cesium之直線類型

`
var viewer = new Cesium.Viewer("cesiumContainer", {
// 加入世界地形數據
terrainProvider: Cesium.createWorldTerrain({
requestWaterMask: true,
requestVertexNormals: true
}),
});

		var redLine = viewer.entities.add({
			// 貼在地面上 兩點之間的直線距離
			name: "Red_line on terrain",
			polyline: {
				positions: Cesium.Cartesian3.fromDegreesArray([-75, 35, -125, 35]),
				width: 10,
				// 不帶箭頭的線
				// material: Cesium.Color.RED,
				// 是否緊貼地面
				clampToGround: true,
				// 帶箭頭的線
				material: new Cesium.PolylineArrowMaterialProperty(
					Cesium.Color.RED
				),
			},
		});

		var greenRhumbLine = viewer.entities.add({
			name: "Green rhumb line",
			polyline: {
				positions: Cesium.Cartesian3.fromDegreesArray([-75, 35, -125, 35]),
				width: 5,
				// arcType:多段線線段必須遵循的直線類型。
				// NONE:不符合橢球表面的直線。
				// GEODESIC:沿測地線路徑。
				// RHUMB:沿着直角或斜線路徑。
				arcType: Cesium.ArcType.RHUMB,
				material: Cesium.Color.GREEN,
			},
		});

		var glowingLine = viewer.entities.add({
			name: "Glowing blue line on the surface",
			polyline: {
				positions: Cesium.Cartesian3.fromDegreesArray([-75, 37, -125, 37]),
				width: 10,
				material: new Cesium.PolylineGlowMaterialProperty({
					// 指定輝光強度的數字屬性，以總線寬的百分比表示。
					glowPower: 0.7,
					// 一種數字特性，指定漸變效果的強度，以占總線條長度的百分比表示。如果為1.0或更高，則不使用錐度效果。
					taperPower: 0.6,
					color: Cesium.Color.RED,
				}),
			},
		});

		var orangeOutlined = viewer.entities.add({
			name: "Orange line with black outline at height and following the surface",
			polyline: {
				positions: Cesium.Cartesian3.fromDegreesArrayHeights([
					-75, 39, 250000,
					-125, 39, 250000,
				]),
				width: 5,
				// arcType: Cesium.ArcType.RHUMB,
				// arcType: Cesium.ArcType.GEODESIC,
				material: new Cesium.PolylineOutlineMaterialProperty({
					color: Cesium.Color.ORANGE,
					outlineWidth: 2,
					outlineColor: Cesium.Color.BLACK,
				}),
			},
		});

		var purpleArrow = viewer.entities.add({
			name: "Purple straight arrow at height",
			polyline: {
				positions: Cesium.Cartesian3.fromDegreesArrayHeights([
					-75, 43, 500000,
					-125, 43, 500000,
				]),
				width: 10,
				arcType: Cesium.ArcType.NONE,
				// 帶箭頭的直線
				// material: new Cesium.PolylineArrowMaterialProperty(
				// 	Cesium.Color.PURPLE
				// ),
				// 不帶箭頭的直線
				material: Cesium.Color.PURPLE
				
			},
		});

		var dashedLine = viewer.entities.add({
			name: "Blue dashed line",
			polyline: {
				positions: Cesium.Cartesian3.fromDegreesArrayHeights([
					-75, 45, 500000,
					-125, 45, 500000,
				]),
				width: 4,
				// 普通的直線
				// PolylineGlowMaterialProperty
				// 虛線
				// PolylineDashMaterialProperty
				// 多段線輪廓材質屬性
				// PolylineOutlineMaterialProperty
				material: new Cesium.PolylineOutlineMaterialProperty({
					color: Cesium.Color.CYAN,
				}),
			},
		});

		viewer.zoomTo(viewer.entities);`