convert moves to Js Array + UI

Author: ndbaker1

Cargo.lock

@@ -9,5 +9,6 @@ crate-type = ["cdylib"]
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+js-sys = "0.3.64"
 string-bean = { path = "../string-bean" }
 wasm-bindgen = "0.2.87"

string-bean-wasm/Cargo.toml

@@ -1,7 +1,9 @@
 use wasm_bindgen::{prelude::wasm_bindgen, JsValue};
 
+type ReturnArray = js_sys::Array;
+
 #[wasm_bindgen]
-pub fn plan_as_json(
+pub fn json_plan_circle(
     line_count: u32,
     line_opacity: f32,
     anchor_count: u32,
@@ -12,7 +14,7 @@ pub fn plan_as_json(
     height: usize,
     image_buffer: &[u8],
     start_anchor: usize,
-) -> JsValue {
+) -> ReturnArray {
     let (x_mid, y_mid) = (width / 2, height / 2);
     let radius = radius.min(x_mid.min(y_mid)) as f64;
 
@@ -37,18 +39,48 @@ pub fn plan_as_json(
         image_buffer,
     );
 
-    let moves = planner
+    planner
         .get_moves(start_anchor, line_count as _)
-        .unwrap_or(Vec::new());
+        .unwrap_or(Vec::new())
+        .into_iter()
+        .map(JsValue::from)
+        .collect()
+}
+
+#[wasm_bindgen]
+pub fn json_plan(
+    line_count: u32,
+    line_opacity: f32,
+    anchor_list: &[f64],
+    anchor_gap_count: usize,
+    penalty: f32,
+    width: usize,
+    height: usize,
+    image_buffer: &[u8],
+    start_anchor: usize,
+) -> ReturnArray {
+    let anchors = anchor_list
+        .chunks_exact(2)
+        .map(|chunk| (chunk[0], chunk[1]))
+        .collect::<Vec<_>>();
 
-    JsValue::from_str(&format!(
-        "[{}]",
-        moves
-            .iter()
-            .map(usize::to_string)
-            .collect::<Vec<_>>()
-            .join(","),
-    ))
+    let mut planner = string_bean::ThreadPlanner::new(
+        line_opacity as _,
+        &anchors,
+        anchor_gap_count,
+        penalty as _,
+        grid_raytrace,
+        width,
+        height,
+        image_buffer,
+    );
+
+    planner
+        .get_moves(start_anchor, line_count as _)
+        .unwrap_or(Vec::new())
+        .into_iter()
+        .map(JsValue::from)
+        .collect()
 }
 
 /// https://playtechs.blogspot.com/2007/03/raytracing-on-grid.html

string-bean-wasm/src/lib.rs

@@ -0,0 +1,56 @@
+/**
+ * Compute anchors for a circle
+ * @param {number} anchor_count 
+ * @param {number} width 
+ * @param {number} height 
+ * @param {number} radius 
+ * @returns {[number, number][]}
+ */
+export function circle_anchors(anchor_count, width, height, radius) {
+    const x_mid = width / 2;
+    const y_mid = height / 2;
+
+    return Array.from({ length: anchor_count })
+        .map((_, anchor) => (anchor * 2 * Math.PI) / anchor_count)
+        .map((angle) => [
+            x_mid + radius * Math.cos(angle),
+            y_mid + radius * Math.sin(angle),
+        ]);
+}
+
+/**
+ * Compute anchors for a rectangle. Starts in the top left.
+ * @param {number} anchor_count 
+ * @param {number} width 
+ * @param {number} height 
+ * @returns {[number, number][]}
+ */
+export function rectangle_anchors(anchor_count, width, height) {
+    /** @type {[number, number][]} */
+    const anchors = [[0, 0]];
+
+    const totalLength = width * 2 + height * 2;
+    const gapLength = totalLength / anchor_count;
+
+    let currentLength = 0;
+
+    for (let i = 1; i < anchor_count; i++) {
+        currentLength += gapLength;
+
+        if (currentLength < width) {
+            // walk top left to right
+            anchors.push([currentLength, 0]);
+        } else if (currentLength < width + height) {
+            // walk right top to bottom
+            anchors.push([width, currentLength - (width)]);
+        } else if (currentLength < width * 2 + height) {
+            // walk bottom right to left
+            anchors.push([2 * width - (currentLength - height), height]);
+        } else {
+            // walk left bottom to top
+            anchors.push([0, height + 2 * width - (currentLength - height)]);
+        }
+    }
+
+    return anchors;
+}