X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=simgear%2Fbucket%2Fnewbucket.hxx;h=09169f860fd0435d8d8a60a5a185ac7842e4edfb;hb=f205e918d9e1df28da3df69c6c58df6b6391916f;hp=d3e8783af3372c34830ed901c6ce17129a739fe8;hpb=872db67f21e9f89bc4282e571d448a704f01d8e5;p=simgear.git

diff --git a/simgear/bucket/newbucket.hxx b/simgear/bucket/newbucket.hxx
index d3e8783a..09169f86 100644
--- a/simgear/bucket/newbucket.hxx
+++ b/simgear/bucket/newbucket.hxx
@@ -24,6 +24,11 @@
 
 /** \file newbucket.hxx
  * A class and associated utiltity functions to manage world scenery tiling.
+ *
+ * Tile borders are aligned along circles of latitude and longitude.
+ * All tiles are 1/8 degree of latitude high and their width in degrees
+ * longitude depends on their latitude, adjusted in such a way that
+ * all tiles cover about the same amount of area of the earth surface.
  */
 
 #ifndef _NEWBUCKET_HXX
@@ -37,6 +42,7 @@
 #include <cstdio> // sprintf()
 #include <ostream>
 #include <string>
+#include <vector>
 
 /**
  * standard size of a bucket in degrees (1/8 of a degree)
@@ -52,9 +58,7 @@
 // return the horizontal tile span factor based on latitude
 static double sg_bucket_span( double l ) {
     if ( l >= 89.0 ) {
-	return 360.0;
-    } else if ( l >= 88.0 ) {
-	return 8.0;
+	return 12.0;
     } else if ( l >= 86.0 ) {
 	return 4.0;
     } else if ( l >= 83.0 ) {
@@ -75,12 +79,10 @@ static double sg_bucket_span( double l ) {
 	return 1.0;
     } else if ( l >= -86.0 ) {
 	return 2.0;
-    } else if ( l >= -88.0 ) {
-	return 4.0;
     } else if ( l >= -89.0 ) {
-	return 8.0;
+	return 4.0;
     } else {
-	return 360.0;
+	return 12.0;
     }
 }
 
@@ -211,9 +213,9 @@ public:
 	double span = sg_bucket_span( lat + y / 8.0 + SG_HALF_BUCKET_SPAN );
 
 	if ( span >= 1.0 ) {
-	    return lon + span / 2.0;
+	    return lon + get_width() / 2.0;
 	} else {
-	    return lon + x * span + span / 2.0;
+	    return lon + x * span + get_width() / 2.0;
 	}
     }
 
@@ -321,6 +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
@@ -329,7 +340,7 @@ void sgBucketDiff( const SGBucket& b1, const SGBucket& b2, int *dx, int *dy );
 inline std::ostream&
 operator<< ( std::ostream& out, const SGBucket& b )
 {
-    return out << b.lon << ":" << b.x << ", " << b.lat << ":" << b.y;
+    return out << b.lon << ":" << (int)b.x << ", " << b.lat << ":" << (int)b.y;
 }