Diagram: Class (UML)¶

UML class diagrams express OOP structure: classes with stereotypes, attributes, methods, and six relationship types.

Relationship kinds¶

Kind	Line style	Arrowhead
`inheritance`	solid	open triangle up
`realization`	dashed	open triangle up
`composition`	solid	filled diamond
`aggregation`	solid	open diamond
`association`	solid	open triangle
`dependency`	dashed	open triangle

Minimal example¶

import engrapha_notes as en
import engrapha_diagrams as ed

cd = ed.ClassDiagram(width=420, height=200, caption="Fig 5: Shape Inheritance")

cd.uml_class(
    "Animal", "Animal",
    stereotype="abstract",
    methods=["+speak(): void"],
)
cd.uml_class("Dog", "Dog",
    attributes=["-name: String", "-age: int"],
    methods=["+speak(): void", "+fetch(): void"],
)
cd.relate("Dog", "Animal", kind="inheritance")
cd.relate("Dog", "Animal", kind="realization", label="implements")

en.add(cd.as_flowable())

Multiplicity labels¶

cd.relate(
    "Department", "Employee",
    kind="association",
    from_mult="1", to_mult="0..*",
    label="employs"
)

Layout¶

Only specify x, y when you need manual positioning. Otherwise let auto_layout() decide:

cd.uml_class("A", "A")
cd.uml_class("B", "B")
cd.relate("A", "B", kind="dependency")