331 lines
11 KiB
HTML
331 lines
11 KiB
HTML
<!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 name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no">
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<meta name="description" content="Star burst overlapping billboards.">
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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 type="text/javascript" src="../../../ThirdParty/requirejs-2.1.20/require.js"></script>
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<script type="text/javascript">
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require.config({
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baseUrl : '../../../Source',
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waitSeconds : 60
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});
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</script>
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</head>
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<body class="sandcastle-loading" data-sandcastle-bucket="bucket-requirejs.html">
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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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<div id="zoomButtons"></div>
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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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});
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// Add labels clustered at the same location
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var numBillboards = 30;
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for (var i = 0; i < numBillboards; ++i) {
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var position = Cesium.Cartesian3.fromDegrees(-75.59777, 40.03883);
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viewer.entities.add({
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position : position,
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billboard : {
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image : '../images/facility.gif',
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scale : 2.5
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},
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label : {
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text : 'Label' + i,
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show : false
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}
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});
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}
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var scene = viewer.scene;
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var camera = scene.camera;
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var handler = new Cesium.ScreenSpaceEventHandler(scene.canvas);
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handler.setInputAction(function(movement) {
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// Star burst on left mouse click.
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starBurst(movement.position);
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}, Cesium.ScreenSpaceEventType.LEFT_CLICK);
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handler.setInputAction(function(movement) {
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// Remove the star burst when the mouse exits the circle or show the label of the billboard the mouse is hovering over.
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updateStarBurst(movement.endPosition);
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}, Cesium.ScreenSpaceEventType.MOUSE_MOVE);
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camera.moveStart.addEventListener(function() {
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// Reset the star burst on camera move because the lines from the center
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// because the line end points rely on the screen space positions of the billboards.
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undoStarBurst();
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});
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// State saved across mouse click and move events
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var starBurstState = {
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enabled : false,
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pickedEntities : undefined,
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billboardEyeOffsets : undefined,
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labelEyeOffsets : undefined,
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linePrimitive : undefined,
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radius : undefined,
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center : undefined,
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pixelPadding : 10.0,
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angleStart : 0.0,
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angleEnd : Cesium.Math.PI,
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maxDimension : undefined
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};
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function offsetBillboard(entity, entityPosition, angle, magnitude, lines, billboardEyeOffsets, labelEyeOffsets) {
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var x = magnitude * Math.cos(angle);
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var y = magnitude * Math.sin(angle);
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var offset = new Cesium.Cartesian2(x, y);
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var drawingBufferWidth = scene.drawingBufferWidth;
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var drawingBufferHeight = scene.drawingBufferHeight;
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var diff = Cesium.Cartesian3.subtract(entityPosition, camera.positionWC, new Cesium.Cartesian3());
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var distance = Cesium.Cartesian3.dot(camera.directionWC, diff);
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var dimensions = camera.frustum.getPixelDimensions(drawingBufferWidth, drawingBufferHeight, distance, new Cesium.Cartesian2());
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Cesium.Cartesian2.multiplyByScalar(offset, Cesium.Cartesian2.maximumComponent(dimensions), offset);
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var labelOffset;
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var billboardOffset = entity.billboard.eyeOffset;
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var eyeOffset = new Cesium.Cartesian3(offset.x, offset.y, 0.0);
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entity.billboard.eyeOffset = eyeOffset;
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if (Cesium.defined(entity.label)) {
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labelOffset = entity.label.eyeOffset;
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entity.label.eyeOffset = new Cesium.Cartesian3(offset.x, offset.y, -10.0);
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}
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var endPoint = Cesium.Matrix4.multiplyByPoint(camera.viewMatrix, entityPosition, new Cesium.Cartesian3());
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Cesium.Cartesian3.add(eyeOffset, endPoint, endPoint);
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Cesium.Matrix4.multiplyByPoint(camera.inverseViewMatrix, endPoint, endPoint);
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lines.push(endPoint);
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billboardEyeOffsets.push(billboardOffset);
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labelEyeOffsets.push(labelOffset);
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}
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function starBurst(mousePosition) {
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if (Cesium.defined(starBurstState.pickedEntities)) {
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return;
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}
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var pickedObjects = scene.drillPick(mousePosition);
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if (!Cesium.defined(pickedObjects) || pickedObjects.length < 2) {
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return;
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}
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var billboardEntities = [];
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var length = pickedObjects.length;
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var i;
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for (i = 0; i < length; ++i) {
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var pickedObject = pickedObjects[i];
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if (pickedObject.primitive instanceof Cesium.Billboard) {
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billboardEntities.push(pickedObject);
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}
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}
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if (billboardEntities.length === 0) {
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return;
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}
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var pickedEntities = starBurstState.pickedEntities = [];
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var billboardEyeOffsets = starBurstState.billboardEyeOffsets = [];
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var labelEyeOffsets = starBurstState.labelEyeOffsets = [];
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var lines = [];
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starBurstState.maxDimension = Number.NEGATIVE_INFINITY;
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var angleStart = starBurstState.angleStart;
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var angleEnd = starBurstState.angleEnd;
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var angle = angleStart;
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var angleIncrease;
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var magnitude;
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var magIncrease;
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var maxDimension;
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// Drill pick gets all of the entities under the mouse pointer.
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// Find the billboards and set their pixel offsets in a circle pattern.
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length = billboardEntities.length;
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i = 0;
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while (i < length) {
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var object = billboardEntities[i];
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if (pickedEntities.length === 0) {
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starBurstState.center = Cesium.Cartesian3.clone(object.primitive.position);
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}
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if (!Cesium.defined(angleIncrease)) {
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var width = object.primitive.width;
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var height = object.primitive.height;
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maxDimension = Math.max(width, height) * object.primitive.scale + starBurstState.pixelPadding;
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magnitude = maxDimension + maxDimension * 0.5;
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magIncrease = magnitude;
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angleIncrease = maxDimension / magnitude;
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}
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offsetBillboard(object.id, object.primitive.position, angle, magnitude, lines, billboardEyeOffsets, labelEyeOffsets);
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pickedEntities.push(object);
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var reflectedAngle = angleEnd - angle;
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if (i + 1 < length && reflectedAngle - angleIncrease * 0.5 > angle + angleIncrease * 0.5) {
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object = billboardEntities[++i];
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offsetBillboard(object.id, object.primitive.position, reflectedAngle, magnitude, lines, billboardEyeOffsets, labelEyeOffsets);
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pickedEntities.push(object);
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}
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angle += angleIncrease;
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if (reflectedAngle - angleIncrease * 0.5 < angle + angleIncrease * 0.5) {
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magnitude += magIncrease;
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angle = angleStart;
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angleIncrease = maxDimension / magnitude;
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}
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++i;
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}
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// Add lines from the pick center out to the translated billboard.
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var instances = [];
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length = lines.length;
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for (i = 0; i < length; ++i) {
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var pickedEntity = pickedEntities[i];
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starBurstState.maxDimension = Math.max(pickedEntity.primitive.width, pickedEntity.primitive.height, starBurstState.maxDimension);
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instances.push(new Cesium.GeometryInstance({
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geometry : new Cesium.SimplePolylineGeometry({
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positions : [starBurstState.center, lines[i]],
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arcType : Cesium.ArcType.NONE,
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granularity : Cesium.Math.PI_OVER_FOUR
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}),
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attributes : {
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color : Cesium.ColorGeometryInstanceAttribute.fromColor(Cesium.Color.WHITE)
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}
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}));
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}
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starBurstState.linePrimitive = scene.primitives.add(new Cesium.Primitive({
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geometryInstances : instances,
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appearance : new Cesium.PerInstanceColorAppearance({
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flat : true,
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translucent : false
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}),
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asynchronous : false
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}));
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viewer.selectedEntity = undefined;
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starBurstState.radius = magnitude + magIncrease;
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}
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function updateStarBurst(mousePosition) {
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if (!Cesium.defined(starBurstState.pickedEntities)) {
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return;
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}
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if (!starBurstState.enabled) {
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// For some reason we get a mousemove event on click, so
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// do not show a label on the first event.
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starBurstState.enabled = true;
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return;
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}
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// Remove the star burst if the mouse exits the screen space circle.
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// If the mouse is inside the circle, show the label of the billboard the mouse is hovering over.
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var screenPosition = Cesium.SceneTransforms.wgs84ToWindowCoordinates(scene, starBurstState.center);
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var fromCenter = Cesium.Cartesian2.subtract(mousePosition, screenPosition, new Cesium.Cartesian2());
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var radius = starBurstState.radius;
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if (Cesium.Cartesian2.magnitudeSquared(fromCenter) > radius * radius || fromCenter.y > 3.0 * (starBurstState.maxDimension + starBurstState.pixelPadding)) {
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undoStarBurst();
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} else {
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showLabels(mousePosition);
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}
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}
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function undoStarBurst() {
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var pickedEntities = starBurstState.pickedEntities;
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if (!Cesium.defined(pickedEntities)) {
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return;
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}
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var billboardEyeOffsets = starBurstState.billboardEyeOffsets;
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var labelEyeOffsets = starBurstState.labelEyeOffsets;
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// Reset billboard and label pixel offsets.
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// Hide overlapping labels.
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for (var i = 0; i < pickedEntities.length; ++i) {
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var entity = pickedEntities[i].id;
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entity.billboard.eyeOffset = billboardEyeOffsets[i];
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if (Cesium.defined(entity.label)) {
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entity.label.eyeOffset = labelEyeOffsets[i];
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entity.label.show = false;
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}
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}
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// Remove lines from the scene.
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// Free resources and reset state.
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scene.primitives.remove(starBurstState.linePrimitive);
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starBurstState.linePrimitive = undefined;
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starBurstState.pickedEntities = undefined;
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starBurstState.billboardEyeOffsets = undefined;
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starBurstState.labelEyeOffsets = undefined;
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starBurstState.radius = undefined;
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starBurstState.enabled = false;
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}
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var currentObject;
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function showLabels(mousePosition) {
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var pickedObjects = scene.drillPick(mousePosition);
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var pickedObject;
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if (Cesium.defined(pickedObjects)) {
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var length = pickedObjects.length;
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for (var i = 0; i < length; ++i) {
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if (pickedObjects[i].primitive instanceof Cesium.Billboard) {
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pickedObject = pickedObjects[i];
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break;
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}
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}
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}
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if (pickedObject !== currentObject) {
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if (Cesium.defined(pickedObject) && Cesium.defined(pickedObject.id.label)) {
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if (Cesium.defined(currentObject)) {
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currentObject.id.label.show = false;
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}
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currentObject = pickedObject;
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pickedObject.id.label.show = true;
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} else if (Cesium.defined(currentObject)) {
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currentObject.id.label.show = false;
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currentObject = undefined;
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}
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}
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}
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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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startup(Cesium);
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} else if (typeof require === 'function') {
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require(['Cesium'], startup);
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}
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</script>
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</body>
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</html>
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