CesiumJS
JavaScriptで、地図をいじれるものに、LeafLetなどもありますが、こちらはもっと高速に3Dの地図をいじれるものです。LeafLetがGoogle Mapsなら、CesiumJSはGoogle Earthっていう感じです。オープンソースで開発されています。Githubのページはこちらです。
どんなことができるのか?例えば、こちらは、3Dの地図の中に飛行機を飛ばせるんです。
↑の画像をクリックすると、アニメーションのように動くタブが現れます。
Cesium自体は、アプリにもできたり、いろいろな言語でもプログラミング可能なようです。
その中にCesiumJSというJavaScriptで作れるものがあります。
- Cesium Ion :APIや、ツール類が入っているものです。アカウント作成は必要です。
- CesiumJS:JavaScriptで地図に図形などを描画できます。
そのほかに、for Unrealや、for O3DEなどのゲーム向けや、シミュレーション向けのものもあります。
上の飛行機が飛ぶやつのコードは、たったこれだけなんです。 index.htmlの中に入れた <script></script>で囲まれた部分です。
<!DOCTYPE html> <html lang="en"> <head> <script src="https://cesium.com/downloads/cesiumjs/releases/1.82/Build/Cesium/Cesium.js"></script> <link href="https://cesium.com/downloads/cesiumjs/releases/1.82/Build/Cesium/Widgets/widgets.css" rel="stylesheet"> <link href="style.css" rel="stylesheet"> </head> <body> <div id="cesiumContainer"></div> <script> Cesium.Ion.defaultAccessToken = 'Token'; const viewer = new Cesium.Viewer('cesiumContainer', { terrainProvider: Cesium.createWorldTerrain() }); const osmBuildings = viewer.scene.primitives.add(Cesium.createOsmBuildings()); const flightData = JSON.parse( 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/* Initialize the viewer clock:*/ const timeStepInSeconds = 30; const totalSeconds = timeStepInSeconds * (flightData.length - 1); const start = Cesium.JulianDate.fromIso8601("2020-03-09T23:10:00Z"); const stop = Cesium.JulianDate.addSeconds(start, totalSeconds, new Cesium.JulianDate()); viewer.clock.startTime = start.clone(); viewer.clock.stopTime = stop.clone(); viewer.clock.currentTime = start.clone(); viewer.timeline.zoomTo(start, stop); // Speed up the playback speed 50x. viewer.clock.multiplier = 50; // Start playing the scene. viewer.clock.shouldAnimate = true; const positionProperty = new Cesium.SampledPositionProperty(); for (let i = 0; i < flightData.length; i++) { const dataPoint = flightData[i]; const time = Cesium.JulianDate.addSeconds(start, i * timeStepInSeconds, new Cesium.JulianDate()); const position = Cesium.Cartesian3.fromDegrees(dataPoint.longitude, dataPoint.latitude, dataPoint.height); positionProperty.addSample(time, position); viewer.entities.add({ description: `Location: (${dataPoint.longitude}, ${dataPoint.latitude}, ${dataPoint.height})`, position: position, point: { pixelSize: 10, color: Cesium.Color.RED } }); } const airplaneEntity = viewer.entities.add({ availability: new Cesium.TimeIntervalCollection([ new Cesium.TimeInterval({ start: start, stop: stop }) ]), position: positionProperty, point: { pixelSize: 30, color: Cesium.Color.GREEN }, path: new Cesium.PathGraphics({ width: 3 }) }); // Make the camera track this moving entity. viewer.trackedEntity = airplaneEntity; async function loadModel() { // Load the glTF model from Cesium ion. const airplaneUri = await Cesium.IonResource.fromAssetId(ID); const airplaneEntity = viewer.entities.add({ availability: new Cesium.TimeIntervalCollection([ new Cesium.TimeInterval({ start: start, stop: stop }) ]), position: positionProperty, // Attach the 3D model instead of the green point. model: { uri: airplaneUri }, // Automatically compute the orientation from the position. orientation: new Cesium.VelocityOrientationProperty(positionProperty), path: new Cesium.PathGraphics({ width: 3 }) }); viewer.trackedEntity = airplaneEntity; } loadModel(); </script> </body> </html>
チュートリアルとSandBoxが優れてます。
Webで完結できるからなんですけど。。。
本来は、npmなどを入れてローカルでサーバー作ってみたいなことを開発環境を作るために必要になるのですが。。こいつは、
チュートリアル
チュートリアルは、Glitchで、サンプルのプログラムはSandBoxでコードをいじりながら、どう動くのかを理解することができます。
CesiumJSのチュートリアルのページは、Glitchで試すことができるので、そこでIndex.htmlやCSSなどのファイルを作ってダウンロードして、自分の環境に持ってくることができます。
こんな感じです。 Glitchのテンプレートで読み込まれるので、環境設定もされてます。
このチュートリアルの日本語版を少し作ってみようかな??。。勉強がてら。。
英語版も古いGlitchのインターフェースなので、ちょっと今と違うし(笑)
ちなみに、Glitchは、GoogleアカウントかGithubアカウントと連携できます。
また、APIのKEYや、モデル作成のためのツール類がそこにあるので、これを使うには、Cesium IONのアカウントが必要です。
コードサンプル SandBox
コードのサンプルもWeb上で変更して試すことができます。これはSandBoxっていう機能ですね。Sandcastleか?(笑)
こちらも、Glitchと同じですが、API keyなどはいらない作りなので、そのままコピーしてきてもCesiumJSでは動かせないところがありますけど、学習するにはちょうど良い感じです。
まずは、これで遊んでみるのもいいかと思います。
これにアクセスするだけで、どんなことできるか?よくわかりますよ。