openlayers+vue绘制水流——流动的虚线
openlayers+vue绘制流动虚线的原理openlayers绘制流动的虚线和canvas绘制流动虚线原理类似,利用linedash属性绘制一组线段和间距交替的虚线,然后利用偏移量,利用定时器循环,最后就可以实现水流效果;话不多说直接上代码<template><div id="box"><div id="map"></div></div&g
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openlayers+vue绘制流动虚线的原理
openlayers绘制流动的虚线和canvas绘制流动虚线原理类似,利用linedash属性绘制一组线段和间距交替的虚线,然后利用偏移量,利用定时器循环,最后就可以实现水流效果;
话不多说直接上代码
<template>
<div id="box">
<div id="map"></div>
</div>
</template>
<script>
import Map from "ol/Map";
import View from "ol/View";
import { Stroke, Style } from "ol/style";
import { LineString } from "ol/geom";
import { OSM, Vector as VectorSource } from "ol/source";
import { Tile as TileLayer, Vector as VectorLayer } from "ol/layer";
import Feature from 'ol/Feature';
import GeoJSON from "ol/format/GeoJSON";
export default {
mounted() {
var map = new Map({
target: "map",
layers: [
new TileLayer({
source: new OSM()
})
],
view: new View({
center: [125.346473,43.89179],
zoom: 1,
projection:'EPSG:4326'
})
});
var style=new Style({
stroke:new Stroke({
color:'#EAE911',
width:20
})
});
var newSource=new VectorSource({//第一个直线数据,外部获取的geojson文件,文件的数据就是.geojson路径的数据
url:'./static/管道路径.geojson',
format: new GeoJSON()
})
var newVector=new VectorLayer({
source:newSource
})
//第二个直线数据,手动添加的位置数据
var line=new LineString([[125.346473,43.89179],[116.617835,39.981154],[124.368689,40.115714]])
var source=new VectorSource({
wrapX:false
})
var outlineStroke=new Style({
stroke:new Stroke({
color:[25,25,255,1],
width:5
})
})
function getAnimationStrokeStyle(){
return new Style({
stroke:new Stroke({
color:[204,204,255,1],
widht:5,
lineDash:[2,7],//一组线段和间距交互的数组,可以控制虚线的长度
lineDashOffset:feature.get('dashOffset')//偏移量,控制虚线的速度和方向
})
})
}
//手动添加数据的矢量数据
var feature = new Feature({
geometry: line,
finished: false,
dashOffset:-8
});
function getStyle(){
return[outlineStroke,getAnimationStrokeStyle()]
}
var array=[]
feature.setStyle(getStyle())
source.addFeature(feature)
var flightsLayer=new VectorLayer({
source:source,
style:style
});
map.addLayer(flightsLayer)
map.addLayer(newVector)
setInterval(() => {
let offset1=feature.get('dashOffset')
offset1=(offset1==0?-8:offset1+1)
feature.set('dashOffset',offset1)
feature.setStyle(getStyle())
}, 100);
newVector.getSource().on('addfeature',function(event){
array.push(event.feature)
for(let i=0;i<array.length;i++){
array[i].setStyle(getStyle())
array[i].set('dashOffset',0)
setInterval(() => {
let offset=array[i].get('dashOffset')
offset=(offset==8?0:offset+1)
array[i].set('dashOffset',offset)
array[i].setStyle(getStyle())
}, 100);
}
})
}
};
</script>
<style scoped>
#box{
width: 100%;
margin: 0 auto;
height: calc(100% - 40px);
}
#map{
width: 99%;
height: calc(100% - 40px);
position: absolute ;}
</style>
效果如图所示:
openlayers绘制虚线总结
上面的代码是绘制两段流动的虚线,一段是从.geojson文件获取的数据路径,数据的内容就是geojson文件绘制路径的数据,另一段是自己手动添加的路径,
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