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