From 8686c06f1f30fa722201db011d0663b969ad0ebf Mon Sep 17 00:00:00 2001
From: Steve Ruiz <steveruizok@gmail.com>
Date: Wed, 7 Sep 2022 13:43:40 +0100
Subject: [PATCH] Update examples

---
 packages/dev/src/state/shapes/draw.tsx        | 37 ++++++++++++-------
 packages/perfect-freehand/README.md           | 34 +++++++++++------
 .../src/test/getStroke.spec.ts                | 35 ++++++++++++------
 3 files changed, 68 insertions(+), 38 deletions(-)

diff --git a/packages/dev/src/state/shapes/draw.tsx b/packages/dev/src/state/shapes/draw.tsx
index 35bbbcc..5ff3dd7 100644
--- a/packages/dev/src/state/shapes/draw.tsx
+++ b/packages/dev/src/state/shapes/draw.tsx
@@ -231,21 +231,30 @@ export class DrawUtil extends TLShapeUtil<T, E> {
   }
 }
 
+const average = (a: number, b: number) => (a + b) / 2
+
 function getSvgPathFromStroke(points: number[][]): string {
-  if (!points.length) return ''
-
-  return points
-    .reduce(
-      (acc, point, i, arr) => {
-        if (i === points.length - 1)
-          acc.push(point, Vec.med(point, arr[0]), 'Z')
-        else acc.push(point, Vec.med(point, arr[i + 1]))
-        return acc
-      },
-      ['M', points[0], 'Q']
-    )
-    .join(' ')
-    .replaceAll(/(\s?[A-Z]?,?-?[0-9]*\.[0-9]{0,2})(([0-9]|e|-)*)/g, '$1')
+  const len = points.length
+
+  if (!len) {
+    return ''
+  }
+
+  const first = points[0]
+  let result = `M${first[0].toFixed(3)},${first[1].toFixed(3)}Q`
+
+  for (let i = 0, max = len - 1; i < max; i++) {
+    const a = points[i]
+    const b = points[i + 1]
+    result += `${a[0].toFixed(3)},${a[1].toFixed(3)} ${average(
+      a[0],
+      b[0]
+    ).toFixed(3)},${average(a[1], b[1]).toFixed(3)} `
+  }
+
+  result += 'Z'
+
+  return result
 }
 
 export function dot([x, y]: number[]) {
diff --git a/packages/perfect-freehand/README.md b/packages/perfect-freehand/README.md
index 3b74c08..3ceed69 100644
--- a/packages/perfect-freehand/README.md
+++ b/packages/perfect-freehand/README.md
@@ -262,20 +262,30 @@ While `getStroke` returns an array of points representing the outline of a strok
 The function below will turn the points returned by `getStroke` into SVG path data.
 
 ```js
+const average = (a, b) => (a + b) / 2
+
 function getSvgPathFromStroke(stroke) {
-  if (!stroke.length) return ''
-
-  const d = stroke.reduce(
-    (acc, [x0, y0], i, arr) => {
-      const [x1, y1] = arr[(i + 1) % arr.length]
-      acc.push(x0, y0, (x0 + x1) / 2, (y0 + y1) / 2)
-      return acc
-    },
-    ['M', ...stroke[0], 'Q']
-  )
+  const len = points.length
 
-  d.push('Z')
-  return d.join(' ')
+  if (!len) {
+    return ''
+  }
+
+  const first = points[0]
+  let result = `M${first[0].toFixed(3)},${first[1].toFixed(3)}Q`
+
+  for (let i = 0, max = len - 1; i < max; i++) {
+    const a = points[i]
+    const b = points[i + 1]
+    result += `${a[0].toFixed(3)},${a[1].toFixed(3)} ${average(
+      a[0],
+      b[0]
+    ).toFixed(3)},${average(a[1], b[1]).toFixed(3)} `
+  }
+
+  result += 'Z'
+
+  return result
 }
 ```
 
diff --git a/packages/perfect-freehand/src/test/getStroke.spec.ts b/packages/perfect-freehand/src/test/getStroke.spec.ts
index 7d235af..ce78ec4 100644
--- a/packages/perfect-freehand/src/test/getStroke.spec.ts
+++ b/packages/perfect-freehand/src/test/getStroke.spec.ts
@@ -27,19 +27,30 @@ function getRng(seed = ''): () => number {
   return next
 }
 
+const average = (a: number, b: number) => (a + b) / 2
+
 function getSvgPathFromStroke(points: number[][]): string {
-  if (!points.length) return ''
-
-  return points
-    .reduce(
-      (acc, point, i, arr) => {
-        if (i === points.length - 1) acc.push(point, med(point, arr[0]))
-        else acc.push(point, med(point, arr[i + 1]))
-        return acc
-      },
-      ['M', points[0], 'Q']
-    )
-    .join(' ')
+  const len = points.length
+
+  if (!len) {
+    return ''
+  }
+
+  const first = points[0]
+  let result = `M${first[0].toFixed(3)},${first[1].toFixed(3)}Q`
+
+  for (let i = 0, max = len - 1; i < max; i++) {
+    const a = points[i]
+    const b = points[i + 1]
+    result += `${a[0].toFixed(3)},${a[1].toFixed(3)} ${average(
+      a[0],
+      b[0]
+    ).toFixed(3)},${average(a[1], b[1]).toFixed(3)} `
+  }
+
+  result += 'Z'
+
+  return result
 }
 
 describe('getStroke', () => {