Improve comments

c++/main.cpp

@@ -22,6 +22,7 @@ QString getFileUrlRelativeToExecutable(const QString &relativeFilePath) {
 int main(int argc, char *argv[])
 {
     QGuiApplication gui_app(argc, argv);
+    QQmlApplicationEngine engine;
 
     // Check if TIFF format is supported
     QStringList supportedFormats;
@@ -33,8 +34,6 @@ int main(int argc, char *argv[])
         return -1;
     }
 
-    QQmlApplicationEngine engine;
-
     QString mapImagePath = getFileUrlRelativeToExecutable("../../data/regions/jena-small/landcover.tif");
     engine.rootContext()->setContextProperty("mapImagePath", mapImagePath);
 

c++/main.qml

@@ -14,7 +14,7 @@ ApplicationWindow {
     // these are the coordinates of the map image
     property var mapCoords: ({ x: 0, y: 0, width: 0, height: 0 })
 
-    // calculate imgCoords of an Image
+    // calculate the visible coordinates of an Image
     function calculateVisibleGeometry(img) {
         var containerWidth = img.width;
         var containerHeight = img.height;