FGFS-4.1/simgear
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Added methods to return tile dimension in meters.

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This commit is contained in:
curt
2000-12-04 04:11:03 +00:00
parent 4b1d777ad4
commit 1da02cca4c
2 changed files with 36 additions and 5 deletions
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27
simgear/bucket/newbucket.cxx
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@@ -85,6 +85,33 @@ string FGBucket::gen_base_path() const {
}
// return width of the tile in meters
double FGBucket::get_width_m() const {
double clat = (int)get_center_lat();
if ( clat > 0 ) {
clat = (int)clat + 0.5;
} else {
clat = (int)clat - 0.5;
}
double clat_rad = clat * DEG_TO_RAD;
double cos_lat = cos( clat_rad );
double local_radius = cos_lat * EQUATORIAL_RADIUS_M;
double local_perimeter = 2.0 * local_radius * FG_PI;
double degree_width = local_perimeter / 360.0;
return bucket_span( get_center_lat() ) * degree_width;
}
// return height of the tile in meters
double FGBucket::get_height_m() const {
double perimeter = 2.0 * EQUATORIAL_RADIUS_M * FG_PI;
double degree_height = perimeter / 360.0;
return FG_BUCKET_SPAN * degree_height;
}
// find the bucket which is offset by the specified tile units in the
// X & Y direction. We need the current lon and lat to resolve
// ambiguities when going from a wider tile to a narrower one above or

14
simgear/bucket/newbucket.hxx
View File

@@ -107,14 +107,18 @@ public:
// return the center lon of a tile
double get_center_lon() const;
// return width of the tile
// return width of the tile in degrees
double get_width() const;
// return width of the tile in meters
double get_width_m() const;
// return height of the tile in degrees
double get_height() const;
// return height of the tile in meters
double get_height_m() const;
// return the center lat of a tile
double get_center_lat() const;
// return height of the tile
double get_height() const;
// Informational methods
inline int get_lon() const { return lon; }
@@ -300,13 +304,13 @@ inline double FGBucket::get_center_lat() const {
}
// return width of the tile
// return width of the tile in degrees
inline double FGBucket::get_width() const {
return bucket_span( get_center_lat() );
}
// return height of the tile
// return height of the tile in degrees
inline double FGBucket::get_height() const {
return FG_BUCKET_SPAN;
}