sampledLine.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*/
37
38#include <stdlib.h>
39#include <stdio.h>
40#include <math.h> //for fabs()
41#include "glimports.h"
42#include "zlassert.h"
43#include "sampledLine.h"
44
45void sampledLine::setPoint(Int i, Real p[2])
46{
47  points[i][0]=p[0];
48  points[i][1]=p[1];
49}
50
51
52/*insert this single line in front of the oldList*/
53sampledLine* sampledLine::insert(sampledLine *oldList)
54{
55  next = oldList;
56  return this;
57}
58
59void sampledLine::deleteList()
60{
61  sampledLine *temp, *tempNext;
62  for(temp = this; temp != NULL; temp = tempNext)
63    {
64      tempNext = temp->next;
65      delete temp;
66    }
67}
68
69
70/*space of points[][2] is allocated*/
71sampledLine::sampledLine(Int n_points)
72{
73  npoints = n_points;
74  points = (Real2*) malloc(sizeof(Real2) * n_points);
75  assert(points);
76  next = NULL;
77}
78
79/*space of points[][2] is allocated and
80 *points are copied
81 */
82sampledLine::sampledLine(Int n_points, Real2 pts[])
83{
84  int i;
85  npoints = n_points;
86  points = (Real2*) malloc(sizeof(Real2) * n_points);
87  assert(points);
88  for(i=0; i<npoints; i++) {
89    points[i][0] = pts[i][0];
90    points[i][1] = pts[i][1];
91  }
92  next = NULL;
93}
94
95sampledLine::sampledLine(Real pt1[2], Real pt2[2])
96{
97  npoints = 2;
98  points = (Real2*) malloc(sizeof(Real2) * 2);
99  assert(points);
100  points[0][0] = pt1[0];
101  points[0][1] = pt1[1];
102  points[1][0] = pt2[0];
103  points[1][1] = pt2[1];
104  next = NULL;
105}
106
107//needs tp call init to setup
108sampledLine::sampledLine()
109{
110  npoints = 0;
111  points = NULL;
112  next = NULL;
113}
114
115//warning: ONLY pointer is copies!!!
116void sampledLine::init(Int n_points, Real2 *pts)
117{
118  npoints = n_points;
119  points = pts;
120}
121
122/*points[] is dealocated
123 */
124sampledLine::~sampledLine()
125{
126  free(points);
127}
128
129void sampledLine::print()
130{
131  int i;
132  printf("npoints=%i\n", npoints);
133
134  for(i=0; i<npoints; i++){
135    printf("(%f,%f)\n", points[i][0], points[i][1]);
136  }
137
138}
139
140void sampledLine::tessellate(Real u_reso, Real v_reso)
141{
142  int i;
143
144  Int nu, nv, n;
145  nu = 1+(Int) (fabs((points[npoints-1][0] - points[0][0])) * u_reso);
146  nv = 1+(Int) (fabs((points[npoints-1][1] - points[0][1])) * v_reso);
147
148  if(nu > nv) n = nu;
149  else
150    n = nv;
151  if(n<1)
152    n = 1;
153  //du dv could be negative
154  Real du = (points[npoints-1][0] - points[0][0])/n;
155  Real dv = (points[npoints-1][1] - points[0][1])/n;
156  Real2 *temp = (Real2*) malloc(sizeof(Real2) * (n+1));
157  assert(temp);
158
159  Real u,v;
160  for(i=0, u=points[0][0], v=points[0][1]; i<n; i++, u+=du, v+=dv)
161    {
162      temp[i][0] = u;
163      temp[i][1] = v;
164    }
165  temp[n][0] = points[npoints-1][0];
166  temp[n][1] = points[npoints-1][1];
167
168  free(points);
169
170  npoints = n+1;
171  points = temp;
172
173}
174
175void sampledLine::tessellateAll(Real u_reso, Real v_reso)
176{
177  sampledLine* temp;
178  for(temp = this; temp != NULL; temp = temp->next)
179    {
180      temp->tessellate(u_reso, v_reso);
181    }
182}
183