From c18321ceedd7be750f5789109c8503e4a36f39bf Mon Sep 17 00:00:00 2001
From: jules <jules@okfoc.us>
Date: Tue, 17 Dec 2013 09:00:29 -0500
Subject: dist & angle

---
 instructions.html | 2 ++
 js/util.js        | 4 +++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/instructions.html b/instructions.html
index 25f6e32..612cf2e 100644
--- a/instructions.html
+++ b/instructions.html
@@ -34,6 +34,8 @@ step(n,a,b)
 smoothstep(n,a,b)
 cosp, sinp (mapped to [0,1])
 pixel(x,y) == 4*(y*w+h)
+dist(x,y,a,b)
+angle(x,y,a,b)
 rand(n), randint(n)
 choice(array)
 deg(radians), rad(degrees)
diff --git a/js/util.js b/js/util.js
index bbf8674..7ecb20b 100644
--- a/js/util.js
+++ b/js/util.js
@@ -41,7 +41,9 @@ function choice(a){ return a[randint(a.length)] }
 function deg(n){ return n*180/PI }
 function rad(n){ return n*PI/180 }
 function pixel(x,y){ return 4*(y*w+x) }
-function mod(n,m){ return n-(m * Math.floor(n/m)) }
+function mod(n,m){ return n-(m * floor(n/m)) }
+function dist(x0,y0,x1,y1){ return sqrt(pow(x1-x0,2)+pow(y1-y0,2) }
+function angle(x0,y0,x1,y1){ return atan2(y1-y0,x1-x0) }
 
 function step (n,a,b) {
   return clamp((n - a) / (b - a), 0.0, 1.0);
-- 
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