Cesium学习笔记（七）：Demo学习（自由控制飞行的飞机）[转]
https://blog.csdn.net/umgsoil/article/details/74923013#
这是官方的教程Demo，名字叫Use HeadingPitchRoll，顾名思义，就是教你用HeadingPitchRoll这个方法的，下面我们就来看一看这个Demo
首先先说一下，这个Demo是沙盒里面的，所以如果你想在本地运行的话需要改一下html
这里是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>
<!-- 如果要用沙盒里的东西的话加上这个 -->
<script src="../Apps/Sandcastle/Sandcastle-header.js"></script>
<!-- 一定要加上这个css样式 -->
<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">
<!-- 这是Demo需要的侧边栏 -->
<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文件"></script>
</body>
</html>
这是js代码
//飞机飞行
var canvas = viewer.canvas;
canvas.setAttribute('tabindex', '0'); // 将焦点放在画布上
//如果点击就获取画布焦点
canvas.addEventListener('click', function() {
canvas.focus();
});
canvas.focus();
//飞行路径的位置
var pathPosition = new Cesium.SampledPositionProperty();
//添加飞机飞行路径
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;
//中心点
var center = new Cesium.Cartesian3();
//机身模型的偏移参数
var hpRoll = new Cesium.HeadingPitchRoll();
//相机模型的偏移参数
var hpRange = new Cesium.HeadingPitchRange();
var speed = 10;
//默认按一下偏移3度
var deltaRadians = Cesium.Math.toRadians(3.0);
//飞机位置
var position = Cesium.Cartesian3.fromDegrees(-123.0744619, 44.0503706, 5000.0);
//速度向量
var speedVector = new Cesium.Cartesian3();
//生成一个由两个参考系生成的矩阵
var fixedFrameTransform = Cesium.Transforms.localFrameToFixedFrameGenerator('north', 'west');
//添加模型
var planePrimitive = scene.primitives.add(Cesium.Model.fromGltf({
//这里需要把模型路径改下(如果你用的还是HelloWord.html的话就用这个,不是的话请自行修改)
url : '../Apps/SampleData/models/CesiumAir/Cesium_Air.glb',
modelMatrix : Cesium.Transforms.headingPitchRollToFixedFrame(position, hpRoll, Cesium.Ellipsoid.WGS84, fixedFrameTransform),
minimumPixelSize : 128
}));
//动画播放
planePrimitive.readyPromise.then(function(model) {
// 以半速循环动画
model.activeAnimations.addAll({
speedup : 0.5,
loop : Cesium.ModelAnimationLoop.REPEAT
});
//r=2*max(模型的半径，相机的最近距离)
r = 2.0 * Math.max(model.boundingSphere.radius, camera.frustum.near);
//镜头最近距离
controller.minimumZoomDistance = r * 0.5;
//计算center位置(也为下面的镜头跟随提供了center位置)
Cesium.Matrix4.multiplyByPoint(model.modelMatrix, model.boundingSphere.center, center);
//相机偏移角度
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;
//固定相机
camera.lookAt(center, hpRange);
});
//键盘监听
document.addEventListener('keydown', function(e) {
switch (e.keyCode) {
case 40:
if (e.shiftKey) {
// 按住shift加下箭头减速
speed = Math.max(--speed, 1);
} else {
// 直接按下箭头降低角度
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加上箭头加速
speed = Math.min(++speed, 100);
} else {
// 直接按上箭头抬高角度
hpRoll.pitch += deltaRadians;
if (hpRoll.pitch > Cesium.Math.TWO_PI) {
hpRoll.pitch -= Cesium.Math.TWO_PI;
}
}
break;
case 39:
if (e.shiftKey) {
// 飞机本身向右旋转
hpRoll.roll += deltaRadians;
if (hpRoll.roll > Cesium.Math.TWO_PI) {
hpRoll.roll -= Cesium.Math.TWO_PI;
}
} else {
// 向右飞行
hpRoll.heading += deltaRadians;
if (hpRoll.heading > Cesium.Math.TWO_PI) {
hpRoll.heading -= Cesium.Math.TWO_PI;
}
}
break;
case 37:
if (e.shiftKey) {
// 飞机本身向左旋转
hpRoll.roll -= deltaRadians;
if (hpRoll.roll < 0.0) {
hpRoll.roll += Cesium.Math.TWO_PI;
}
} else {
// 向左飞行
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');
//给左边的通知栏更新数据同时刷新飞机位置(这里也是个1ms一次的回调)
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);
//选择的笛卡尔分量Cartesian3.UNIT_X（x轴单位长度）乘以一个标量speed/10，得到速度向量speedVector
speedVector = Cesium.Cartesian3.multiplyByScalar(Cesium.Cartesian3.UNIT_X, speed / 10, speedVector);
//飞机的模型矩阵与速度向量speedVector相乘，得到position
position = Cesium.Matrix4.multiplyByPoint(planePrimitive.modelMatrix, speedVector, position);
//添加一个路径模型(就是白色的尾气)
pathPosition.addSample(Cesium.JulianDate.now(), position);
//飞机位置+旋转角度+地球+坐标矩阵=飞机模型矩阵
Cesium.Transforms.headingPitchRollToFixedFrame(position, hpRoll, Cesium.Ellipsoid.WGS84, fixedFrameTransform, planePrimitive.modelMatrix);
if (fromBehind.checked) {
// 镜头跟随
Cesium.Matrix4.multiplyByPoint(planePrimitive.modelMatrix, planePrimitive.boundingSphere.center, center);
hpRange.heading = hpRoll.heading;
hpRange.pitch = hpRoll.pitch;
camera.lookAt(center, hpRange);
}
});
如上就是这个Demo的源码了，具体运行我就不展示了（csdn上传不了这么大的gif），还是很有趣的
我觉得注释已经很详细了，就不多说了，不清楚或者发现错误的请留言，大家一起学习
---------------------
作者：simple-soul
来源：CSDN
原文：https://blog.csdn.net/umgsoil/article/details/74923013
版权声明：本文为博主原创文章，转载请附上博文链接！
