KCL: Better docs for patternTransform and int (#4002)

docs/kcl/std.json

@@ -137746,7 +137746,7 @@
     "unpublished": false,
     "deprecated": false,
     "examples": [
-      "const sketch001 = startSketchOn('XZ')\n  |> circle({ center: [0, 0], radius: 2 }, %)\nconst extrude001 = extrude(5, sketch001)\n\nlet n = int(ceil(5 / 2))\nassertEqual(n, 3, 0.0001, \"5/2 = 2.5, rounded up makes 3\")\nconst pattern01 = patternTransform(n, (id) => {\n  return { translate: [4 * id, 0, 0] }\n}, extrude001)"
+      "let n = int(ceil(5 / 2))\nassertEqual(n, 3, 0.0001, \"5/2 = 2.5, rounded up makes 3\")\n// Draw n cylinders.\nstartSketchOn('XZ')\n  |> circle({ center: [0, 0], radius: 2 }, %)\n  |> extrude(5, %)\n  |> patternTransform(n, (id) => {\n    return { translate: [4 * id, 0, 0] }\n}, %)"
     ]
   },
   {
@@ -203739,12 +203739,12 @@
   },
   {
     "name": "patternTransform",
-    "summary": "Repeat a 3-dimensional solid by successively applying a transformation (such",
-    "description": "as rotation, scale, translation, visibility) on each repetition.\nThe transformation takes a single parameter: an integer representing which number replication the transform is for. E.g. the first replica to be transformed will be passed the argument `1`.",
+    "summary": "Repeat a 3-dimensional solid, changing it each time.",
+    "description": "Replicates the 3D solid, applying a transformation function to each replica. Transformation function could alter rotation, scale, visibility, position, etc.\nThe `patternTransform` call itself takes a number for how many total instances of the shape should be. For example, if you use a circle with `patternTransform(4, transform)` then there will be 4 circles: the original, and 3 created by replicating the original and calling the transform function on each.\nThe transform function takes a single parameter: an integer representing which number replication the transform is for. E.g. the first replica to be transformed will be passed the argument `1`. This simplifies your math: the transform function can rely on id `0` being the original instance passed into the `patternTransform`. See the examples.",
     "tags": [],
     "args": [
       {
-        "name": "num_repetitions",
+        "name": "total_instances",
         "type": "u32",
         "schema": {
           "type": "integer",
@@ -210861,6 +210861,8 @@
     "unpublished": false,
     "deprecated": false,
     "examples": [
+      "// Each instance will be shifted along the X axis.\nfn transform = (id) => {\n  return { translate: [4 * id, 0, 0] }\n}\n\n// Sketch 4 cylinders.\nconst sketch001 = startSketchOn('XZ')\n  |> circle({ center: [0, 0], radius: 2 }, %)\n  |> extrude(5, %)\n  |> patternTransform(4, transform, %)",
+      "// Each instance will be shifted along the X axis,\n// with a gap between the original (at x = 0) and the first replica\n// (at x = 8). This is because `id` starts at 1.\nfn transform = (id) => {\n  return { translate: [4 * (1 + id), 0, 0] }\n}\n\nconst sketch001 = startSketchOn('XZ')\n  |> circle({ center: [0, 0], radius: 2 }, %)\n  |> extrude(5, %)\n  |> patternTransform(4, transform, %)",
       "fn cube = (length, center) => {\n  let l = length / 2\n  let x = center[0]\n  let y = center[1]\n  let p0 = [-l + x, -l + y]\n  let p1 = [-l + x, l + y]\n  let p2 = [l + x, l + y]\n  let p3 = [l + x, -l + y]\n\n  return startSketchAt(p0)\n  |> lineTo(p1, %)\n  |> lineTo(p2, %)\n  |> lineTo(p3, %)\n  |> lineTo(p0, %)\n  |> close(%)\n  |> extrude(length, %)\n}\n\nlet width = 20\nfn transform = (i) => {\n  return {\n  // Move down each time.\n  translate: [0, 0, -i * width],\n  // Make the cube longer, wider and flatter each time.\n  scale: [pow(1.1, i), pow(1.1, i), pow(0.9, i)],\n  // Turn by 15 degrees each time.\n  rotation: { angle: 15 * i, origin: \"local\" }\n}\n}\n\nlet myCubes = cube(width, [100, 0])\n  |> patternTransform(25, transform, %)",
       "// Parameters\nconst r = 50 // base radius\nconst h = 10 // layer height\nconst t = 0.005 // taper factor [0-1)\n// Defines how to modify each layer of the vase.\n// Each replica is shifted up the Z axis, and has a smoothly-varying radius\nfn transform = (replicaId) => {\n  let scale = r * abs(1 - (t * replicaId)) * (5 + cos(replicaId / 8))\n  return {\n  translate: [0, 0, replicaId * 10],\n  scale: [scale, scale, 0]\n}\n}\n// Each layer is just a pretty thin cylinder.\nfn layer = () => {\n  return startSketchOn(\"XY\")\n  // or some other plane idk\n  |> circle({ center: [0, 0], radius: 1 }, %, $tag1)\n  |> extrude(h, %)\n}\n// The vase is 100 layers tall.\n// The 100 layers are replica of each other, with a slight transformation applied to each.\nlet vase = layer()\n  |> patternTransform(100, transform, %)"
     ]

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

@@ -49,15 +49,15 @@ pub async fn int(_exec_state: &mut ExecState, args: Args) -> Result<KclValue, Kc
 /// a runtime error.
 ///
 /// ```no_run
-/// const sketch001 = startSketchOn('XZ')
-///   |> circle({ center: [0, 0], radius: 2 }, %)
-/// const extrude001 = extrude(5, sketch001)
-///
 /// let n = int(ceil(5/2))
 /// assertEqual(n, 3, 0.0001, "5/2 = 2.5, rounded up makes 3")
-/// const pattern01 = patternTransform(n, (id) => {
+/// // Draw n cylinders.
+/// startSketchOn('XZ')
+///   |> circle({ center: [0, 0], radius: 2 }, %)
+///   |> extrude(5, %)
+///   |> patternTransform(n, (id) => {
 ///   return { translate: [4 * id, 0, 0] }
-/// }, extrude001)
+/// }, %)
 /// ```
 #[stdlib {
     name = "int",

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

@@ -105,12 +105,45 @@ pub async fn pattern_transform(exec_state: &mut ExecState, args: Args) -> Result
     Ok(KclValue::ExtrudeGroups { value: extrude_groups })
 }
 
-/// Repeat a 3-dimensional solid by successively applying a transformation (such
-/// as rotation, scale, translation, visibility) on each repetition.
+/// Repeat a 3-dimensional solid, changing it each time.
 ///
-/// The transformation takes a single parameter: an integer representing which
+/// Replicates the 3D solid, applying a transformation function to each replica.
+/// Transformation function could alter rotation, scale, visibility, position, etc.
+///
+/// The `patternTransform` call itself takes a number for how many total instances of
+/// the shape should be. For example, if you use a circle with `patternTransform(4, transform)`
+/// then there will be 4 circles: the original, and 3 created by replicating the original and
+/// calling the transform function on each.
+///
+/// The transform function takes a single parameter: an integer representing which
 /// number replication the transform is for. E.g. the first replica to be transformed
-/// will be passed the argument `1`.
+/// will be passed the argument `1`. This simplifies your math: the transform function can
+/// rely on id `0` being the original instance passed into the `patternTransform`. See the examples.
+/// ```no_run
+/// // Each instance will be shifted along the X axis.
+/// fn transform = (id) => {
+///   return { translate: [4 * id, 0, 0] }
+/// }
+///
+/// // Sketch 4 cylinders.
+/// const sketch001 = startSketchOn('XZ')
+///   |> circle({ center: [0, 0], radius: 2 }, %)
+///   |> extrude(5, %)
+///   |> patternTransform(4, transform, %)
+/// ```
+/// ```no_run
+/// // Each instance will be shifted along the X axis,
+/// // with a gap between the original (at x = 0) and the first replica
+/// // (at x = 8). This is because `id` starts at 1.
+/// fn transform = (id) => {
+///   return { translate: [4 * (1+id), 0, 0] }
+/// }
+///
+/// const sketch001 = startSketchOn('XZ')
+///   |> circle({ center: [0, 0], radius: 2 }, %)
+///   |> extrude(5, %)
+///   |> patternTransform(4, transform, %)
+/// ```
 /// ```no_run
 /// fn cube = (length, center) => {
 ///   let l = length/2
@@ -178,15 +211,15 @@ pub async fn pattern_transform(exec_state: &mut ExecState, args: Args) -> Result
      name = "patternTransform",
  }]
 async fn inner_pattern_transform<'a>(
-    num_repetitions: u32,
+    total_instances: u32,
     transform_function: FunctionParam<'a>,
     extrude_group_set: ExtrudeGroupSet,
     exec_state: &mut ExecState,
     args: &'a Args,
 ) -> Result<Vec<Box<ExtrudeGroup>>, KclError> {
     // Build the vec of transforms, one for each repetition.
-    let mut transform = Vec::with_capacity(usize::try_from(num_repetitions).unwrap());
-    for i in 1..num_repetitions {
+    let mut transform = Vec::with_capacity(usize::try_from(total_instances).unwrap());
+    for i in 1..total_instances {
         let t = make_transform(i, &transform_function, args.source_range, exec_state).await?;
         transform.push(t);
     }