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Annotation of researchv10no/cmd/dimpress/rotate.h, revision 1.1

1.1     ! root        1: 
        !             2: /*
        !             3:  *
        !             4:  * A few definitions and macros used by routines that rotate glyphs.
        !             5:  *
        !             6:  * Although the Imprint-10 System Manual seems to imply that downloaded
        !             7:  * glyphs can be rotated if desired, version 1.8 only appears to use the
        !             8:  * rotation bits to locate glyphs that the user claims can be used in a
        !             9:  * rotated coordinate system. In otherwords it appears that we're either
        !            10:  * going to have to use raster tables that have already been rotated or
        !            11:  * do all the required rotations and coordinate mappings at run time.
        !            12:  *
        !            13:  */
        !            14: 
        !            15: 
        !            16: #include "impcodes.h"                  /* just needed for ROT_COUNT */
        !            17: 
        !            18: 
        !            19: /*
        !            20:  *
        !            21:  * The obvious functions, for the defined rotation angles, used in the
        !            22:  * in the coordinate transformation macros given below. Arrays are defined
        !            23:  * in rotate.c.
        !            24:  *
        !            25:  */
        !            26: 
        !            27: 
        !            28: #define COSINE(A)      cosine[A]
        !            29: #define SINE(A)                sine[A]
        !            30: #define DELTA(A)       delta[A]
        !            31: 
        !            32: 
        !            33: /*
        !            34:  *
        !            35:  * A few macros used to do the rotation and translation of the bitmaps and
        !            36:  * the other important glyph parameters.
        !            37:  *
        !            38:  */
        !            39: 
        !            40: 
        !            41: #define ROTX(X, Y, A)                  /* x in rotated coordinate system */    \
        !            42:                                                                                \
        !            43:        (X) * COSINE((A) % ROT_COUNT) - (Y) * SINE((A) % ROT_COUNT)
        !            44: 
        !            45: 
        !            46: #define ROTY(X, Y, A)                  /* y in rotated coordinate system */    \
        !            47:                                                                                \
        !            48:        (X) * SINE((A) % ROT_COUNT) + (Y) * COSINE((A) % ROT_COUNT)
        !            49: 
        !            50: 
        !            51: #define TRANSX(H, W, A)                        /* new x after bitmap translation */    \
        !            52:                                                                                \
        !            53:        (H-1) * DELTA(((A)-ROT_90)%ROT_COUNT) + (W-1) * DELTA(((A)-ROT_180)%ROT_COUNT)
        !            54: 
        !            55: 
        !            56: #define TRANSY(H, W, A)                        /* y after bitmap translation */                \
        !            57:                                                                                \
        !            58:        (H-1) * DELTA(((A)-ROT_180)%ROT_COUNT) + (W-1) * DELTA(((A)-ROT_270)%ROT_COUNT)
        !            59: 
        !            60: 
        !            61: #define NEWX(X, Y, H, W, A)            /* x after rotation and translation */  \
        !            62:                                                                                \
        !            63:        ROTX(X, Y, A) + TRANSX(H, W, A)
        !            64: 
        !            65: 
        !            66: #define NEWY(X, Y, H, W, A)            /* y after rotation and translation */  \
        !            67:                                                                                \
        !            68:        ROTY(X, Y, A) + TRANSY(H, W, A)
        !            69: 
        !            70: 
        !            71: 
        !            72: /*
        !            73:  *
        !            74:  * sine, cosine, and delta are integer arrays declared in rotate.c. Anyone
        !            75:  * trying to use to coordinate transformation macros will need to know about
        !            76:  * them and include rotate.c in their program.
        !            77:  *
        !            78:  */
        !            79: 
        !            80: 
        !            81: extern int     cosine[];
        !            82: extern int     sine[];
        !            83: extern int     delta[];
        !            84: 

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