Is it possible to color the days in the default Gantt Diagram?

asked Sep 3, 2021 in Question / help by SuperSaiyanGod (340 points)

For the Gantt Diagram of the calendar form (that starts with something like

Project starts the 2020/09/01

), you can color the days with the following statement:

2020/09/13 to 2020/09/16 are colored in lightblue

But it seems impossible to color the days without that initial statement. (I tried "Day1" and "Day 1", but neither worked.)

(It may sounds a bit strange, but I'm currently using Gantt Diagram to demonstrate how variables change in a program process, so the calendar form isn't what I want.)

commented Sep 3, 2021 by The-Lu (85,820 points)

Hello. S,

What is 'Day1' or 'Day 1'?

Regards,
Th.

commented Sep 16, 2021 by The-Lu (85,820 points)

Hello S.,

I'm currently using Gantt Diagram to demonstrate how variables change in a program process, so the calendar form isn't what I want.

Have you an example of your works in progress...
in order to confirm the implementation, and also to put with all the other doc.

Regards,
Th.

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1 Answer

answered Sep 3, 2021 by The-Lu (85,820 points)

Hello S.,

Here is a proposal:

@startgantt
<style>
ganttDiagram {
  timeline {
    'LineColor transparent
    FontColor transparent
  }
}
</style>

hide footbox
project starts the 2021/01/01
2021/01/05 to 2021/01/07 are colored in lightblue

[Var. A] as [A] lasts 9 days
[Var. B] as [B] lasts 5 days
[B] starts at [A]'s end
[A] is colored in Fuchsia/FireBrick
[B] is colored in GreenYellow/Green

2021/01/11 is colored in gold
2021/01/12 is colored in orange
2021/01/13 is colored in red
-- note --
@endgantt

See also doc. here; see 'Clean style', on:

If that can help,
Regards,
Th.

commented Sep 6, 2021 by SuperSaiyanGod (340 points)

"Day 1" and "Day1" are just like the date in the statement

2021/01/11 is colored in gold

except that they represent the first day in the diagram. I don't want to use exact dates because, basically, I just care about how many days have passed since the first day.

commented Sep 6, 2021 by The-Lu (85,820 points)

Hello S.,

Perhaps, you can create a 'wanted feature' for that.

Regards,
Th.

commented Sep 14, 2021 by plantuml (297,300 points)

Last beta http://beta.plantuml.net/plantuml.jar supports now "D+xx" notation. So you can have:

@startgantt
project starts the 2021/01/01
2021/01/05 to 2021/01/07 are colored in lightblue
D+13 to D+15 are colored in blue

[Var. A] as [A] lasts 9 days
[Var. B] as [B] lasts 5 days
[C] lasts 10 days
[B] starts at [A]'s end
[A] is colored in Fuchsia/FireBrick
[B] is colored in GreenYellow/Green
[C] starts at D+16

D+10 is colored in gold
D+11 is colored in orange
D+8 is colored in red
-- note --
@endgantt

http://www.plantuml.com/plantuml/uml/NL7BJiGm3BpxAtpZW4hRHULnMmfQ_W09hJYOrce3KO8Shn1_Jrowx2fIfB5cnXudsIObqOc2Adn9_E11SQ4IwiouQJPjtTY1_x93ZIVX5aaOX-YZy8Wke7VJhE_-mF1qsLwRDsDNkXO3x5z8hl3X3IdXFeEdb8FlSQIVj8hzdzWVnMuL7uz4swnCjgoRazgqYuGSHh2vBfrdxmx3d1pLEoVSYni-Ss_fUHRcyChUn-zwgItnDD_kT0C06PgYSuf-DBuj-2WK9dkKkqB805M58IfZLS4sBxtynoy0

Is this what you were looking for ?

commented Sep 14, 2021 by The-Lu (85,820 points)

Hello PlantUML team,

Fine, but:

Is it possible to works without 'project start date', like:

@startgantt

D+13 to D+15 are colored in blue

[Var. A] as [A] lasts 9 days
[Var. B] as [B] lasts 5 days
[C] lasts 10 days
[B] starts at [A]'s end
[A] is colored in Fuchsia/FireBrick
[B] is colored in GreenYellow/Green
[C] starts at D+16

D+10 is colored in gold
D+11 is colored in orange
D+8 is colored in red
-- note --
@endgantt

With 'D' is the first day and 'D+1' the second day, and so on...

Regards,
Th.

commented Sep 15, 2021 by plantuml (297,300 points)

You're right!

With last beta http://beta.plantuml.net/plantuml.jar you can now have :

@startgantt
D+13 to D+15 are colored in blue

[Var. A] as [A] lasts 9 days
[Var. B] as [B] lasts 5 days
[C] lasts 10 days
[B] starts at [A]'s end
[A] is colored in Fuchsia/FireBrick
[B] is colored in GreenYellow/Green
[C] starts at D+16

D+10 is colored in gold
D+11 is colored in orange
D+8 is colored in red
-- note --
@endgantt

There is a slight issue: for example D+8 (is in red) is a shortcut for D9 (see red column in the example).

This is because D+0 is the first day (1), D+1 is the second day (2).

It's logical but it's weird. Maybe we should number day starting at 0 on the drawing instead of 1.

What do you think about it ?

commented Sep 16, 2021 by The-Lu (85,820 points)

Hello PlantUML team,

There is a slight issue: for example D+8 (is in red) is a shortcut for D9 (see red column in the example).
This is because D+0 is the first day (1), D+1 is the second day (2).
It's logical but it's weird. Maybe we should number day starting at 0 on the drawing instead of 1.
What do you think about it ?

Without going into controversy on the 'Zero-based_numbering'.

If it is easier to understand, why not change to:

D+1 is the first day (1), D+2 is the second day (2).

But how to consolidate the two kind of uses:

Code

Output

@startgantt
project starts the 2021/01/10

D+5 to D+7 are colored in blue

[C] lasts 2 days
[C] starts at D+1

D+10 is colored in gold
D+11 is colored in orange
D+12 is colored in red

@endgantt

Why D+12 is not red ???

@startgantt
' Without project start date
D+5 to D+7 are colored in blue

[C] lasts 2 days
[C] starts at D+1

D+10 is colored in gold
D+11 is colored in orange
D+12 is colored in red

@endgantt

Perhaps create 2 behaviours, depending if there is a start date (if it is the 10-01-2021):

then D+0 is the start date, D+1 is the first day after start date (11-01-2021), D+2 is the second day (12-01),...

or if there is not start date (only number):

in that case: D+1 is the first day (1), D+2 is the second day (2), ...

Hoping that I am clear.
Regards,
Th.

commented Nov 28 by MarioKusek (100 points)

Is it possible to add M for months? In long projects we count everything in months. So task "requires 5 months" or "task starts M+4" for task starting in the beginning of month 5.

commented Nov 28 by plantuml (297,300 points)

It would be possible, but only if M always represented exactly 30 days, which is not necessarily accurate.
Would that still be acceptable for you? It could lead to some confusion.

commented Nov 29 by MarioKusek (100 points)

That would be fine for quick fix and estimated gantt.

commented Nov 29 by plantuml (297,300 points)

With last snapshot https://github.com/plantuml/plantuml/releases/tag/snapshot

you can have:

https://editor.plantuml.com/uml/SoWkIImgIK_CAodXYdQCLSX9B2ufLZ1II4ciBEQATa88bAUcPWD5d14YkVbv9Hd5N0wfUIaG_G00

Hope this helps!

commented Nov 29 by MarioKusek (100 points)

Thanks this helps a lot.

It is not perfect. If I can help please contact me.

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