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      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 
     45 void 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*/
     53 sampledLine* sampledLine::insert(sampledLine *oldList)
     54 {
     55   next = oldList;
     56   return this;
     57 }
     58 
     59 void 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*/
     71 sampledLine::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  */
     82 sampledLine::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 
     95 sampledLine::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
    108 sampledLine::sampledLine()
    109 {
    110   npoints = 0;
    111   points = NULL;
    112   next = NULL;
    113 }
    114 
    115 //warning: ONLY pointer is copies!!!
    116 void sampledLine::init(Int n_points, Real2 *pts)
    117 {
    118   npoints = n_points;
    119   points = pts;
    120 }
    121 
    122 /*points[] is dealocated
    123  */
    124 sampledLine::~sampledLine()
    125 {
    126   free(points);
    127 }
    128 
    129 void 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 
    140 void 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 
    175 void 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