Cesium學習筆記（七）：Demo學習（自由控制飛行的飛機）[轉]
阿新 • • 發佈：2019-01-09
https://blog.csdn.net/umgsoil/article/details/74923013#
這是官方的教程Demo，名字叫Use HeadingPitchRoll，顧名思義，就是教你用HeadingPitchRoll這個方法的，下面我們就來看一看這個Demo
首先先說一下，這個Demo是沙盒裡面的，所以如果你想在本地執行的話需要改一下html
這裡是html
<!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">
<title>Hello World!</title>
<script src="../Build/Cesium/Cesium.js"></script>
<!-- 如果要用沙盒裡的東西的話加上這個 -->
<script src="../Apps/Sandcastle/Sandcastle-header.js"></script>
<!-- 一定要加上這個css樣式 -->
<link rel="stylesheet" href="Sandcastle/templates/bucket.css">
<style>
@import url(../Build/Cesium/Widgets/widgets.css);
</style>
</head>
<body>
<div id="cesiumContainer" class="fullSize"></div>
<div id="toolbar">
<!-- 這是Demo需要的側邊欄 -->
<table class="infoPanel">
<tbody>
<tr>
<td>Click on the 3D window then use the keyboard to change settings.</td>
</tr>
<tr>
<td>Heading: <span id="heading"></span>°</td>
</tr>
<tr>
<td>← to left/→ to right</td>
</tr>
<tr>
<td>Pitch: <span id="pitch"></span>°</td>
</tr>
<tr>
<td>↑ to up/↓ to down</td>
</tr>
<tr>
<td>roll: <span id="roll"></span>°</td>
</tr>
<tr>
<td>← + ⇧ left/→ + ⇧ right</td>
</tr>
<tr>
<td>Speed: <span id="speed"></span>m/s</td>
</tr>
<tr>
<td>↑ + ⇧ to speed up/↓ + ⇧ to speed down</td>
</tr>
<tr>
<td>following aircraft
<input id="fromBehind" type="checkbox">
</td>
</tr>
</tbody>
</table>
</div>
<script src="你的js檔案"></script>
</body>
</html>
這是js程式碼
//飛機飛行
var canvas = viewer.canvas;
canvas.setAttribute('tabindex', '0'); // 將焦點放在畫布上
//如果點選就獲取畫布焦點
canvas.addEventListener('click', function() {
canvas.focus();
});
canvas.focus();
//飛行路徑的位置
var pathPosition = new Cesium.SampledPositionProperty();
//新增飛機飛行路徑
var entityPath = viewer.entities.add({
position : pathPosition,
name : 'path',
path : {
show : true,
leadTime : 0,
trailTime : 60,
width : 10,
resolution : 1,
material : new Cesium.PolylineGlowMaterialProperty({
glowPower : 0.3,
color : Cesium.Color.PALEGOLDENROD
})
}
});
var camera = viewer.camera;
var controller = scene.screenSpaceCameraController;
var r = 0;
//中心點
var center = new Cesium.Cartesian3();
//機身模型的偏移引數
var hpRoll = new Cesium.HeadingPitchRoll();
//相機模型的偏移引數
var hpRange = new Cesium.HeadingPitchRange();
var speed = 10;
//預設按一下偏移3度
var deltaRadians = Cesium.Math.toRadians(3.0);
//飛機位置
var position = Cesium.Cartesian3.fromDegrees(-123.0744619, 44.0503706, 5000.0);
//速度向量
var speedVector = new Cesium.Cartesian3();
//生成一個由兩個參考系生成的矩陣
var fixedFrameTransform = Cesium.Transforms.localFrameToFixedFrameGenerator('north', 'west');
//新增模型
var planePrimitive = scene.primitives.add(Cesium.Model.fromGltf({
//這裡需要把模型路徑改下(如果你用的還是HelloWord.html的話就用這個,不是的話請自行修改)
url : '../Apps/SampleData/models/CesiumAir/Cesium_Air.glb',
modelMatrix : Cesium.Transforms.headingPitchRollToFixedFrame(position, hpRoll, Cesium.Ellipsoid.WGS84, fixedFrameTransform),
minimumPixelSize : 128
}));
//動畫播放
planePrimitive.readyPromise.then(function(model) {
// 以半速迴圈動畫
model.activeAnimations.addAll({
speedup : 0.5,
loop : Cesium.ModelAnimationLoop.REPEAT
});
//r=2*max(模型的半徑，相機的最近距離)
r = 2.0 * Math.max(model.boundingSphere.radius, camera.frustum.near);
//鏡頭最近距離
controller.minimumZoomDistance = r * 0.5;
//計算center位置(也為下面的鏡頭跟隨提供了center位置)
Cesium.Matrix4.multiplyByPoint(model.modelMatrix, model.boundingSphere.center, center);
//相機偏移角度
var heading = Cesium.Math.toRadians(230.0);
var pitch = Cesium.Math.toRadians(-20.0);
hpRange.heading = heading;
hpRange.pitch = pitch;
hpRange.range = r * 50.0;
//固定相機
camera.lookAt(center, hpRange);
});
//鍵盤監聽
document.addEventListener('keydown', function(e) {
switch (e.keyCode) {
case 40:
if (e.shiftKey) {
// 按住shift加下箭頭減速
speed = Math.max(--speed, 1);
} else {
// 直接按下箭頭降低角度
hpRoll.pitch -= deltaRadians;
if (hpRoll.pitch < -Cesium.Math.TWO_PI) {
hpRoll.pitch += Cesium.Math.TWO_PI;
}
}
break;
case 38:
if (e.shiftKey) {
// 按住shift加上箭頭加速
speed = Math.min(++speed, 100);
} else {
// 直接按上箭頭擡高角度
hpRoll.pitch += deltaRadians;
if (hpRoll.pitch > Cesium.Math.TWO_PI) {
hpRoll.pitch -= Cesium.Math.TWO_PI;
}
}
break;
case 39:
if (e.shiftKey) {
// 飛機本身向右旋轉
hpRoll.roll += deltaRadians;
if (hpRoll.roll > Cesium.Math.TWO_PI) {
hpRoll.roll -= Cesium.Math.TWO_PI;
}
} else {
// 向右飛行
hpRoll.heading += deltaRadians;
if (hpRoll.heading > Cesium.Math.TWO_PI) {
hpRoll.heading -= Cesium.Math.TWO_PI;
}
}
break;
case 37:
if (e.shiftKey) {
// 飛機本身向左旋轉
hpRoll.roll -= deltaRadians;
if (hpRoll.roll < 0.0) {
hpRoll.roll += Cesium.Math.TWO_PI;
}
} else {
// 向左飛行
hpRoll.heading -= deltaRadians;
if (hpRoll.heading < 0.0) {
hpRoll.heading += Cesium.Math.TWO_PI;
}
}
break;
default:
}
});
var headingSpan = document.getElementById('heading');
var pitchSpan = document.getElementById('pitch');
var rollSpan = document.getElementById('roll');
var speedSpan = document.getElementById('speed');
var fromBehind = document.getElementById('fromBehind');
//給左邊的通知欄更新資料同時重新整理飛機位置(這裡也是個1ms一次的回撥)
viewer.scene.preRender.addEventListener(function(scene, time) {
headingSpan.innerHTML = Cesium.Math.toDegrees(hpRoll.heading).toFixed(1);
pitchSpan.innerHTML = Cesium.Math.toDegrees(hpRoll.pitch).toFixed(1);
rollSpan.innerHTML = Cesium.Math.toDegrees(hpRoll.roll).toFixed(1);
speedSpan.innerHTML = speed.toFixed(1);
//選擇的笛卡爾分量Cartesian3.UNIT_X（x軸單位長度）乘以一個標量speed/10，得到速度向量speedVector
speedVector = Cesium.Cartesian3.multiplyByScalar(Cesium.Cartesian3.UNIT_X, speed / 10, speedVector);
//飛機的模型矩陣與速度向量speedVector相乘，得到position
position = Cesium.Matrix4.multiplyByPoint(planePrimitive.modelMatrix, speedVector, position);
//新增一個路徑模型(就是白色的尾氣)
pathPosition.addSample(Cesium.JulianDate.now(), position);
//飛機位置+旋轉角度+地球+座標矩陣=飛機模型矩陣
Cesium.Transforms.headingPitchRollToFixedFrame(position, hpRoll, Cesium.Ellipsoid.WGS84, fixedFrameTransform, planePrimitive.modelMatrix);
if (fromBehind.checked) {
// 鏡頭跟隨
Cesium.Matrix4.multiplyByPoint(planePrimitive.modelMatrix, planePrimitive.boundingSphere.center, center);
hpRange.heading = hpRoll.heading;
hpRange.pitch = hpRoll.pitch;
camera.lookAt(center, hpRange);
}
});
如上就是這個Demo的原始碼了，具體執行我就不展示了（csdn上傳不了這麼大的gif），還是很有趣的
我覺得註釋已經很詳細了，就不多說了，不清楚或者發現錯誤的請留言，大家一起學習
---------------------
作者：simple-soul
來源：CSDN
原文：https://blog.csdn.net/umgsoil/article/details/74923013
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