cesium 漫游飞行

cesium 漫游飞行

思路：

1、获取当前相机位置  P1

2、获取屏幕中心点位置 P2

3、计算亮点的经度差和纬度差

4、飞行的目标减去dx、dy

注： 当飞行前后高度变化时，此方法不适用，需另外计算比例。

var p = viewer.camera._positionCartographic

var left = $('#cesiumContainer').offset().left

var top = $('#cesiumContainer').offset().top

var width = parseFloat($('#cesiumContainer').css('width').split('px')[0])

var height = parseFloat($('#cesiumContainer').css('height').split('px')[0])

var x = left + width / 2

var y = top + height / 2

var _center = new Cesium.Cartesian2(x, y);

var __center = viewer.scene.globe.pick(PickRay(_center), viewer.scene);

var center = viewer.scene.globe.ellipsoid.cartesianToCartographic(__center);

dx = (center.longitude - p.longitude) / Math.PI * 180

dy = (center.latitude - p.latitude) / Math.PI * 180

var heading = viewer.camera.heading

var pitch = viewer.camera.pitch

var height = p.height

viewer.camera.flyTo({

destination: Cesium.Cartesian3.fromDegrees(116.4997625442 - dx, 39.9843650681 - dy, height ),

orientation: {

heading: heading ,

pitch: pitch

}

})