From 66d0a0b2e2531b61ef513b68c41128aa2df4a95e Mon Sep 17 00:00:00 2001
From: Nat Lasseter <Nat Lasseter nathan@bytemark.co.uk>
Date: Thu, 29 Jun 2017 10:57:11 +0100
Subject: start of work on p-p collisions

---
 particle.js | 8 ++++++++
 sketch.js   | 5 +++++
 2 files changed, 13 insertions(+)

diff --git a/particle.js b/particle.js
index bfafa87..fc7d249 100644
--- a/particle.js
+++ b/particle.js
@@ -49,4 +49,12 @@ function Particle(x, y, m, c) {
         dist(x1, y1, x2, y2)
       ) < 2;
   }
+
+  this.collide = function(otherp) {
+    var dist = function(x1, y1, x2, y2) {
+      return Math.sqrt(Math.pow(x1 - x2, 2) + Math.pow(y1 - y2, 2));
+    };
+
+    return dist(this.pos.x, this.pos.y, otherp.pos.x, otherp.pos.y) < this.mass + otherp.mass;
+  }
 }
diff --git a/sketch.js b/sketch.js
index 473c192..34fb7b5 100644
--- a/sketch.js
+++ b/sketch.js
@@ -32,6 +32,11 @@ function draw() {
       ps[i].reflect(createVector(0.25*wid, -0.25*hei), 5);
     }
 
+    for(var j = ps.length - 1; j >= 0; j--) {
+      if(i != j && ps[i].collide(ps[j]))
+        console.log("COLLIDE" + ps[i] + ps[j]);
+    }
+
     if (ps[i].pos.y >= hei)
       ps.splice(i, 1);
   }
-- 
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