flist.cc revision f220fa62 
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
40#include "glimports.h"
41#include "myassert.h"
42#include "mystdio.h"
43#include "flist.h"
44
45/*----------------------------------------------------------------------------
46 * Flist::Flist - initialize a REAL number array
47 *----------------------------------------------------------------------------
48 */
49Flist::Flist( void )
50{
51    npts = 0;
52    pts = 0;
53    start = end = 0;
54}
55
56/*----------------------------------------------------------------------------
57 * Flist::~Flist - free a REAL number array
58 *----------------------------------------------------------------------------
59 */
60Flist::~Flist( void )
61{
62    if( npts ) delete[] pts;
63}
64
65void
66Flist::add( REAL x )
67{
68    pts[end++] = x;
69    assert( end <= npts );
70}
71
72/*----------------------------------------------------------------------------
73 * Flist::filter - remove duplicate numbers from array
74 *----------------------------------------------------------------------------
75 */
76void Flist::filter( void )
77{
78    sorter.qsort( pts, end );
79    start = 0;
80
81    int j = 0;
82    for( int i = 1; i < end; i++ ) {
83	if( pts[i] == pts[i-j-1] )
84	    j++;
85	pts[i-j] = pts[i];
86    }
87    end -= j;
88}
89
90/*----------------------------------------------------------------------------
91 * Flist::grow - ensure that array is large enough
92 *----------------------------------------------------------------------------
93 */
94void Flist::grow( int maxpts )
95{
96    if( npts < maxpts ) {
97	if( npts ) delete[] pts;
98	npts = 2 * maxpts;
99	pts = new REAL[npts];
100	assert( pts != 0 );
101    }
102    start = end = 0;
103}
104
105/*----------------------------------------------------------------------------
106 * Flist::taper - ignore head and tail of array
107 *----------------------------------------------------------------------------
108 */
109void Flist::taper( REAL from, REAL to )
110{
111    while( pts[start] != from )
112	start++;
113
114    while( pts[end-1] != to )
115	end--;
116}
117
118
119