@xtor/cga.js/src/struct/3d/Rectangle.ts

Xtor Compute Geometry Algorithm Libary 计算几何算法库

import { Vec3 } from '../../math/Vec3';
export class Rectangle extends Array {
    extent: number[];
    axis: Vec3[];
    center: Vec3;
    constructor(v0:Vec3, v1:Vec3, v2:Vec3, v3:Vec3) {
        super();
        if (!v3)
            v3 = v1.clone().sub(v0).add(v2.clone().sub(v0)).add(v0);

        this.push(v0, v1, v2, v3);
        var d01 = v1.clone().sub(v0);
        var d03 = v3.clone().sub(v0);
        this.extent = [d01.length() * 0.5, d03.length() * 0.5]
        this.axis = [d01.normalize(), d03.normalize()];
        this.center = v0.clone().add(v2).multiplyScalar(0.5);
    }
}