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/* Copyright (c) 1992 The Geometry Center; University of Minnesota
1300 South Second Street; Minneapolis, MN 55454, USA;
This file is part of geomview/OOGL. geomview/OOGL is free software;
you can redistribute it and/or modify it only under the terms given in
the file COPYING, which you should have received along with this file.
This and other related software may be obtained via anonymous ftp from
geom.umn.edu; email: software@geom.umn.edu. */
/* Authors: Charlie Gunn, Stuart Levy, Tamara Munzner, Mark Phillips */
#ifndef VECTPDEF
#define VECTPDEF
#include "geomclass.h"
#include "vect.h"
/*
* A Vect is a collection of polylines.
* It's represented by:
* p, an array of vertices (for all the polylines in sequence),
* c, an array of r/g/b/alpha colors (not necessarily one per vertex),
* vnvert, an array of sizes (vertex counts) of each polyline,
* vncolor, an array of numbers of colors (c[] entry counts) of each polyline,
* nvec, giving the number of polylines (entries in vnvert and vncolor),
* nvert, giving the total number of vertices (entries in p),
* ncolor, the total number of colors (entries in c).
*
* Here's the association:
* Let vN = sum from i = 0 to N-1 of vnvert[i],
* and cN = sum from i = 0 to N-1 of vncolor[i],
* then polyline N comprises the vnvert[N] vertices
* from p[vN] through p[vN + vnvert[N] - 1]
* and is drawn using the vncolor[N] different colors
* from c[cN] through c[cN + vncolor[N] - 1].
*
* This encoding implies colors and vertices may not be reused from line to
* line (but the previous color persists for lines with 0 colors, see below).
*
* Closed polylines:
* A polyline is drawn closed (the last element connected to the first)
* if its vnvert[N] is negative. It's then considered to have
* abs(vnvert[N]) vertices in the p[] array.
*
* A polyline with 1 vertex is a point. 0 vertices are illegal.
*
* Coloring:
* It's intended that polylines will be specified with either
* 0, 1, or abs(vnvert[N]) colors. The effects in each case are:
* 0: the polyline is drawn with the same color as the previous polyline.
* 1: the polyline is drawn with the specified single color.
* abs(vnvert[N]): each vertex is colored with the specified color.
* intermediate points on the line are interpolated.
*/
struct Vect {
GEOMFIELDS
int flag, nvec, nvert, ncolor;
int seq; /* for 4D -> 3D tforms */
short *vnvert; /* vnvert[nvec] (# p[]'s per vec) */
short *vncolor; /* vncolor[nvec] (# c[]'s per vec) */
/* NOTE: vnvert and vncolor lie in a *single* malloc'ed area */
/* To free, OOGLFree(vnvert). */
HPoint3 *p; /* p[nvert] */
ColorA *c; /* c[ncolor] */
};
#define VECT_4D 1
extern Vect *VectCreate( Vect *, GeomClass *, va_list );
extern void VectDelete( Vect * );
extern Vect *VectCopy( Vect * );
extern Vect *VectPick( Vect *, Pick *, Appearance *, Transform );
#endif /*VECTPDEF*/
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