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Co-Authored-By: 狸花猫/Claude-Qwen3.6-Plus 🐾
103 lines
2.9 KiB
JavaScript
103 lines
2.9 KiB
JavaScript
import isPointInPolygon from './point-in-polygon';
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import getLineIntersect from './get-line-intersect';
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import { each } from '@antv/util';
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function parseToLines(points) {
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var lines = [];
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var count = points.length;
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for (var i = 0; i < count - 1; i++) {
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var point = points[i];
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var next = points[i + 1];
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lines.push({
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from: {
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x: point[0],
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y: point[1]
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},
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to: {
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x: next[0],
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y: next[1]
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}
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});
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}
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if (lines.length > 1) {
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var first = points[0];
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var last = points[count - 1];
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lines.push({
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from: {
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x: last[0],
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y: last[1]
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},
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to: {
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x: first[0],
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y: first[1]
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}
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});
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}
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return lines;
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}
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function lineIntersectPolygon(lines, line) {
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var isIntersect = false;
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each(lines, function (l) {
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if (getLineIntersect(l.from, l.to, line.from, line.to)) {
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isIntersect = true;
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return false;
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}
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});
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return isIntersect;
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}
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function getBBox(points) {
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var xArr = points.map(function (p) { return p[0]; });
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var yArr = points.map(function (p) { return p[1]; });
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return {
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minX: Math.min.apply(null, xArr),
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maxX: Math.max.apply(null, xArr),
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minY: Math.min.apply(null, yArr),
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maxY: Math.max.apply(null, yArr)
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};
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}
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function intersectBBox(box1, box2) {
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return !(box2.minX > box1.maxX || box2.maxX < box1.minX || box2.minY > box1.maxY || box2.maxY < box1.minY);
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}
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export default function isPolygonsIntersect(points1, points2) {
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// 空数组，或者一个点返回 false
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if (points1.length < 2 || points2.length < 2) {
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return false;
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}
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var bbox1 = getBBox(points1);
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var bbox2 = getBBox(points2);
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// 判定包围盒是否相交，比判定点是否在多边形内要快的多，可以筛选掉大多数情况
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if (!intersectBBox(bbox1, bbox2)) {
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return false;
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}
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var isIn = false;
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// 判定点是否在多边形内部，一旦有一个点在另一个多边形内，则返回
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each(points2, function (point) {
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if (isPointInPolygon(points1, point[0], point[1])) {
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isIn = true;
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return false;
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}
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});
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if (isIn) {
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return true;
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}
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// 两个多边形都需要判定
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each(points1, function (point) {
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if (isPointInPolygon(points2, point[0], point[1])) {
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isIn = true;
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return false;
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}
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});
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if (isIn) {
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return true;
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}
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var lines1 = parseToLines(points1);
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var lines2 = parseToLines(points2);
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var isIntersect = false;
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each(lines2, function (line) {
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if (lineIntersectPolygon(lines1, line)) {
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isIntersect = true;
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return false;
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}
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});
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return isIntersect;
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}
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//# sourceMappingURL=is-polygons-intersect.js.map
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