WebCAD/__test__/Polyline/PolylineGetPointAtParam.test.ts

import { Vector2 } from "three";
import { Polyline } from "../../src/DatabaseServices/Polyline";
import { equaln } from "../../src/Geometry/GeUtils";

test('获得点,来自参数', () =>
{
    let pl = new Polyline([
        {
            pt: new Vector2(0, 0),
            bul: 0
        },
        {
            pt: new Vector2(5, 0),
            bul: 1
        },
        {
            pt: new Vector2(5, 5),
            bul: -1
        },
        {
            pt: new Vector2(5, 10),
            bul: 0
        },
        {
            pt: new Vector2(0, 10),
            bul: 0
        },
        {
            pt: new Vector2(0, 0),
            bul: 0
        }
    ]);

    //不闭合时
    pl.CloseMark = false;
    for (let p = -2; p < 7; p += 0.2)
    {
        let pt = pl.GetPointAtParam(p);

        //反向测试
        if (pt)
        {
            let pn = pl.GetParamAtPoint(pt);

            if (equaln(pn, 0))
            {
                expect(equaln(p, 0) || equaln(p, pl.EndParam)).toBeTruthy();
            }
            else
            {
                expect(equaln(p, pn)).toBeTruthy();
            }
        }
        //测试一阶导数
        let deriv = pl.GetFistDeriv(p);
        expect(deriv).toMatchSnapshot();
        expect(pt).toMatchSnapshot();
    }
    //闭合时
    pl.CloseMark = true;
    for (let p = -2; p < 7; p += 0.3)
    {
        let pt = pl.GetPointAtParam(p);

        //反向测试
        if (pt)
        {
            let pn = pl.GetParamAtPoint(pt);

            if (equaln(pn, 0))
            {
                expect(equaln(pn, 0) || equaln(p, pl.EndParam)).toBeTruthy();
            }
            else
            {
                expect(equaln(p, pn)).toBeTruthy();
            }
        }

        //测试一阶导数
        let deriv = pl.GetFistDeriv(p);
        expect(deriv).toMatchSnapshot();
        expect(pt).toMatchSnapshot();
    }
});