Changeset 16935 for trunk/Ohana/src/opihi/include/astro.h

Timestamp:

Mar 11, 2008, 11:11:54 AM (18 years ago)

Author:

eugene

Message:

better api for coordinate transforms

File:

• trunk/Ohana/src/opihi/include/astro.h (modified) (1 diff)

trunk/Ohana/src/opihi/include/astro.h

@@ -11 +11 @@
 void InitAstro ();
 
+typedef struct {
+  int    isIdentity;          // identity transformation 
+  double phi;                 // saved in radians
+  double Xo;                  // saved in radians
+  double xo;                  // saved in degrees
+  double sin_phi_cos_Xo;      // pre-computed values
+  double sin_phi_sin_Xo;      // pre-computed values
+  double cos_phi_cos_Xo;      // pre-computed values
+  double cos_phi_sin_Xo;      // pre-computed values
+  double cos_phi;             // pre-computed values
+  double sin_phi;             // pre-computed values
+  double cos_Xo;              // pre-computed values
+  double sin_Xo;              // pre-computed values
+} CoordTransform;
+
+typedef enum {COORD_NONE, COORD_CELESTIAL, COORD_GALACTIC, COORD_ECLIPTIC} CoordTransformSystem;
+
+CoordTransform *InitTransform (CoordTransformSystem input, CoordTransformSystem output);
+int ApplyTransform (double *x, double *y, double X, double Y, CoordTransform *transform);
+
 # endif