From 49cb0efe7274a5c632cfa21f691ca6dc2fef28de Mon Sep 17 00:00:00 2001
From: Nathan Kunicki <me@nathankunicki.com>
Date: Sun, 14 Feb 2016 18:06:51 +0000
Subject: [PATCH] Optimised particle fields

---
 examples/particles/particles.js | 10 +++++-----
 src/classes/entity.js           |  4 ++++
 src/classes/game.js             |  4 +++-
 3 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/examples/particles/particles.js b/examples/particles/particles.js
index a2afdf9..d842993 100644
--- a/examples/particles/particles.js
+++ b/examples/particles/particles.js
@@ -9,11 +9,11 @@ class BlueParticle extends MomentumEngine.Classes.Rect {
 
     constructor (x, y) {
         super(x, y, 1, 1, new MomentumEngine.Classes.Color(255, 255, 255, 0));
-        this.timeToLive = 15000;
+        this.timeToLive = 25500;
     }
 
     update (delta) {
-        this.color.a = this.color.a - (delta * 0.00005);
+        this.color.a = this.color.a - (delta * 0.00004);
     }
 
 }
@@ -46,10 +46,10 @@ window.onload = function () {
     let rect = new MomentumEngine.Classes.Rect(width / 8 - baseSize, height / 2 - baseSize, baseSize * 2, baseSize * 2, red),
         emitter = new MomentumEngine.Classes.Emitter(baseSize, baseSize, 4, new MomentumEngine.Classes.Vector2D(0, 0.05), BlueParticle);
 
-    let fieldRect = new MomentumEngine.Classes.Rect(width - (baseSize * 33), height - (baseSize * 10), baseSize * 2, baseSize * 2, blue),
+    let fieldRect = new MomentumEngine.Classes.Rect(width - (baseSize * 33), height - (baseSize * 11), baseSize * 2, baseSize * 2, blue),
         field = new MomentumEngine.Classes.Field(baseSize, baseSize, 0.1);
 
-    let fieldRect2 = new MomentumEngine.Classes.Rect(width - (baseSize * 33), baseSize * 10, baseSize * 2, baseSize * 2, blue),
+    let fieldRect2 = new MomentumEngine.Classes.Rect(width - (baseSize * 33), baseSize * 9, baseSize * 2, baseSize * 2, blue),
         field2 = new MomentumEngine.Classes.Field(baseSize, baseSize, 0.1);
 
     mainScene.addChildEntity(rect);
@@ -82,7 +82,7 @@ window.onload = function () {
 
     emitter.setParticleParent(mainScene);
     emitter.particleFields.push(field, field2);
-    //emitter.spread = Math.PI / 32;
+    emitter.spread = Math.PI / 8;
     emitter.emitting = true;
 
     particles.start();
diff --git a/src/classes/entity.js b/src/classes/entity.js
index b2232b9..93be8eb 100644
--- a/src/classes/entity.js
+++ b/src/classes/entity.js
@@ -195,6 +195,10 @@ class Entity {
 
         let rendered = this.render && this.render();
 
+        if (rendered) {
+            this._game._lastFrameTotalRenders++;
+        }
+
         if (rendered || (typeof rendered == "undefined") || (typeof this.render === "undefined")) {
 
             this.children.forEach((child) => {
diff --git a/src/classes/game.js b/src/classes/game.js
index 283a47d..976c7b3 100644
--- a/src/classes/game.js
+++ b/src/classes/game.js
@@ -95,6 +95,7 @@ class Game extends Entity {
 
         this._game = this;
         this._lastFrameTimestamp = 0;
+        this._lastFrameTotalRenders = 0;
         this._wantPause = true;
 
     }
@@ -146,8 +147,9 @@ class Game extends Entity {
             let currentTimestamp = +(new Date()),
                 delta = currentTimestamp - self._lastFrameTimestamp;
 
-            delta = Math.min(delta, 1000 / self.desiredFps);
+            //delta = Math.min(delta, 1000 / self.desiredFps);
             self._lastFrameTimestamp = currentTimestamp;
+            self._lastFrameTotalRenders = 0;
 
             self.step(delta);