xtorcga/dist/src/render/mesh.js

Xtor Compute Geometry Algorithm Libary 计算几何算法库

"use strict";
var __spreadArrays = (this && this.__spreadArrays) || function () {
    for (var s = 0, i = 0, il = arguments.length; i < il; i++) s += arguments[i].length;
    for (var r = Array(s), k = 0, i = 0; i < il; i++)
        for (var a = arguments[i], j = 0, jl = a.length; j < jl; j++, k++)
            r[k] = a[j];
    return r;
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.trianglutionToGeometryBuffer = exports.toGeoBuffer = exports.triangListToBuffer = exports.indexable = void 0;
/*
 * @Description  :
 * @Author       : 赵耀圣
 * @Q群           : 632839661
 * @Date         : 2020-12-10 15:01:42
 * @LastEditTime : 2021-03-11 09:09:57
 * @FilePath     : \cga.js\src\render\mesh.ts
 */
var Vec3_1 = require("../math/Vec3");
var array_1 = require("../utils/array");
var geometry_1 = require("./geometry");
var trianglution_1 = require("../alg/trianglution");
function indexable(obj, refIndexInfo, force) {
    if (refIndexInfo === void 0) { refIndexInfo = { index: 0 }; }
    if (force === void 0) { force = false; }
    if (obj instanceof Array) {
        for (var i = 0; i < obj.length; i++)
            indexable(obj[i], refIndexInfo);
    }
    else if (obj instanceof Object) {
        if (obj.index === undefined)
            obj.index = refIndexInfo.index++;
        else if (force)
            obj.index = refIndexInfo.index++;
    }
}
exports.indexable = indexable;
function triangListToBuffer(vertices, triangleList) {
    indexable(triangleList);
    var indices = [];
    array_1.forall(triangleList, function (v) {
        indices.push(v.index);
    });
    return toGeoBuffer(vertices, indices);
}
exports.triangListToBuffer = triangListToBuffer;
/**
 * 顶点纹理坐标所以转化为buffer数据
 * @param {Array<Verctor3|Number>} vertices
 * @param {Array<Number>} indices
 * @param {Array<Verctor2|Number>} uvs
 */
function toGeoBuffer(vertices, indices, uvs) {
    var geometry = new geometry_1.BufferGeometry();
    geometry.addAttribute('position', vertices, 3);
    geometry.addAttribute('uv', uvs || new Float32Array(geometry.getAttribute('position').array.length / 3 * 2), 2);
    geometry.setIndex(indices);
    return geometry;
}
exports.toGeoBuffer = toGeoBuffer;
/**
 * 三角剖分后转成几何体
 * 只考虑XY平面
 * @param {*} boundary
 * @param {*} hole
 * @param {*} options
 */
function trianglutionToGeometryBuffer(boundary, holes, options) {
    if (holes === void 0) { holes = []; }
    if (options === void 0) { options = { normal: Vec3_1.Vec3.UnitZ }; }
    var triangles = trianglution_1.triangulation(boundary, holes, options);
    var vertices = __spreadArrays(boundary, array_1.flat(holes));
    var uvs = [];
    vertices.forEach(function (v) {
        uvs.push(v.x, v.z);
    });
    var geometry = toGeoBuffer(vertices, triangles, uvs);
    return geometry;
}
exports.trianglutionToGeometryBuffer = trianglutionToGeometryBuffer;