<!DOCTYPE html>
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<html lang="en">
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<head>
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<!-- Use correct character set. -->
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<meta charset="utf-8">
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<!-- Tell IE to use the latest, best version. -->
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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<!-- Make the application on mobile take up the full browser screen and disable user scaling. -->
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<meta name="viewport"
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content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no">
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<title>Hello World!</title>
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<!-- 本地 -->
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<script src="../../libs/Cesium/Cesium.js"></script>
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<link rel="stylesheet" type="text/css" href="../../libs/Cesium/Widgets/widgets.css" />
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<!-- 线上 -->
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<!--<script src="https://cesiumjs.org/releases/1.62/Build/Cesium/Cesium.js"></script>
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<script src="https://cesiumjs.org/releases/1.62/Apps/Sandcastle/Sandcastle-header.js"></script>
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<link href="https://cesiumjs.org/releases/1.62/Build/Cesium/Widgets/widgets.css" rel="stylesheet">-->
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</head>
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<body>
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<div id="cesiumContainer"></div>
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<div id="toolbar" style="margin: 5px;padding: 2px 5px;position: absolute;top:50px"></div>
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<script>
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var activeShapePoints = [];
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var activeShape;
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var floatingPoint;
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Cesium.Ion.defaultAccessToken = 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJqdGkiOiI2ODUxMWQxMC1lNzZjLTRhZjktYmZiMS1lNWFmYWJkZWIwOTEiLCJpZCI6MTQxNzMsInNjb3BlcyI6WyJhc3IiLCJnYyJdLCJpYXQiOjE1NjQ5Njg5NzV9.ojKhhmjl8L0EtxsZC14LZgmXn5VVS0CRBCYuRK_DdIo';
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//查看器
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var viewer = new Cesium.Viewer('cesiumContainer', {
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selectionIndicator: false,
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infoBox: false,
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// 注释时相当于使用默认地形，解开注释相当于使用全球地形
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terrainProvider: Cesium.createWorldTerrain()
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});
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var handler = new Cesium.ScreenSpaceEventHandler(viewer.canvas);
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//双击鼠标左键清除默认事件
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viewer.cesiumWidget.screenSpaceEventHandler.removeInputAction(Cesium.ScreenSpaceEventType.LEFT_DOUBLE_CLICK);
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//绘制点
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function createPoint(worldPosition) {
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var point = viewer.entities.add({
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position: worldPosition,
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point: {
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color: Cesium.Color.WHITE,
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pixelSize: 5,
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heightReference: Cesium.HeightReference.CLAMP_TO_GROUND
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}
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});
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return point;
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}
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//初始化为线
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var drawingMode = 'circle';
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//绘制图形
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function drawShape(positionData) {
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var shape;
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if (drawingMode === 'line') {
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shape = viewer.entities.add({
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polyline: {
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positions: positionData,
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clampToGround: true,
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width: 3
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}
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});
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} else if (drawingMode === 'polygon') {
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shape = viewer.entities.add({
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polygon: {
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hierarchy: positionData,
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material: new Cesium.ColorMaterialProperty(Cesium.Color.WHITE.withAlpha(0.7))
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}
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});
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} else if (drawingMode === 'circle') {
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//当positionData为数组时绘制最终图，如果为function则绘制动态图
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var value = typeof positionData.getValue === 'function' ? positionData.getValue(0) : positionData;
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//var start = activeShapePoints[0];
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//var end = activeShapePoints[activeShapePoints.length - 1];
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//var r = Math.sqrt(Math.pow(start.x - end.x, 2) + Math.pow(start.y - end.y, 2));
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//r = r ? r : r + 1;
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shape = viewer.entities.add({
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position: activeShapePoints[0],
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name: 'Blue translucent, rotated, and extruded ellipse with outline',
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type: 'Selection tool',
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ellipse: {
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semiMinorAxis: new Cesium.CallbackProperty(function () {
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//半径 两点间距离
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var r = Math.sqrt(Math.pow(value[0].x - value[value.length - 1].x, 2) + Math
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.pow(value[0].y - value[value.length - 1].y, 2));
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return r ? r : r + 1;
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}, false),
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semiMajorAxis: new Cesium.CallbackProperty(function () {
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var r = Math.sqrt(Math.pow(value[0].x - value[value.length - 1].x, 2) + Math
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.pow(value[0].y - value[value.length - 1].y, 2));
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return r ? r : r + 1;
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}, false),
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material: Cesium.Color.BLUE.withAlpha(0.5),
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outline: true
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}
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});
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} else if (drawingMode === 'rectangle') {
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//当positionData为数组时绘制最终图，如果为function则绘制动态图
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var arr = typeof positionData.getValue === 'function' ? positionData.getValue(0) : positionData;
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shape = viewer.entities.add({
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name: 'Blue translucent, rotated, and extruded ellipse with outline',
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rectangle: {
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coordinates: new Cesium.CallbackProperty(function () {
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var obj = Cesium.Rectangle.fromCartesianArray(arr);
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//if(obj.west==obj.east){ obj.east+=0.000001};
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//if(obj.south==obj.north){obj.north+=0.000001};
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return obj;
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}, false),
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material: Cesium.Color.RED.withAlpha(0.5)
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}
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});
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}
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return shape;
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}
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//鼠标左键
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handler.setInputAction(function (event) {
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// We use `viewer.scene.pickPosition` here instead of `viewer.camera.pickEllipsoid` so that
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// we get the correct point when mousing over terrain.
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// scene.pickPosition只有在开启地形深度检测，且不使用默认地形时是准确的。
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var earthPosition = viewer.scene.pickPosition(event.position);
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// `earthPosition` will be undefined if our mouse is not over the globe.
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if (Cesium.defined(earthPosition)) {
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if (activeShapePoints.length === 0) {
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floatingPoint = createPoint(earthPosition);
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activeShapePoints.push(earthPosition);
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var dynamicPositions = new Cesium.CallbackProperty(function () {
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if (drawingMode === 'polygon') {
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return new Cesium.PolygonHierarchy(activeShapePoints);
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}
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return activeShapePoints;
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}, false);
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activeShape = drawShape(dynamicPositions); //绘制动态图
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}
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activeShapePoints.push(earthPosition);
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createPoint(earthPosition);
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}
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}, Cesium.ScreenSpaceEventType.LEFT_CLICK);
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//鼠标移动
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handler.setInputAction(function (event) {
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if (Cesium.defined(floatingPoint)) {
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var newPosition = viewer.scene.pickPosition(event.endPosition);
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if (Cesium.defined(newPosition)) {
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floatingPoint.position.setValue(newPosition);
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activeShapePoints.pop();
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activeShapePoints.push(newPosition);
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}
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}
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}, Cesium.ScreenSpaceEventType.MOUSE_MOVE);
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// Redraw the shape so it's not dynamic and remove the dynamic shape.
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function terminateShape() {
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activeShapePoints.pop(); //去除最后一个动态点
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if (activeShapePoints.length) {
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drawShape(activeShapePoints); //绘制最终图
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}
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viewer.entities.remove(floatingPoint); //去除动态点图形（当前鼠标点）
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viewer.entities.remove(activeShape); //去除动态图形
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floatingPoint = undefined;
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activeShape = undefined;
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activeShapePoints = [];
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}
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handler.setInputAction(function (event) {
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terminateShape();
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}, Cesium.ScreenSpaceEventType.RIGHT_CLICK);
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var options = [{
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text: 'Draw Lines',
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onselect: function () {
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terminateShape();
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drawingMode = 'line';
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}
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}, {
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text: 'Draw Polygons',
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onselect: function () {
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terminateShape();
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drawingMode = 'polygon';
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}
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}, {
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text: 'Draw Circle',
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onselect: function () {
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terminateShape();
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drawingMode = 'circle';
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}
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}, {
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text: 'Draw Rectangle',
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onselect: function () {
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terminateShape();
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drawingMode = 'rectangle';
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}
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}];
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// Zoom in to an area with mountains
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viewer.camera.lookAt(Cesium.Cartesian3.fromDegrees(-122.2058, 46.1955, 1000.0), new Cesium.Cartesian3(5000.0,
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5000.0, 5000.0));
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viewer.camera.lookAtTransform(Cesium.Matrix4.IDENTITY);
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//viewer.scene.globe.depthTestAgainstTerrain = true;//开启地形深度检测，如果鼠标指针和点不重合，这个选项设置为true试试。
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</script>
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</body>
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</html>
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