Add 3 point arc (#5722)

* bare minimum

* start of segment util added

* remove redundant handle

* some probably buggy handling of arc handles, can fix later

* probably bug implementation of update args, but data flow through is mostly there can fix bugs after

* fix update for arc

* fix math for center handle

* fix up length indicator

* tweak math

* stub out xState logic for arc

* more progress on adding point and click, implemented more of sketchLineHelper for arc

* small unrelated tweak

* fix up draft arc bugs

* fix arc last click

* fix draft segment animation and add comment

* add draft point snapping for arcs

* add helper stuff to arc

* clone arc point and click as base for arc-three-point

* rust change for arc three point

* can draw three point arc

* make arcTo editable

* can add new three point arc, so long as it continues existing profile

* get overlays working

* make snap to for continuing profile work for three point arcs

* add draft animation

* tangent issue fix

* action rename

* tmp test fix up

* fix silly bug

* fix couple problems causing tests to fail

* A snapshot a day keeps the bugs away! 📷🐛 (OS: namespace-profile-ubuntu-8-cores)

* fix up

* add delet segment test for new segments

* update docs

* draft segments should look right

* add test for dragging new segment handles

* arc tools can be chained now

* make three point arc can start a new profile (not only extend existing paths)

* add test for equiping and unequiping the tool plus drawing with it

* fix console noise

* A snapshot a day keeps the bugs away! 📷🐛 (OS: namespace-profile-ubuntu-8-cores)

* clean up

* update rust/docs

* put toolbar mode check into fixture

* do thing for lee

* use TEST_COLORSs

* fix colors

* don't await file write

* remove commented code

* remove unneeded template strings

* power to **2

* remove magic numbers

* more string templates

* some odd bits of clean up

* arc should be enable in dev

* A snapshot a day keeps the bugs away! 📷🐛 (OS: namespace-profile-ubuntu-8-cores)

* A snapshot a day keeps the bugs away! 📷🐛 (OS: namespace-profile-ubuntu-8-cores)

* A snapshot a day keeps the bugs away! 📷🐛 (OS: namespace-profile-ubuntu-8-cores)

* add new simulation test

* fix test code from kwark migration

* issues Frank found

* fix deleting half complete ark

* fix

* small fix on dele index

* tsc post main merge

* fix up snaping to profile start

* add cross hari for three point arc

* block snapping if it's the only segment

* add tests for canceling arcTo halfway through

---------

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

src/lib/utils.ts

@@ -387,3 +387,22 @@ export function onMouseDragMakeANewNumber(
   if (!newVal) return
   setText(newVal)
 }
+
+export function isClockwise(points: [number, number][]): boolean {
+  // Need at least 3 points to determine orientation
+  if (points.length < 3) {
+    return false
+  }
+
+  // Calculate the sum of (x2 - x1) * (y2 + y1) for all edges
+  // This is the "shoelace formula" for calculating the signed area
+  let sum = 0
+  for (let i = 0; i < points.length; i++) {
+    const current = points[i]
+    const next = points[(i + 1) % points.length]
+    sum += (next[0] - current[0]) * (next[1] + current[1])
+  }
+
+  // If sum is positive, the points are in clockwise order
+  return sum > 0
+}