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Annotation of 43BSDReno/lib/libplot/aed/subr.c, revision 1.1

1.1     ! root        1: #ifndef lint
        !             2: static char sccsid[] = "@(#)subr.c     4.1 (Berkeley) 11/11/83";
        !             3: #endif
        !             4: 
        !             5: #include "aed.h"
        !             6: 
        !             7: /*
        !             8:  * The following table is used to convert numbers to hex.  We cannot use
        !             9:  * standard C library conversion because it generates lower case letters
        !            10:  * which are bad news to the AED512.
        !            11:  */
        !            12: 
        !            13: static char hex[] = "0123456789ABCDEF";
        !            14: 
        !            15: /*---------------------------------------------------------
        !            16:  *     This is a local routine that converts an integer to a string
        !            17:  *     of hexadecimal characters.
        !            18:  *
        !            19:  *     Results:        None.
        !            20:  *
        !            21:  *     Side Effects:
        !            22:  *     The string contains the value of the low-order nchars 4-bit chunks
        !            23:  *     of val, as represented in hexadecimal.  String is zero-filled.
        !            24:  *---------------------------------------------------------
        !            25:  */
        !            26: chex(val, string, nchars)
        !            27: int val;                       /* Integer value to be converted. */
        !            28: char *string;                  /* Pointer to area for converted result. */
        !            29: int nchars;                    /* Number of characters to be converted. */
        !            30: {
        !            31:     string = &(string[nchars]);
        !            32:     *string = '\0';
        !            33:     for (; nchars>0 ; nchars--)
        !            34:     {
        !            35:        *(--string) = hex[val & 017];
        !            36:        val >>= 4;
        !            37:     }
        !            38: }
        !            39: 
        !            40: /*---------------------------------------------------------
        !            41:  *     This local routine outputs an x-y coordinate pair in the standard
        !            42:  *     format required by the AED display.
        !            43:  *
        !            44:  *     Results:        None.
        !            45:  *     
        !            46:  *     Side Effects:
        !            47:  *     Characters are output to the AED512 in the standard way required
        !            48:  *     for values indicated by "xy20" in the user manual.
        !            49:  *
        !            50:  *     Errors:         None.
        !            51:  *---------------------------------------------------------
        !            52:  */
        !            53: outxy20(x, y)
        !            54: int x, y;                      /* The coordinates to be output.  Note:
        !            55:                                 * these are world coordinates, not screen
        !            56:                                 * ones.  We scale in this routine.
        !            57:                                 */
        !            58: {
        !            59:     char s1[4], s2[4], s3[4];
        !            60:     x = ((x - xbot) * scale)>>12;
        !            61:     y = ((y - ybot) * scale)>>12;
        !            62:     chex(((y>>8)&03) | ((x>>6)&014), s1, 1);
        !            63:     chex(x&0377, s2, 2);
        !            64:     chex(y&0377, s3, 2);
        !            65:     fprintf(stdout, "%s%s%s", s1, s2, s3);
        !            66: }
        !            67: 
        !            68: /*---------------------------------------------------------
        !            69:  *     This routine sets the display's current color.
        !            70:  *
        !            71:  *     Results:        None.
        !            72:  *
        !            73:  *     Side Effects:
        !            74:  *     The current color in the display is set to pcolor, if it
        !            75:  *     isn't that already.
        !            76:  *---------------------------------------------------------
        !            77:  */
        !            78: setcolor(pcolor)
        !            79: char *pcolor;                  /* Pointer to a string giving the desired
        !            80:                                 * color in hexadecimal.
        !            81:                                 */
        !            82: {
        !            83:     static char curcolor[] = "xx";
        !            84:     if ((pcolor[0] != curcolor[0]) || (pcolor[1] != curcolor[1]))
        !            85:     {
        !            86:        curcolor[0] = pcolor[0];
        !            87:        curcolor[1] = pcolor[1];
        !            88:        putc('L', stdout);
        !            89:        fputs(curcolor, stdout);
        !            90:     }
        !            91: }

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