apply axis rotations to trace lines in op area

src/geo/polygon.js

@@ -794,11 +794,12 @@ export class Polygon {
         return [this.first().key, this.last().key, this.length].join('~~');
     }
 
-    applyRotations() {
+    applyRotations(deg) {
         for (let point of this.points) {
-            if (point.a) {
+            let angleDeg = deg ?? point.a;
+            if (angleDeg) {
                 let p2 = new Vector3(point.x, point.y, point.z)
-                    .applyAxisAngle(XAXIS, point.a * DEG2RAD);
+                    .applyAxisAngle(XAXIS, angleDeg * DEG2RAD);
                 point.x = p2.x;
                 point.y = p2.y;
                 point.z = p2.z;

src/kiri/mode/cam/op-area.js

@@ -29,7 +29,7 @@ class OpArea extends CamOp {
         let { op, state } = this;
         let { direction, down, expand, flats, flatOff, follow } = op;
         let { mode, outline, over, rename, smooth, tool } = op;
-        let { addSlices, color, cutTabs, settings } = state;
+        let { addSlices, axisIndex, color, cutTabs, settings } = state;
         let { shadowAt, setToolDiam, tabs, widget, workarea } = state;
 
         let areaTool = new Tool(settings, tool);
@@ -75,6 +75,10 @@ class OpArea extends CamOp {
             let poly = newPolygon().fromArray(arr);
             aminz = Math.min(aminz, poly.minZ());
             polys.push(poly);
+            if (axisIndex) {
+                // traces come from unrotatead widget edges
+                poly.applyRotations(axisIndex);
+            }
         }
 
         // connect open poly edge segments into closed loops (when possible)

src/kiri/mode/cam/slice.js

@@ -180,6 +180,8 @@ export async function cam_slice(settings, widget, onupdate, ondone) {
     let slicer;
     let state = {
         addSlices,
+        axisIndex,
+        axisRotation,
         bounds,
         color,
         computeShadows,
@@ -261,8 +263,8 @@ export async function cam_slice(settings, widget, onupdate, ondone) {
     }
 
     async function setAxisIndex(degrees = 0, absolute = true) {
-        axisIndex = absolute ? degrees : (axisIndex || 0) + degrees;
-        axisRotation = (Math.PI / 180) * axisIndex;
+        state.axisIndex = axisIndex = absolute ? degrees : (axisIndex || 0) + degrees;
+        state.axisRotation = axisRotation = (Math.PI / 180) * axisIndex;
         widget.setAxisIndex(isIndexed ? -axisIndex : 0);
         state.tabs = tabs = [];
         for (let tab of tabW) {