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/* Copyright (c) 1986 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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/* |
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* clip.c - routine to clip 3D line segments to a box. |
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* |
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* 8/28/85 |
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*/ |
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#include "copyright.h" |
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#include "fvect.h" |
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#include "plocate.h" |
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#define MAXITER 6 /* maximum possible number of iterations */ |
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int |
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clip(ep1, ep2, min, max) /* clip a line segment to a box */ |
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double *ep1, *ep2; |
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double min[3], max[3]; |
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FLOAT *ep1, *ep2; |
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FVECT min, max; |
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{ |
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int itlim = MAXITER; |
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int loc1, loc2; |
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int accept; |
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double *dp; |
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FLOAT *dp; |
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double d; |
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register int i, j; |
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while (!((accept = !(loc1 | loc2)) || (loc1 & loc2))) { |
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if (itlim-- <= 0) /* past theoretical limit? */ |
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return(0); /* quit fooling around */ |
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if (!loc1) { /* make sure first point is outside */ |
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dp = ep1; ep1 = ep2; ep2 = dp; |
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i = loc1; loc1 = loc2; loc2 = i; |
