Feature: Add 2D WKT representation for bbox

CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/datastructure/BoundingBox.java

@@ -161,4 +161,29 @@ public class BoundingBox {
     public double getDiagonalLength() {
         return bbox[1].getDistance(bbox[0]);
     }
+
+    /**
+     * Returns a WKT polygon representation in 2D (the "shadow") of this bbox
+     *
+     * @return WKT String of this bbox's shadow
+     */
+    public String toWktShadow() {
+        double x1 = bbox[0].getX();
+        double y1 = bbox[0].getY();
+        double x2 = x1 + bbox[1].getX();
+        double y2 = y1 + bbox[1].getY();
+
+        double minX = Math.min(x1, x2);
+        double minY = Math.min(y1, y2);
+        double maxX = Math.max(x1, x2);
+        double maxY = Math.max(y1, y2);
+
+        return String.format("POLYGON((%.3f %.3f, %.3f %.3f, %.3f %.3f, %.3f %.3f, %.3f %.3f))",
+                minX, minY,
+                maxX, minY,
+                maxX, maxY,
+                minX, maxY,
+                minX, minY
+        );
+    }
 }