From 5e58cd63b6ce1087bebef2c513d89791f8613d22 Mon Sep 17 00:00:00 2001
From: Abbondanzo <peter@abbondanzo.com>
Date: Thu, 15 Aug 2019 00:05:40 -0400
Subject: [PATCH] Return elapsed time based on current frame

---
 src/eventbus/events/frame.ts |  1 +
 src/utils/FPSClock.ts        | 12 +++++++++++-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/src/eventbus/events/frame.ts b/src/eventbus/events/frame.ts
index 1480df7..bb2cffe 100644
--- a/src/eventbus/events/frame.ts
+++ b/src/eventbus/events/frame.ts
@@ -6,6 +6,7 @@ import EventBus from "../EventBus"
  */
 export interface FrameEvent {
   frame: number
+  elapsedTime: number
 }
 
 export const {
diff --git a/src/utils/FPSClock.ts b/src/utils/FPSClock.ts
index b89953f..aa2535d 100644
--- a/src/utils/FPSClock.ts
+++ b/src/utils/FPSClock.ts
@@ -111,6 +111,13 @@ export default class FPSClock {
     return delta / 1000
   }
 
+  /**
+   * Returns the elapsed time in milliseconds.
+   */
+  public getElapsedTime() {
+    return this.frameToDuration[this.currentFrame]
+  }
+
   private update() {
     if (!this.paused) {
       this.getElapsedFrames()
@@ -139,7 +146,10 @@ export default class FPSClock {
   }
 
   private doCallbacks() {
-    dispatchFrameEvent({ frame: this.currentFrame })
+    dispatchFrameEvent({
+      frame: this.currentFrame,
+      elapsedTime: this.getElapsedTime(),
+    })
   }
 
   /**