本文基于《基于Webpack的Cesium+Vue应用》文章，在此基础之上，进行功能的扩展。本文主要讲解如何在Cesium三维球上用鼠标绘制点、线、面、矩形。
1、搭建项目结构
image.png
2、MainViewer.vue代码
<template>
<div id="mainDiv">
<div id="cesiumContainer">
<CesiumViewer v-if="viewer" :viewer="viewer"></CesiumViewer>
</div>
</div>
</template>
<script>
import Cesium from 'cesium/Source/Cesium.js'
import buildModuleUrl from "cesium/Source/Core/buildModuleUrl"
import "cesium/Source/Widgets/widgets.css";
import CesiumViewer from './CesiumViewer.vue'
export default {
name: 'MainViewer',
components:{CesiumViewer},
data () {
return {
viewer:''
}
},
mounted:function(){
//设置静态资源目录
buildModuleUrl.setBaseUrl('../../static/Cesium/');
//创建viewer实例
this.viewer = new Cesium.Viewer('cesiumContainer',{
animation: false,
baseLayerPicker: false,
fullscreenButton: false,
geocoder: false,
homeButton: false,
sceneModePicker: false,
selectionIndicator: false,
timeline: false,
navigationHelpButton: false,
infoBox: false,
navigationInstructionsInitiallyVisible: false
});
this.viewer._cesiumWidget._creditContainer.style.display = "none"; //去掉logo
}
}
</script>
<style scoped>
#mainDiv{
width:100%;
height:100%;
}
#cesiumContainer{
width:100%;
height:100%;
}
</style>
3、CesiumViewer.vue代码
<template>
<div id="cesiumDiv">
<div id="tools">
<el-button id="pointBtn">画点</el-button>
<el-button id="lineBtn">画线</el-button>
<el-button id="polyBtn">画面</el-button>
<el-button id="rectBtn">画矩形</el-button>
<el-button id="clearBtn">清除</el-button>
</div>
</div>
</template>
<script>
import Cesium from 'cesium/Source/Cesium.js'
import $ from 'jquery'
export default {
name: 'CesiumViewer',
props:['viewer'],
data () {
return {
removeImageryLayers:[]
}
},
mounted:function(){
var _this = this;
$("#pointBtn").bind('click',function(){
_this.drawPoint(function(positions){
var wgs84_positions = [];
for(var i=0; i<positions.length; i++){
var wgs84_point = _this.Cartesian3_to_WGS84({
x: positions[i].x,
y: positions[i].y,
z: positions[i].z
});
wgs84_positions.push(wgs84_point);
}
console.log(wgs84_positions);
});
});
$("#lineBtn").bind('click',function(){
_this.drawLineString(function(positions){
var wgs84_positions = [];
for(var i=0; i<positions.length; i++){
var wgs84_point = _this.Cartesian3_to_WGS84({
x: positions[i].x,
y: positions[i].y,
z: positions[i].z
});
wgs84_positions.push(wgs84_point);
}
console.log(wgs84_positions);
});
});
$("#polyBtn").bind('click',function(){
_this.drawPolygon(function(positions){
var wgs84_positions = [];
for(var i=0; i<positions.length; i++){
var wgs84_point = _this.Cartesian3_to_WGS84({
x: positions[i].x,
y: positions[i].y,
z: positions[i].z
});
wgs84_positions.push(wgs84_point);
}
console.log(wgs84_positions);
});
});
$("#rectBtn").bind('click',function(){
_this.drawRect(function(positions){
var wgs84_positions = [];
for(var i=0; i<positions.length; i++){
var wgs84_point = _this.Cartesian3_to_WGS84({
x: positions[i].x,
y: positions[i].y,
z: positions[i].z
});
wgs84_positions.push(wgs84_point);
}
console.log(wgs84_positions);
});
});
$("#clearBtn").bind('click',function(){
_this.clearHandle();
});
},
methods:{
//画点
drawPoint:function(callback){
var _this = this;
//坐标存储
var positions = [];
var handler = new Cesium.ScreenSpaceEventHandler(_this.viewer.scene.canvas);
//单击鼠标左键画点
handler.setInputAction(function (movement) {
var cartesian = _this.viewer.scene.camera.pickEllipsoid(movement.position, _this.viewer.scene.globe.ellipsoid);
positions.push(cartesian);
_this.viewer.entities.add({
position: cartesian,
point: {
color: Cesium.Color.RED,
pixelSize: 5,
heightReference: Cesium.HeightReference.CLAMP_TO_GROUND
}
});
}, Cesium.ScreenSpaceEventType.LEFT_CLICK);
//单击鼠标右键结束画点
handler.setInputAction(function (movement) {
handler.destroy();
callback(positions);
}, Cesium.ScreenSpaceEventType.RIGHT_CLICK);
},
//画线
drawLineString:function(callback){
var _this = this;
var PolyLinePrimitive = (function () {
function _(positions) {
this.options = {
polyline: {
show: true,
positions: [],
material: Cesium.Color.RED,
width:3
}
};
this.positions = positions;
this._init();
}
_.prototype._init = function () {
var _self = this;
var _update = function () {
return _self.positions;
};
//实时更新polyline.positions
this.options.polyline.positions = new Cesium.CallbackProperty(_update, false);
_this.viewer.entities.add(this.options);
};
return _;
})();
var handler = new Cesium.ScreenSpaceEventHandler(_this.viewer.scene.canvas);
var positions = [];
var poly = undefined;
//鼠标左键单击画点
handler.setInputAction(function (movement) {
var cartesian = _this.viewer.scene.camera.pickEllipsoid(movement.position, _this.viewer.scene.globe.ellipsoid);
if (positions.length == 0) {
positions.push(cartesian.clone());
}
positions.push(cartesian);
}, Cesium.ScreenSpaceEventType.LEFT_CLICK);
//鼠标移动
handler.setInputAction(function (movement) {
var cartesian = _this.viewer.scene.camera.pickEllipsoid(movement.endPosition, _this.viewer.scene.globe.ellipsoid);
if (positions.length >= 2) {
if (!Cesium.defined(poly)) {
poly = new PolyLinePrimitive(positions);
} else {
positions.pop();
cartesian.y += (1 + Math.random());
positions.push(cartesian);
}
}
}, Cesium.ScreenSpaceEventType.MOUSE_MOVE);
//单击鼠标右键结束画线
handler.setInputAction(function (movement) {
handler.destroy();
callback(positions);
}, Cesium.ScreenSpaceEventType.RIGHT_CLICK);
},
//画面
drawPolygon:function(callback){
var _this = this;
var PolygonPrimitive = (function () {
function _(positions) {
this.options = {
name: '多边形',
polygon: {
hierarchy: [],
perPositionHeight: true,
material: Cesium.Color.RED.withAlpha(0.4)
}
};
this.hierarchy = positions;
this._init();
}
_.prototype._init = function () {
var _self = this;
var _update = function () {
return _self.hierarchy;
};
//实时更新polygon.hierarchy
this.options.polygon.hierarchy = new Cesium.CallbackProperty(_update, false);
_this.viewer.entities.add(this.options);
};
return _;
})();
var handler = new Cesium.ScreenSpaceEventHandler(_this.viewer.scene.canvas);
var positions = [];
var poly = undefined;
//鼠标单击画点
handler.setInputAction(function (movement) {
var cartesian = _this.viewer.scene.camera.pickEllipsoid(movement.position, _this.viewer.scene.globe.ellipsoid);
if (positions.length == 0) {
positions.push(cartesian.clone());
}
positions.push(cartesian);
}, Cesium.ScreenSpaceEventType.LEFT_CLICK);
//鼠标移动
handler.setInputAction(function (movement) {
var cartesian = _this.viewer.scene.camera.pickEllipsoid(movement.endPosition, _this.viewer.scene.globe.ellipsoid);
if (positions.length >= 2) {
if (!Cesium.defined(poly)) {
poly = new PolygonPrimitive(positions);
} else {
positions.pop();
cartesian.y += (1 + Math.random());
positions.push(cartesian);
}
}
}, Cesium.ScreenSpaceEventType.MOUSE_MOVE);
//鼠标右键单击结束绘制
handler.setInputAction(function (movement) {
handler.destroy();
callback(positions);
}, Cesium.ScreenSpaceEventType.RIGHT_CLICK);
},
//画矩形
drawRect:function(callback){
let _self = this;
let pointsArr = [];
_self.shape= {
points:[],
rect:null,
entity:null
};
var tempPosition;
var handle = new Cesium.ScreenSpaceEventHandler(_self.viewer.scene.canvas);
//鼠标左键单击画点
handle.setInputAction(function(click){
tempPosition = _self.getPointFromWindowPoint(click.position);
//选择的点在球面上
if(tempPosition){
if(_self.shape.points.length==0) {
pointsArr.push(tempPosition);
_self.shape.points.push(_self.viewer.scene.globe.ellipsoid.cartesianToCartographic(tempPosition));
_self.shape.rect=Cesium.Rectangle.fromCartographicArray(_self.shape.points);
_self.shape.rect.east+=0.000001;
_self.shape.rect.north+=0.000001;
_self.shape.entity= _self.viewer.entities.add({
rectangle : {
coordinates :_self.shape.rect,
material : Cesium.Color.BLACK.withAlpha(0.4),
outline : true,
outlineWidth: 2,
outlineColor : Cesium.Color.RED,
height:0
}
});
_self.bufferEntity = _self.shape.entity;
}
else{
handle.removeInputAction(Cesium.ScreenSpaceEventType.MOUSE_MOVE);
handle.removeInputAction(Cesium.ScreenSpaceEventType.LEFT_CLICK);
callback(pointsArr);
}
}
},Cesium.ScreenSpaceEventType.LEFT_CLICK);
//鼠标移动
handle.setInputAction(function(movement){
if(_self.shape.points.length==0){
return;
}
var moveEndPosition = _self.getPointFromWindowPoint(movement.endPosition);
//选择的点在球面上
if(moveEndPosition){
pointsArr[1] = moveEndPosition;
_self.shape.points[1]=_self.viewer.scene.globe.ellipsoid.cartesianToCartographic(moveEndPosition);
_self.shape.rect= Cesium.Rectangle.fromCartographicArray(_self.shape.points);
if(_self.shape.rect.west==_self.shape.rect.east)
_self.shape.rect.east+=0.000001;
if(_self.shape.rect.south==_self.shape.rect.north)
_self.shape.rect.north+=0.000001;
_self.shape.entity.rectangle.coordinates = _self.shape.rect;
}
},Cesium.ScreenSpaceEventType.MOUSE_MOVE);
},
//清除所有Entity和ImageryLayers
clearHandle: function () {
//移除所有实体Entity
this.viewer.entities.removeAll();
//移除cesium加载的ImageryLayer
for(var i=0; i<this.removeImageryLayers.length; i++){
this.viewer.imageryLayers.remove(this.removeImageryLayers[i]);
}
},
getPointFromWindowPoint(point){
if(this.viewer.scene.terrainProvider.constructor.name=="EllipsoidTerrainProvider") {
return this.viewer.camera.pickEllipsoid(point,this.viewer.scene.globe.ellipsoid);
} else {
var ray=this.viewer.scene.camera.getPickRay(point);
return this.viewer.scene.globe.pick(ray,this.viewer.scene);
}
},
//笛卡尔坐标系转WGS84坐标系
Cartesian3_to_WGS84: function (point) {
var cartesian33 = new Cesium.Cartesian3(point.x, point.y, point.z);
var cartographic = Cesium.Cartographic.fromCartesian(cartesian33);
var lat = Cesium.Math.toDegrees(cartographic.latitude);
var lng = Cesium.Math.toDegrees(cartographic.longitude);
var alt = cartographic.height;
return {lat: lat, lng: lng, alt: alt};
},
//WGS84坐标系转笛卡尔坐标系
WGS84_to_Cartesian3: function (point) {
var car33 = Cesium.Cartesian3.fromDegrees(point.lng, point.lat, point.alt);
var x = car33.x;
var y = car33.y;
var z = car33.z;
return {x: x, y: y, z: z};
}
}
}
</script>
<style scoped>
#cesiumDiv{
margin:0;
padding:0;
}
</style>
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