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Theming
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With Version 8.7.0 Mermaid comes out with a system for dynamic and integrated setting of the diagram's theme. The objective of this is to increase the customizability of mermaid, by allowing for the customization of themes through the %%init%% directive and initialize. With it a site integrator can override a vast majority of attributes used when rendering a diagram.
Themes, for all intents and purposes also follow the Levels of Configuration and employ directives to modify configurations, as they were introduced in Version 8.6.0.
Site-wide Themes
Site-wide themes are still declared via initialize by site owners.
Example of Initalize call:
mermaidAPI.initialize({
'securityLevel': 'loose', 'theme': 'base'
});
Notes: Only site owners can use the mermaidAPI.initialize call to set values. Site-Users will have to use %%init%% to modify configurations, everytime they create a diagram.
Themes at the Local or Current Level
When Generating a diagram using on a webpage that supports mermaid. It is also possible to override site-wide theme settings locally, for a specific diagram, using directives, as long as it is not prohibited by the secure array.
%%{init: {'theme':'base'}}%%
graph TD
a --> b
Here is an example of how %%init%% can set the theme to 'base', this assumes that themeVariables are set to default:
mermaid
%%{init: {'theme':'base'}}%%
graph TD
A[Christmas] -->|Get money| B(Go shopping)
B --> C{Let me think}
B --> G[/Another/]
C ==>|One| D[Laptop]
C -->|Two| E[iPhone]
C -->|Three| F[fa:fa-car Car]
subgraph section
C
D
E
F
G
end
Making a Custom Theme with themeVariables
The easiest way to make a custom theme is to start with the base theme, and just modify theme variables through themeVariables, via %%init%%.
| Parameter | Description | Type | Required | Objects contained |
|---|---|---|---|---|
| themeVariables | Array containing objects, modifiable with the %%init%% directive |
Array | Required | primaryColor, lineColor, textColor |
Notes: Leaving it empty will set the values to default
- primaryColor- the base color for the theme
- lineColor- the line color for the theme
- textColor-the text color for the theme
**Here is an example of overriding primaryColor and giving everything a ifferent look, using %%init%%.
mermaid
%%{init: {'theme':'base', 'themeVariables': {primaryColor: '#ff0000'}}%%
graph TD
A[Christmas] -->|Get money| B(Go shopping)
B --> C{Let me think}
B --> G[/Another/]
C ==>|One| D[Laptop]
C -->|Two| E[iPhone]
C -->|Three| F[fa:fa-car Car]
subgraph section
C
D
E
F
G
end
The Theming Engine does not admit color codes and will only accept proper color values. Color Names is not supported so for instance, the color value 'red' will not work, but '#ff0000' will work.
Examples:
When adjusting a theme it might be helpful to look at the theme with these diagrams to evaluate that everything is visible and looks good.
In the following examples, the directive init is used, with the theme being declared as base. for more information on this, read the documentation for Version 8.6.0
Flowchart
%%{init: {'securityLevel': 'loose', 'theme':'base'}}%%
graph TD
A[Christmas] -->|Get money| B(Go shopping)
B --> C{Let me think}
B --> G[/Another/]
C ==>|One| D[Laptop]
C -->|Two| E[iPhone]
C -->|Three| F[fa:fa-car Car]
subgraph section
C
D
E
F
G
end
%%{init: {'securityLevel': 'loose', 'theme':'base'}}%%
graph TD
A[Christmas] -->|Get money| B(Go shopping)
B --> C{Let me think}
B --> G[/Another/]
C ==>|One| D[Laptop]
C -->|Two| E[iPhone]
C -->|Three| F[fa:fa-car Car]
subgraph section
C
D
E
F
G
end
Flowchart (beta)
mermaid
%%{init: {'securityLevel': 'loose', 'theme':'base'}}%%
flowchart TD
A[Christmas] -->|Get money| B(Go shopping)
B --> C{Let me think}
B --> G[Another]
C ==>|One| D[Laptop]
C x--x|Two| E[iPhone]
C o--o|Three| F[fa:fa-car Car]
subgraph section
C
D
E
F
G
end
Sequence diagram
mermaid
%%{init: {'securityLevel': 'loose', 'theme':'base'}}%%
sequenceDiagram
autonumber
par Action 1
Alice->>John: Hello John, how are you?
and Action 2
Alice->>Bob: Hello Bob, how are you?
end
Alice->>+John: Hello John, how are you?
Alice->>+John: John, can you hear me?
John-->>-Alice: Hi Alice, I can hear you!
Note right of John: John is perceptive
John-->>-Alice: I feel great!
loop Every minute
John-->Alice: Great!
end
Gantt
mermaid
gantt
dateFormat :YYYY-MM-DD
title Adding GANTT diagram functionality to mermaid
excludes :excludes the named dates/days from being included in a charted task..
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
State diagram
mermaid
%%{init: {'securityLevel': 'loose', 'theme':'base'}}%%
stateDiagram
[*] --> Active
state Active {
[*] --> NumLockOff
NumLockOff --> NumLockOn : EvNumLockPressed
NumLockOn --> NumLockOff : EvNumLockPressed
--
[*] --> CapsLockOff
CapsLockOff --> CapsLockOn : EvCapsLockPressed
CapsLockOn --> CapsLockOff : EvCapsLockPressed
--
[*] --> ScrollLockOff
ScrollLockOff --> ScrollLockOn : EvCapsLockPressed
ScrollLockOn --> ScrollLockOff : EvCapsLockPressed
}
state SomethingElse {
A --> B
B --> A
}
Active --> SomethingElse
note right of SomethingElse : This is the note to the right.
SomethingElse --> [*]
State diagram (beta)
mermaid
%%{init: {'securityLevel': 'loose', 'theme':'base'}}%%
stateDiagram-v2
[*] --> Active
state Active {
[*] --> NumLockOff
NumLockOff --> NumLockOn : EvNumLockPressed
NumLockOn --> NumLockOff : EvNumLockPressed
--
[*] --> CapsLockOff
CapsLockOff --> CapsLockOn : EvCapsLockPressed
CapsLockOn --> CapsLockOff : EvCapsLockPressed
--
[*] --> ScrollLockOff
ScrollLockOff --> ScrollLockOn : EvCapsLockPressed
ScrollLockOn --> ScrollLockOff : EvCapsLockPressed
}
state SomethingElse {
A --> B
B --> A
}
Active --> SomethingElse2
note right of SomethingElse2 : This is the note to the right.
SomethingElse2 --> [*]
Entity Relations diagram
mermaid
erDiagram
CUSTOMER }|..|{ DELIVERY-ADDRESS : has
CUSTOMER ||--o{ ORDER : places
CUSTOMER ||--o{ INVOICE : "liable for"
DELIVERY-ADDRESS ||--o{ ORDER : receives
INVOICE ||--|{ ORDER : covers
ORDER ||--|{ ORDER-ITEM : includes
PRODUCT-CATEGORY ||--|{ PRODUCT : contains
PRODUCT ||--o{ ORDER-ITEM : "ordered in"
User journey diagram
mermaid
journey
title My working day
section Go to work
Make tea: 5: Me
Go upstairs: 3: Me
Do work: 1: Me, Cat
section Go home
Go downstairs: 5: Me
Sit down: 5: Me