48 lines
1.0 KiB
JavaScript
48 lines
1.0 KiB
JavaScript
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export function index2coords(width, i) {
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return [i % width, Math.floor(i/width)];
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}
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export function coords2index(width, x, y) {
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return y * width + x;
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}
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export function random(min, max) {
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return min + Math.random() * (max-min);
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}
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export function randomInt(min, max) {
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return Math.round(random(min, max));
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}
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export function sample(arr) {
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return arr[randomInt(0, arr.length-1)];
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}
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export function clamp(min, x, max) {
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return Math.max(min, Math.min(x, max));
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}
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export function wrap(min, x, max) {
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return ((x-min + max-min) % (max-min)) + min;
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}
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export function within(x, y, tx, ty, r) {
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return Math.abs(x-tx) < r && Math.abs(y-ty) < r;
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}
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export function parable(t, x, y, a, v, w=0, g=9.8) {
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const fx = x + t*v * Math.cos(a) - 0.5 * -w * t*t;
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const fy = y + t*v * Math.sin(a) - 0.5 * -g * t*t;
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return [fx, fy];
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}
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export function vec(x, y, a, l) {
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a = a * Math.PI / 180;
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return [x+Math.cos(a)*l, y+Math.sin(a)*l];
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}
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export function deg2rad(a) { return a * Math.PI/180 }
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export function rad2deg(a) { return a * 180/Math.PI }
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