一:基本实体对象

1.示例代码

                                        
//定义一个观察者对象
var viewer = new Cesium.Viewer('cesiumContainer');
//定义一个polygon实体
var polygon=new Cesium.Entity({
	name:'polygonEntity',
	polygon : {
		hierarchy : Cesium.Cartesian3.fromDegreesArray(
			[
				112,36,  // lontitude,lantitude
				112,33,
				119,32
			]),
		height : 500000,//多边形高度
		material : Cesium.Color.RED.withAlpha(1),//红色不透明
		outline : true,
		outlineColor : Cesium.Color.ORANGE//橘色轮廓线
	}
	});
//定义一个box实体
var box=new Cesium.Entity({
	name : 'BLUE  box with black outline',
	position: Cesium.Cartesian3.fromDegrees(116.423241,39.920026, 600000.0), //(lon,lan,h)
	box : {
		dimensions : new Cesium.Cartesian3(900000.0, 300000.0, 500000.0), // (x,y,z)
		material : Cesium.Color.BLUE .withAlpha(0.5),//蓝色半透明
		outline : true,
		outlineColor : Cesium.Color.RED //红色轮廓线
	}
});
//定义一个Cylinder圆柱体
var Cylinder = viewer.entities.add({
	name : 'Green cylinder with black outline',
	position: Cesium.Cartesian3.fromDegrees(106.423241,39.920026, 200000.0),
	cylinder : {
		length : 400000.0,
		topRadius : 200000.0,//圆柱体的顶部半径。
		bottomRadius : 200000.0,//圆柱体底部的半径。
		material : Cesium.Color.GREEN.withAlpha(0.5),//绿色半透明
		outline : true,//轮廓
		outlineColor : Cesium.Color.DARK_GREEN//轮廓颜色深绿色
	}
});
//红色圆锥体
var redCone = viewer.entities.add({
	name : 'Red cone',
	position: Cesium.Cartesian3.fromDegrees(116.423241,43.920026, 200000.0),
	cylinder : {
		length : 400000.0,
		topRadius : 0.0,
		bottomRadius : 200000.0,
		material : Cesium.Color.RED
	}
});
viewer.entities.add(polygon);
viewer.entities.add(box);
viewer.entities.add(Cylinder);
viewer.entities.add(redCone);
viewer.zoomTo(viewer.entities);
                                        
                                    

2.效果

二:不规则实体类型

1.在这里介绍两种不规则实体

2.代码实例

                                        
var orangePolygon = viewer.entities.add({//橙色多边形
    name : 'Orange polygon with per-position heights and outline',
    polygon : {
        hierarchy : Cesium.Cartesian3.fromDegreesArrayHeights([-108.0, 25.0, 100000, 这里无非给二位的多边形加了高度，形成三维效果
                                                               -100.0, 25.0, 100000,
                                                               -100.0, 30.0, 100000,
                                                               -108.0, 30.0, 300000]),
        extrudedHeight: 0,//多边形的挤出面和椭圆面之间的距离（以米为单位）。
        perPositionHeight : true,//对每个位置使用options.positions的height，而不使用options.height来确定高度
        material : Cesium.Color.ORANGE.withAlpha(0.5),//橘色半透明
        outline : true,
        outlineColor : Cesium.Color.BLACK//黑色轮廓线
    }
});
var bluePolygon = viewer.entities.add({//蓝色多边形
    name : 'Blue polygon with holes and outline',
    polygon : {
        hierarchy : {
            positions : Cesium.Cartesian3.fromDegreesArray([-99.0, 30.0,
                                                            -85.0, 30.0,
                                                            -85.0, 40.0,
                                                            -99.0, 40.0]),
            holes : [{//内一层洞多边形
                positions : Cesium.Cartesian3.fromDegreesArray([
                    -97.0, 31.0,
                    -97.0, 39.0,
                    -87.0, 39.0,
                    -87.0, 31.0
                ]),
                holes : [{//内二层洞多边形
                    positions : Cesium.Cartesian3.fromDegreesArray([
                        -95.0, 33.0,
                        -89.0, 33.0,
                        -89.0, 37.0,
                        -95.0, 37.0
                    ]),
                    holes : [{//内三层洞多边形
                        positions : Cesium.Cartesian3.fromDegreesArray([
                            -93.0, 34.0,
                            -91.0, 34.0,
                            -91.0, 36.0,
                            -93.0, 36.0
                        ])
                    }],
                }]
            }]
        },
        material : Cesium.Color.RED.withAlpha(0.5),
        outline : true,
        outlineColor : Cesium.Color.GREEN
    }
});
                                        
                                    

3.效果图