
line_chart_xy.fill :chart, :gradient, :angle => 0, :color => [['76A4FB',1], ['ffffff',0]]
puts "\nLine Chart with Gradient Fill"
puts line_chart_xy.to_url
# Stripes Fill
line_chart_xy.fill :chart, :stripes, :angle => 90, :color => [['76A4FB',0.2], ['ffffff',0.2]]
puts "\nLine Chart with Stripes Fill"
puts line_chart_xy.to_url
puts "\nLine Chart with range markers and shape markers"
GoogleChart::LineChart.new('320x200', "Line Chart", false) do |lc|
lc.title_color = 'ff00ff'
lc.data "Trend 1", [5,4,3,1,3,5,6], '0000ff'
lc.data "Trend 2", [1,2,3,4,5,6], '00ff00'
lc.data "Trend 3", [6,5,4,3,2,1], 'ff0000'
lc.max_value 10 # Setting max value for simple line chart
lc.range_marker :horizontal, :color => 'E5ECF9', :start_point => 0.1, :end_point => 0.5
lc.range_marker :vertical, :color => 'a0bae9', :start_point => 0.1, :end_point => 0.5
# Draw an arrow shape marker against lowest value in dataset
lc.shape_marker :arrow, :color => '000000', :data_set_index => 0, :data_point_index => 3, :pixel_size => 10
puts lc.to_url
end
Which generates the following as output (copy paste the URLs in the browser to view output) Pie Chart http://chart.apis.google.com/chart?cht=p&chl=Apples|Banana|Peach|Orange&chs=320x200&chd=s:oUe9&chtt=Pie+Chart Pie Chart (with no labels) http://chart.apis.google.com/chart?cht=p&chs=320x200&chd=s:oUe9&chtt=Pie+Chart Line Chart http://chart.apis.google.com/chart?chxt=y,x&cht=lc&chs=320x200&chco=0000ff,00ff00,ff0000&chdl=Trend+1|Trend+2|Trend+3&chd=s:yoeKey9,KUeoy9,9yoeUK&chxr=0,0,6|1,0,6&chtt=Line+Chart&chg=16.6666666666667,16.6666666666667,1.0,0.0&chxs=0,ff00ff,16,0|1,00ffff,16,0 Bar Chart http://chart.apis.google.com/chart?cht=bvg&chs=800x200&chco=0000ff,ff0000,00ff00&chdl=Trend+1|Trend+2|Trend+3&chd=s:yoeKey,KUeoy9,9yooy9&chtt=Bar+Chart Line XY Chart (inside a block) http://chart.apis.google.com/chart?cht=lxy&chs=320x200&chco=0000ff,00ff00&chdl=Trend+1|Trend+2&chd=s:Pet9,MYkw,9ePt,9YMw&chtt=Line+XY+Chart Venn Diagram http://chart.apis.google.com/chart?cht=v&chs=320x200&chco=0000ff,00ff00,ff0000&chdl=Blue|Green|Red&chd=s:9wkSSSG&chtt=Venn+Diagram Scatter Chart http://chart.apis.google.com/chart?chxt=x,y&cht=s&chxl=1:|0|1|2|3|4|5&chs=320x200&chd=s:MYkw,MYkw,LQh9&chxr=0,0,5|1,0,5&chtt=Scatter+Chart Line Chart Line Chart with Solid Fill http://chart.apis.google.com/chart?chf=bg,s,fff2cc|c,s,ffcccc&cht=lxy&chs=320x200&chco=0000ff,00ff00&chdl=Trend+1|Trend+2&chd=s:Pet9,MYkw,9ePt,9YMw&chtt=Line+XY+Chart Line Chart with Gradient Fill http://chart.apis.google.com/chart?chf=bg,lg,0,76A4FB,1,ffffff,0|c,lg,0,76A4FB,1,ffffff,0&cht=lxy&chs=320x200&chco=0000ff,00ff00&chdl=Trend+1|Trend+2&chd=s:Pet9,MYkw,9ePt,9YMw&chtt=Line+XY+Chart Line Chart with Stripes Fill http://chart.apis.google.com/chart?chf=bg,lg,0,76A4FB,1,ffffff,0|c,ls,90,76A4FB,0.2,ffffff,0.2&cht=lxy&chs=320x200&chco=0000ff,00ff00&chdl=Trend+1|Trend+2&chd=s:Pet9,MYkw,9ePt,9YMw&chtt=Line+XY+Chart Line Chart with range markers and shape markers http://chart.apis.google.com/chart?cht=lc&chs=320x200&chco=0000ff,00ff00,ff0000&chdl=Trend+1|Trend+2|Trend+3&chd=s:eYSGSek,GMSYek,keYSMG&chtt=Line+Chart&chts=ff00ff&chm=a,000000,0,3,10 |
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