FreeWRL / FreeX3D 4.3.0
flist.cc
1/*
2** License Applicability. Except to the extent portions of this file are
3** made subject to an alternative license as permitted in the SGI Free
4** Software License B, Version 1.1 (the "License"), the contents of this
5** file are subject only to the provisions of the License. You may not use
6** this file except in compliance with the License. You may obtain a copy
7** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
8** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
9**
10** http://oss.sgi.com/projects/FreeB
11**
12** Note that, as provided in the License, the Software is distributed on an
13** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
14** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
15** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
16** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
17**
18** Original Code. The Original Code is: OpenGL Sample Implementation,
19** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
20** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
21** Copyright in any portions created by third parties is as indicated
22** elsewhere herein. All Rights Reserved.
23**
24** Additional Notice Provisions: The application programming interfaces
25** established by SGI in conjunction with the Original Code are The
26** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
27** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
28** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
29** Window System(R) (Version 1.3), released October 19, 1998. This software
30** was created using the OpenGL(R) version 1.2.1 Sample Implementation
31** published by SGI, but has not been independently verified as being
32** compliant with the OpenGL(R) version 1.2.1 Specification.
33*/
34
35/*
36 * flist.c++
37 *
38 */
39#ifdef __unix__
40# include <assert.h>
41#endif
42
43
44#include "glimports.h"
45#include "myassert.h"
46#include "mystdio.h"
47#include "flist.h"
48
49/*----------------------------------------------------------------------------
50 * Flist::Flist - initialize a REAL number array
51 *----------------------------------------------------------------------------
52 */
53Flist::Flist( void )
54{
55 npts = 0;
56 pts = 0;
57 start = end = 0;
58}
59
60/*----------------------------------------------------------------------------
61 * Flist::~Flist - free a REAL number array
62 *----------------------------------------------------------------------------
63 */
64Flist::~Flist( void )
65{
66 if( npts ) delete[] pts;
67}
68
69void
70Flist::add( REAL x )
71{
72 pts[end++] = x;
73 assert( end <= npts );
74}
75
76/*----------------------------------------------------------------------------
77 * Flist::filter - remove duplicate numbers from array
78 *----------------------------------------------------------------------------
79 */
80void Flist::filter( void )
81{
82 sorter.qsort( pts, end );
83 start = 0;
84
85 int j = 0;
86 for( int i = 1; i < end; i++ ) {
87 if( pts[i] == pts[i-j-1] )
88 j++;
89 pts[i-j] = pts[i];
90 }
91 end -= j;
92}
93
94/*----------------------------------------------------------------------------
95 * Flist::grow - ensure that array is large enough
96 *----------------------------------------------------------------------------
97 */
98void Flist::grow( int maxpts )
99{
100 if( npts < maxpts ) {
101 if( npts ) delete[] pts;
102 npts = 2 * maxpts;
103 pts = new REAL[npts];
104 assert( pts != 0 );
105 }
106 start = end = 0;
107}
108
109/*----------------------------------------------------------------------------
110 * Flist::taper - ignore head and tail of array
111 *----------------------------------------------------------------------------
112 */
113void Flist::taper( REAL from, REAL to )
114{
115 while( pts[start] != from )
116 start++;
117
118 while( pts[end-1] != to )
119 end--;
120}
121
122