vue openlayers 实现自定义绘图控件实现类似ArcGIS绘图工具条
时间: 2023-09-08 21:11:59 浏览: 81
要实现类似ArcGIS绘图工具条,可以考虑使用`ol.control.Control`和`ol.interaction.Interaction`来自定义绘图控件。
首先,需要在Vue项目中引入OpenLayers库。可以通过npm安装ol和@types/ol,然后在Vue组件中引入:
```javascript
import 'ol/ol.css';
import Map from 'ol/Map';
import View from 'ol/View';
import TileLayer from 'ol/layer/Tile';
import OSM from 'ol/source/OSM';
import {Draw, Modify, Snap} from 'ol/interaction';
import {Circle as CircleStyle, Fill, Stroke, Style} from 'ol/style';
import {Vector as VectorLayer} from 'ol/layer';
import {Vector as VectorSource} from 'ol/source';
import {LineString, Polygon, Circle} from 'ol/geom';
import Control from 'ol/control/Control';
```
然后,在Vue组件中添加一个`div`作为地图容器,并在`mounted`生命周期中初始化地图:
```html
<template>
<div class="map-container" ref="map"></div>
</template>
<script>
export default {
mounted() {
const map = new Map({
target: this.$refs.map,
layers: [
new TileLayer({
source: new OSM()
})
],
view: new View({
center: [0, 0],
zoom: 2
})
});
// 在这里添加绘图控件和交互
}
}
</script>
<style>
.map-container {
height: 500px;
}
</style>
```
接下来,可以定义一个继承自`ol.control.Control`的自定义控件类,用于显示绘图工具条:
```javascript
class DrawControl extends Control {
constructor(options) {
const element = document.createElement('div');
element.className = 'draw-control ol-unselectable ol-control';
element.innerHTML = `
<button class="draw-button" data-type="Point">绘制点</button>
<button class="draw-button" data-type="LineString">绘制线</button>
<button class="draw-button" data-type="Polygon">绘制多边形</button>
<button class="draw-button" data-type="Circle">绘制圆</button>
<button class="draw-button" data-type="Clear">清除</button>
`;
super({
element,
target: options.target
});
// 添加事件监听
element.addEventListener('click', this.handleButtonClick.bind(this));
}
handleButtonClick(event) {
const type = event.target.getAttribute('data-type');
const map = this.getMap();
const source = new VectorSource();
const layer = new VectorLayer({
source,
style: new Style({
fill: new Fill({
color: 'rgba(255, 255, 255, 0.2)'
}),
stroke: new Stroke({
color: '#ffcc33',
width: 2
}),
image: new CircleStyle({
radius: 7,
fill: new Fill({
color: '#ffcc33'
})
})
})
});
switch (type) {
case 'Point':
map.addInteraction(new Draw({
source,
type: 'Point'
}));
break;
case 'LineString':
map.addInteraction(new Draw({
source,
type: 'LineString'
}));
break;
case 'Polygon':
map.addInteraction(new Draw({
source,
type: 'Polygon'
}));
break;
case 'Circle':
map.addInteraction(new Draw({
source,
type: 'Circle'
}));
break;
case 'Clear':
map.getInteractions().forEach(interaction => {
if (interaction instanceof Draw) {
map.removeInteraction(interaction);
}
});
source.clear();
break;
}
if (type !== 'Clear') {
map.addLayer(layer);
map.addInteraction(new Modify({
source
}));
map.addInteraction(new Snap({
source
}));
}
}
}
```
这个自定义控件类继承自`ol.control.Control`,在构造函数中创建一个包含绘图按钮的`div`元素,并添加点击事件监听。在点击事件处理函数中,根据按钮的`data-type`属性选择对应的交互类型,如`Point`、`LineString`、`Polygon`和`Circle`,然后添加到地图中,并创建一个`VectorLayer`用于显示绘制的要素。同时,添加`Modify`和`Snap`交互用于编辑和捕捉要素。
最后,在Vue组件的`mounted`生命周期中添加绘图控件:
```javascript
mounted() {
const map = new Map({
target: this.$refs.map,
layers: [
new TileLayer({
source: new OSM()
})
],
view: new View({
center: [0, 0],
zoom: 2
})
});
const drawControl = new DrawControl({
target: document.querySelector('.ol-overlaycontainer')
});
map.addControl(drawControl);
}
```
这里创建一个`DrawControl`实例,并将其添加到地图中。注意,`DrawControl`的`target`属性需要设置为`.ol-overlaycontainer`,这样才能将工具条添加到地图上方,避免被覆盖。
现在,就可以在Vue项目中使用自定义绘图控件,实现类似ArcGIS绘图工具条的功能了。
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