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docs: explain selector chaining #2042

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20 changes: 20 additions & 0 deletions doc/selectors.rst
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Expand Up @@ -52,6 +52,26 @@ Much more complex expressions are possible as well:
.chamfer(0.1)
)

Selector methods can also be chained. Each selector operates on the current
selection, so chaining is useful when an expression is easier to read as a
sequence of narrowing steps. For example, ``faces(">Y").edges("%CIRCLE")`` first
selects the positive Y face and then selects only the circular edges belonging to
that face:

.. cadquery::

result = (
cq.Workplane("XY")
.box(4, 4, 1)
.faces(">Z")
.workplane()
.rarray(2, 2, 2, 2)
.hole(0.5)
.faces(">Z")
.edges("%CIRCLE")
.chamfer(0.08)
)

.. _filteringfaces:

Filtering Faces
Expand Down