From f29aa6c8934ad995b375085de37e23e72f918ea6 Mon Sep 17 00:00:00 2001
From: nova1751 <nova2319427728@outlook.com>
Date: Sun, 25 Aug 2024 01:14:44 +0800
Subject: [PATCH] perf: optimize the performance when the cursor is still

---
 package.json        |  1 +
 pnpm-lock.yaml      |  4 ++++
 src/utils/cursor.js | 19 ++++++++++++++-----
 3 files changed, 19 insertions(+), 5 deletions(-)

diff --git a/package.json b/package.json
index 392e21ca1..537502637 100644
--- a/package.json
+++ b/package.json
@@ -20,6 +20,7 @@
     "dayjs": "^1.11.10",
     "element-plus": "^2.7.1",
     "fetch-jsonp": "^1.3.0",
+    "lodash-es": "^4.17.21",
     "pinia": "^2.1.7",
     "pinia-plugin-persistedstate": "^3.2.1",
     "swiper": "^11.1.1",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 148eb7541..ea2a47d48 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -26,6 +26,9 @@ importers:
       fetch-jsonp:
         specifier: ^1.3.0
         version: 1.3.0
+      lodash-es:
+        specifier: ^4.17.21
+        version: 4.17.21
       pinia:
         specifier: ^2.1.7
         version: 2.1.7(vue@3.4.24)
@@ -2405,6 +2408,7 @@ packages:
 
   workbox-google-analytics@6.6.0:
     resolution: {integrity: sha512-p4DJa6OldXWd6M9zRl0H6vB9lkrmqYFkRQ2xEiNdBFp9U0LhsGO7hsBscVEyH9H2/3eZZt8c97NB2FD9U2NJ+Q==}
+    deprecated: It is not compatible with newer versions of GA starting with v4, as long as you are using GAv3 it should be ok, but the package is not longer being maintained
 
   workbox-navigation-preload@6.6.0:
     resolution: {integrity: sha512-utNEWG+uOfXdaZmvhshrh7KzhDu/1iMHyQOV6Aqup8Mm78D286ugu5k9MFD9SzBT5TcwgwSORVvInaXWbvKz9Q==}
diff --git a/src/utils/cursor.js b/src/utils/cursor.js
index 49f858c47..8fce9a76b 100644
--- a/src/utils/cursor.js
+++ b/src/utils/cursor.js
@@ -1,6 +1,13 @@
+import { isEqual } from "lodash-es";
+
 let mainCursor;
 
-Math.lerp = (a, b, n) => (1 - n) * a + n * b;
+const lerp = (a, b, n) => {
+  if (Math.round(a) === b) {
+    return b;
+  }
+  return (1 - n) * a + n * b;
+};
 
 const getStyle = (el, attr) => {
   try {
@@ -49,7 +56,6 @@ class Cursor {
     document.body.appendChild((this.scr = document.createElement("style")));
     this.scr.innerHTML = `* {cursor: url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 8 8' width='10px' height='10px'><circle cx='4' cy='4' r='4' fill='white' /></svg>") 4 4, auto !important}`;
   }
-
   refresh() {
     this.scr.remove();
     this.cursor.classList.remove("active");
@@ -72,6 +78,7 @@ class Cursor {
         y: e.clientY - 8,
       };
       this.cursor.classList.remove("hidden");
+      this.render();
     };
     document.onmouseenter = () => this.cursor.classList.remove("hidden");
     document.onmouseleave = () => this.cursor.classList.add("hidden");
@@ -81,13 +88,15 @@ class Cursor {
 
   render() {
     if (this.pos.prev) {
-      this.pos.prev.x = Math.lerp(this.pos.prev.x, this.pos.curr.x, 0.35);
-      this.pos.prev.y = Math.lerp(this.pos.prev.y, this.pos.curr.y, 0.35);
+      this.pos.prev.x = lerp(this.pos.prev.x, this.pos.curr.x, 0.35);
+      this.pos.prev.y = lerp(this.pos.prev.y, this.pos.curr.y, 0.35);
       this.move(this.pos.prev.x, this.pos.prev.y);
     } else {
       this.pos.prev = this.pos.curr;
     }
-    requestAnimationFrame(() => this.render());
+    if (!isEqual(this.pos.curr, this.pos.prev)) {
+      requestAnimationFrame(() => this.render());
+    }
   }
 }