openlayers学习之-----把坐标点改为WKT格式的数据

什么是WKT？

WKT(Well-known text)是一种文本标记语言，用于表示矢量几何对象、空间参照系统及空间参照系统之间的转换。

需求是：input输入这种格式坐标-------“116.421516,39.958751”

　　　　给后台传WKT格式的数据

在此之前先安装openlayers，别忘了：cnpm install ol

代码：

<template>
    <div>
        <h5>坐标点=>WKT格式：</h5>
        <el-input v-model="inputValue" @change="pointToWKT"></el-input>
        <span>{{inputValueWKT}}</span>
    </div>
</template>

<script>
    import {
        WKT
    } from "ol/format";
    import {
        Point as GeomPoint,
    } from "ol/geom";
    import {
        transform as ProjTransform
    } from "ol/proj";
    export default {
        data() {
            this.format = new WKT();
            return {
                inputValue: '',
                inputValueWKT:''
            }
        },
        mounted() {

        },
        methods: {
            pointToWKT(point) {
                point = point.split(",")
                point = point.map(item => {
                    return Number(item);
                });
                point = ProjTransform(point, "EPSG:4326", "EPSG:3857");
                point = new GeomPoint(point)
                point = this.format.writeGeometry(point, {
                    dataProjection: "EPSG:4326",
                    featureProjection: "EPSG:3857"
                });
                this.inputValueWKT = point
            }
        }
    }
</script>

<style scoped>

</style>

效果：