1 files changed, 116 insertions, 0 deletions
diff --git a/js/util.js b/js/util.js
new file mode 100644
index 0000000..fac0faf
--- /dev/null
+++ b/js/util.js
@@ -0,0 +1,116 @@
+if (window.$) {
+  $.fn.int = function(){ return parseInt($(this).val(),10) }
+  $.fn.float = function(){ return parseFloat($(this).val()) }
+  $.fn.string = function(){ return trim($(this).val()) }
+  $.fn.enable = function() { return $(this).attr("disabled",null) }
+  $.fn.disable = function() { return $(this).attr("disabled","disabled") }
+}
+
+function noop(){}
+function trim(s){ return s.replace(/^\s+/,"").replace(/\s+$/,"") }
+
+var E = Math.E
+var PI = Math.PI
+var PHI = (1+Math.sqrt(5))/2
+var TWO_PI = PI*2
+var LN10 = Math.LN10
+function clamp(n,a,b){ return n<a?a:n<b?n:b }
+function norm(n,a,b){ return (n-a) / (b-a) }
+function lerp(n,a,b){ return (b-a)*n+a }
+function mix(n,a,b){ return a*(1-n)+b*n }
+function ceil(n){ return Math.ceil(n) }
+function floor(n){ return Math.floor(n) }
+function round(n){ return Math.round(n) }
+function max(a,b){ return Math.max(a,b) }
+function min(a,b){ return Math.min(a,b) }
+function abs(n){ return Math.abs(n) }
+function sign(n){ return Math.abs(n)/n }
+function pow(n,b) { return Math.pow(n,b) }
+function exp(n) { return Math.exp(n) }
+function log(n){ return Math.log(n) }
+function ln(n){ return Math.log(n)/LN10 }
+function sqrt(n) { return Math.sqrt(n) }
+function cos(n){ return Math.cos(n) }
+function sin(n){ return Math.sin(n) }
+function tan(n){ return Math.tan(n) }
+function acos(n){ return Math.cos(n) }
+function asin(n){ return Math.sin(n) }
+function atan(n){ return Math.atan(n) }
+function atan2(n){ return Math.atan2(n) }
+function sec(n){ return 1/cos(n) }
+function csc(n){ return 1/sin(n) }
+function cot(n){ return 1/tan(n) }
+function cosp(n){ return (1+Math.cos(n))/2 } // cos^2
+function sinp(n){ return (1+Math.sin(n))/2 }
+function random(){ return Math.random() }
+function rand(n){ return (Math.random()*n) }
+function randint(n){ return rand(n)|0 }
+function randrange(a,b){ return a + rand(b-a) }
+function randsign(){ return random() >= 0.5 ? -1 : 1 }
+function choice(a){ return a[randint(a.length)] }
+function deg(n){ return n*180/PI }
+function rad(n){ return n*PI/180 }
+function xor(a,b){ a=!!a; b=!!b; return (a||b) && !(a&&b) }
+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 avg(m,n,a){ return (m*(a-1)+n)/a }
+function quantize(a,b){ return ~~(a/b)*b }
+
+function pixel(x,y){ return 4*(mod(y,actual_h)*actual_w+mod(x,actual_w)) }
+function rgbpixel(d,x,y){
+  var p = pixel(~~x,~~y)
+  r = d[p]
+  g = d[p+1]
+  b = d[p+2]
+  a = d[p+3]
+}
+function fit(d,x,y){ rgbpixel(d,x*actual_w/w,y*actual_h/h) }
+
+function step(a, b){
+  return (b >= a) + 0 
+               // ^^ bool -> int
+}
+
+
+function julestep (a,b,n) {
+  return clamp(norm(n,a,b), 0.0, 1.0);
+}
+
+// hermite curve apparently
+function smoothstep(min,max,n){
+  var t = clamp((n - min) / (max - min), 0.0, 1.0);
+  return t * t * (3.0 - 2.0 * t)
+}
+
+function shuffle(a){
+  for (var i = a.length; i > 0; i--){
+    var r = randint(i)
+    var swap = a[i-1]
+    a[i-1] = a[r]
+    a[r] = swap
+  }
+  return a
+}
+function reverse(a){
+  var reversed = []
+  for (var i = 0, _len = a.length-1; i <= _len; i++){
+    reversed[i] = a[_len-i]
+  }
+  return reversed
+}
+function deinterlace(a){
+  var odd = [], even = []
+  for (var i = 0, _len = a.length; i < _len; i++) {
+    if (i % 2) even.push(a[i])
+    else odd.push(a[i])
+  }
+  return [even, odd]
+}
+function weave(a){
+  var aa = deinterlace(a)
+  var b = []
+  aa[0].forEach(function(el){ b.push(el) })
+  reverse(aa[1]).forEach(function(el){ b.push(el) })
+  return b
+}
+\ No newline at end of file