From 19995cf23303fee4418554fcb96785d2cfd8de87 Mon Sep 17 00:00:00 2001
From: spacex_2020 <540240126@qq.com>
Date: Sat, 22 Apr 2023 23:22:32 +0800
Subject: [PATCH] feat: Added animation seek method to display graphics at a
 certain point in time

---
 src/animation/Animation.ts | 14 ++++++++++++++
 src/animation/Clip.ts      |  8 ++++++++
 2 files changed, 22 insertions(+)

diff --git a/src/animation/Animation.ts b/src/animation/Animation.ts
index cf2ec8569..b901bceda 100644
--- a/src/animation/Animation.ts
+++ b/src/animation/Animation.ts
@@ -194,6 +194,20 @@ export default class Animation extends Eventful {
         this._startLoop();
     }
 
+    seek(timestamp: number) {
+        this._time = getTime() - timestamp;
+        let clip = this._head;
+        while(clip) {
+            clip.loop = true;
+            clip.setStartTime(this._time + clip.getDelay());
+            clip = clip.next;
+        }
+        this._pausedTime = 0;
+        this._pauseStart = getTime();
+        this._paused = true;
+        this.update();
+    }
+
     /**
      * Stop animation.
      */
diff --git a/src/animation/Clip.ts b/src/animation/Clip.ts
index 0acf6bf40..b71d3a719 100644
--- a/src/animation/Clip.ts
+++ b/src/animation/Clip.ts
@@ -75,6 +75,14 @@ export default class Clip {
         opts.easing && this.setEasing(opts.easing);
     }
 
+    getDelay() {
+        return this._delay;
+    }
+
+    setStartTime(startTime: number) {
+        this._startTime = startTime;
+    }
+
     step(globalTime: number, deltaTime: number): boolean {
         // Set startTime on first step, or _startTime may has milleseconds different between clips
         // PENDING