拆分多边形为点(explode)

> npm install @turf/explode

Takes a feature or set of features and returns all positions as points. 获取任意要素(Feature)或要素集（FeatureCollection），返回所有要素的顶点。

参数

参数	类型	描述
geojson	GeoJSON	要素或要素集

返回

FeatureCollection <point> - points representing the exploded input features

FeatureCollection <point> - 所有要素的点集合

示例

var polygon = turf.polygon([
  [
    [-81, 41],
    [-88, 36],
    [-84, 31],
    [-80, 33],
    [-77, 39],
    [-81, 41],
  ],
]);

var explode = turf.explode(polygon); // 返回六个顶点的要素集

基础用法

打开 几何：

<template>
  <base-map>
    <a-button
      type="primary"
      @click="
        () => {
          visible = true;
        }
      "
      >打开</a-button
    >
    <drawer :visible.sync="visible" :code="code">
      <a-row
        ><a-space
          >几何：<geojson-text
            :type.sync="type1"
            @change="handleChange"
          ></geojson-text></a-space
      ></a-row>
      <a-row> <json :data="result"></json> </a-row>
    </drawer>
    <vue2ol-layer-vector>
      <vue2ol-source-vector :features="features1"> </vue2ol-source-vector>
    </vue2ol-layer-vector>
    <vue2ol-layer-vector :style-obj="styleRed">
      <vue2ol-source-vector :features="features"> </vue2ol-source-vector>
    </vue2ol-layer-vector>
  </base-map>
</template>
<script>
import * as turf from "@turf/turf";
import { getTestOL, getTestTurf, getTestFeatures } from "../../utils/index.js";
import { getFeaturesFromTurf, styleRed } from "../../utils/index.js";

export default {
  data() {
    return {
      result: null,
      visible: true,
      type1: "Polygon",
      styleRed,
      turfObj1: null,
      features1: [],
      features: [],
    };
  },
  computed: {
    code() {
      return `let value = turf.explode(${JSON.stringify(this.turfObj1)});`;
    },
  },
  watch: {
    turfObj1() {
      this.init();
    },
  },
  methods: {
    init() {
      if (!this.turfObj1) {
        return;
      }
      try {
        this.result = null;
        this.features = [];

        this.result = turf.explode(this.turfObj1);
        this.features = getFeaturesFromTurf(this.result);
      } catch (e) {
        this.result = {
          error: e.toString(),
        };
      }
    },
    handleChange(obj) {
      this.turfObj1 = obj;
      this.features1 = getFeaturesFromTurf(this.turfObj1);
    },
  },
};
</script>

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