[Chen ERD] Allow horizontal layout or left to right direction

[The-Lum]

Context

To follow:

• Implement Chen Notation for ER-diagrams #1718
• Chen Notation for ER-diagrams #945

Wanted feature

• How to reproduce this first (wikipedia) example?

ERD Wikipedia example

Source: Entity–relationship model

• Could you allow left to right direction on Chen ER-diagrams?

Example

@startchen

entity Person {
}
entity Location {
}
relationship Birthplace {
}

Person -N- Birthplace
Birthplace -1- Location

@endchen

@startchen
left to right direction

entity Person {
}
entity Location {
}
relationship Birthplace {
}

Person -N- Birthplace
Birthplace -1- Location

@endchen

Regards,
Th.

[FYI @Benjamin-Davies]