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Co-Authored-By: 狸花猫/Claude-Qwen3.6-Plus 🐾
113 lines
3.6 KiB
JavaScript
113 lines
3.6 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.distanceAtSegment = exports.angleAtSegments = exports.pointAtSegments = exports.lengthOfSegment = void 0;
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var line_1 = require("./line");
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var util_1 = require("./util");
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function analyzePoints(points) {
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// 计算每段的长度和总的长度
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var totalLength = 0;
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var segments = [];
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for (var i = 0; i < points.length - 1; i++) {
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var from = points[i];
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var to = points[i + 1];
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var length_1 = util_1.distance(from[0], from[1], to[0], to[1]);
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var seg = {
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from: from,
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to: to,
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length: length_1,
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};
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segments.push(seg);
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totalLength += length_1;
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}
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return { segments: segments, totalLength: totalLength };
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}
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function lengthOfSegment(points) {
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if (points.length < 2) {
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return 0;
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}
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var totalLength = 0;
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for (var i = 0; i < points.length - 1; i++) {
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var from = points[i];
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var to = points[i + 1];
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totalLength += util_1.distance(from[0], from[1], to[0], to[1]);
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}
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return totalLength;
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}
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exports.lengthOfSegment = lengthOfSegment;
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/**
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* 按照比例在数据片段中获取点
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* @param {array} points 点的集合
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* @param {number} t 百分比 0-1
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* @return {object} 点的坐标
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*/
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function pointAtSegments(points, t) {
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// 边界判断
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if (t > 1 || t < 0 || points.length < 2) {
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return null;
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}
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var _a = analyzePoints(points), segments = _a.segments, totalLength = _a.totalLength;
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// 多个点有可能重合
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if (totalLength === 0) {
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return {
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x: points[0][0],
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y: points[0][1],
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};
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}
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// 计算比例
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var startRatio = 0;
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var point = null;
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for (var i = 0; i < segments.length; i++) {
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var seg = segments[i];
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var from = seg.from, to = seg.to;
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var currentRatio = seg.length / totalLength;
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if (t >= startRatio && t <= startRatio + currentRatio) {
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var localRatio = (t - startRatio) / currentRatio;
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point = line_1.default.pointAt(from[0], from[1], to[0], to[1], localRatio);
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break;
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}
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startRatio += currentRatio;
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}
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return point;
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}
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exports.pointAtSegments = pointAtSegments;
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/**
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* 按照比例在数据片段中获取切线的角度
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* @param {array} points 点的集合
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* @param {number} t 百分比 0-1
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*/
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function angleAtSegments(points, t) {
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// 边界判断
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if (t > 1 || t < 0 || points.length < 2) {
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return 0;
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}
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var _a = analyzePoints(points), segments = _a.segments, totalLength = _a.totalLength;
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// 计算比例
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var startRatio = 0;
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var angle = 0;
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for (var i = 0; i < segments.length; i++) {
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var seg = segments[i];
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var from = seg.from, to = seg.to;
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var currentRatio = seg.length / totalLength;
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if (t >= startRatio && t <= startRatio + currentRatio) {
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angle = Math.atan2(to[1] - from[1], to[0] - from[0]);
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break;
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}
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startRatio += currentRatio;
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}
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return angle;
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}
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exports.angleAtSegments = angleAtSegments;
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function distanceAtSegment(points, x, y) {
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var minDistance = Infinity;
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for (var i = 0; i < points.length - 1; i++) {
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var point = points[i];
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var nextPoint = points[i + 1];
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var distance_1 = line_1.default.pointDistance(point[0], point[1], nextPoint[0], nextPoint[1], x, y);
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if (distance_1 < minDistance) {
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minDistance = distance_1;
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}
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}
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return minDistance;
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}
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exports.distanceAtSegment = distanceAtSegment;
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//# sourceMappingURL=segments.js.map
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