Transformable patterns (#2824)

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

@@ -0,0 +1,26 @@
+// Parameters
+const r = 50    // base radius
+const h = 10    // layer height
+const t = 0.005 // taper factor [0-1)
+// Defines how to modify each layer of the vase.
+// Each replica is shifted up the Z axis, and has a smoothly-varying radius
+fn transform = (replicaId) => {
+  let scale = r * abs(1 - (t * replicaId)) * (5 + cos(replicaId / 8))
+  return {
+    translate: [0, 0, replicaId * 10],
+    scale: [scale, scale, 0],
+  }
+}
+// Each layer is just a pretty thin cylinder with a fillet.
+fn layer = () => {
+  return startSketchOn("XY") // or some other plane idk
+    |> circle([0, 0], 1, %, 'tag1')
+    |> extrude(h, %)
+    // |> fillet({
+    //        radius: h / 2.01,
+    //        tags: ["tag1", getOppositeEdge("tag1", %)]
+    //    }, %)
+}
+// The vase is 100 layers tall.
+// The 100 layers are replica of each other, with a slight transformation applied to each.
+let vase = layer() |> patternTransform(100, transform, %)

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

@@ -2464,3 +2464,10 @@ async fn serial_test_global_tags() {
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
     twenty_twenty::assert_image("tests/executor/outputs/global_tags.png", &result, 0.999);
 }
+
+#[tokio::test(flavor = "multi_thread")]
+async fn serial_test_pattern_vase() {
+    let code = include_str!("inputs/pattern_vase.kcl");
+    let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
+    twenty_twenty::assert_image("tests/executor/outputs/pattern_vase.png", &result, 0.999);
+}