#149 Calculate missing legend colors based on brightness

[kirchsth]

This feature requires PlantUML version >= v1.2021.6! (an workaround is added that older versions uses fix a dark background color and a light text color)

1. Based on the new PlantUML call %is_dark() the missing legend color can be calculated with better contrast (e.g. dark text colors get automatically a light background color if no background color is defined).
2. Instead of the (typically unused) "violet" based color a better matching "khaki" based color is used.

It can be tested via my extended branch.

techn. details: the PlantUML server has some caching problems with included files. If you test/use it with already rendered files on the PlantUML server please add e.g. a space to the diagram that a new version is calculated. (@Potherca: I hope it will be fixed in the meantime, otherwise please add a space to the 2 diagrams in the master branch too, ~30 min after the first merge)

BR Helmut

used source

@startuml
!include https://raw.githubusercontent.com/kirchsth/C4-PlantUML/extended/C4_Container.puml

AddElementTag("v1.0", $borderColor="#d73027")
AddElementTag("v1.1", $fontColor="#d73027")
AddElementTag("backup", $fontColor="orange")

AddRelTag("backup", $textColor="orange", $lineColor="orange")

Person(user, "Customer", "People that need products")
Person(admin, "Administrator", "People that administrates the products via the new v1.1 components", $tags="v1.1")
Container(spa, "SPA", "angular", "The main interface that the customer interacts with via v1.0", $tags="v1.0")
Container(spaAdmin, "Admin SPA", "angular", "The administrator interface that the customer interacts with via new v1.1", $tags="v1.1")
Container(api, "API", "java", "Handles all business logic (incl. new v1.1 extensions)", $tags="v1.0+v1.1")
ContainerDb(db, "Database", "Microsoft SQL", "Holds product, order and invoice information")
Container(archive, "Archive", "Audit logging", "Stores 5 years", $tags="backup")


Rel(user, spa, "Uses", "https")
Rel(spa, api, "Uses", "https")
Rel_R(api, db, "Reads/Writes")
Rel(admin, spaAdmin, "Uses", "https")
Rel(spaAdmin, api, "Uses", "https")
Rel_L(api, archive, "Writes", "messages", $tags="backup")

SHOW_LEGEND()
@enduml

@startuml
!include https://raw.githubusercontent.com/kirchsth/C4-PlantUML/extended/C4_Component.puml

UpdateElementStyle(person, $fontColor="green")
AddElementTag("v1.0", $fontColor="#d73027", $borderColor="#d73027")
AddElementTag("v1.1", $fontColor="#ffffbf", $borderColor="#ffffbf")
AddElementTag("v1.0&v1.1", $fontColor="#fdae61", $borderColor="#fdae61")
AddElementTag("fallback", $bgColor="#444444")

AddElementTag("micro service", $shape=EightSidedShape())
AddElementTag("storage", $shape=RoundedBoxShape())

UpdateRelStyle(black, black)
AddRelTag("service1", $textColor="red")
AddRelTag("service2", $lineColor="red")
AddRelTag("service1&service2", $textColor="red", $lineColor="red")

Container(spa, "SPA", "angular", "The main interface that the customer interacts with via v1.0", $tags="v1.0")
Container(spaAdmin, "Admin SPA", "angular", "The administrator interface that the customer interacts with via new v1.1", $tags="v1.1")
Container(api, "API", "java", "Handles all business logic (incl. new v1.1 extensions)", $tags="v1.0&v1.1+v1.0+v1.1")
Container(spa2, "SPA2", "angular", "The main interface that the customer interacts with via v1.0", $tags="v1.0+fallback")
Container(spaAdmin2, "Admin SPA2", "angular", "The administrator interface that the customer interacts with via new v1.1", $tags="fallback+v1.1")

Container(services, "Services", "techn", $tags="micro service")
Container(fileStorage, "File storage", "techn", $tags="storage")

Rel(spa, api, "Uses", "https")
Rel(spaAdmin, api, "Uses", "https")
Rel_L(spa, spa2, "Updates", "https")
Rel_R(spaAdmin, spaAdmin2, "Updates", "https")

Rel_D(api, services, "uses service1 via this call", $tags="service1")
Rel_D(api, services, "uses service2 via this call", $tags="service2")
Rel_D(services, fileStorage, "both services stores via this call", $tags="service1&service2+service1+service2")

SHOW_LEGEND(false)
@enduml