77 lines
1.4 KiB
JavaScript
77 lines
1.4 KiB
JavaScript
var pmath = {}
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var vector = use('vector')
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pmath.rand_int = function (max = 9007199254740991) {
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return Math.floor(Math.random() * max);
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};
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pmath.snap = function (val, grid) {
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if (!grid || grid === 1) return Math.round(val);
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var rem = val % grid;
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var d = val - rem;
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var i = Math.round(rem / grid) * grid;
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return d + i;
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};
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pmath.TAU = Math.PI * 2;
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pmath.deg2rad = function (deg) {
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return deg * 0.0174533;
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};
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pmath.rad2deg = function (rad) {
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return rad / 0.0174533;
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};
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pmath.turn2rad = function (x) {
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return x * Math.TAU;
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};
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pmath.rad2turn = function (x) {
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return x / Math.TAU;
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};
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pmath.turn2deg = function (x) {
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return x * 360;
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};
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pmath.deg2turn = function (x) {
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return x / 360;
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};
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pmath.randomint = function (max) {
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return Math.clamp(Math.floor(Math.random() * max), 0, max - 1);
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};
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pmath.variate = vector.variate;
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pmath.sortpointsccw = function (points) {
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var cm = points2cm(points);
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var cmpoints = points.map(function (x) {
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return x.sub(cm);
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});
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var ccw = cmpoints.sort(function (a, b) {
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var aatan = Math.atan2(a.y, a.x);
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var batan = Math.atan2(b.y, b.x);
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return aatan - batan;
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});
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return ccw.map(function (x) {
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return x.add(cm);
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});
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};
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pmath.sign = function (n) {
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return n >= 0 ? 1 : -1;
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};
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pmath.points2cm = function(points)
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{
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var x = 0;
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var y = 0;
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var n = points.length;
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points.forEach(function (p) {
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x = x + p[0];
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y = y + p[1];
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});
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return [x / n, y / n];
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}
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return pmath
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