✨ Added tutorial pattern

packages/tutorial/src/step9.js

@@ -0,0 +1,58 @@
+export default function(part) {
+  let {
+    Point,
+    points,
+    Path,
+    paths,
+    measurements,
+    options,
+    macro
+  } = part.shorthand();
+
+  points.edgeTopRightCp = points.edgeTopLeftCp.flipX();
+  points.topCp1 = points.topCp2.flipX();
+  points.tipLeftTopStart = points.tipRightTopStart.flipX();
+  points.tipLeftTopCp1 = points.tipRightTopCp1.flipX();
+  points.tipLeftTopCp2 = points.tipRightTopCp2.flipX();
+  points.tipLeftTopEnd = points.tipRightTopEnd.flipX();
+  points.tipLeftBottomStart = points.tipRightBottomStart.flipX();
+  points.tipLeftBottomCp1 = points.tipRightBottomCp1.flipX();
+  points.tipLeftBottomCp2 = points.tipRightBottomCp2.flipX();
+  points.tipLeftBottomEnd = points.tipRightBottomEnd.flipX();
+  points.snapRight = points.snapLeft.flipX();
+
+  paths.seam = new Path()
+    .move(points.edgeLeft)
+    .line(points.bottomLeft)
+    .line(points.bottomRight)
+    .line(points.edgeRight)
+    .curve(points.edgeRightCp, points.edgeTopRightCp, points.tipLeftTopStart)
+    .curve(points.tipLeftTopCp1, points.tipLeftTopCp2, points.tipLeftTopEnd)
+    .curve(
+      points.tipLeftBottomCp1,
+      points.tipLeftBottomCp2,
+      points.tipLeftBottomEnd
+    )
+    .curve(points.topCp1, points.rightCp2, points.right)
+    .curve(points.rightCp1, points.bottomCp2, points.bottom)
+    .curve(points.bottomCp1, points.leftCp2, points.left)
+    .curve(points.leftCp1, points.topCp2, points.tipRightBottomEnd)
+    .curve(
+      points.tipRightBottomCp2,
+      points.tipRightBottomCp1,
+      points.tipRightBottomStart
+    )
+    .curve(
+      points.tipRightTopCp2,
+      points.tipRightTopCp1,
+      points.tipRightTopStart
+    )
+    .curve(points.edgeTopLeftCp, points.edgeLeftCp, points.edgeLeft)
+    .close()
+    .attr("class", "fabric");
+
+  delete paths.neck;
+  delete paths.rect;
+
+  return part;
+}