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A click with the Reshape tool on an anchor of a selected path makes it
the focal point, and a click on a segment adds an anchor there that
becomes the focal point. Shift-click adds an anchor or a point on a
segment to the focal points, or removes an anchor that is one already.
Each focal point shows a filled anchor square in a larger hollow one.
A drag from a focal point moves all of them; a drag from another point
moves that point alone, and Shift only keeps the drag's angle.
path.reshape takes the other focal points as focal: [[subpath,
anchor]...]. Anchors that are not direct-selected stay in place, and so
do the ends of an open path unless they are focal points. A selected
anchor between two focal points moves by the whole drag, and one
between a focal point and an anchor that stays takes u² (3 - 2u) of
the drag, as before. A closed subpath with every anchor selected moves
whole: a Reshape drag on a fully selected closed path, and path.reshape
without radius on a closed path selected whole or not selected, move
the whole path instead of a local area. With radius, only the grabbed
point's subpath changes, with the falloff as before.
- An anchor added on a segment of a partly selected path is selected,
and the selected anchors and segments after it keep their points.
- A focal pair that names no anchor is refused ("`focal` names [0, 7],
which is not an anchor of the path"), and so is focal with radius.
Docs: docs/mcp.md, docs/target-app-parity.md.