1.
Charting with GoogleThursday, March 24, 2011

2.
http://bit.ly/googlechartlinks Follow along with a list of all the links mentionedThursday, March 24, 2011

3.
Russell Heimlich (Like the Maneuver) ★ Sole Developer at the Pew Research Center ★ 3 Years at U.S.News & World Report ★ Creator of Dummyimage.com ★ Left handed!Thursday, March 24, 2011

4.
How Can Google Help Us Make Charts? ★ DataTable Object ★ Interactive Charts (Visualization API) ★ Image Charts (Chart API)Thursday, March 24, 2011

5.
Getting Started You have to start somewhere... http://www.flickr.com/photos/npobre/2601582256/Thursday, March 24, 2011

6.
Load Some Libraries <!--Load the AJAX API--> <script src="http://www.google.com/jsapi"></script> <script type="text/javascript"> // Load the Visualization API and the piechart package. google.load(visualization, 1, {packages:[corechart]}); // Set a callback to run when everything is loaded. google.setOnLoadCallback(drawChart); function drawChart() { // MAGIC! } </script>Thursday, March 24, 2011

7.
DataTable Object Like a database in JavaScriptThursday, March 24, 2011

8.
What is a DataTable? ★ Representation of your data in JavaScript ★ Query just like SQL ★ Sortable, Filterable, Cloneable, Manipulatable ★ Easy to pass along to different visualizationsThursday, March 24, 2011

9.
Making a DataTable var data = new google.visualization.DataTable(); data.addColumn(string, Task); data.addColumn(number, Hours); data.addRows([ [Work, 11], [Eat, 1], [Commute, 2], [Watch TV, 3] ]);Thursday, March 24, 2011

10.
More Ways To Populate Data // Create and populate the data table. var data = new google.visualization.DataTable(); data.addColumn(string, Task); data.addColumn(number, Hours per Day); data.addRows(4); data.setValue(0, 0, Work); //row index, cell index, value data.setValue(0, 1, 11); data.setValue(1, 0, Eat); data.setValue(1, 1, 1); data.setValue(2, 0, Commute); data.setValue(2, 1, 2); data.setValue(3, 0, Watch TV); data.setValue(3, 1, 3);Thursday, March 24, 2011

11.
Which Looks Like This Task Hours Work 11 Eat 1 Commute 2 Watch TV 3Thursday, March 24, 2011

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DataViews ★ Subset of data from a DataTable ★ Remove or duplicate rows or columns ★ Original DataTable stays intact ★ Live view of the underlying data, not a copyThursday, March 24, 2011

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Making A DataView var view = new google.visualization.DataView(data); view.setRows( view.getFilteredRows([{ column:1, maxValue:5 }]) );Thursday, March 24, 2011

14.
Our DataView Now Looks Like This Task Hours Eat 1 Commute 2 Watch TV 3Thursday, March 24, 2011

15.
Building Interactive Charts Getting Nitty GrittyThursday, March 24, 2011

16.
Let’s Make A Pie Chart // Create and draw the visualization. var target = document.getElementById(visualization); new google.visualization.PieChart(target).draw( view, {title: ‘So, how was your day?’} );Thursday, March 24, 2011

17.
And Play With Different Properties new google.visualization.PieChart(target).draw( view, { title: ‘So, how was your day?’, is3D: true, colors: [#0099ff, #00ff99, #9900ff] } );Thursday, March 24, 2011

18.
Putting It All Together: Music Age Demo ★ Scrape data from an HTML table and put it into a DataTable ★ Dynamically create a legend for choosing what to graph ★ Make line graphs and bar charts from selected data pointsThursday, March 24, 2011

19.
Table Scrapin’ Fun var tableHeaders = $(table th); var tableData = $(table tbody tr); data = new google.visualization.DataTable(); for (i=0; i<tableHeaders.length; i++) { var cell = tableHeaders[i].innerHTML; var cellType = number; if (i==0) { cellType = string; } data.addColumn(cellType, cell); }Thursday, March 24, 2011

20.
More Table Scrapin’ Fun for (i=0; i<tableData.length; i++) { var row = $(tableData[i]).children(); var rowData = new Array(); for (j=0; j<row.length; j++) { var cell = row[j].innerHTML; if (!cell.match(/[a-zA-Z_.-?!+]/)) { cell = Number(cell) } rowData.push(cell); } data.addRow(rowData); }Thursday, March 24, 2011

21.
Preppin’ The View var artists = $(#legend li); var selectedArtists = [0]; $(table .on).removeClass(on); $(table tr).children(:nth-child(1)).addClass(on); for (i=0; i<artists.length; i++) { if (!$(artists[i]).hasClass(off)) { selectedArtists.push(i+1); $(table tr).children( :nth-child(+ (i+2) +) ).addClass(on); } } var view = new google.visualization.DataView(data); view.setColumns(selectedArtists);Thursday, March 24, 2011

22.
Drawin’ The Line Chart $(#line).html(); var lineChart = new google.visualization.LineChart( document.getElementById(line) ); lineChart.draw(view, { width: 500, height: 350, enableTooltip: true, showCategories: true, legend: none, max: 75, pointSize: 5 });Thursday, March 24, 2011

23.
Drawin’ The Bar Chart $(#bar).html(); var chart = new google.visualization.ColumnChart( document.getElementById(bar) ); chart.draw(view, { width: 500, height: 350, enableTooltip: true, showCategories: true, legend: none, max: 75, is3D: true });Thursday, March 24, 2011

24.
Constructing Static Charts Time to put your thinking cap onThursday, March 24, 2011

25.
What is the Google Chart API? “The Google Chart API lets you dynamically generate charts with a URL string. You can embed these charts on your web page, or download the image for local or offline use.” –– Google Chart DocumentationThursday, March 24, 2011

26.
Build a URL, Get a ChartThursday, March 24, 2011

27.
What types of charts can you make?Thursday, March 24, 2011

28.
Every Chart Starts With A URL http://chart.googleapis.com/chart? Parameters come after the question mark separated by ampersands (&) The order of parameters doesn’t matterThursday, March 24, 2011

29.
Requires 3 Things ★ Chart Type (cht=<chart type>) ★ Chart Size (chs=<width>x<height>) ★ Data (chd=<data string>) ★ http://chart.googleapis.com/chart? cht=p3&chs=250x100&chd=t:60,40Thursday, March 24, 2011

30.
Data Formats ★ Basic Text Format (chd=t:) ★ Simple Encoding (chd=s:) ★ Extended Encoding (chd=e:) ★ Some formats use less characters than others.Thursday, March 24, 2011

31.
Basic Text Data Format ★ Floating Point Values From 0-100 ★ Values less than 0 are considered NULL ★ Values higher than 100 are truncated to 100 ★ What you see is what you get ★ Ideal for smaller datasets ★ Produces the largest number of charactersThursday, March 24, 2011

32.
Basic Text Data Example ★ chd=t:_30,-30,50,80,200Thursday, March 24, 2011

33.
Simple Encoding Data Format ★ Integer values 0-61 ★ Relative Scaling ★ Low Granularity ★ Each value encoded as a single alphanumeric character ★ Produces the smallest number of charactersThursday, March 24, 2011

34.
Simple Encoding Function var simpleEncoding = ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789 //Scales submitted values so that maxVal becomes the highest. function simpleEncode(valueArray, maxValue) { var chartData = [s:]; for (var i = 0; i < valueArray.length; i++) { var currentValue = valueArray[i]; if (!isNaN(currentValue) && currentValue >= 0) { chartData.push(simpleEncoding.charAt( Math.round((simpleEncoding.length-1) * currentValue / maxValue)) ); } else { chartData.push(_); } } return chartData.join(); }Thursday, March 24, 2011

35.
Simple Encoding Example ★ chd=t:1,19,27,53,61,-1|12,39,57,45,51,27 ★ chd=s:BTb19_,Mn5tzbThursday, March 24, 2011

36.
Extended Data Format ★ Integer values 0-4095 ★ Relative scaling ★ High Granularity ★ Each value encoded as two alphanumeric charactersThursday, March 24, 2011

37.
Extended Encoding Function Similar to Simple Encoding Function but too big to show here. Grab it at http://code.google.com/apis/chart/docs/ data_formats.html#encoding_dataThursday, March 24, 2011

38.
Extended Encoding Example ★ chd=t:90,1000,2700,3500|3968,-1,1100,250 ★ chd=e:BaPoqM2s,-A__RMD6Thursday, March 24, 2011

39.
Data Scaling ★ chds=<min-value>, <max-value> ★ Related to the data format you use!Thursday, March 24, 2011

40.
Axis Scaling ★ chxr=<axis_index>,<start_val>,<end_val>, <opt_step> ★ Axis labels are not calculated to reflect chart data automatically! (We do that ourselves) ★ If you’re data is 0-100, then you’re good!Thursday, March 24, 2011

41.
Axis Scaling ExampleThursday, March 24, 2011

42.
Year In The News Interactive ★ Load a bunch of data into a DataTable ★ User selects which data points they want to see ★ Render a series of static Google Charts ★ Shareable ChartsThursday, March 24, 2011

43.
Official Documentation ★ DataTable & DataView Docs ★ Google Visualization API ★ Google Charts APIThursday, March 24, 2011

44.
Chart Tools ★ Chart Wizard Easy Interface for Building Charts ★ Live Chart Playground Easy way to edit parameters ★ Google Code Playground Online Charting Development EnvironmentThursday, March 24, 2011

45.
More Links ★ Easy Graphs with Google Chart Tools|Nettuts+ ★ jQuery Google Chart Plugin ★ List of Google Chart Wrappers ★ Animating Static Google ChartsThursday, March 24, 2011

46.
Sharing Is Caring ★ Grab everything from this presentation via SVN http://svn.kingkool68.com/projects/google- charting-api/ ★ List of Links Mentioned ★ Stay in Touch @kingkool68 or Facebook or shoot me an e-mailThursday, March 24, 2011

47.
And Remember...Thursday, March 24, 2011

48.
Play and Have Fun! It’s the only way to learn.Thursday, March 24, 2011

49.
Thank You! Please say hi to me later, share your thoughts, and ask questions.Thursday, March 24, 2011