【cesium-4】cesium空间数据加载与管理

目录

一、cesium空间数据加载?

1、cesium画线

2、cesium绘制矩形

3、cesium绘制平面?

4、飞机模型加载

5、标签加载

6、cesium绘制多边形

二、cesium空间数据管理

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一、cesium空间数据加载?

空间数据包括：
矢量数据：几何体、模型、标签等；
栅格数据：地形、地图等。

1、cesium画线

var viewer = new Cesium.Viewer('cesiumContainer', {
        animation: false,
        timeline: false
    });

var positions = [];
for (var i = 0; i < 40; ++i) {
    positions.push(Cesium.Cartesian3.fromDegrees(-100.0 + i, 15.0));
}
const entity = viewer.entities.add({
    polyline: {
        positions: positions,
        width: 10.0,
        material: new Cesium.PolylineGlowMaterialProperty({
            color: Cesium.Color.DEEPSKYBLUE,
            glowPower: 0.25,
        }),
    },
});

2、cesium绘制矩形

var viewer = new Cesium.Viewer('cesiumContainer', {
        animation: false,
        timeline: false
});

var position = new Cesium.Cartesian3.fromDegrees(116.39, 38.9, 0.0);

const entity = viewer.entities.add({
    position:position,
    rectangle: {
        coordinates: Cesium.Rectangle.fromDegrees(-92.0, 20.0, -86.0, 27.0),
        //outline: true,
        outlineColor: Cesium.Color.WHITE,
        outlineWidth: 4,
        stRotation: Cesium.Math.toRadians(45),
        material: Cesium.Color.RED.withAlpha(0.5),
    },
});

viewer.trackedEntity = entity;

3、cesium绘制平面?

var viewer = new Cesium.Viewer('cesiumContainer', {
        animation: false,
        timeline: false
});
  
var position = new Cesium.Cartesian3.fromDegrees(116.39, 38.9, 0.0);
const entity = viewer.entities.add({
    position: position,
    plane: {
        plane: new Cesium.Plane(Cesium.Cartesian3.UNIT_Z, 0.0),
        dimensions: new Cesium.Cartesian2(400, 300),
        material: Cesium.Color.RED.withAlpha(0.5),
        outline: true,
        outlineColor: Cesium.Color.BLACK
    },
}) 
viewer.trackedEntity = entity;  //将摄像机视口快速绑定到模型位置 

将图片插入面中：修改material属性值。

material: "../testdata/test.png",

将图片竖起来：修改plane值。

plane: new Cesium.Plane(Cesium.Cartesian3.UNIT_X, 0.0),

4、飞机模型加载

Cesium.Ion.defaultAccessToken = '';

var viewer = new Cesium.Viewer('cesiumContainer', {
        animation: false,
        timeline: false
});

var position = new Cesium.Cartesian3.fromDegrees(116.39, 38.9, 400.0);

//glb模型的加载
var orientation = Cesium.Transforms.headingPitchRollQuaternion(position, new Cesium.HeadingPitchRoll(-90,0,0));
var entity = viewer.entities.add({
    position:position,
    orientation:orientation,  //设置飞机的朝向和翻滚角度
    model:{
        uri:"../testdata/Cesium_Air.glb",
        minimumPixelSize:100,
        maximumScale:10000,
        show:true
    }
});
viewer.trackedEntity = entity;  //将摄像机视口快速绑定到模型位置

5、标签加载

将文字加载到标签中，通过cesium生成的标签，无论如何旋转视角，文字都是朝向屏幕的

var viewer = new Cesium.Viewer('cesiumContainer', {
        animation: false,
        timeline: false
});

//对齐和缩放也不会影响文字的大小
const entity = viewer.entities.add({
    position: new Cesium.Cartesian3.fromDegrees(116.39, 39.915, 0),
    label: {
        text: "cesium学习",  //设置文字内容
        font: "50px Helvetica",  //设置文字大小和样式
        fillColor: Cesium.Color.SKYBLUE,  //设置文字的颜色
    },
}) 
viewer.trackedEntity = entity;  //将摄像机视口快速绑定到模型位置 

6、cesium绘制多边形

var viewer = new Cesium.Viewer('cesiumContainer', {
        animation: false,
        timeline: false
});  
var position = new Cesium.Cartesian3.fromDegrees(116.39, 38.9, 0.0);
var entity = viewer.entities.add({
    position: position,
    polygon: {
        hierarchy: Cesium.Cartesian3.fromDegreesArray([116.39,39.91,116.39,39.915,116.395,39.91]),
        material:Cesium.Color.PURPLE,
        extrudedHeight:10
    }
}) 
viewer.trackedEntity = entity;  //将摄像机视口快速绑定到模型位置 

通过设置extrudedHeight属性值，可对多边形进行拉伸，如果创建的是plane，则不可进行拉伸。

二、cesium空间数据管理

空间数据的管理包括增、删、改。

增加：add();

删除：remove()；

全部删除：removeAll()；

修改：getById()。

var viewer = new Cesium.Viewer('cesiumContainer', {
        animation: false,
        timeline: false
});  
var position = new Cesium.Cartesian3.fromDegrees(116.39, 38.9, 0.0);
var entity = viewer.entities.add({
    id:'BlueModel',
    position: position,
    polygon: {
        hierarchy: Cesium.Cartesian3.fromDegreesArray([116.39,39.91,116.39,39.915,116.395,39.91]),
        material:Cesium.Color.PURPLE,
        extrudedHeight:10
    }
}) 
viewer.trackedEntity = entity;  //将摄像机视口快速绑定到模型位置 
viewer.entities.getById('BlueModel').polygon.material = Cesium.Color.RED;  

参考链接?【Cesium】绘制线、面、体_cesium 绘制-CSDN博客