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https://github.com/xibyte/jsketcher
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120 lines
2.1 KiB
JavaScript
120 lines
2.1 KiB
JavaScript
function scalarOperand(v, out, func) {
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for (let i = 0; i < v.length; i++) {
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out[i] = func(v[i]);
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}
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return out;
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}
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function vectorOperand(v1, v2, out, func) {
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for (let i = 0; i < v1.length; i++) {
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out[i] = func(v1[i], v2[i]);
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}
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return out;
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}
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export function __mul(v, scalar, out) {
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return scalarOperand(v, out, x => x * scalar);
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}
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export function _mul(v, scalar) {
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return __mul(v, scalar, v);
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}
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export function mul(v, scalar) {
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return __mul(v, scalar, []);
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}
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export function __div(v, scalar, out) {
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return scalarOperand(v, out, x => x / scalar);
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}
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export function _div(v, scalar) {
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return __div(v, scalar, v);
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}
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export function div(v, scalar) {
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return __div(v, scalar, []);
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}
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export function __add(v1, v2, out) {
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return vectorOperand(v1, v2, out, (x1, x2) => x1 + x2);
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}
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export function _add(v1, v2) {
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return __add(v1, v2, v1);
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}
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export function add(v1, v2) {
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return __add(v1, v2, []);
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}
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export function __sub(v1, v2, out) {
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return vectorOperand(v1, v2, out, (x1, x2) => x1 - x2);
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}
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export function _sub(v1, v2) {
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return __sub(v1, v2, v1);
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}
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export function sub(v1, v2) {
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return __sub(v1, v2, []);
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}
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export function __negate(v, out) {
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return scalarOperand(v, out, x => -x);
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}
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export function _negate(v) {
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return __negate(v, v);
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}
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export function negate(v) {
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return __negate(v, []);
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}
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export function dot(v1, v2) {
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let sum = 0;
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for (let i = 0; i < v1.length; i++) {
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sum += v1[i] * v2[i];
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}
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return sum;
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}
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export function __cross(v1, v2, out) {
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out[0] = v1[1] * v2[2] - v1[2] * v2[1];
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out[1] = v1[2] * v2[0] - v1[0] * v2[2];
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out[2] = v1[0] * v2[1] - v1[1] * v2[0];
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return out;
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}
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export function cross(v1, v2) {
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return __cross(v1, v2, []);
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}
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export function __normalize(v, out) {
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const mag = length(v);
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if (mag === 0.0) {
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out[0] = out[1] = out[2] = 0;
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}
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return __div(v, mag, out)
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}
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export function _normalize(v) {
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return __normalize(v, v);
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}
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export function normalize(v) {
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return __normalize(v, []);
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}
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export function lengthSq(v) {
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return dot(v, v);
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}
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export function length(v) {
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return Math.sqrt(lengthSq(v));
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}
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