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feat(snap): Shift hard axis lock during point picks (#312)

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Holding Shift while a command asks for a point captures the nearest
polar increment (or ortho axis, UCS-aware) from the rubber-band base
toward the cursor and pins the pick to that ray. Every candidate —
osnap hits included — projects onto the locked direction, so a snap far
off-axis contributes only its along-axis component; the click commits
exactly what the preview shows. The direction stays fixed while Shift
is held and drops the moment it releases. Grip drags get the same lock
from the grip origin.

Guards: engages only when the active command wants a point — never
during entity picks (Shift there is the TRIM/EXTEND swap), tangent
picks, selection gathering or window-corner picks.

Closes #312

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Hakan Seven 2026-07-22 16:34:47 +03:00
commit 51f07f1208
4 changed files with 119 additions and 4 deletions
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5
src/app/update/mod.rs
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@ -2243,6 +2243,11 @@ impl OpenCADStudio {
let ctrl_changed = self.ctrl_down != ctrl;
self.shift_down = shift;
self.ctrl_down = ctrl;
// Releasing Shift drops the hard axis lock immediately (#312)
// — without this a lock could linger until the next move.
if !shift {
self.axis_lock_dir = None;
}
// A live command may key its preview off Ctrl (arc-direction
// flip). Rebuild it at the current cursor so the flip shows
// without waiting for the next mouse move.