108 lines
2.5 KiB
TypeScript
108 lines
2.5 KiB
TypeScript
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/**
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* @description 扩展方法，提供 gl-matrix 为提供的方法
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* */
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import { mat3, vec2 } from 'gl-matrix';
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type mat3Type = [number, number, number, number, number, number, number, number, number];
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export function leftTranslate(out, a, v) {
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const transMat: mat3Type = [ 0, 0, 0, 0, 0, 0, 0, 0, 0 ];
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mat3.fromTranslation(transMat, v);
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return mat3.multiply(out, transMat, a);
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}
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export function leftRotate(out, a, rad) {
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const rotateMat: mat3Type = [ 0, 0, 0, 0, 0, 0, 0, 0, 0 ];
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mat3.fromRotation(rotateMat, rad);
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return mat3.multiply(out, rotateMat, a);
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}
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export function leftScale(out, a, v) {
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const scaleMat: mat3Type = [ 0, 0, 0, 0, 0, 0, 0, 0, 0 ];
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mat3.fromScaling(scaleMat, v);
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return mat3.multiply(out, scaleMat, a);
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}
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function leftMultiply(out, a, a1) {
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return mat3.multiply(out, a1, a);
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}
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/**
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* 根据 actions 来做 transform
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* @param m
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* @param actions
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*/
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export function transform(m: number[], actions: any[][]) {
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const matrix = m ? [].concat(m) : [ 1, 0, 0, 0, 1, 0, 0, 0, 1 ];
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for (let i = 0, len = actions.length; i < len; i++) {
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const action = actions[i];
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switch (action[0]) {
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case 't':
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leftTranslate(matrix, matrix, [ action[1], action[2] ]);
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break;
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case 's':
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leftScale(matrix, matrix, [ action[1], action[2] ]);
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break;
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case 'r':
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leftRotate(matrix, matrix, action[1]);
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break;
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case 'm':
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leftMultiply(matrix, matrix, action[1]);
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break;
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default:
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break;
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}
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}
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return matrix;
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}
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/**
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* 向量 v1 到 向量 v2 夹角的方向
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* @param {Array} v1 向量
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* @param {Array} v2 向量
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* @return {Boolean} >= 0 顺时针 < 0 逆时针
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*/
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export function direction(v1: number[], v2: number[]): number {
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return v1[0] * v2[1] - v2[0] * v1[1];
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}
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/**
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* 二维向量 v1 到 v2 的夹角
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* @param v1
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* @param v2
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* @param direct
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*/
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export function angleTo(v1: [number, number], v2: [number, number], direct: boolean): number {
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const ang = vec2.angle(v1, v2);
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const angleLargeThanPI = direction(v1, v2) >= 0;
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if (direct) {
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if (angleLargeThanPI) {
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return Math.PI * 2 - ang;
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}
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return ang;
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}
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if (angleLargeThanPI) {
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return ang;
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}
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return Math.PI * 2 - ang;
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}
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/**
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* 计算二维向量的垂直向量
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* @param out
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* @param v
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* @param flag
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*/
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export function vertical(out: number[], v: number[], flag: boolean): number[] {
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if (flag) {
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out[0] = v[1];
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out[1] = -1 * v[0];
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} else {
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out[0] = -1 * v[1];
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out[1] = v[0];
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}
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return out;
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}
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