### QtSimpleEarth Hello World Example

Source: https://github.com/geo-linux-calculations/qtearth/blob/master/README.md

This C++ code snippet demonstrates how to instantiate a WorldObject, set its label and geodetic position, and add it to the WorldObjectManager for rendering in QtSimpleEarth. It requires the WorldObject and WorldObjectManager classes, and the GeodeticPosition struct.

```cpp
//instantiate world object and set label
WorldObject* worldObject = new WorldObject();
worldObject->setLabel("Hello World!");

//set world object position
GeodeticPosition position;
position.latitude = 0.0;  //in decimal degrees
position.longitude = 0.0;
position.altitude = 1.0;  //in Km
worldObject->setGeodeticPosition(position);

//add world object to manager so that it gets rendered
WorldObjectManager::getInstance()->addWorldObject(worldObject);
```

--------------------------------

### Download Satellite Imagery with SatelliteImageDownloader

Source: https://context7.com/geo-linux-calculations/qtearth/llms.txt

Fetches satellite imagery tiles from Microsoft Bing Maps for high-resolution terrain visualization. Requires the Proj4 library. This example shows how to enable web downloads, set imagery type, enable elevation mode, and manage the download thread.

```cpp
#include "SatelliteImageDownloader.h"

void demonstrateSatelliteImagery() {
    SatelliteImageDownloader* downloader = new SatelliteImageDownloader();

    // Enable web downloads
    downloader->setWebDownloadEnabled(true);

    // Set imagery type
    downloader->setImageryType(SatelliteImageDownloader::SATELLITE);
    // Options: MAP, SATELLITE, SATELLITE_WITH_ROADS

    // Enable elevation mode for terrain draping
    downloader->setElevationMode(true);

    // Start download thread
    downloader->start();

    // Stop downloader when done
    downloader->stop();
}

```

--------------------------------

### Build QtEarth Project with Make

Source: https://context7.com/geo-linux-calculations/qtearth/llms.txt

Provides instructions for building the QtEarth project using qmake and make. It outlines the basic build process and includes commented-out options for enabling features like GDAL, Proj4, and Assimp by editing the QtEarth.pro file. Finally, it shows how to run the compiled application.

```bash
# Basic build with Qt
qmake QtEarth.pro
make

# Build with optional features (edit QtEarth.pro first)
# Uncomment desired CONFIG lines:
# CONFIG += using_gdal    # For elevation databases
# CONFIG += using_proj4   # For satellite imagery
# CONFIG += using_assimp  # For 3D model loading

# Then build:
qmake QtEarth.pro
make

# Run the application
./QtEarth

```

--------------------------------

### Control Camera Navigation and View (C++)

Source: https://context7.com/geo-linux-calculations/qtearth/llms.txt

Illustrates the functionality of the Camera singleton for controlling the OpenGL camera. It covers setting positions via geodetic coordinates, animated navigation to destinations, discrete movements, and screen-based control. Dependencies include Camera.h. Inputs range from GeodeticPosition and ScreenCoordinates to camera state queries.

```cpp
#include "Camera.h"

void demonstrateCameraControl() {
    Camera* camera = Camera::getInstance();

    // Set camera position using geodetic coordinates
    GeodeticPosition cameraPos;
    cameraPos.latitude = 40.7128;
    cameraPos.longitude = -74.0060;
    cameraPos.altitude = 500.0;  // 500 Km altitude
    camera->setGeodeticPosition(cameraPos);

    // Navigate to a destination point (animated)
    GeodeticPosition destination;
    destination.latitude = 34.0522;
    destination.longitude = -118.2437;
    destination.altitude = 100.0;
    camera->moveByDestinationPoint(destination);

    // Discrete keyboard-style movements
    camera->moveByDiscrete(Camera::SHIFT_LEFT);
    camera->moveByDiscrete(Camera::SHIFT_RIGHT);
    camera->moveByDiscrete(Camera::SHIFT_UP);
    camera->moveByDiscrete(Camera::SHIFT_DOWN);
    camera->moveByDiscrete(Camera::ZOOM_IN);
    camera->moveByDiscrete(Camera::ZOOM_OUT);
    camera->moveByDiscrete(Camera::YAW_LEFT);
    camera->moveByDiscrete(Camera::YAW_RIGHT);
    camera->moveByDiscrete(Camera::PITCH_UP);
    camera->moveByDiscrete(Camera::PITCH_DOWN);

    // Mouse/touch-based movement
    ScreenCoordinates startPoint, endPoint;
    startPoint.x = 400; startPoint.y = 300;
    endPoint.x = 450; endPoint.y = 320;
    camera->moveByScreen(startPoint, endPoint);

    // Toggle orbit vs perspective mode
    camera->setCameraOrbitMove(true);   // Orbit mode (default)
    camera->setCameraOrbitMove(false);  // Perspective mode

    // Set camera yaw angle
    camera->setYaw(45.0);

    // Get current camera state
    GeodeticPosition currentPos = camera->getGeodeticPosition();
    SimpleVector lookAt = camera->getLookAt();
    SimpleVector upVector = camera->getUpVector();
    double yaw = camera->getYaw();

    // Set screen size for calculations
    ScreenCoordinates screenSize;
    screenSize.x = 1920;
    screenSize.y = 1080;
    camera->setScreenSize(screenSize);
}

```

--------------------------------

### Read and Write Data with FileIO

Source: https://context7.com/geo-linux-calculations/qtearth/llms.txt

Handles reading and writing of labels, paths, and volumes to persistent storage using the FileIO class. It supports auto-detection of file types by extension or content for reading and specific types for writing.

```cpp
#include "FileIO.h"

void demonstrateFileIO() {
    FileIO fileIO;

    // Read data file (auto-detects type by extension/content)
    fileIO.readFile("/path/to/data/labels.txt");
    fileIO.readFile("/path/to/data/paths.txt");
    fileIO.readFile("/path/to/data/volumes.txt");

    // Write labels to file
    fileIO.writeFile("/path/to/output/labels.txt", FileIO::LABELS_FILE);

    // Write paths to file
    fileIO.writeFile("/path/to/output/paths.txt", FileIO::PATHS_FILE);

    // Write volumes to file
    fileIO.writeFile("/path/to/output/volumes.txt", FileIO::VOLUMES_FILE);
}

```

--------------------------------

### Create World Object with Icon and 3D Model in QtSimpleEarth

Source: https://context7.com/geo-linux-calculations/qtearth/llms.txt

Illustrates creating a WorldObject that includes both a 2D icon and a 3D model, along with its position, rotation, and scale. This requires the Assimp library for 3D model loading. The object is configured for tracking purposes.

```cpp
#include "WorldObject.h"
#include "WorldObjectManager.h"

// Create an object with icon and 3D model
WorldObject* createIconObject() {
    WorldObject* obj = new WorldObject();
    obj->setName("AircraftTrack001");

    // Load icon (2D representation)
    obj->loadIcon(":/images/icons/fixedWingFriend.png");

    // Load 3D model (requires Assimp library)
    obj->loadModel(":/models/jeep1.3ds");

    // Set position
    GeodeticPosition position;
    position.latitude = 34.0522;
    position.longitude = -118.2437;
    position.altitude = 10.0;  // 10 Km altitude
    obj->setGeodeticPosition(position);

    // Set rotation (in degrees)
    SimpleVector rotation;
    rotation.x = -90.0;
    rotation.y = 180.0;
    rotation.z = 0.0;
    obj->setRotation(rotation);

    // Set scale
    SimpleVector scale;
    scale.x = 1.0;
    scale.y = 1.0;
    scale.z = 1.0;
    obj->setScale(scale);

    obj->setGroup(WorldObject::TRACK);
    WorldObjectManager::getInstance()->addWorldObject(obj);

    return obj;
}
```

--------------------------------

### Manage Interactive Tools with ToolManager

Source: https://context7.com/geo-linux-calculations/qtearth/llms.txt

A singleton class that manages the application's interactive tools, such as Path Tool, Volume Tool, Measuring Tool, and Label Tool. It handles tool selection, retrieval, and rendering of the currently active tool. Dependencies include ToolManager and Tool classes.

```cpp
#include "ToolManager.h"
#include "Tool.h"

void demonstrateToolManager() {
    ToolManager* toolMgr = ToolManager::getInstance();

    // Select a tool by ID
    toolMgr->selectTool("PathTool");
    toolMgr->selectTool("VolumeTool");
    toolMgr->selectTool("MeasuringTool");
    toolMgr->selectTool("LabelTool");

    // Get a specific tool
    Tool* pathTool = toolMgr->getTool("PathTool");
    if (pathTool != NULL) {
        QToolButton* button = pathTool->getToolButton();
        QDialog* dialog = pathTool->getDialog();
    }

    // Render currently selected tool (called in render loop)
    toolMgr->renderSelectedTool();
}

```

--------------------------------

### Create 3D Volume Shapes with VolumeRenderer

Source: https://context7.com/geo-linux-calculations/qtearth/llms.txt

Demonstrates creating different 3D geometric volumes (spheres, pyramids) for representing areas of interest. Requires VolumeRenderer, WorldObject, and WorldObjectManager classes. Sets volume type, position, scale, color, and attaches the renderer to a WorldObject.

```cpp
#include "VolumeRenderer.h"
#include "WorldObject.h"
#include "WorldObjectManager.h"

WorldObject* createCoverageVolume() {
    WorldObject* volumeObject = new WorldObject();
    volumeObject->setName("RadarCoverage001");
    volumeObject->setGroup(WorldObject::VOLUME);

    // Create volume renderer
    VolumeRenderer* volumeRenderer = new VolumeRenderer();

    // Set volume type: SPHERE, CUBE, or PYRAMID
    volumeRenderer->setType(VolumeRenderer::SPHERE);

    // Set volume position
    GeodeticPosition position;
    position.latitude = 38.8977;
    position.longitude = -77.0365;
    position.altitude = 0.0;
    volumeObject->setGeodeticPosition(position);

    // Set volume scale (size in Km)
    SimpleVector scale;
    scale.x = 50.0;   // 50 Km radius X
    scale.y = 50.0;   // 50 Km radius Y
    scale.z = 20.0;   // 20 Km height
    volumeObject->setScale(scale);

    // Set semi-transparent color
    SimpleColor volumeColor;
    volumeColor.red = 0.0f;
    volumeColor.green = 0.5f;
    volumeColor.blue = 1.0f;
    volumeColor.alpha = 0.3f;  // 30% opacity
    volumeObject->setColor(volumeColor);

    // Attach renderer
    volumeObject->setMeshRenderer(volumeRenderer);
    volumeRenderer->setWorldObject(volumeObject);

    WorldObjectManager::getInstance()->addWorldObject(volumeObject);
    return volumeObject;
}

WorldObject* createPyramidVolume() {
    WorldObject* volumeObject = new WorldObject();
    volumeObject->setName("SensorCone001");
    volumeObject->setGroup(WorldObject::VOLUME);

    VolumeRenderer* volumeRenderer = new VolumeRenderer();
    volumeRenderer->setType(VolumeRenderer::PYRAMID);

    GeodeticPosition position;
    position.latitude = 35.0;
    position.longitude = -100.0;
    position.altitude = 5.0;
    volumeObject->setGeodeticPosition(position);

    // Rotation for pyramid orientation
    SimpleVector rotation;
    rotation.x = 0.0;
    rotation.y = 0.0;
    rotation.z = 45.0;
    volumeObject->setRotation(rotation);

    SimpleVector scale;
    scale.x = 10.0;
    scale.y = 10.0;
    scale.z = 30.0;
    volumeObject->setScale(scale);

    volumeObject->setMeshRenderer(volumeRenderer);
    volumeRenderer->setWorldObject(volumeObject);

    WorldObjectManager::getInstance()->addWorldObject(volumeObject);
    return volumeObject;
}

```

--------------------------------

### Coordinate Conversion Functions with Utilities

Source: https://context7.com/geo-linux-calculations/qtearth/llms.txt

The Utilities class offers static functions for various coordinate system transformations, including geodetic, XYZ, DMS, ECEF, and UTM. It also handles screen-world transformations and texture creation from QImage objects. Dependencies include Qt libraries for QString and QImage.

```cpp
#include "Utilities.h"

void demonstrateUtilities() {
    // Convert geodetic to XYZ (Cartesian)
    GeodeticPosition geoPos;
    geoPos.latitude = 40.7128;
    geoPos.longitude = -74.0060;
    geoPos.altitude = 0.5;
    SimpleVector xyz = Utilities::geodeticToXYZ(geoPos);

    // Convert XYZ back to geodetic
    GeodeticPosition converted = Utilities::xyzToGeodetic(xyz);

    // Convert decimal degrees to DMS string
    QString latDMS = Utilities::decimalDegreesToDMS(40.7128, true);   // "40° 42' 46.08" N"
    QString lonDMS = Utilities::decimalDegreesToDMS(-74.0060, false); // "74° 0' 21.6" W"

    // Convert DMS string to decimal degrees
    double decimalLat = Utilities::dmsToDecimalDegrees("40° 42' 46.08" N");

    // Convert ECEF to geodetic
    SimpleVector ecef;
    ecef.x = 1334.0;
    ecef.y = -4654.0;
    ecef.z = 4138.0;
    GeodeticPosition fromEcef = Utilities::ecefToGeodetic(ecef);

    // Convert UTM to geodetic
    GeodeticPosition fromUtm = Utilities::utmToGeodetic("18T 583960 4507523");

    // Screen to world coordinate conversion
    ScreenCoordinates screenPos;
    screenPos.x = 500;
    screenPos.y = 400;
    SimpleVector worldPos = Utilities::screenToWorld(screenPos);

    // World to screen coordinate conversion
    SimpleVector worldCoord;
    worldCoord.x = 100.0;
    worldCoord.y = 200.0;
    worldCoord.z = 50.0;
    SimpleVector screenCoord = Utilities::worldToScreen(worldCoord);

    // Check if object is obscured by Earth
    GeodeticPosition camPos, objPos;
    camPos.latitude = 40.0; camPos.longitude = -74.0; camPos.altitude = 100.0;
    objPos.latitude = -40.0; objPos.longitude = 106.0; objPos.altitude = 0.0;
    bool isObscured = Utilities::checkObscure(camPos, objPos);

    // Convert QImage to OpenGL texture
    QImage image(":/images/icons/icon.jpg");
    unsigned int textureId = Utilities::imageToTexture(image);
}
```

--------------------------------

### Simulate Flying Object with Qt Thread

Source: https://context7.com/geo-linux-calculations/qtearth/llms.txt

Demonstrates a complete threaded simulation of an object flying around the equator. It utilizes Qt's threading capabilities to update the object's position in real-time. The simulation creates a WorldObject, assigns an icon and 3D model, sets its initial geodetic position and rotation, and then enters a loop to update its longitude, simulating flight.

```cpp
#include <QThread>
#include "WorldObject.h"
#include "WorldObjectManager.h"

class FlyingObjectSimulation : public QThread {
public:
    void run() override {
        // Create world object with icon and model
        WorldObject* aircraft = new WorldObject();
        aircraft->setName("SimulatedAircraft");
        aircraft->loadIcon(":/images/icons/fixedWingFriend.png");
        aircraft->loadModel(":/models/jeep1.3ds");

        // Initial position and orientation
        GeodeticPosition position;
        position.latitude = 0.0;
        position.longitude = 0.0;
        position.altitude = 10.0;
        aircraft->setGeodeticPosition(position);

        SimpleVector rotation;
        rotation.x = -90.0;
        rotation.y = 180.0;
        rotation.z = 0.0;
        aircraft->setRotation(rotation);

        // Add to scene
        WorldObjectManager::getInstance()->addWorldObject(aircraft);

        // Animation loop (10 updates per second)
        while (true) {
            // Update longitude
            position.longitude += 0.01;
            if (position.longitude > 180.0) {
                position.longitude -= 360.0;
            }
            aircraft->setGeodeticPosition(position);

            msleep(100);
        }
    }
};

// Usage:
// FlyingObjectSimulation* sim = new FlyingObjectSimulation();
// sim->start();

```

--------------------------------

### Manage World Objects with WorldObjectManager (C++)

Source: https://context7.com/geo-linux-calculations/qtearth/llms.txt

Demonstrates the usage of WorldObjectManager, a singleton class for managing the lifecycle of WorldObjects. It covers adding, retrieving, finding, and removing objects by name or index. Dependencies include WorldObjectManager.h and WorldObject.h. The input is WorldObject pointers and names, with operations returning success status or pointers to objects.

```cpp
#include "WorldObjectManager.h"
#include "WorldObject.h"

void demonstrateWorldObjectManager() {
    // Get singleton instance
    WorldObjectManager* manager = WorldObjectManager::getInstance();

    // Add a new object
    WorldObject* obj = new WorldObject();
    obj->setName("TrackedVehicle01");
    obj->loadIcon(":/images/icons/groundVehicleFriend.png");

    GeodeticPosition pos;
    pos.latitude = 48.8566;
    pos.longitude = 2.3522;
    pos.altitude = 0.1;
    obj->setGeodeticPosition(pos);

    bool success = manager->addWorldObject(obj);

    // Retrieve object by name
    WorldObject* retrieved = manager->getWorldObject("TrackedVehicle01");
    if (retrieved != NULL) {
        // Update position
        GeodeticPosition newPos = retrieved->getGeodeticPosition();
        newPos.longitude += 0.01;
        retrieved->setGeodeticPosition(newPos);

        // Reset expiration timer if expirable
        if (retrieved->getIsExpirable()) {
            retrieved->setExpirationTime(5);
        }
    }

    // Retrieve object by index
    int count = manager->getNumberOfObjects();
    for (int i = 0; i < count; i++) {
        WorldObject* item = manager->getWorldObject(i);
        if (item != NULL && item->getIsVisible()) {
            // Process visible objects
        }
    }

    // Find object index by name
    int index = manager->findWorldObject("TrackedVehicle01");
    if (index >= 0) {
        // Object found at index
    }

    // Remove object by name
    manager->removeWorldObject("TrackedVehicle01");

    // Remove object by index
    manager->removeWorldObject(0);
}

```

--------------------------------

### Create Labeled World Object in QtSimpleEarth

Source: https://context7.com/geo-linux-calculations/qtearth/llms.txt

Demonstrates how to create a basic WorldObject with a name, label, type, geodetic position, and color. The object is then added to the WorldObjectManager for rendering on the globe. This is a fundamental operation for placing markers or points of interest.

```cpp
#include "WorldObject.h"
#include "WorldObjectManager.h"

// Create a basic labeled world object
WorldObject* createLabeledObject() {
    WorldObject* obj = new WorldObject();

    // Set identifying properties
    obj->setName("MyUniqueObject");
    obj->setLabel("Hello World!");
    obj->setType("marker");

    // Set geodetic position
    GeodeticPosition position;
    position.latitude = 38.8977;   // Washington DC
    position.longitude = -77.0365;
    position.altitude = 1.0;       // 1 Km above ground
    obj->setGeodeticPosition(position);

    // Set color (RGBA)
    SimpleColor color;
    color.red = 0.0f;
    color.green = 1.0f;
    color.blue = 0.0f;
    color.alpha = 1.0f;
    obj->setColor(color);

    // Set visibility
    obj->setIsVisible(true);
    obj->setIsClickable(true);

    // Assign to a group
    obj->setGroup(WorldObject::LABEL);

    // Add to manager for rendering
    WorldObjectManager::getInstance()->addWorldObject(obj);

    return obj;
}
```

--------------------------------

### Create Flight Paths with PathRenderer

Source: https://context7.com/geo-linux-calculations/qtearth/llms.txt

The PathRenderer class is used to generate visual representations of line paths connecting multiple geographic points. These paths can signify flight routes, boundaries, or historical tracks. It utilizes the Utilities class for coordinate conversions and integrates with WorldObject and WorldObjectManager.

```cpp
#include "PathRenderer.h"
#include "WorldObject.h"
#include "WorldObjectManager.h"
#include "Utilities.h"

WorldObject* createFlightPath() {
    WorldObject* pathObject = new WorldObject();
    pathObject->setName("FlightRoute001");
    pathObject->setGroup(WorldObject::PATH);

    // Create path renderer
    PathRenderer* pathRenderer = new PathRenderer();

    // Add waypoints (converted from geodetic to XYZ)
    GeodeticPosition waypoint1, waypoint2, waypoint3;

    waypoint1.latitude = 40.6413;   // JFK Airport
    waypoint1.longitude = -73.7781;
    waypoint1.altitude = 10.0;

    waypoint2.latitude = 41.9742;   // Chicago O'Hare
    waypoint2.longitude = -87.9073;
    waypoint2.altitude = 12.0;

    waypoint3.latitude = 33.9425;   // LAX
    waypoint3.longitude = -118.4081;
    waypoint3.altitude = 10.0;

    pathRenderer->addPoint(Utilities::geodeticToXYZ(waypoint1));
    pathRenderer->addPoint(Utilities::geodeticToXYZ(waypoint2));
    pathRenderer->addPoint(Utilities::geodeticToXYZ(waypoint3));

    // Set path color
    SimpleColor pathColor;
    pathColor.red = 1.0f;
    pathColor.green = 0.0f;
    pathColor.blue = 0.0f;
    pathColor.alpha = 1.0f;
    pathObject->setColor(pathColor);

    // Attach renderer to object
    pathObject->setMeshRenderer(pathRenderer);
    pathRenderer->setWorldObject(pathObject);

    // Set position at first waypoint
    pathObject->setGeodeticPosition(waypoint1);

    WorldObjectManager::getInstance()->addWorldObject(pathObject);
    return pathObject;
}
```

--------------------------------

### Load and Query Elevation Data with ElevationManager

Source: https://context7.com/geo-linux-calculations/qtearth/llms.txt

The ElevationManager class facilitates loading and querying digital terrain elevation data using the GDAL library. It requires a path to a DEM (Digital Elevation Model) file as input and can then provide elevation values for specific geographic coordinates.

```cpp
#include "ElevationManager.h"

void demonstrateElevationManager() {
    ElevationManager* elevMgr = ElevationManager::getInstance();

    // Load elevation database (requires GDAL)
    elevMgr->loadElevationDatabase("/path/to/elevation/dem.tif");

    // Query elevation at specific coordinates
    double latitude = 39.7392;   // Denver, CO
    double longitude = -104.9903;

    float elevation = elevMgr->getElevation(latitude, longitude);
    // Returns elevation in Km

    // Use elevation for terrain-following objects
    WorldObject* groundVehicle = new WorldObject();
    groundVehicle->setName("GroundVehicle");

    GeodeticPosition pos;
    pos.latitude = latitude;
    pos.longitude = longitude;
    pos.altitude = elevation + 0.001;  // 1 meter above terrain
    groundVehicle->setGeodeticPosition(pos);
}
```

--------------------------------

### Create Expirable World Object in QtSimpleEarth

Source: https://context7.com/geo-linux-calculations/qtearth/llms.txt

Shows how to create a WorldObject that is set to expire automatically after a specified time. This is useful for temporary markers or transient events displayed on the globe. The object is configured with an icon and position before being added to the manager.

```cpp
#include "WorldObject.h"
#include "WorldObjectManager.h"

// Create an expirable object (auto-removes after timeout)
WorldObject* createExpirableObject() {
    WorldObject* obj = new WorldObject();
    obj->setName("TemporaryMarker");
    obj->loadIcon(":/images/icons/unknown.png");

    GeodeticPosition position;
    position.latitude = 51.5074;
    position.longitude = -0.1278;
    position.altitude = 5.0;
    obj->setGeodeticPosition(position);

    // Enable expiration
    obj->setIsExpirable(true);
    obj->setExpirationTime(5);  // Expires after 5 seconds

    WorldObjectManager::getInstance()->addWorldObject(obj);
    return obj;
}
```

--------------------------------

### Define Core Data Structures for QtSimpleEarth

Source: https://context7.com/geo-linux-calculations/qtearth/llms.txt

Defines fundamental data structures for representing 3D positions, geodetic coordinates, screen coordinates, and RGBA colors within the QtSimpleEarth application. These structures are essential for all spatial and visual data handling.

```cpp
#include "globals.h"

// 3D position vector (x, y, z in Km)
SimpleVector position;
position.x = 100.0;
position.y = 200.0;
position.z = 50.0;

// Geodetic position (latitude/longitude in decimal degrees, altitude in Km)
GeodeticPosition geoPos;
geoPos.latitude = 40.7128;   // New York latitude
geoPos.longitude = -74.0060; // New York longitude
geoPos.altitude = 0.5;       // 500 meters above ground

// Screen coordinates (pixels)
ScreenCoordinates screen;
screen.x = 800;
screen.y = 600;

// RGBA color (floating point 0.0-1.0)
SimpleColor color;
color.red = 1.0f;
color.green = 0.5f;
color.blue = 0.0f;
color.alpha = 1.0f;
```

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