最近做Cesium动态绘制，找了一个工具类，在这个基础上完善了一些功能，效果图：
deno如下：完善的内容主要有圆的边框，矩形两种实现方式，注释基本都有写
/**
* @description cesium绘制 点、线、面
* @export
* @class Draw
* @example
* let draw = new Draw(viewer)
* draw.drawCircle();
*/
export default class Draw {
constructor(viewer, config) {
/**cesium实例对象 */
this.viewer = viewer;
// 默认配置
this.config = config || {
// 几何-边框宽度
borderWidth: 2,
// 几何-边框颜色
borderColor: Cesium.Color.WHITE,
lineColor: Cesium.Color.fromCssColorString("#00ffff"),
// 填充材质
material: Cesium.Color.fromCssColorString("#00ffff").withAlpha(0.4)
};
/**存贮绘制的数据 坐标 */
this.infoDetail = { point: [], line: [], rectangle: [], circle: [], planeSelf: [] };
this.handler = new Cesium.ScreenSpaceEventHandler(this.viewer.scene.canvas);
}
/*******
* @function: function
* @return {*}
* @description: 绘制点数据
*/
drawPoint() {
this.handler.destroy();
this.handler = new Cesium.ScreenSpaceEventHandler(this.viewer.scene.canvas);
this.handler.setInputAction((click) => {
/**点击位置笛卡尔坐标 */
let cartesian = this.viewer.camera.pickEllipsoid(click.position, this.viewer.scene.globe.ellipsoid);
/**笛卡尔转弧度坐标 */
let cartographic = Cesium.Cartographic.fromCartesian(cartesian, this.viewer.scene.globe.ellipsoid, new Cesium.Cartographic());
/**点击位置经度 */
let lng = Cesium.Math.toDegrees(cartographic.longitude);
/**点击位置维度 */
let lat = Cesium.Math.toDegrees(cartographic.latitude);
/**实体的唯一标注 */
let id = new Date().getTime();
this.viewer.entities.add({
position: Cesium.Cartesian3.fromDegrees(lng, lat, 0),
name: 'point',
id: id,
point: {
color: this.config.material,
pixelSize: 12,
outlineColor: this.config.borderColor,
outlineWidth: this.config.borderWidth
}
});
this.infoDetail.point.push({ id: id, position: [lng, lat] });
}, Cesium.ScreenSpaceEventType.LEFT_CLICK);
this.handler.setInputAction((click) => {
this.handler.destroy();
}, Cesium.ScreenSpaceEventType.RIGHT_CLICK);
}
/*******
* @function: function
* @description: 绘制矩形区域
* @return {*}
*/
drawRectangle() {
this.handler.destroy();
/**
* 矩形四点坐标
*/
let westSouthEastNorth = [];
/**实体的唯一标注 */
let id = null;
// 矩形绘制类型-- polygon、rectangle
const rectangleType = 'polygon';
/**地图点击对象 */
this.handler = new Cesium.ScreenSpaceEventHandler(this.viewer.scene.canvas);
this.handler.setInputAction((click) => {
/**点击位置笛卡尔坐标 */
let cartesian = this.viewer.camera.pickEllipsoid(click.position, this.viewer.scene.globe.ellipsoid);
/**笛卡尔转弧度坐标 */
let cartographic = Cesium.Cartographic.fromCartesian(cartesian, this.viewer.scene.globe.ellipsoid, new Cesium.Cartographic());
/**点击位置经度 */
let lng1 = Cesium.Math.toDegrees(cartographic.longitude);
/**点击位置维度 */
let lat1 = Cesium.Math.toDegrees(cartographic.latitude);
/**边框坐标 */
westSouthEastNorth = [lng1, lat1];
id = new Date().getTime();
if (westSouthEastNorth) {
this.handler.removeInputAction(Cesium.ScreenSpaceEventType.LEFT_CLICK);
}
// 面实例对象
const rectangleStyle = {
height: 0,
// 填充的颜色，withAlpha透明度
material: this.config.material,
// 是否被提供的材质填充
fill: true,
// 是否显示
show: true,
};
//
let rectangleOptions = {
name: 'rectangle',
id: id,
polyline: {
positions: new Cesium.CallbackProperty(function () { return Cesium.Cartesian3.fromDegreesArray(westSouthEastNorth) }),
material: this.config.borderColor,
width: this.config.borderWidth,
zIndex: 1
}
}
// 根据polygon绘制矩形
if (rectangleType === 'polygon') {
rectangleOptions['polygon'] = {
hierarchy: new Cesium.CallbackProperty(function () {
return {
positions: Cesium.Cartesian3.fromDegreesArray(westSouthEastNorth)
}
}),
...rectangleStyle
};
}
// 根据rectangle绘制矩形
if (rectangleType === 'rectangle') {
rectangleOptions['rectangle'] = {
coordinates: new Cesium.CallbackProperty(function () {
const rectangle = Cesium.Rectangle.fromCartesianArray(Cesium.Cartesian3.fromDegreesArray(westSouthEastNorth));
// 计算矩形四个角的坐标，绘制完成调用，此处为测试
// 西北角弧度坐标（左上）
// const northwest = Cesium.Rectangle.northwest(rectangle);
// 西南角弧度坐标（左下）
// const southwest = Cesium.Rectangle.southwest(rectangle);
// 东北角弧度坐标（右上）
// const northeast = Cesium.Rectangle.northeast(rectangle);
// 东南角弧度坐标（右下）
// const southeast = Cesium.Rectangle.southeast(rectangle);
// console.log(Cesium.Math.toDegrees(northwest.longitude));
// console.log(Cesium.Math.toDegrees(northwest.latitude));
// console.log(northwest.height);
return rectangle;
}, false),
...rectangleStyle
};
}
/**面实例对象 */
let polygons = this.viewer.entities.add(rectangleOptions);
this.handler.setInputAction((move) => {
let cartesian = this.viewer.camera.pickEllipsoid(move.endPosition, this.viewer.scene.globe.ellipsoid);
let cartographic = Cesium.Cartographic.fromCartesian(cartesian, this.viewer.scene.globe.ellipsoid, new Cesium.Cartographic());
let lng = Cesium.Math.toDegrees(cartographic.longitude);
let lat = Cesium.Math.toDegrees(cartographic.latitude);
westSouthEastNorth = [lng1, lat1, lng1, lat, lng, lat, lng, lat1, lng1, lat1];
}, Cesium.ScreenSpaceEventType.MOUSE_MOVE);
}, Cesium.ScreenSpaceEventType.LEFT_CLICK);
this.handler.setInputAction(() => {
this.handler.destroy();
this.infoDetail.rectangle.push({ id: id, position: westSouthEastNorth });
}, Cesium.ScreenSpaceEventType.RIGHT_CLICK);
}
/*******
* @function: function
* @description: 绘制圆形区域
* @return {*}
*/
drawCircle() {
this.handler.destroy();
/**实体的唯一标注 */
let id = null;
/**圆半径 */
let radius = 0;
/**圆心 */
let lngLat = [];
// 圆边界坐标
let boundaryPositions = [];
/**鼠标事件 */
this.handler = new Cesium.ScreenSpaceEventHandler(this.viewer.scene.canvas);
this.handler.setInputAction((click) => {
id = new Date().getTime();
let cartesian = this.viewer.camera.pickEllipsoid(click.position, this.viewer.scene.globe.ellipsoid);
let cartographic = Cesium.Cartographic.fromCartesian(cartesian, this.viewer.scene.globe.ellipsoid, new Cesium.Cartographic());
let lng = Cesium.Math.toDegrees(cartographic.longitude);
let lat = Cesium.Math.toDegrees(cartographic.latitude);
lngLat = [lng, lat];
let entity = this.viewer.entities.add({
position: new Cesium.CallbackProperty(function () { return new Cesium.Cartesian3.fromDegrees(...lngLat, 0) }, false),
name: 'circle',
id: id,
ellipse: {
height: 0,
material: this.config.material
},
polyline: {
width: this.config.borderWidth,
material: this.config.borderColor
}
});
entity.ellipse.semiMajorAxis = new Cesium.CallbackProperty(function () { return radius; }, false);
entity.ellipse.semiMinorAxis = new Cesium.CallbackProperty(function () { return radius; }, false);
entity.polyline.positions = new Cesium.CallbackProperty(function () { return boundaryPositions; }, false);
if (lngLat) {
this.handler.removeInputAction(Cesium.ScreenSpaceEventType.LEFT_CLICK);
}
this.handler.setInputAction((move) => {
boundaryPositions = [];
let cartesian2 = this.viewer.camera.pickEllipsoid(move.endPosition, this.viewer.scene.globe.ellipsoid);
if (Cesium.defined(cartesian2)) {
radius = Cesium.Cartesian3.distance(cartesian, cartesian2);
// 计算几何体圆的轮廓
let circleOutlineGeometryCreate = Cesium.CircleOutlineGeometry.createGeometry(new Cesium.CircleOutlineGeometry({
center: new Cesium.Cartesian3.fromDegrees(...lngLat, 0),
radius: radius || 1,
granularity: 0.01
}));
// 获取几何体圆的边界坐标
let positions = [].slice.call(circleOutlineGeometryCreate.attributes.position.values);
for (let i = 0; i < positions.length; i += 3) {
boundaryPositions.push(new Cesium.Cartesian3(positions[i], positions[i + 1], positions[i + 2]));
}
// 添加第一个点，实现闭合圆
if (boundaryPositions.length !== 0) {
boundaryPositions.push(boundaryPositions[0]);
}
}
}, Cesium.ScreenSpaceEventType.MOUSE_MOVE);
}, Cesium.ScreenSpaceEventType.LEFT_CLICK);
this.handler.setInputAction(() => {
this.infoDetail.circle.push({ id: id, center: lngLat, radius: radius });
this.handler.destroy();
}, Cesium.ScreenSpaceEventType.RIGHT_CLICK);
}
/*******
* @function: function
* @description: 自定义区域绘制
* @return {*}
*/
drawPlane() {
this.handler.destroy();
/**实体的唯一标注 */
let id = new Date().getTime();
/**记录拐点坐标 */
let positions = [],
/**记录返回结果 */
codeInfo = [],
/**面的hierarchy属性 */
polygon = new Cesium.PolygonHierarchy(),
_polygonEntity = new Cesium.Entity(),
/**面对象配置 */
polyObj = null;
this.handler = new Cesium.ScreenSpaceEventHandler(this.viewer.scene.canvas);
// left
this.handler.setInputAction((movement) => {
let cartesian = this.viewer.camera.pickEllipsoid(movement.position, this.viewer.scene.globe.ellipsoid);
let cartographic = Cesium.Cartographic.fromCartesian(cartesian, this.viewer.scene.globe.ellipsoid, new Cesium.Cartographic());
let lng = Cesium.Math.toDegrees(cartographic.longitude);
let lat = Cesium.Math.toDegrees(cartographic.latitude);
if (cartesian && cartesian.x) {
if (positions.length == 0) {
positions.push(cartesian.clone());
}
codeInfo.push([lng, lat]);
positions.push(cartesian.clone());
polygon.positions.push(cartesian.clone());
if (!polyObj) {
_polygonEntity.polyline = {
width: this.config.borderWidth,
material: this.config.borderColor,
clampToGround: false
};
_polygonEntity.polyline.positions = new Cesium.CallbackProperty(function () {
return positions;
}, false);
_polygonEntity.polygon = {
hierarchy: new Cesium.CallbackProperty(function () {
return polygon;
}, false),
material: this.config.material,
clampToGround: false
}
_polygonEntity.name = 'planeSelf'
_polygonEntity._id = id;
polyObj = this.viewer.entities.add(_polygonEntity);
}
}
}, Cesium.ScreenSpaceEventType.LEFT_CLICK);
// mouse
this.handler.setInputAction((movement) => {
let cartesian = this.viewer.camera.pickEllipsoid(movement.endPosition, this.viewer.scene.globe.ellipsoid);
if (Cesium.defined(cartesian)) {
let cartographic = Cesium.Cartographic.fromCartesian(cartesian, this.viewer.scene.globe.ellipsoid, new Cesium.Cartographic());
let lng = Cesium.Math.toDegrees(cartographic.longitude);
let lat = Cesium.Math.toDegrees(cartographic.latitude);
if (positions.length >= 0) {
if (cartesian && cartesian.x) {
positions.pop();
positions.push(cartesian);
polygon.positions.pop();
polygon.positions.push(cartesian);
codeInfo.pop();
codeInfo.push([lng, lat]);
}
}
}
}, Cesium.ScreenSpaceEventType.MOUSE_MOVE);
// right
this.handler.setInputAction((movement) => {
this.infoDetail.planeSelf.push({ id: id, positions: codeInfo });
this.handler.destroy();
positions.push(positions[0]);
}, Cesium.ScreenSpaceEventType.RIGHT_CLICK);
}
/*******
* @function: function
* @return {*}
* @description: 绘制线段
*/
drawLine() {
this.handler.destroy();
/**实体的唯一标注 */
let id = null;
/**记录拐点坐标 */
let positions = [],
/**记录返回结果 */
codeInfo = [],
/**面的hierarchy属性 */
polygon = new Cesium.PolygonHierarchy(),
_polygonEntity = new Cesium.Entity(),
/**面对象配置 */
polyObj = null;
this.handler = new Cesium.ScreenSpaceEventHandler(this.viewer.scene.canvas);
// left
this.handler.setInputAction((movement) => {
id = new Date().getTime();
let cartesian = this.viewer.camera.pickEllipsoid(movement.position, this.viewer.scene.globe.ellipsoid);
let cartographic = Cesium.Cartographic.fromCartesian(cartesian, this.viewer.scene.globe.ellipsoid, new Cesium.Cartographic());
let lng = Cesium.Math.toDegrees(cartographic.longitude);
let lat = Cesium.Math.toDegrees(cartographic.latitude);
if (cartesian && cartesian.x) {
if (positions.length == 0) {
positions.push(cartesian.clone());
}
codeInfo.push([lng, lat])
positions.push(cartesian.clone());
polygon.positions.push(cartesian.clone());
if (!polyObj) {
_polygonEntity.polyline = {
width: this.config.borderWidth,
material: this.config.lineColor,
clampToGround: false
};
_polygonEntity.polyline.positions = new Cesium.CallbackProperty(function () {
return positions;
}, false);
_polygonEntity.name = 'line';
_polygonEntity._id = id;
polyObj = this.viewer.entities.add(_polygonEntity);
}
}
}, Cesium.ScreenSpaceEventType.LEFT_CLICK);
// mouse
this.handler.setInputAction((movement) => {
let cartesian = this.viewer.camera.pickEllipsoid(movement.endPosition, this.viewer.scene.globe.ellipsoid);
if (Cesium.defined(cartesian)) {
let cartographic = Cesium.Cartographic.fromCartesian(cartesian, this.viewer.scene.globe.ellipsoid, new Cesium.Cartographic());
let lng = Cesium.Math.toDegrees(cartographic.longitude);
let lat = Cesium.Math.toDegrees(cartographic.latitude);
if (positions.length >= 0) {
if (cartesian && cartesian.x) {
positions.pop();
positions.push(cartesian);
codeInfo.pop();
codeInfo.push([lng, lat]);
}
}
}
}, Cesium.ScreenSpaceEventType.MOUSE_MOVE);
// right
this.handler.setInputAction((movement) => {
this.infoDetail.line.push({ id: id, positions: codeInfo });
this.handler.destroy();
}, Cesium.ScreenSpaceEventType.RIGHT_CLICK);
}
/*******
* @function: function
* @description: 移除实体对象
* @return {*}
*/
removeEntity() {
this.handler = new Cesium.ScreenSpaceEventHandler(this.viewer.scene.canvas)
this.handler.setInputAction((move) => {
/**实体对象信息 {id：entities，primitive：。。} */
let pick = this.viewer.scene.pick(move.endPosition);
if (pick && pick.id && pick.id.id) {
document.body.style.cursor = "pointer";
this.handler.setInputAction((click) => {
let newPoint;
switch (pick.id.name) {
case 'point':
/**删除某一条数据 */
newPoint = this.infoDetail.point.filter(item => item.id != pick.id._id);
this.infoDetail.point = newPoint;
break
case 'line':
/**删除某一条数据 */
newPoint = this.infoDetail.line.filter(item => item.id != pick.id._id);
this.infoDetail.line = newPoint;
break
case 'rectangle':
/**删除某一条数据 */
newPoint = this.infoDetail.rectangle.filter(item => item.id != pick.id._id);
this.infoDetail.rectangle = newPoint;
break
case 'planeSelf':
/**删除某一条数据 */
newPoint = this.infoDetail.planeSelf.filter(item => item.id != pick.id._id);
this.infoDetail.planeSelf = newPoint;
break
case 'circle':
/**删除某一条数据 */
newPoint = this.infoDetail.circle.filter(item => item.id != pick.id._id);
this.infoDetail.circle = newPoint;
break
default: break
}
this.viewer.entities.remove(pick.id);
}, Cesium.ScreenSpaceEventType.LEFT_CLICK);
} else {
document.body.style = "cursor: default;";
}
}, Cesium.ScreenSpaceEventType.MOUSE_MOVE);
}
/*******
* @function: function
* @return {*}
* @description: 返回绘制数据
*/
backInfoDetail() {
return this.infoDetail;
}
/**
* @description 计算空间两点间距离(计算第一个点、最后一个点)-方法1
* @param {*} lat1
* @param {*} lng1
* @param {*} lat2
* @param {*} lng2
* @return {*} m
*/
getSpaceDistance_first_last_1(lat1, lng1, lat2, lng2) {
var EARTH_RADIUS = 6378137.0; //单位M
var PI = Math.PI;
function getRad(d) {
return d * PI / 180.0;
}
var f = getRad((lat1 + lat2) / 2);
var g = getRad((lat1 - lat2) / 2);
var l = getRad((lng1 - lng2) / 2);
var sg = Math.sin(g);
var sl = Math.sin(l);
var sf = Math.sin(f);
var s, c, w, r, d, h1, h2;
var a = EARTH_RADIUS;
var fl = 1 / 298.257;
sg = sg * sg;
sl = sl * sl;
sf = sf * sf;
s = sg * (1 - sl) + (1 - sf) * sl;
c = (1 - sg) * (1 - sl) + sf * sl;
w = Math.atan(Math.sqrt(s / c));
r = Math.sqrt(s * c) / w;
d = 2 * w * a;
h1 = (3 * r - 1) / 2 / c;
h2 = (3 * r + 1) / 2 / s;
return d * (1 + fl * (h1 * sf * (1 - sg) - h2 * (1 - sf) * sg));
}
/**
* @description 计算空间两点间距离(计算数组第一个点、最后一个点)-方法2
* @param {*} positions [Cartesian3 { x, y, z }]
* @return {*} m
*/
getSpaceDistance_first_last_2(positions) {
let distance = 0;
for (let i = 0; i < positions.length - 1; i++) {
const point1cartographic = Cesium.Cartographic.fromCartesian(positions[0]);
const point2cartographic = Cesium.Cartographic.fromCartesian(positions[positions.length - 1]);
// 根据经纬度计算出距离
const geodesic = new Cesium.EllipsoidGeodesic();
// 设置测地线的起点和终点
geodesic.setEndPoints(point1cartographic, point2cartographic);
// 获取起点和终点之间的表面距离
let s = geodesic.surfaceDistance;
//返回两点之间的距离
s = Math.sqrt(Math.pow(s, 2) + Math.pow(point2cartographic.height - point1cartographic.height, 2));
distance = s;
}
return distance.toFixed(2);
}
/**
* @description 空间两点距离计算函数(每次计算数组最后两个点之间的距离)
* @param {*} positions [Cartesian3 { x, y, z }]
* @return {*} m
*/
getSpaceDistance_last_last(positions) {
let distance = 0;
for (let i = 0; i < positions.length - 1; i++) {
const point1cartographic = Cesium.Cartographic.fromCartesian(positions[positions.length - 1]);
const point2cartographic = Cesium.Cartographic.fromCartesian(positions[positions.length - 2]);
// 根据经纬度计算出距离
const geodesic = new Cesium.EllipsoidGeodesic();
// 设置测地线的起点和终点
geodesic.setEndPoints(point1cartographic, point2cartographic);
// 获取起点和终点之间的表面距离
let s = geodesic.surfaceDistance;
//返回两点之间的距离
s = Math.sqrt(Math.pow(s, 2) + Math.pow(point2cartographic.height - point1cartographic.height, 2));
distance = s;
}
return distance.toFixed(2);
}
/**
* @description 空间两点距离计算函数(所有点之间的距离相加)
* @param {*} positions Cartesian3 { x, y, z }
* @return {*} m
*/
getSpaceDistance_all(positions) {
let distance = 0;
for (let i = 0; i < positions.length - 1; i++) {
const point1cartographic = Cesium.Cartographic.fromCartesian(positions[i]);
const point2cartographic = Cesium.Cartographic.fromCartesian(positions[i + 1]);
// 根据经纬度计算出距离
const geodesic = new Cesium.EllipsoidGeodesic();
// 设置测地线的起点和终点
geodesic.setEndPoints(point1cartographic, point2cartographic);
// 获取起点和终点之间的表面距离
let s = geodesic.surfaceDistance;
//返回两点之间的距离
s = Math.sqrt(Math.pow(s, 2) + Math.pow(point2cartographic.height - point1cartographic.height, 2));
distance = distance + s;
}
return distance.toFixed(2);
}
}
调用方式：
let draw = new Draw(viewer)
draw.drawCircle();再绘制完成后获取坐标信息，可以在drawXxxx函数中添加回调函数，使用函数接收，如下：
drawCircle(callBack) {
...
callback(this.infoDetail.circle);
}
// 回调函数接收
draw.drawCircle((res) => {
// res === this.infoDetail.circle
});
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