计算边界多边形(bboxPolygon)

> npm install @turf/bbox-polygon

Takes a bbox and returns an equivalent polygon.

传入一个bbox并返回一个等价的Feature<Polygon>。

参数

参数	类型	描述
bbox	bbox	边界框
options	Object	可配置项

options 选项

属性	类型	默认值	描述
properties	Properties	{}	返回 GeoJSON 的 properties 属性对象
id	string|number	{}	返回 GeoJSON 的 id

返回

Feature<Polygon> - a Polygon representation of the bounding box

Feature<Polygon> - 表示边界框的多边形要素

示例

var bbox = [0, 0, 10, 10];

var poly = turf.bboxPolygon(bbox);
/*
{
  type: "Feature",
  geometry: {
    type: "Polygon",
    coordinates: [
      [0, 0], [10, 0], [10, 10], [0, 10], [0, 0]
    ]
  },
  properties: {}
}
*/

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> {{ result }} </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 {
      visible: true,
      result: null,
      type1: "LineString",
      features: [],
      styleRed,
      turfObj1: null,
      features1: [],
    };
  },
  computed: {
    code() {
      let extent = turf.bbox(this.turfObj1);
      return `let result = turf.bboxPolygon(${JSON.stringify(extent)});`;
    },
  },
  watch: {
    turfObj1() {
      this.init();
    },
  },
  methods: {
    init() {
      if (!this.turfObj1) {
        return;
      }
      try {
        this.features = [];
        this.result = null;
        let bbox = turf.bbox(this.turfObj1);
        this.result = turf.bboxPolygon(bbox);
        this.features = getFeaturesFromTurf(this.result);
      } catch (e) {
        this.result = {
          error: e.toString(),
        };
      }
    },
    handleChange(obj) {
      this.turfObj1 = obj;
      this.features1 = getFeaturesFromTurf(this.turfObj1);
    },
  },
};
</script>

Expand Copy Copy

动态绘制

打开 点 线 面

<template>
  <base-map>
    <a-button
      type="primary"
      @click="
        () => {
          visible = true;
        }
      "
      >打开</a-button
    >
    <drawer :visible.sync="visible" :code="code">
      <a-row
        ><select v-model="type">
          <option value="Point">点</option>
          <option value="LineString">线</option>
          <option value="Polygon">面</option>
        </select></a-row
      >
      <a-row> <json :data="result"></json></a-row>
    </drawer>
    <vue2ol-layer-vector>
      <vue2ol-source-vector>
        <vue2ol-interaction-draw
          :active="true"
          :type="type"
          @drawend="handleDrawEnd"
        ></vue2ol-interaction-draw>
      </vue2ol-source-vector>
    </vue2ol-layer-vector>
    <vue2ol-layer-vector>
      <vue2ol-source-vector>
        <vue2ol-feature v-if="bboxGeometry" :geometry="bboxGeometry">
        </vue2ol-feature>
      </vue2ol-source-vector>
    </vue2ol-layer-vector>
  </base-map>
</template>
<script>
import * as turf from "@turf/turf";
import { GeoJSON } from "ol/format";
export default {
  data() {
    return {
      extent: null,
      geometry: null,
      type: "LineString",
      bboxGeometry: null,
      visible: true,
      result: null,
    };
  },
  watch: {
    geometry() {
      this.init();
    },
  },
  computed: {
    code() {
      if (!this.geometry) {
        return;
      }
      let extent = turf.bbox(
        JSON.parse(new GeoJSON().writeGeometry(this.geometry))
      );
      return `let extent = ${JSON.stringify(extent)};
let bboxPolygon = turf.bboxPolygon(extent);`;
    },
  },
  mounted() {},
  methods: {
    handleDrawEnd(e) {
      this.geometry = e.feature.getGeometry();
    },
    init() {
      if (!this.geometry) {
        return;
      }
      let value = turf.bbox(
        JSON.parse(new GeoJSON().writeGeometry(this.geometry))
      );
      this.extent = value;

      this.result = turf.bboxPolygon(this.extent);

      this.bboxGeometry = new GeoJSON().readGeometry(
        JSON.stringify(this.result.geometry)
      );
    },
  },
};
</script>

Expand Copy Copy