@visactor/vrender-core/es/common/bezier-utils.js

## Description

import { PointService, Point } from "@visactor/vutils";

export function snapLength(xArr, yArr) {
    let totalLength = 0;
    const count = xArr.length;
    for (let i = 0; i < count; i++) {
        const x = xArr[i], y = yArr[i], nextX = xArr[(i + 1) % count], nextY = yArr[(i + 1) % count];
        totalLength += PointService.distanceNN(x, y, nextX, nextY);
    }
    return totalLength / 2;
}

export function cubicLength(p0, p1, p2, p3, iterationCount) {
    return snapLength([ p0.x, p1.x, p2.x, p3.x ], [ p0.y, p1.y, p2.y, p3.y ]);
}

export function cubicCalc(p0, p1, p2, p3, t) {
    const one = 1 - t;
    return one * one * one * p0 + 3 * p1 * t * one * one + 3 * p2 * t * t * one + p3 * t * t * t;
}

export function cubicPointAt(p0, p1, p2, p3, t) {
    const x = cubicCalc(p0.x, p1.x, p2.x, p3.x, t), y = cubicCalc(p0.y, p1.y, p2.y, p3.y, t);
    return new Point(x, y);
}

export function quadCalc(p0, p1, p2, t) {
    const one = 1 - t;
    return one * one * p0 + 2 * one * t * p1 + t * t * p2;
}

export function quadPointAt(p0, p1, p2, t) {
    const x = quadCalc(p0.x, p1.x, p2.x, t), y = quadCalc(p0.y, p1.y, p2.y, t);
    return new Point(x, y);
}

export function quadLength(p0, p1, p2, iterationCount) {
    return snapLength([ p0.x, p1.x, p2.x ], [ p0.y, p1.y, p2.y ]);
}
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