Prerequisites : Matplotlib Introduction
In this article, we will be discussing how to plot a Gantt Chart in Python using Matplotlib.
A Gantt chart is a graphical depiction of a project schedule or task schedule (In OS). It’s is a type of bar chart that shows the start and finish dates of several elements of a project that include resources or deadline. The first Gantt chart was devised in the mid-1890s by Karol Adamiecki, a Polish engineer who ran a steelworks in southern Poland and had become interested in management ideas and techniques. Some 15 years after Adamiecki, Henry Gantt, an American engineer, and project management consultant, devised his own version of the chart which became famous as “Gantt Charts”.
Some Uses of Gantt Charts :
- Project Scheduling.
- Task Scheduling on Processors
A sample Gantt Chart for task sheduling is shown below:
We will be using
broken_barh types of graph available in matplotlib to draw gantt charts.
Below is the code for generating the above ganntt chart :
Lets’s understand the different pieces of codes one by one :
fig, gnt = plt.subplots()
Here, we declared a figure “gnt” for plotting the chart.
gnt.set_ylim(0, 50) gnt.set_xlim(0, 160)
Here, we declared the limits of X-axis and Y-axis of the chart. By default the lower X-axis and Y-axis limit is 0 and higher limits for both axis is 5 unit more the highest X-axis value and Y-axis value.
gnt.set_xlabel('seconds since start') gnt.set_ylabel('Processor')
Here, we added labels to the axes. By default, there is no labels.
gnt.set_yticks([15, 25, 35]) gnt.set_yticklabels(['1', '2', '3'])
Here, we added ticks in Y-axis. We can also label them. By default the axes is divides uniformly in the limits.
Here, we set
grid()to True to show grids. By default, it is False.
gnt.broken_barh([(40, 50)], (30, 9), facecolors=('tab:orange'))
Here, we added a bar in the chart. In this example, this bar represent the operation going on for time 40 to (40+50)= 90 sec.
The basic arguments :
gnt.broken_barh([(start_time, duration)], (lower_yaxis, hieght), facecolors=('tab:colours'))
By default colour is set to Blue.
We can declare multiple bars at the same time :
gnt.broken_barh([(10, 50), (100, 20), (130, 10)], (20, 9), facecolors=('tab:red'))
We can also add edgecolour by setting “edgecolor” attribute to any colour.
We saved the figure formed in the png file.
Reference : Broken Barh Example Matplotlib Documentation
- Python | Introduction to Matplotlib
- Python | Working with PNG Images using Matplotlib
- Python | Matplotlib.pyplot ticks
- Python | Matplotlib Sub plotting using object oriented API
- Python | Visualize graphs generated in NetworkX using Matplotlib
- Python | Plotting an Excel chart with Gradient fills using XlsxWriter module
- Python | Plotting an Excel chart with pattern fills in column using XlsxWriter module
- Basic Operators in Python
- Basic calculator program using Python
- A basic Python Programming Challenge
- Python Program for Basic Euclidean algorithms
- Python | Basic Program Crash Debugging
- Different plotting using pandas and matplotlib
- Basic Slicing and Advanced Indexing in NumPy Python
- Pandas | Basic of Time Series Manipulation
If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to email@example.com. See your article appearing on the GeeksforGeeks main page and help other Geeks.
Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.