Add new api to retreive a list of SGBuckets within a bounding rectangle

simgear/bucket/newbucket.cxx

@@ -345,4 +345,13 @@ void sgBucketDiff( const SGBucket& b1, const SGBucket& b2, int *dx, int *dy ) {
 #endif
 }
 
+void sgGetBuckets( const SGGeod& min, const SGGeod& max, std::vector<SGBucket>& list ) {
+    double lon, lat, span;
 
+    for (lat = min.getLatitudeDeg(); lat <= max.getLatitudeDeg(); lat += SG_BUCKET_SPAN) {
+        span = sg_bucket_span( lat );
+        for (lon = min.getLongitudeDeg(); lon <= max.getLongitudeDeg(); lon += span) {
+            list.push_back( SGBucket(lon , lat) );
+        }
+    }
+}

simgear/bucket/newbucket.hxx

@@ -42,6 +42,7 @@
 #include <cstdio> // sprintf()
 #include <ostream>
 #include <string>
+#include <vector>
 
 /**
  * standard size of a bucket in degrees (1/8 of a degree)
@@ -322,6 +323,15 @@ SGBucket sgBucketOffset( double dlon, double dlat, int x, int y );
 void sgBucketDiff( const SGBucket& b1, const SGBucket& b2, int *dx, int *dy );
 
 
+/**
+ * \relates SGBucket
+ * retrieve a list of buckets in the given bounding box
+ * @param min min lon,lat of bounding box in degrees
+ * @param max max lon,lat of bounding box in degrees
+ * @param list standard vector of buckets within the bounding box
+ */
+void sgGetBuckets( const SGGeod& min, const SGGeod& max, std::vector<SGBucket>& list );
+
 /**
  * Write the bucket lon, lat, x, and y to the output stream.
  * @param out output stream