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Diffstat (limited to 'assets/javascripts/util.js')
| -rw-r--r-- | assets/javascripts/util.js | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/assets/javascripts/util.js b/assets/javascripts/util.js new file mode 100644 index 0000000..6d7e966 --- /dev/null +++ b/assets/javascripts/util.js @@ -0,0 +1,160 @@ +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 $(this).attr("disabled","disabled") } +} + +function trim(s){ return s.replace(/^\s+/,"").replace(/\s+$/,"") } + +var E = Math.E +var PI = Math.PI +var PHI = (1+Math.sqrt(5))/2 +function clamp(n,a,b){ return n<a?a:n<b?n:b } +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 sqrt(n) { return Math.sqrt(n,b) } +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 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 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((n - a) / (b - a), 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 +} + + +var guid_syllables = "iz az ez or iv ex baz el lo lum ot un no".split(" ") +var guid_n = 0 +function guid(n){ + var len = guid_syllables.length + return ((++guid_n*(len-1)*(~~log(guid_n))).toString(len)).split("").map(function(s){ + return guid_syllables[parseInt(s, len) % len--] + }).join("") +} + +function defaults (dest, src) { + dest = dest || {} + for (var i in src) { + dest[i] = typeof dest[i] == 'undefined' ? src[i] : dest[i] + } + return dest +} + +// Change straight quotes to curly and double hyphens to em-dashes. +function smarten(a) { + a = a.replace(/(^|[-\u2014\s(\["])'/g, "$1\u2018"); // opening singles + a = a.replace(/'/g, "\u2019"); // closing singles & apostrophes + a = a.replace(/(^|[-\u2014/\[(\u2018\s])"/g, "$1\u201c"); // opening doubles + a = a.replace(/"/g, "\u201d"); // closing doubles + a = a.replace(/--/g, "\u2014"); // em-dashes + return a +}; + +(function() { + var lastTime = 0; + var vendors = ['ms', 'moz', 'webkit', 'o']; + for(var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) { + window.requestAnimationFrame = window[vendors[x]+'RequestAnimationFrame']; + window.cancelAnimationFrame = window[vendors[x]+'CancelAnimationFrame'] + || window[vendors[x]+'CancelRequestAnimationFrame']; + } + + if (!window.requestAnimationFrame) + window.requestAnimationFrame = function(callback, element) { + var currTime = new Date().getTime(); + var timeToCall = Math.max(0, 16 - (currTime - lastTime)); + var id = window.setTimeout(function() { callback(currTime + timeToCall); }, + timeToCall); + lastTime = currTime + timeToCall; + return id; + }; + + if (!window.cancelAnimationFrame) + window.cancelAnimationFrame = function(id) { + clearTimeout(id); + }; +}()); |