--- order: 4 --- # Gant diagrams > A Gantt chart is a type of bar chart, first developed by Karol Adamiecki in 1896, and independently by Henry Gantt in the 1910s, that illustrates a project schedule. Gantt charts illustrate the start and finish dates of the terminal elements and summary elements of a project. Mermaid can render Gantt diagrams. The code snippet below: ``` %% Example of sequence diagram gantt title A Gantt Diagram section Section A task :a1, 2014-01-01, 30d Another task :after a1 , 20d section Another Task in sec :2014-01-12 , 12d anther task : 24d ``` Renders the following diagram: ```mermaid gantt title A Gantt Diagram dateFormat YYYY-MM-DD section Section A task :a1, 2014-01-01, 30d Another task :after a1 , 20d section Another Task in sec :2014-01-12 , 12d anther task : 24d ``` ## Syntax ``` %% Example with slection of syntaxes gantt dateFormat YYYY-MM-DD title Adding GANTT diagram functionality to mermaid section A section Completed task :done, des1, 2014-01-06,2014-01-08 Active task :active, des2, 2014-01-09, 3d Future task : des3, after des2, 5d Future task2 : des4, after des3, 5d section Critical tasks Completed task in the critical line :crit, done, 2014-01-06,24h Implement parser and jison :crit, done, after des1, 2d Create tests for parser :crit, active, 3d Future task in critical line :crit, 5d Create tests for renderer :2d Add to mermaid :1d section Documentation Describe gantt syntax :active, a1, after des1, 3d Add gantt diagram to demo page :after a1 , 20h Add another diagram to demo page :doc1, after a1 , 48h section Last section Describe gantt syntax :after doc1, 3d Add gantt diagram to demo page : 20h Add another diagram to demo page : 48h ``` Renders like below: ```mermaid gantt dateFormat YYYY-MM-DD title Adding GANTT diagram functionality to mermaid section A section Completed task :done, des1, 2014-01-06,2014-01-08 Active task :active, des2, 2014-01-09, 3d Future task : des3, after des2, 5d Future task2 : des4, after des3, 5d section Critical tasks Completed task in the critical line :crit, done, 2014-01-06,24h Implement parser and jison :crit, done, after des1, 2d Create tests for parser :crit, active, 3d Future task in critical line :crit, 5d Create tests for renderer :2d Add to mermaid :1d section Documentation Describe gantt syntax :active, a1, after des1, 3d Add gantt diagram to demo page :after a1 , 20h Add another diagram to demo page :doc1, after a1 , 48h section Last section Describe gantt syntax :after doc1, 3d Add gantt diagram to demo page : 20h Add another diagram to demo page : 48h ``` ### title Tbd ## Sections statements Tbd ## Setting dates Tbd ### Date format Tbd #### Diagram definition Input Example Description: ``` YYYY 2014 4 digit year YY 14 2 digit year Q 1..4 Quarter of year. Sets month to first month in quarter. M MM 1..12 Month number MMM MMMM January..Dec Month name in locale set by moment.locale() D DD 1..31 Day of month Do 1st..31st Day of month with ordinal DDD DDDD 1..365 Day of year X 1410715640.579 Unix timestamp x 1410715640579 Unix ms timestamp Input Example Description H HH 0..23 24 hour time h hh 1..12 12 hour time used with a A. a A am pm Post or ante meridiem m mm 0..59 Minutes s ss 0..59 Seconds S 0..9 Tenths of a second SS 0..99 Hundreds of a second SSS 0..999 Thousandths of a second Z ZZ +12:00 Offset from UTC as +-HH:mm, +-HHmm, or Z ``` More info in: http://momentjs.com/docs/#/parsing/string-format/ #### Scale ``` %a - abbreviated weekday name. %A - full weekday name. %b - abbreviated month name. %B - full month name. %c - date and time, as "%a %b %e %H:%M:%S %Y". %d - zero-padded day of the month as a decimal number [01,31]. %e - space-padded day of the month as a decimal number [ 1,31]; equivalent to %_d. %H - hour (24-hour clock) as a decimal number [00,23]. %I - hour (12-hour clock) as a decimal number [01,12]. %j - day of the year as a decimal number [001,366]. %m - month as a decimal number [01,12]. %M - minute as a decimal number [00,59]. %L - milliseconds as a decimal number [000, 999]. %p - either AM or PM. %S - second as a decimal number [00,61]. %U - week number of the year (Sunday as the first day of the week) as a decimal number [00,53]. %w - weekday as a decimal number [0(Sunday),6]. %W - week number of the year (Monday as the first day of the week) as a decimal number [00,53]. %x - date, as "%m/%d/%Y". %X - time, as "%H:%M:%S". %y - year without century as a decimal number [00,99]. %Y - year with century as a decimal number. %Z - time zone offset, such as "-0700". %% - a literal "%" character. ``` More info in: https://github.com/mbostock/d3/wiki/Time-Formatting ## Styling Styling of the a sequence diagram is done by defining a number of css classes. During rendering these classes are extracted from the ### Classes used Class | Description --- | --- actor | Style for the actor box at the top of the diagram. text.actor | Styles for text in the actor box at the top of the diagram. actor-line | The vertical line for an actor. messageLine0 | Styles for the solid message line. messageLine1 | Styles for the dotted message line. messageText | Defines styles for the text on the message arrows. labelBox | Defines styles label to left in a loop. labelText | Styles for the text in label for loops. loopText | Styles for the text in the loop box. loopLine | Defines styles for the lines in the loop box. note | Styles for the note box. noteText | Styles for the text on in the note boxes. ### Sample stylesheet ```css .grid .tick { stroke: lightgrey; opacity: 0.3; shape-rendering: crispEdges; } .grid path { stroke-width: 0; } #tag { color: white; background: #FA283D; width: 150px; position: absolute; display: none; padding:3px 6px; margin-left: -80px; font-size: 11px; } #tag:before { border: solid transparent; content: ' '; height: 0; left: 50%; margin-left: -5px; position: absolute; width: 0; border-width: 10px; border-bottom-color: #FA283D; top: -20px; } .taskText { fill:white; text-anchor:middle; } .taskTextOutsideRight { fill:black; text-anchor:start; } .taskTextOutsideLeft { fill:black; text-anchor:end; } ``` ## Configuration Is it possible to adjust the margins for rendering the sequence diagram. This is done by defining the **sequenceConfig** part of the configuration object. Read more about it [here](http://knsv.github.io/mermaid/index.html#configuration28). How to use the CLI is described in the [mermaidCLI]((http://knsv.github.io/mermaid/index.html#mermaidCLI) page.