src/pre-grn/hpoint.cpp

   1 /*
   2  * This file contains routines for manipulating the point data structures
   3  * for the gremlin picture editor.
   4  */
   5 /* Last non-groff version: hpoint.c  1.1  84/10/08 */
   6
   7 #include "config.h"
   8 #include "grn-config.h"
   9
  10 #include <stdlib.h>
  11
  12 #include "gprint.h"
  13
  14 /*
  15  * Return pointer to empty point list.
  16  */
  17 POINT *
  18 PTInit()
  19 {
  20   return ((POINT *) NULL);
  21 }
  22
  23 /*
  24  * This routine creates a new point with coordinates x and y and links it
  25  * into the pointlist.
  26  */
  27 POINT *
  28 PTMakePoint(double x,
  29             double y,
  30             POINT **pplist)
  31 {
  32   register POINT *pt;
  33
  34   if (Nullpoint(pt = *pplist)) {        /* empty list */
  35     *pplist = (POINT *) malloc(sizeof(POINT));
  36     pt = *pplist;
  37   } else {
  38     while (!Nullpoint(pt->nextpt))
  39       pt = pt->nextpt;
  40     pt->nextpt = (POINT *) malloc(sizeof(POINT));
  41     pt = pt->nextpt;
  42   }
  43
  44   pt->x = x;
  45   pt->y = y;
  46   pt->nextpt = PTInit();
  47   return (pt);
  48 }                               /* end PTMakePoint */
  49
  50 // s-it2-mode