openlayers 绘图功能，编辑多边形，modify组件的使用（四）

本文主要是介绍openlayers 绘图功能，编辑多边形，modify组件的使用（四），希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

本篇使用vue3-openlayers介绍一下编辑工具 modify

1 需求

使用 openlayers 绘图功能绘制多边形,绘制完成后可进行编辑

2 分析

主要是 openlayers 中 draw，modify 功能的使用

3 实现

<template><ol-map:loadTilesWhileAnimating="true":loadTilesWhileInteracting="true"style="width: 100%; height: 100%"ref="mapRef"><ol-viewref="view":center="center":rotation="rotation":zoom="zoom":projection="projection"/><ol-vector-layer><ol-source-vector :projection="projection" :features="features"><ol-interaction-draw:type="'Polygon'":source="source"@drawend="drawend"@drawstart="drawstart"><ol-style :overrideStyleFunction="handleStyleFunction"></ol-style></ol-interaction-draw><ol-interaction-modify:pixelTolerance="10":insertVertexCondition="handleInsertVertexCondition"@modifyend="handleModifyEnd"><ol-style :overrideStyleFunction="handleModifyStyleFunction"></ol-style></ol-interaction-modify></ol-source-vector><ol-style :overrideStyleFunction="styleFunction"></ol-style></ol-vector-layer></ol-map>
</template><script setup lang="ts">
import { FeatureLike } from 'ol/Feature';
import { LineString, Point } from 'ol/geom';
import { DrawEvent } from 'ol/interaction/Draw';
import { Circle, Fill, Stroke, Style } from 'ol/style';
const center = ref([121, 31]);
const projection = ref('EPSG:4326');
const zoom = ref(5);
const rotation = ref(0);
const features = ref([]);
const source = ref([]);
const mapRef=ref();const drawstart = (event: Event) => {console.log(event);
};const drawend = (event: DrawEvent) => {console.log(event.feature.getGeometry());
};const handleStyleFunction = (feature: FeatureLike, currentStyle: Style) => {const geometry = feature.getGeometry();const coord = geometry.getCoordinates();const type = geometry.getType();const styles: Array<Style> = [];for (let i = 0; i < coord.length - 1; i++) {styles.push(new Style({geometry: new Point(coord[i]),image: new Circle({fill: new Fill({ color: [255, 255, 255, 1] }),stroke: new Stroke({color: 'rgba(228, 147, 87, 1)',width: 2}),radius: 4})}));}if (type === 'LineString') {for (let i = 0; i < coord.length - 1; i++) {styles.push(new Style({geometry: new LineString([coord[i], coord[i + 1]]),stroke: new Stroke({color: 'orange',lineDash: coord.length > 2 && i < coord.length - 2 ? [] : [10],width: 2})}));}}return styles;
};const handleInsertVertexCondition =(e)=>{return false;
}const handleModifyStyleFunction = (feature: FeatureLike, currentStyle: Style) => {const coord = feature.getGeometry().getCoordinates();const layer = mapRef.value.map.getLayers().item(0);const features = layer.getSource().getFeatures();const coords = features.map(feature => feature.getGeometry().getCoordinates()).flat(2);let style = undefined;// 只有鼠标在顶点时才能触发编辑功能if (coords.find(c => c.toString() === coord.toString())) {style = new Style({geometry: new Point(coord),image: new Circle({radius: 6,fill: new Fill({color: '#ffff'}),stroke: new Stroke({color: 'red',width: 2})})});}return style;
};const handleModifyEnd=(e)=>{features.value.push(e.feature);//这里可以把编辑后的feature添加到layer绑定的features中e.features.forEach(feature => {console.log(feature.getGeometry().getCoordinates());//获取所有坐标});
}const styleFunction = (feature: FeatureLike, currentStyle: Style) => {const styles = [];const coord = feature.getGeometry().getCoordinates();for (let i = 0; i < coord[0].length - 1; i++) {styles.push(new Style({geometry: new Point(coord[0][i]),image: new Circle({radius: 4,fill: new Fill({color: '#ffff'}),stroke: new Stroke({color: 'orange',width: 2})})}));}styles.push(new Style({fill: new Fill({color: [128, 128, 255, 0.5]}),stroke: new Stroke({color: 'blue',width: 2})}));return styles;
};
</script>
<style scoped lang="scss"></style>```![](https://img-blog.csdnimg.cn/direct/423a30bfe6c9461fb9f174494883c499.gif#pic_center)