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Produce Gantt charts using the Google Charts API

Project description

Author: Adam Bard,

This api is designed to allow you to easily and quickly create gantt charts using the Google Charts API. You can save them as images or just produce a URL.

It works swell as long as you want things measured in days.

The method of producing such a chart is heavily influenced by this post by Dave Goerlich. Thanks, Dave.

Quick Start Example

from googlegantt import GanttChart, GanttCategory

gc = GanttChart('Test Chart', width=650, height=200, progress=(2011, 02, 27))

on_time = GanttCategory('On Time', '0c0')
late = GanttCategory('Late', 'c00')
upcoming = GanttCategory('Upcoming', '00c')

t1 = gc.add_task('Late Task', (2011, 02, 20), (2011, 02, 25), category=late)
t2 = gc.add_task('On Time Task', depends_on=t1, duration=3, category=on_time)
t3 = gc.add_task('Future Task', depends_on=t2, duration=7, category=upcoming)

url = gc.get_url()
image = gc.get_image()



  • Optional Progress indicator shades the elapsed area of the chart.
  • Flexible chart width and height.
  • Specify task colors using css rules.
  • Flexibly specify dates using objects, or tuples.
  • Produce a Google Chart url, or a png image (requires PIL).
  • Date span is automatically computed from tasks.


There are 3 primary classes involved in the creation of a chart.


GanttChart(title,[ **kwargs])

Produce a Gantt Chart.

Keyword Arguments:

  • width The width of the chart.
  • height The height of the chart.
  • progress A date representing the current time, to produce a shaded ‘elapsed’ region.

Example initialization:

gc = GanttChart('Test Chart', width=600, height=200, progress=(2011, 02, 27))


  • GanttChart.get_url() Get a Google Charts URL of the chart, for direct access
  • GanttChart.get_image() Get a PIL Image object, to be manipulated
  • GanttChart.get_image(save_path) Save a .png image to save_path


Optional in common usage. Represents a class of Tasks with a color and a title.

GanttCategory(title[, color])

Produce a category object with a given color. Color is specified using a hex string, and will be converted to an 8-byte rgba hex color string expected by Google Charts from any of the following formats:

  • 3-byte, e.g. ‘f00’ => ‘FF0000FF’
  • 4-byte, e.g. ‘f00c’ => ‘FF0000CC’
  • 6-byte, e.g. ‘ff0000’ => ‘FF0000FF’
  • 8-byte


Represents a single bar in the chart. Must have a specified start and end date, although these can be computed in different ways.

GanttTask(title[, start_date=None, end_date=None[, **kwargs]])

Keyword Arguments:

  • start_date The start date of the task
  • end_date The end date of the task
  • duration The duration, in days, of the task. May be used instead of end_date
  • depends_on A GanttTask that must be completed before this one can begin. May be used instead of start_date
  • category A GanttCategory to apply to this task.
  • color A quick way to specify color. Don’t use this when you have categories declared, you will get blank legend entries.

Either start_date or depends_on must be specified. Same with end_date and duration.

If both start_date and depends_on are specified, depends_on is used.

If both end_date and duration are specified, duration is used.

More Information

Check out the doctests in the file for more information.


Copyright (c) 2011 Adam Bard (

Licensed under the MIT License:

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