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rotate.h

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#ifndef __ROTATE_H

#define __ROTATE_H

#define DIAGONAL_SCALING 0.707

#define   DIR_UP              0
#define   DIR_UPRIGHT         1
#define   DIR_RIGHT           2
#define   DIR_DOWNRIGHT       3
#define   DIR_DOWN            4
#define   DIR_DOWNLEFT        5
#define   DIR_LEFT            6
#define   DIR_UPLEFT          7
#define   DIR_SIZE            8

#define   RELDIR_FORWARD      8
#define   RELDIR_BACKWARD     9
#define   RELDIR_LEFT        10
#define   RELDIR_RIGHT       11
#define   RELDIR_FR          12
#define   RELDIR_BR          13
#define   RELDIR_BL          14
#define   RELDIR_FL          15
#define   RELDIR_RANDOM4     16 // not implemented
#define   RELDIR_RANDOM360   17 // not implemented
// missing: DIR_RAND4CARD - cardinals (up,down,left,right)
//          DIR_RAND4DIAG - diagonals
//          DIR_RAND8     - cardinals and diagonals
//          DIR_RAND360   - any direction (same as reldir_random360...)

void rotate_setup();
void xy_scaling( int dir, float* x, float* y );
void xy_components( int dir, float speed, float* x, float* y );
int  dir_opposite( int dir );
int  dir_cwise( int dir );
int  dir_ccwise( int dir );
int  dir_after_rotations( int dir, int rot );
int  dir_covered( int dir, int otherdir ); 
int  xy_to_dir( float x, float y ); 
// dir_covered
//
// There are times when one direction "covers" another direction.
// For example, a gun is given a direction which "covers"
// the facing of the gun holder. If the gun has direction DIR_UP,
// but the object has facing DIR_LEFT, DIR_UP successfully covers it.
// Suppose the gun had RELDIR_FR, and covered DIR_LEFT; Then the
// result is DIR_UPLEFT.

#endif // __ROTATE_H

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