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The structure Point_curve

This is the C definition of the structure:

typedef struct point_curve {
  int x,y; /* Coordinates of the point */

  /* For use in Curve only */
  struct point_curve *previous; /*Pointer to the previous point (may be NULL)*/
  struct point_curve *next; /* Pointer to the next point (may be NULL) */
} *Point_curve;

The first two fields x and y are the coordinates (x, y) of the point in the plane. Since the Curve and the Polygon structures are defined as a chain of Point_curve, there are two pointers previous and next associated to each point.



mw 2004-05-05