nextstep.c 6.61 KB
Newer Older
Cassio Kirch's avatar
Cassio Kirch committed
1
#include <stdio.h>
Cassio Kirch's avatar
Cassio Kirch committed
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33
#include <stdlib.h>
#include <stdbool.h>
#include <math.h>
#include <err.h>

#include "define.h"
#include "boid.h"
#include "box.h"
#include "distance.h"
#include "nextstep.h"

void
checkLimits (struct Boid* const boid)
{
  while (boid -> position[X] < -(RANGE / 2.0))
    boid -> position[X] += RANGE;
  while (boid -> position[X] > (RANGE / 2.0))
    boid -> position[X] -= RANGE;
  while (boid -> position[Y] < -(RANGE / 2.0))
    boid -> position[Y] += RANGE;
  while (boid -> position[Y] > (RANGE / 2.0))
    boid -> position[Y] -= RANGE;
}

void
makeSum (struct Boid* const boid, const struct Boid* conductor, \
         double* const sumFX, double* const sumFY,              \
         double* const sumVX, double* const sumVY)
{
  struct Distance distance;
  double force;
  while (conductor != NULL)
Cassio Kirch's avatar
Cassio Kirch committed
34 35
  {
    if (boid != conductor)
Cassio Kirch's avatar
Cassio Kirch committed
36
    {
Cassio Kirch's avatar
Cassio Kirch committed
37 38 39 40 41 42 43 44
      distance = getDistance (boid, conductor);
      if (distance.module <= NEIGHBOR_DISTANCE)
      {
        //boid -> neighbors++;
        force = getForce (distance.module);
        
        if (conductor -> type == ENDODERM &&    \
            boid -> type == ENDODERM)
Cassio Kirch's avatar
Cassio Kirch committed
45
        {
Cassio Kirch's avatar
Cassio Kirch committed
46 47 48 49
          *sumFX += BETA11 * force * distance.cosine;
          *sumFY += BETA11 * force * distance.sine;
          *sumVX += ALPHA11 * conductor -> velocity[X] / V0;
          *sumVY += ALPHA11 * conductor -> velocity[Y] / V0;
Cassio Kirch's avatar
Cassio Kirch committed
50
        }
Cassio Kirch's avatar
Cassio Kirch committed
51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69
        
        else if (conductor -> type == ECTODERM &&       \
                 boid -> type == ECTODERM)
        {
          *sumFX += BETA22 * force * distance.cosine;
          *sumFY += BETA22 * force * distance.sine;
          *sumVX += ALPHA22 * conductor -> velocity[X] / V0;
          *sumVY += ALPHA22 * conductor -> velocity[Y] / V0;
        }
        
        else
        {
          *sumFX += BETA12 * force * distance.cosine;
          *sumFY += BETA12 * force * distance.sine;
          *sumVX += ALPHA12 * conductor -> velocity[X] / V0;
          *sumVY += ALPHA12 * conductor -> velocity[Y] / V0;
          //if (conductor -> type == ECTODERM) /* And boid->type==ENDO */
          //boid -> ectoNeighbors++;
        }
Cassio Kirch's avatar
Cassio Kirch committed
70 71

#if defined(ENDO_GAMMA) || defined(ECTO_GAMMA) || defined(COUNT_NEIGHBORS)
Cassio Kirch's avatar
Cassio Kirch committed
72 73 74 75
        if (conductor -> type == ECTODERM)
          boid -> ectoNeighbors++;
        else /* Assume endo. */
          boid -> endoNeighbors++;
Cassio Kirch's avatar
Cassio Kirch committed
76
#endif
77

Cassio Kirch's avatar
Cassio Kirch committed
78
      }
Cassio Kirch's avatar
Cassio Kirch committed
79
    }
Cassio Kirch's avatar
Cassio Kirch committed
80 81
    conductor = conductor -> next;
  }
Cassio Kirch's avatar
Cassio Kirch committed
82 83 84 85 86 87 88 89 90 91
}

void
setNextVelocity (struct Boid* const boid, const struct Box box[])
{
  double sumVX = 0.0, sumVY = 0.0;    /* For alpha and velocity sum. */
  double uAngle, uX, uY;    /* For nu and random things. */
  double sumFX = 0.0, sumFY = 0.0;    /* For beta and force sum. */
  double sum, sumX, sumY;
  struct Boid *conductor;
92 93

#if defined (ENDO_GAMMA) || defined (ECTO_GAMMA)
Cassio Kirch's avatar
Cassio Kirch committed
94 95
  boid -> endoNeighbors = 0u;
  boid -> ectoNeighbors = 0u;
Cassio Kirch's avatar
Cassio Kirch committed
96
  boid -> gamma = 0.0;
97
#endif
Cassio Kirch's avatar
Cassio Kirch committed
98
  
Cassio Kirch's avatar
Cassio Kirch committed
99 100 101 102 103 104 105
  /* check neighbors in the same box */
  conductor = box[boid -> boxID].first;
  makeSum(boid, conductor, &sumFX, &sumFY, &sumVX, &sumVY);
  
  /* check neighbors in the north box */
  conductor = box[getNorthBoxID (boid -> boxID)].first;
  makeSum(boid, conductor, &sumFX, &sumFY, &sumVX, &sumVY);
Cassio Kirch's avatar
Cassio Kirch committed
106
  
Cassio Kirch's avatar
Cassio Kirch committed
107 108 109
  /* check neighbors in the south box */
  conductor = box[getSouthBoxID (boid -> boxID)].first;
  makeSum(boid, conductor, &sumFX, &sumFY, &sumVX, &sumVY);
Cassio Kirch's avatar
Cassio Kirch committed
110
  
Cassio Kirch's avatar
Cassio Kirch committed
111 112 113
  /* check neighbors in the west box */
  conductor = box[getWestBoxID (boid -> boxID)].first;
  makeSum(boid, conductor, &sumFX, &sumFY, &sumVX, &sumVY);
Cassio Kirch's avatar
Cassio Kirch committed
114
  
Cassio Kirch's avatar
Cassio Kirch committed
115 116 117
  /* check neighbors in the east box */
  conductor = box[getEastBoxID (boid -> boxID)].first;
  makeSum(boid, conductor, &sumFX, &sumFY, &sumVX, &sumVY);
Cassio Kirch's avatar
Cassio Kirch committed
118
  
Cassio Kirch's avatar
Cassio Kirch committed
119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144
  /* check neighbors in the northeast box */
  conductor = box[getEastBoxID (getNorthBoxID (boid -> boxID))].first;
  makeSum(boid, conductor, &sumFX, &sumFY, &sumVX, &sumVY);

  /* check neighbors in the southeast box */
  conductor = box[getEastBoxID (getSouthBoxID (boid -> boxID))].first;
  makeSum(boid, conductor, &sumFX, &sumFY, &sumVX, &sumVY);

  /* check neighbors in the northwest box */
  conductor = box[getWestBoxID (getNorthBoxID (boid -> boxID))].first;
  makeSum(boid, conductor, &sumFX, &sumFY, &sumVX, &sumVY);

  /* check neighbors in the southwest box */
  conductor = box[getWestBoxID (getSouthBoxID (boid -> boxID))].first;
  makeSum(boid, conductor, &sumFX, &sumFY, &sumVX, &sumVY);

  uAngle = RANDOM_0 (PI * 2.0);
  uX = cos (uAngle);
  uY = sin (uAngle);

  sumX = (double) ETA * uX + sumVX + sumFX;
  sumY = (double) ETA * uY + sumVY + sumFY;
  sum = sqrt (pow (sumX, 2.0) + pow (sumY, 2.0));

  boid -> newVelocity[X] = V0 * sumX / sum;
  boid -> newVelocity[Y] = V0 * sumY / sum;
Cassio Kirch's avatar
Cassio Kirch committed
145

146
#if defined (ENDO_GAMMA) || defined (ECTO_GAMMA)
Cassio Kirch's avatar
Cassio Kirch committed
147
  if (boid -> ectoNeighbors != 0u || boid -> endoNeighbors != 0u)
Cassio Kirch's avatar
Cassio Kirch committed
148 149
    boid -> gamma = (double)boid -> ectoNeighbors / \
      (boid -> endoNeighbors + boid -> ectoNeighbors);
150
#endif
Cassio Kirch's avatar
Cassio Kirch committed
151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211
}

void
setNextPosition (struct Boid* const boid)
{
  boid -> position[X] += boid -> newVelocity[X] * DT;
  boid -> position[Y] += boid -> newVelocity[Y] * DT;
  boid -> velocity[X] = boid -> newVelocity[X];
  boid -> velocity[Y] = boid -> newVelocity[Y];
}

void*
callNextPositionThread (void* const input)
{
  const struct Parameters* const parameters = input;
  struct Boid* const boid = parameters -> boid;  /* struct Boid array. */
  //struct Box* const box  = parameters  ->  box;  /* struct Box array. */

  unsigned int boidCount;

  for (boidCount = parameters -> left;
       boidCount < parameters -> right; ++boidCount)
    setNextPosition ((boid + boidCount));
  return NULL;
}

void*
callNextVelocityThread (void *input)
{
  const struct Parameters* const parameters = input;
  struct Boid* const boid = parameters -> boid;    /* struct Boid array. */
  struct Box* const box = parameters -> box;    /* struct Box array. */
  unsigned int boidCount;

  /*for (boidCount = parameters  ->  left;      \
     boidCount < parameters  ->  right;       \
     ++boidCount)
     checkLimits(boid+boidCount); */

  for (boidCount = parameters -> left;
       boidCount < parameters -> right; ++boidCount)
    setNextVelocity (boid + boidCount, box);
  return NULL;
}

void
nextStep (void* const parameters[])
{
  unsigned int threadID;

  for (threadID = 0; threadID < NUM_THREADS; ++threadID)
    pthread_create (&thread[threadID], NULL, callNextVelocityThread,
            parameters[threadID]);
  for (threadID = 0; threadID < NUM_THREADS; ++threadID)
    pthread_join (thread[threadID], NULL);
  for (threadID = 0; threadID < NUM_THREADS; ++threadID)
    pthread_create (&thread[threadID], NULL, callNextPositionThread,
            parameters[threadID]);
  for (threadID = 0; threadID < NUM_THREADS; ++threadID)
    pthread_join (thread[threadID], NULL);
}