From 1c2acd3320963884821d52530b24637abd88354f Mon Sep 17 00:00:00 2001
From: Nat Lasseter <Nat Lasseter nathan@bytemark.co.uk>
Date: Wed, 28 Jun 2017 19:55:45 +0100
Subject: Causally air resistance.

---
 particle.js | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'particle.js')

diff --git a/particle.js b/particle.js
index 66f4f6e..c62dd47 100644
--- a/particle.js
+++ b/particle.js
@@ -9,6 +9,12 @@ function Particle(x, y, m, c) {
     this.acc.add(p5.Vector.div(force, this.mass));
   }
 
+  this.applyDrag = function(drag_coeff) {
+    var rev_vel = createVector().sub(this.vel);
+    var drag = rev_vel.mult(drag_coeff);
+    this.applyForce(drag);
+  }
+
   this.update = function() {
     this.vel.add(this.acc);
     this.pos.add(this.vel);
-- 
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