constraints.ParallelEdgesConstraint

constraints.ParallelEdgesConstraint(a1, a2, b1, b2, *, weight=1.0)

Constraint that forces two sketch edges to be parallel.

Edges are given by their endpoint parameters. Unlike :class:~cadjoint.constraints.types.parallel.ParallelConstraint, which operates on 3D direction vectors, this constrains the differences of 2D sketch points via the 2D cross product: cross(a2 - a1, b2 - b1) = 0

Reduces DOF by 1 (one scalar equation).

Parameters

Name	Type	Description	Default
a1	Vector2	First endpoint of edge A (Vector2 parameter)	required
a2	Vector2	Second endpoint of edge A (Vector2 parameter)	required
b1	Vector2	First endpoint of edge B (Vector2 parameter)	required
b2	Vector2	Second endpoint of edge B (Vector2 parameter)	required

Example

a1 = Vector2([0, 0], free=True, name='a1')
a2 = Vector2([1, 0], free=True, name='a2')
b1 = Vector2([0, 1], free=True, name='b1')
b2 = Vector2([1, 2], free=True, name='b2')
constraint = ParallelEdgesConstraint(a1, a2, b1, b2)

Methods

Name	Description
compute_residual	Compute parallel-edges residual: cross(a2 - a1, b2 - b1).
dof_reduction	Parallel-edges constraint adds 1 scalar equation (2D cross product).
get_parameters	Return all four endpoints involved in the constraint.

compute_residual

constraints.ParallelEdgesConstraint.compute_residual(param_values)

Compute parallel-edges residual: cross(a2 - a1, b2 - b1).

Parameters

Name	Type	Description	Default
param_values	dict[str, Array]	Dict with keys matching parameter names	required

Returns

Name	Type	Description
	Array	Scalar residual (0 when the edges are parallel)

dof_reduction

constraints.ParallelEdgesConstraint.dof_reduction()

Parallel-edges constraint adds 1 scalar equation (2D cross product).

get_parameters

constraints.ParallelEdgesConstraint.get_parameters()

Return all four endpoints involved in the constraint.