Dlines
Dlines, short for dynamic lines, are a geometric primitive used in constraint-based drawing and parametric modeling. Unlike ordinary line segments defined by fixed endpoints, a Dline is governed by a set of constraints that determine its position, length, and orientation. When related elements change, the Dline recalculates to satisfy its constraints, allowing for responsive and adaptive diagrams.
A Dline is typically defined by two or more anchor points and a constraint set. Common constraints
In practice, Dlines are used in computer-aided design, technical illustration, graph drawing, and user interface layout
Historically, Dlines emerged from research in constraint-based geometry and constraint solving in the early 2010s, and