1 files changed, 43 insertions, 0 deletions
diff --git a/instructions.html b/instructions.html
new file mode 100644
index 0000000..2903dc1
--- /dev/null
+++ b/instructions.html
@@ -0,0 +1,43 @@
+<!doctype html>
+<html>
+<head>
+<title>instructions</title>
+<style type="text/css">
+html,body{margin:0;padding:5px; }
+pre { font-family: serif; font-size: 14px; margin:0;padding:0;}
+u{ color: #866; }
+i{ color: #666; }
+</style>
+</head>
+<body>
+<pre id="pre"><u>function parameters</u>
+x, y = position of pixel
+t = current time (ms)
+d = imageData array
+r, g, b, a = color values
+
+<u>Math aliases</u>
+floor, ceil, round, abs, sign
+pow, exp, sqrt
+sin, cos, tan
+asin, acos, atan, atan2
+random()
+E, PI
+
+<u>convenience functions</u>
+clamp(n,min,max)
+lerp(n,a,b)
+mix(n,a,b)
+step(n,a,b)
+smoothstep(n,a,b)
+sinp, cosp (mapped to [0,1])
+pixel(x,y) == 4*(y*w+h)
+rand(n), randint(n)
+choice(array)
+deg(radians), rad(degrees)
+</pre>
+</body>
+<script>
+pre.innerHTML = pre.innerHTML.replace(/\(/g,"(<i>").replace(/\)/g,"</i>)")
+</script>
+</html>