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Annotation of mstools/samples/rpc/mandel/calc.c, revision 1.1

1.1     ! root        1: /****************************************************************************
        !             2: 
        !             3:     CALC.C --
        !             4: 
        !             5:     Code to do the calculations for the Windows Mandelbrot Set distributed
        !             6:     drawing program.
        !             7: 
        !             8:     Copyright (C) 1990 Microsoft Corporation.
        !             9: 
        !            10:     This code sample is provided for demonstration purposes only.
        !            11:     Microsoft makes no warranty, either express or implied,
        !            12:     as to its usability in any given situation.
        !            13: 
        !            14: ****************************************************************************/
        !            15: 
        !            16: #include <windows.h>
        !            17: #include <malloc.h>   // malloc, free
        !            18: #include <stdio.h>
        !            19: 
        !            20: #ifdef RPC
        !            21: #include <rpc.h>
        !            22: #include "mdlrpc.h"
        !            23: #endif
        !            24: 
        !            25: #include "mandel.h"
        !            26: 
        !            27: void  MandelCalc(PCPOINT pcptLL,
        !            28:                 PLONGRECT  prcDraw,
        !            29:                 double  precision,
        !            30:                  DWORD   ulThreshold,
        !            31:                  PLINEBUF pbBuf)
        !            32: {
        !            33:     DWORD   h, height;
        !            34:     DWORD   width;
        !            35:     PWORD   pbPtr;
        !            36:     double  dreal, dimag, dimag2;
        !            37:     short maxit = 0;
        !            38: 
        !            39:     pbPtr = (PWORD) pbBuf;  // PLINEBUF points to the struct LINEBUF;
        !            40:                              // LINEBUF is an array of WORDS
        !            41: 
        !            42:     dreal = pcptLL->real + ((double)prcDraw->xLeft * precision);
        !            43:     dimag = pcptLL->imag + ((double)prcDraw->yBottom * precision);
        !            44: 
        !            45:     maxit = (short) ulThreshold;
        !            46: 
        !            47:     height = (prcDraw->yTop - prcDraw->yBottom) + 1;
        !            48:     width = (prcDraw->xRight - prcDraw->xLeft) + 1;
        !            49: 
        !            50:     for ( ; width > 0; --width, dreal += precision) {
        !            51:         for (dimag2 = dimag, h = height; h > 0; --h, dimag2 += precision)
        !            52:         {
        !            53:               if ((dreal > 4.0) || (dreal < -4.0) ||
        !            54:                   (dimag2 > 4.0) || (dimag2 < -4.0))
        !            55:                 *(pbPtr++) = 0L;
        !            56:               else
        !            57:                *(pbPtr++) = (WORD) (calcmand(dreal, dimag2, maxit));
        !            58:        }
        !            59:     }
        !            60:     return;
        !            61: }
        !            62: 
        !            63: 
        !            64: // midl requires these functions
        !            65: // ====================================================================
        !            66: //                MIDL allocate and free
        !            67: // ====================================================================
        !            68: 
        !            69: 
        !            70: void * MIDL_user_allocate(unsigned long len)
        !            71: {
        !            72:     return(PDWORD) (LocalLock(LocalAlloc(LMEM_MOVEABLE, len)));
        !            73: }
        !            74: 
        !            75: void MIDL_user_free(void * ptr)
        !            76: {
        !            77:       LocalFree(ptr);
        !            78: }
        !            79: 
        !            80: /* C version of the assembly language program */
        !            81: 
        !            82: short calcmand(double dreal, double dimag, short maxit)
        !            83: {
        !            84: double x, y, xsq, ysq;
        !            85: short k;
        !            86: 
        !            87:     k = (short) maxit;
        !            88:     x = dreal;
        !            89:     y = dimag;
        !            90: 
        !            91:     while (1) {
        !            92:         xsq = x * x;
        !            93:         ysq = y * y;
        !            94:         y = 2.0 * x * y + dimag;
        !            95:         x = (xsq - ysq) + dreal;
        !            96:         if (--k == 0)
        !            97:             return((short) (maxit - k));
        !            98:         if ((xsq + ysq) > 4.0)
        !            99:             return((short) (maxit - k));
        !           100:     }
        !           101: }

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