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| { | ||
| "extends": "./Tools/eslint-config-cesium/browser.js", | ||
| "rules": { | ||
| "no-unused-vars": ["error", {"vars": "all", "args": "none"}] | ||
| } | ||
| } |
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| { | ||
| "extends": "../../.eslintrc", | ||
| "extends": "../../.eslintrc.json", | ||
| "globals": { | ||
| "JSON": true, | ||
| "require": true, | ||
|
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| <!DOCTYPE html> | ||
| <html lang="en"> | ||
| <head> | ||
| <meta charset="utf-8"> | ||
| <meta http-equiv="X-UA-Compatible" content="IE=edge"> | ||
| <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no"> | ||
| <meta name="description" content="Use Viewer to start building new applications or easily embed Cesium into existing applications."> | ||
| <meta name="cesium-sandcastle-labels" content="Beginner, Showcases"> | ||
| <title>Cesium Demo</title> | ||
| <script type="text/javascript" src="../Sandcastle-header.js"></script> | ||
| <script type="text/javascript" src="../../../ThirdParty/requirejs-2.1.20/require.js"></script> | ||
| <script type="text/javascript"> | ||
| require.config({ | ||
| baseUrl : '../../../Source', | ||
| waitSeconds : 60 | ||
| }); | ||
| </script> | ||
| </head> | ||
| <body class="sandcastle-loading" data-sandcastle-bucket="bucket-requirejs.html"> | ||
| <style> | ||
| @import url(../templates/bucket.css); | ||
| </style> | ||
| <div id="cesiumContainer" class="fullSize"></div> | ||
| <div id="loadingOverlay"><h1>Loading...</h1></div> | ||
| <div id="toolbar"></div> | ||
| <script id="cesium_sandcastle_script"> | ||
| function startup(Cesium) { | ||
| 'use strict'; | ||
| //Sandcastle_Begin | ||
| // This example illustrates a Callback Property, a property whose | ||
| // value is lazily evaluated by a callback function. | ||
| // Use a CallbackProperty when your data can't be pre-computed | ||
| // or needs to be derived from other properties at runtime. | ||
| var viewer = new Cesium.Viewer('cesiumContainer'); | ||
|
|
||
| var startLatitude = 35; | ||
| var startLongitude = -120; | ||
| var endLongitude; | ||
| var startTime = Cesium.JulianDate.now(); | ||
|
|
||
| // Add a polyline to the scene. Positions are dynamic. | ||
| var isConstant = false; | ||
| var redLine = viewer.entities.add({ | ||
| polyline : { | ||
| // This callback updates positions each frame. | ||
| positions : new Cesium.CallbackProperty(function(time, result) { | ||
| endLongitude = startLongitude + 0.001 * Cesium.JulianDate.secondsDifference(time, startTime); | ||
| return Cesium.Cartesian3.fromDegreesArray([startLongitude, startLatitude, endLongitude, startLatitude], Cesium.Ellipsoid.WGS84, result); | ||
| }, isConstant), | ||
| width : 5, | ||
| material : Cesium.Color.RED | ||
| } | ||
| }); | ||
|
|
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| var startCartographic = Cesium.Cartographic.fromDegrees(startLongitude, startLatitude); | ||
|
|
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| // use scratch object to avoid new allocations per frame. | ||
| var endCartographic = new Cesium.Cartographic(); | ||
| var scratch = new Cesium.Cartographic(); | ||
| var geodesic = new Cesium.EllipsoidGeodesic(); | ||
|
|
||
| // Calculate the length of the line | ||
| function getLength(time, result) { | ||
| // Get the end position from the polyLine's callback. | ||
| var endPoint = redLine.polyline.positions.getValue(time, result)[1]; | ||
| endCartographic = Cesium.Cartographic.fromCartesian(endPoint); | ||
|
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| geodesic.setEndPoints(startCartographic, endCartographic); | ||
| var lengthInMeters = Math.round(geodesic.surfaceDistance); | ||
| return (lengthInMeters / 1000).toFixed(1) + " km"; | ||
| } | ||
|
|
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| function getMidpoint(time, result) { | ||
| // Get the end position from the polyLine's callback. | ||
| var endPoint = redLine.polyline.positions.getValue(time, result)[1]; | ||
| endCartographic = Cesium.Cartographic.fromCartesian(endPoint); | ||
|
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| geodesic.setEndPoints(startCartographic, endCartographic); | ||
| var midpointCartographic = geodesic.interpolateUsingFraction(0.5, scratch); | ||
| return Cesium.Cartesian3.fromRadians(midpointCartographic.longitude, midpointCartographic.latitude); | ||
| } | ||
|
|
||
| // Label the polyline with calculated length. | ||
| var label = viewer.entities.add({ | ||
| position : new Cesium.CallbackProperty(getMidpoint, isConstant), | ||
| label : { | ||
| // This callback updates the length to print each frame. | ||
| text: new Cesium.CallbackProperty(getLength, isConstant), | ||
| font : '20px sans-serif', | ||
| pixelOffset : new Cesium.Cartesian2(0.0, 20) | ||
| } | ||
| }); | ||
|
|
||
| // Keep the view centered. | ||
| viewer.trackedEntity = label; | ||
| //Sandcastle_End | ||
| Sandcastle.finishedLoading(); | ||
| } | ||
| if (typeof Cesium !== "undefined") { | ||
| startup(Cesium); | ||
| } else if (typeof require === "function") { | ||
| require(["Cesium"], startup); | ||
| } | ||
| </script> | ||
| </body> | ||
| </html> |
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