9、加载cesium世界地形

        本节演示使用CCsium库加载cesium的世界地形，使用第四节单击事件的例子，修改点击事件添加地形。

1、ceisum显示地形需要引入CesiumTerrainProvider和CreateWorldTerrain类。与ceisum类似，修改鼠标点击事件，创建地形并添加到ceisum中。

if (aggregator->terrain == NULL) {
    aggregator->terrain = Cesium::CreateWorldTerrain::createWorldTerrain();
    aggregator->viewer->terrainProvider(aggregator->terrain);
}

支持地形下载

2、点击运行，左键单击即可看到地形

完整代码

/**
 * Created by IBM on 2021/3/3.
 */
#include 
#include 
#include 
#include 



class Handler {
public:
    Cesium::Viewer *viewer;
    Cesium::CesiumTerrainProvider *terrain = 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->terrain == NULL) {
            aggregator->terrain = Cesium::CreateWorldTerrain::createWorldTerrain();
            aggregator->viewer->terrainProvider(aggregator->terrain);
        }
    }
};

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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