<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8" />
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<meta http-equiv="X-UA-Compatible" content="IE=edge" />
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<meta
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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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/>
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<meta
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name="description"
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content="Draw lines and polygons on terrain with mouse clicks."
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/>
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<meta name="cesium-sandcastle-labels" content="Showcases" />
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<title>Cesium Demo</title>
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<script type="text/javascript" src="../Sandcastle-header.js"></script>
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<script
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type="text/javascript"
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src="../../../Build/CesiumUnminified/Cesium.js"
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nomodule
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></script>
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<script type="module" src="../load-cesium-es6.js"></script>
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</head>
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<body
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class="sandcastle-loading"
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data-sandcastle-bucket="bucket-requirejs.html"
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>
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<style>
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@import url(../templates/bucket.css);
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</style>
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<div id="cesiumContainer" class="fullSize"></div>
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<div id="loadingOverlay"><h1>Loading...</h1></div>
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<div id="toolbar">
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<table class="infoPanel">
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<tbody>
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<tr>
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<td>Left click to add a vertex.</td>
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</tr>
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<tr>
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<td>Right click to start new shape.</td>
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</tr>
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</tbody>
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</table>
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</div>
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<script id="cesium_sandcastle_script">
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function startup(Cesium) {
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"use strict";
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//Sandcastle_Begin
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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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terrainProvider: Cesium.createWorldTerrain(),
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});
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if (!viewer.scene.pickPositionSupported) {
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window.alert("This browser does not support pickPosition.");
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}
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viewer.cesiumWidget.screenSpaceEventHandler.removeInputAction(
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Cesium.ScreenSpaceEventType.LEFT_DOUBLE_CLICK
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);
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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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var drawingMode = "line";
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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(
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Cesium.Color.WHITE.withAlpha(0.7)
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),
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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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var activeShapePoints = [];
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var activeShape;
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var floatingPoint;
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var handler = new Cesium.ScreenSpaceEventHandler(viewer.canvas);
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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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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);
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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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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();
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drawShape(activeShapePoints);
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viewer.entities.remove(floatingPoint);
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viewer.entities.remove(activeShape);
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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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{
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text: "Draw Lines",
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onselect: function () {
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if (!Cesium.Entity.supportsPolylinesOnTerrain(viewer.scene)) {
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window.alert(
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"This browser does not support polylines on terrain."
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);
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}
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terminateShape();
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drawingMode = "line";
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},
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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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];
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Sandcastle.addToolbarMenu(options);
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// Zoom in to an area with mountains
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viewer.camera.lookAt(
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Cesium.Cartesian3.fromDegrees(-122.2058, 46.1955, 1000.0),
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new Cesium.Cartesian3(5000.0, 5000.0, 5000.0)
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);
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viewer.camera.lookAtTransform(Cesium.Matrix4.IDENTITY);
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//Sandcastle_End
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Sandcastle.finishedLoading();
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}
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if (typeof Cesium !== "undefined") {
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window.startupCalled = true;
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startup(Cesium);
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}
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</script>
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</body>
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</html>
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