Reading the diagram

Weftmap draws two diagram types: a call graph for programming languages and an entity-relationship diagram for SQL. This page explains how to read the nodes, edges and controls.

Nodes

• Module — each file, drawn as a container that groups its functions.
• Function / method — a definition inside a module or class.
• Class — groups its methods (in languages with classes).
• Table — in SQL, an entity with its columns, types and PK/FK keys.

Edges

• calls — one function calls another (animated line).
• imports — one module imports another.
• extends — one class inherits from another.
• references — in SQL, a foreign key points to another table.

Cardinality (SQL)

Foreign-key edges show their cardinality:

• 1:N — one row references many (a normal FK).
• 1:1 — the FK column is unique or is the full primary key.
• N:M — inferred from a junction table (composite PK of two FKs).

Legend and controls

• Legend: top-left; click an edge type to hide or show it.
• Pan & zoom: drag the canvas, scroll to zoom.
• Fit: the bottom controls reset the view.