本节演示添加billboard小旗子，使用第四节click的例子，通过鼠标点击地图添加billboard添加小旗子。

1、修改鼠标点击事件mouseUp，在函数中创建BillboardCollection对象并添加到地图中。鼠标点击时获取鼠标位置，转换成经纬度然后添加billboard。

static void mouseUp(void *handler, Cesium::ScreenEvent *event) {Handler *aggregator = (Handler *) handler;if (aggregator->billboards == NULL) {// 创建BillboardCollectionaggregator->billboards = new Cesium::BillboardCollection(NULL);aggregator->viewer->_scene->primitives()->add(aggregator->billboards);}glm::dvec2 position = event->position;//鼠标屏幕位置glm::dvec3 coor, carthposition;//转换成经纬度，与cesium基本一致aggregator->viewer->_scene->_camera->pickEllipsoid(position,aggregator->viewer->_scene->_globe->_ellipsoid,&coor);aggregator->viewer->_scene->_globe->_ellipsoid->cartesianToCartographic(coor, &carthposition);double longitude = Cesium::CesiumMath::toDegrees(carthposition.x);double latitude = Cesium::CesiumMath::toDegrees(carthposition.y);//添加billboardglm::dvec3 initialPosition2 = Cesium::Cartesian3::fromDegrees(longitude, latitude);aggregator->billboards->add(initialPosition2, "../data/home.png");}

2、运行地图，点击地图即可添加一个billboard。

完整代码

/*** Created by IBM on 2021/3/3.*/
#include <iostream>
#include <Widgets/Viewer/Viewer.h>
#include <Scene/BillboardCollection.h>class Handler {
public:Cesium::Viewer *viewer;Cesium::BillboardCollection *billboards = NULL;/*** 鼠标抬起事件* @param type* @param position*/static void mouseUp(void *handler, Cesium::ScreenEvent *event) {Handler *aggregator = (Handler *) handler;if (aggregator->billboards == NULL) {// 创建BillboardCollectionaggregator->billboards = new Cesium::BillboardCollection(NULL);aggregator->viewer->_scene->primitives()->add(aggregator->billboards);}glm::dvec2 position = event->position;//鼠标屏幕位置glm::dvec3 coor, carthposition;//转换成经纬度，与cesium基本一致aggregator->viewer->_scene->_camera->pickEllipsoid(position,aggregator->viewer->_scene->_globe->_ellipsoid,&coor);aggregator->viewer->_scene->_globe->_ellipsoid->cartesianToCartographic(coor, &carthposition);double longitude = Cesium::CesiumMath::toDegrees(carthposition.x);double latitude = Cesium::CesiumMath::toDegrees(carthposition.y);//添加billboardglm::dvec3 initialPosition2 = Cesium::Cartesian3::fromDegrees(longitude, latitude);aggregator->billboards->add(initialPosition2, "../data/home.png");}
};int main(int argc, char *argv[]) {Handler *handler = new Handler();Cesium::Viewer viewer = Cesium::Viewer(500, 300);handler->viewer = &viewer;std::string url = "https://dev.virtualearth.net";std::string key = "AmXdbd8UeUJtaRSn7yVwyXgQlBBUqliLbHpgn2c76DfuHwAXfRrgS5qwfHU6Rhm8";Cesium::BingMapsImageryProvider *imageryProvider1 = new Cesium::BingMapsImageryProvider(url, key);viewer.imageryLayers()->addImageryProvider(imageryProvider1);//创建事件Cesium::ScreenSpaceEventHandler *_eventHandler = new Cesium::ScreenSpaceEventHandler(handler);_eventHandler->setInputAction(&Handler::mouseUp, Cesium::ScreenSpaceEventType::LEFT_CLICK);//设置鼠标点击事件viewer.startAnimating(true);//启动opengl循环system("pause");return 0;
}

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