Rendering charts on server side

Using Google Apps Script to generate chart images

Requrements

Google Account
Ruby environment (Google App Script can be called from any other)

Installation

Google Script Setup

Go to my drive
NEW -> Google Apps Script (you may need to authorize this 'app' to your Drive)
Give a name to project
Copy Code.gs to your Code.gs file
GO TO on Publish -> Deploy as API executable
Describe version
Choose access to script

Only myself: you will have to authorize Google App with account that owns script to have access to this script
Anyone: you can own script with Account 1 and authorize Google that will execute script with any other Google Account

Deploy
GO TO Resource -> Cloud Platform project Google creates cloud project that is connected to your script by default. You can change project by entering project number in Change Project section
GO TO Cloud platform project connected to script
GO TO APIs & service -> Library -> Find "Google Apps Script Execution API" and enable it
GO TO APIs & service -> Credentials ->
Create Credentials -> OAuth client ID -> Choose Other -> Create
Download json of that credentials
Rename json file to clients-secret.json and move it to same folder where is located ruby file

Ruby (Script can be used with any language that can handle HTTP requests)

gem install google-api-client
Download file charts-generator.rb
Change SCRIPT_ID, line 12 (Can be found in Google Apps Script file, File -> Project properties)

Usage

Run ruby generate.rb

Limitations

Google Apps Script execution limitation - 6 min duration
Script Execution API executions per 100 seconds - 1,500
Script Execution API executions per day - unlimited

Feel free to fork this repo! Have fun!

To see more capabilities of Google Apps Script check this link

To see more about Google Charts check this link