Fix tanArcTo (#3318)

* updated tangentArc math

* Add a test case showing tan arc then xLineTo

* Fix compile errors

* Tweaking the math

* Use + on angles

* atan2 outputs radians, not degrees

* Track ccw and center of all tan arcs

* re-sequenced atan2 arcTan

* Remove print statements

* Update the test

* Update kittycad in tauri

* New arc fields

---------

Co-authored-by: Jordan Noone <jordan@kittycad.io>

docs/kcl/angleToMatchLengthX.md

@@ -253,6 +253,10 @@ const extrusion = extrude(5, sketch001)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -458,6 +462,10 @@ const extrusion = extrude(5, sketch001)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.

docs/kcl/angleToMatchLengthY.md

@@ -257,6 +257,10 @@ const extrusion = extrude(5, sketch001)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -462,6 +466,10 @@ const extrusion = extrude(5, sketch001)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.

docs/kcl/angledLine.md

@@ -172,6 +172,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -377,6 +381,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -584,6 +592,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -789,6 +801,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.

docs/kcl/angledLineOfXLength.md

@@ -171,6 +171,10 @@ const extrusion = extrude(10, sketch001)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -376,6 +380,10 @@ const extrusion = extrude(10, sketch001)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -583,6 +591,10 @@ const extrusion = extrude(10, sketch001)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -788,6 +800,10 @@ const extrusion = extrude(10, sketch001)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.

docs/kcl/angledLineOfYLength.md

@@ -173,6 +173,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -378,6 +382,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -585,6 +593,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -790,6 +802,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.

docs/kcl/angledLineThatIntersects.md

@@ -265,6 +265,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -470,6 +474,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -677,6 +685,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -882,6 +894,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.

docs/kcl/angledLineToX.md

@@ -170,6 +170,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -375,6 +379,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -582,6 +590,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -787,6 +799,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.

docs/kcl/angledLineToY.md

@@ -170,6 +170,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -375,6 +379,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -582,6 +590,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -787,6 +799,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.

docs/kcl/arc.md

@@ -183,6 +183,10 @@ const exampleSketch = startSketchOn('XZ')
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -388,6 +392,10 @@ const exampleSketch = startSketchOn('XZ')
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -595,6 +603,10 @@ const exampleSketch = startSketchOn('XZ')
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -800,6 +812,10 @@ const exampleSketch = startSketchOn('XZ')
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.

docs/kcl/bezierCurve.md

@@ -176,6 +176,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -381,6 +385,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -588,6 +596,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -793,6 +805,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.

docs/kcl/chamfer.md

@@ -398,6 +398,10 @@ const mountingPlate = extrude(thickness, mountingPlateSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -798,6 +802,10 @@ const mountingPlate = extrude(thickness, mountingPlateSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.

docs/kcl/circle.md

@@ -169,6 +169,10 @@ const example = extrude(5, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -541,6 +545,10 @@ const example = extrude(5, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -748,6 +756,10 @@ const example = extrude(5, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -953,6 +965,10 @@ const example = extrude(5, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.

docs/kcl/close.md

@@ -171,6 +171,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -376,6 +380,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -583,6 +591,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -788,6 +800,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.

docs/kcl/extrude.md

@@ -196,6 +196,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -402,6 +406,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -728,6 +736,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.

docs/kcl/fillet.md

@@ -398,6 +398,10 @@ const mountingPlate = extrude(thickness, mountingPlateSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -798,6 +802,10 @@ const mountingPlate = extrude(thickness, mountingPlateSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.

docs/kcl/helix.md

@@ -299,6 +299,10 @@ const part001 = startSketchOn('XY')
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -690,6 +694,10 @@ const part001 = startSketchOn('XY')
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.

docs/kcl/hole.md

@@ -182,6 +182,10 @@ const example = extrude(1, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -388,6 +392,10 @@ const example = extrude(1, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -586,6 +594,10 @@ const example = extrude(1, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -791,6 +803,10 @@ const example = extrude(1, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -989,6 +1005,10 @@ const example = extrude(1, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -1194,6 +1214,10 @@ const example = extrude(1, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.

docs/kcl/lastSegX.md

@@ -162,6 +162,10 @@ const example = extrude(5, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -367,6 +371,10 @@ const example = extrude(5, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.

docs/kcl/lastSegY.md

@@ -162,6 +162,10 @@ const example = extrude(5, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -367,6 +371,10 @@ const example = extrude(5, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.

docs/kcl/line.md

@@ -175,6 +175,10 @@ const example = extrude(5, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -380,6 +384,10 @@ const example = extrude(5, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -587,6 +595,10 @@ const example = extrude(5, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -792,6 +804,10 @@ const example = extrude(5, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.

docs/kcl/lineTo.md

@@ -162,6 +162,10 @@ const example = extrude(5, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -367,6 +371,10 @@ const example = extrude(5, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -574,6 +582,10 @@ const example = extrude(5, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -779,6 +791,10 @@ const example = extrude(5, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.

docs/kcl/patternCircular2d.md

@@ -180,6 +180,10 @@ const example = extrude(1, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -386,6 +390,10 @@ const example = extrude(1, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.

docs/kcl/patternCircular3d.md

@@ -304,6 +304,10 @@ const example = extrude(-5, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.

docs/kcl/patternLinear2d.md

@@ -173,6 +173,10 @@ const example = extrude(1, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -379,6 +383,10 @@ const example = extrude(1, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.

docs/kcl/patternLinear3d.md

@@ -302,6 +302,10 @@ const example = extrude(1, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.

docs/kcl/patternTransform.md

@@ -304,6 +304,10 @@ let vase = layer()
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.

docs/kcl/profileStart.md

@@ -163,6 +163,10 @@ const sketch001 = startSketchOn('XY')
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -368,6 +372,10 @@ const sketch001 = startSketchOn('XY')
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.

docs/kcl/profileStartX.md

@@ -158,6 +158,10 @@ const sketch001 = startSketchOn('XY')
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -363,6 +367,10 @@ const sketch001 = startSketchOn('XY')
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.

docs/kcl/profileStartY.md

@@ -157,6 +157,10 @@ const sketch001 = startSketchOn('XY')
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -362,6 +366,10 @@ const sketch001 = startSketchOn('XY')
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.

docs/kcl/revolve.md

@@ -379,6 +379,10 @@ uuid |
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -584,6 +588,10 @@ uuid |
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -907,6 +915,10 @@ uuid |
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.

docs/kcl/shell.md

@@ -386,6 +386,10 @@ shell({ faces: ['end'], thickness: 0.25 }, firstSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -777,6 +781,10 @@ shell({ faces: ['end'], thickness: 0.25 }, firstSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.

docs/kcl/startProfileAt.md

@@ -241,6 +241,10 @@ const example = extrude(5, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -540,6 +544,10 @@ const example = extrude(5, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -745,6 +753,10 @@ const example = extrude(5, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.

docs/kcl/startSketchAt.md

@@ -188,6 +188,10 @@ const example = extrude(5, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -393,6 +397,10 @@ const example = extrude(5, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.

docs/kcl/startSketchOn.md

@@ -310,6 +310,10 @@ const a1 = startSketchOn({
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -722,6 +726,10 @@ const a1 = startSketchOn({
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.

docs/kcl/tangentialArc.md

@@ -172,6 +172,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -377,6 +381,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -584,6 +592,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -789,6 +801,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.

docs/kcl/tangentialArcTo.md

@@ -162,6 +162,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -367,6 +371,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -574,6 +582,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -779,6 +791,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.

docs/kcl/xLine.md

@@ -165,6 +165,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -370,6 +374,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -577,6 +585,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -782,6 +794,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.

docs/kcl/xLineTo.md

@@ -165,6 +165,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -370,6 +374,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -577,6 +585,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -782,6 +794,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.

docs/kcl/yLine.md

@@ -163,6 +163,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -368,6 +372,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -575,6 +583,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -780,6 +792,10 @@ const example = extrude(10, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.

docs/kcl/yLineTo.md

@@ -161,6 +161,10 @@ const example = extrude(5, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -366,6 +370,10 @@ const example = extrude(5, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -573,6 +581,10 @@ const example = extrude(5, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.
@@ -778,6 +790,10 @@ const example = extrude(5, exampleSketch)
 	type: "TangentialArcTo",
 } |
 {
+	// arc's direction
+	ccw: string,
+	// the arc's center
+	center: [number, number],
 	// The from point.
 	from: [number, number],
 	// The tag of the path.

src-tauri/Cargo.lock

@@ -2672,9 +2672,9 @@ dependencies = [
 
 [[package]]
 name = "kittycad"
-version = "0.3.9"
+version = "0.3.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "36b87a9cca545825ba18005c1944b8525fac28867d99984178bf22c79fb5ec25"
+checksum = "3d798c82f6e62d786fca0a7ec073675bbe9550c885efb99390d2701ca557ec69"
 dependencies = [
  "anyhow",
  "async-trait",

src/wasm-lib/Cargo.lock

@@ -1480,9 +1480,9 @@ dependencies = [
 
 [[package]]
 name = "kittycad"
-version = "0.3.9"
+version = "0.3.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "36b87a9cca545825ba18005c1944b8525fac28867d99984178bf22c79fb5ec25"
+checksum = "3d798c82f6e62d786fca0a7ec073675bbe9550c885efb99390d2701ca557ec69"
 dependencies = [
  "anyhow",
  "async-trait",
@@ -1858,7 +1858,7 @@ dependencies = [
  "bincode",
  "either",
  "fnv",
- "itertools 0.12.1",
+ "itertools 0.10.5",
  "lazy_static",
  "nom",
  "quick-xml",

src/wasm-lib/kcl/src/executor.rs

@@ -1017,6 +1017,11 @@ impl SketchGroup {
             };
         };
         match path {
+            Path::TangentialArc { center, ccw, .. } => GetTangentialInfoFromPathsResult {
+                center_or_tangent_point: *center,
+                is_center: true,
+                ccw: *ccw,
+            },
             Path::TangentialArcTo { center, ccw, .. } => GetTangentialInfoFromPathsResult {
                 center_or_tangent_point: *center,
                 is_center: true,
@@ -1346,6 +1351,11 @@ pub enum Path {
     TangentialArc {
         #[serde(flatten)]
         base: BasePath,
+        /// the arc's center
+        #[ts(type = "[number, number]")]
+        center: [f64; 2],
+        /// arc's direction
+        ccw: bool,
     },
     /// A path that is horizontal.
     Horizontal {
@@ -1378,7 +1388,7 @@ impl Path {
             Path::AngledLineTo { base, .. } => base.geo_meta.id,
             Path::Base { base } => base.geo_meta.id,
             Path::TangentialArcTo { base, .. } => base.geo_meta.id,
-            Path::TangentialArc { base } => base.geo_meta.id,
+            Path::TangentialArc { base, .. } => base.geo_meta.id,
         }
     }
 
@@ -1389,7 +1399,7 @@ impl Path {
             Path::AngledLineTo { base, .. } => base.tag.clone(),
             Path::Base { base } => base.tag.clone(),
             Path::TangentialArcTo { base, .. } => base.tag.clone(),
-            Path::TangentialArc { base } => base.tag.clone(),
+            Path::TangentialArc { base, .. } => base.tag.clone(),
         }
     }
 
@@ -1400,7 +1410,7 @@ impl Path {
             Path::AngledLineTo { base, .. } => base,
             Path::Base { base } => base,
             Path::TangentialArcTo { base, .. } => base,
-            Path::TangentialArc { base } => base,
+            Path::TangentialArc { base, .. } => base,
         }
     }
 
@@ -1411,7 +1421,7 @@ impl Path {
             Path::AngledLineTo { base, .. } => Some(base),
             Path::Base { base } => Some(base),
             Path::TangentialArcTo { base, .. } => Some(base),
-            Path::TangentialArc { base } => Some(base),
+            Path::TangentialArc { base, .. } => Some(base),
         }
     }
 }

src/wasm-lib/kcl/src/std/sketch.rs

@@ -1681,42 +1681,65 @@ async fn inner_tangential_arc(
     args: Args,
 ) -> Result<Box<SketchGroup>, KclError> {
     let from: Point2d = sketch_group.current_pen_position()?;
+    // next set of lines is some undocumented voodoo from get_tangential_arc_to_info
+    let tangent_info = sketch_group.get_tangential_info_from_paths(); //this function desperately needs some documentation
+    let tan_previous_point = if tangent_info.is_center {
+        get_tangent_point_from_previous_arc(tangent_info.center_or_tangent_point, tangent_info.ccw, from.into())
+    } else {
+        tangent_info.center_or_tangent_point
+    };
 
     let id = uuid::Uuid::new_v4();
 
-    let to = match &data {
+    let (center, to, ccw) = match data {
         TangentialArcData::RadiusAndOffset { radius, offset } => {
+            // KCL stdlib types use degrees.
+            let offset = Angle::from_degrees(offset);
+
             // Calculate the end point from the angle and radius.
-            let end_angle = Angle::from_degrees(*offset);
+            // atan2 outputs radians.
-            let start_angle = Angle::from_degrees(0.0);
+            let previous_end_tangent = Angle::from_radians(f64::atan2(
-            let (_, to) = arc_center_and_end(from, start_angle, end_angle, *radius);
+                from.y - tan_previous_point[1],
+                from.x - tan_previous_point[0],
+            ));
+            // make sure the arc center is on the correct side to guarantee deterministic behavior
+            // note the engine automatically rejects an offset of zero, if we want to flag that at KCL too to avoid engine errors
+            let ccw = offset.degrees() > 0.0;
+            let tangent_to_arc_start_angle = if ccw {
+                // CCW turn
+                Angle::from_degrees(-90.0)
+            } else {
+                // CW turn
+                Angle::from_degrees(90.0)
+            };
+            // may need some logic and / or modulo on the various angle values to prevent them from going "backwards"
+            // but the above logic *should* capture that behavior
+            let start_angle = previous_end_tangent + tangent_to_arc_start_angle;
+            let end_angle = start_angle + offset;
+            let (center, to) = arc_center_and_end(from, start_angle, end_angle, radius);
 
             args.batch_modeling_cmd(
                 id,
                 ModelingCmd::ExtendPath {
                     path: sketch_group.id,
-                    segment: kittycad::types::PathSegment::TangentialArc {
+                    segment: kittycad::types::PathSegment::TangentialArc { radius, offset },
-                        radius: *radius,
-                        offset: Angle {
-                            unit: kittycad::types::UnitAngle::Degrees,
-                            value: *offset,
-                        },
-                    },
                 },
             )
             .await?;
-            to.into()
+            (center, to.into(), ccw)
         }
         TangentialArcData::Point(to) => {
-            args.batch_modeling_cmd(id, tan_arc_to(&sketch_group, to)).await?;
+            args.batch_modeling_cmd(id, tan_arc_to(&sketch_group, &to)).await?;
-
+            // TODO: Figure out these calculations.
-            *to
+            let ccw = false;
+            let center = Point2d { x: 0.0, y: 0.0 };
+            (center, to, ccw)
         }
     };
 
-    let to = [from.x + to[0], from.y + to[1]];
-
     let current_path = Path::TangentialArc {
+        ccw,
+        center: center.into(),
         base: BasePath {
             from: from.into(),
             to,

src/wasm-lib/kcl/src/std/utils.rs

@@ -833,6 +833,7 @@ pub fn get_tangent_point_from_previous_arc(
 ) -> Coords2d {
     let angle_from_old_center_to_arc_start = get_angle(last_arc_center, last_arc_end);
     let tangential_angle = angle_from_old_center_to_arc_start + if last_arc_ccw { -90.0 } else { 90.0 };
+    // What is the 10.0 constant doing???
     [
         tangential_angle.to_radians().cos() * 10.0 + last_arc_end[0],
         tangential_angle.to_radians().sin() * 10.0 + last_arc_end[1],

src/wasm-lib/tests/executor/inputs/tan_arc_x_line.kcl

@@ -0,0 +1,25 @@
+let startX = 0
+let startY = 0
+let angleOffset = 135
+let r = 1
+let angleStart = 110
+
+startSketchOn('XY')
+  |> startProfileAt([startX, startY], %)
+  |> angledLine({
+    angle: angleStart,
+    length: .000001,
+  }, %)
+  |> tangentialArc({
+       offset: angleOffset,
+       radius: r,
+     }, %, $arc1)
+  |> tangentialArc({
+  offset: angleOffset,
+  radius: 0.5*r,
+     }, %, $arc2)
+  |> tangentialArc({
+  offset: -angleOffset,
+  radius: 0.5*r,
+}, %, $arc3)
+  |> xLineTo(1, %)

src/wasm-lib/tests/executor/main.rs

@@ -31,6 +31,13 @@ async fn kcl_test_riddle_small() {
     assert_out("riddle_small", &result);
 }
 
+#[tokio::test(flavor = "multi_thread")]
+async fn kcl_test_tan_arc_x_line() {
+    let code = kcl_input!("tan_arc_x_line");
+    let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
+    assert_out("tan_arc_x_line", &result);
+}
+
 #[tokio::test(flavor = "multi_thread")]
 async fn kcl_test_lego() {
     let code = kcl_input!("lego");