/** \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
#include <simgear/constants.h>
#include <simgear/math/SGMath.hxx>
-#ifdef SG_HAVE_STD_INCLUDES
-# include <cmath>
-# include <cstdio> // sprintf()
-#else
-# include <math.h>
-# include <stdio.h> // sprintf()
-#endif
-
-#include STL_IOSTREAM
-
-// I don't understand ... <math.h> or <cmath> should be included
-// already depending on how you defined SG_HAVE_STD_INCLUDES, but I
-// can go ahead and add this -- CLO
-#ifdef __MWERKS__
-SG_USING_STD(sprintf);
-SG_USING_STD(fabs);
-#endif
-
-#include STL_STRING
-
-SG_USING_STD(string);
-SG_USING_STD(ostream);
-
+#include <cmath>
+#include <cstdio> // sprintf()
+#include <ostream>
+#include <string>
+#include <vector>
/**
* standard size of a bucket in degrees (1/8 of a degree)
// 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 ) {
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;
}
}
class SGBucket {
private:
- double cx, cy; // centerpoint (lon, lat) in degrees of bucket
short lon; // longitude index (-180 to 179)
short lat; // latitude index (-90 to 89)
char x; // x subdivision (0 to 7)
*/
SGBucket(const long int bindex);
- /** Explicit Destructor
- */
- ~SGBucket();
-
/**
* Reset a bucket to represent a new lat and lon
* @param dlon longitude specified in degrees
* string form.
* @return tile index in string form
*/
- inline string gen_index_str() const {
+ inline std::string gen_index_str() const {
char tmp[20];
- sprintf(tmp, "%ld",
- (((long)lon + 180) << 14) + ((lat + 90) << 6) + (y << 3) + x);
- return (string)tmp;
+ std::sprintf(tmp, "%ld",
+ (((long)lon + 180) << 14) + ((lat + 90) << 6)
+ + (y << 3) + x);
+ return (std::string)tmp;
}
/**
* Build the base path name for this bucket.
* @return base path in string form
*/
- string gen_base_path() const;
+ std::string gen_base_path() const;
/**
* @return the center lon of a tile.
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;
}
}
// friends
- friend ostream& operator<< ( ostream&, const SGBucket& );
+ friend std::ostream& operator<< ( std::ostream&, const SGBucket& );
friend bool operator== ( const SGBucket&, const SGBucket& );
};
+inline bool operator!= (const SGBucket& lhs, const SGBucket& rhs)
+ {
+ return !(lhs == rhs);
+ }
+
/**
* \relates SGBucket
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
* @param b bucket
*/
-inline ostream&
-operator<< ( ostream& out, const SGBucket& b )
+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;
}