How to use

getParticleMass

method

in

org.jbox2d.particle.ParticleSystem

public float computeParticleCollisionEnergy() {
 float sum_v2 = 0;
 for (int k = 0; k < m_contactCount; k++) {
  final ParticleContact contact = m_contactBuffer[k];
  int a = contact.indexA;
  int b = contact.indexB;
  Vec2 n = contact.normal;
  final Vec2 va = m_velocityBuffer.data[a];
  final Vec2 vb = m_velocityBuffer.data[b];
  final float vx = vb.x - va.x;
  final float vy = vb.y - va.y;
  float vn = vx * n.x + vy * n.y;
  if (vn < 0) {
   sum_v2 += vn * vn;
  }
 }
 return 0.5f * getParticleMass() * sum_v2;
}

public void updateStatistics() {
 if (m_timestamp != m_system.m_timestamp) {
  float m = m_system.getParticleMass();
  m_mass = 0;
  m_center.setZero();

public float computeParticleCollisionEnergy() {
 float sum_v2 = 0;
 for (int k = 0; k < m_contactCount; k++) {
  final ParticleContact contact = m_contactBuffer[k];
  int a = contact.indexA;
  int b = contact.indexB;
  Vec2 n = contact.normal;
  final Vec2 va = m_velocityBuffer.data[a];
  final Vec2 vb = m_velocityBuffer.data[b];
  final float vx = vb.x - va.x;
  final float vy = vb.y - va.y;
  float vn = vx * n.x + vy * n.y;
  if (vn < 0) {
   sum_v2 += vn * vn;
  }
 }
 return 0.5f * getParticleMass() * sum_v2;
}

av.x = vx;
av.y = vy;
final float particleMass = system.getParticleMass();
final float ax = particleMass * (av.x - vx);
final float ay = particleMass * (av.y - vy);

public void updateStatistics() {
 if (m_timestamp != m_system.m_timestamp) {
  float m = m_system.getParticleMass();
  m_mass = 0;
  m_center.setZero();

public float computeParticleCollisionEnergy() {
 float sum_v2 = 0;
 for (int k = 0; k < m_contactCount; k++) {
  final ParticleContact contact = m_contactBuffer[k];
  int a = contact.indexA;
  int b = contact.indexB;
  Vec2 n = contact.normal;
  final Vec2 va = m_velocityBuffer.data[a];
  final Vec2 vb = m_velocityBuffer.data[b];
  final float vx = vb.x - va.x;
  final float vy = vb.y - va.y;
  float vn = vx * n.x + vy * n.y;
  if (vn < 0) {
   sum_v2 += vn * vn;
  }
 }
 return 0.5f * getParticleMass() * sum_v2;
}

public float computeParticleCollisionEnergy() {
  float sum_v2 = 0;
  for (int k = 0; k < m_contactCount; k++) {
    final ParticleContact contact = m_contactBuffer[k];
    int a = contact.indexA;
    int b = contact.indexB;
    Vec2 n = contact.normal;
    final Vec2 va = m_velocityBuffer.data[a];
    final Vec2 vb = m_velocityBuffer.data[b];
    final float vx = vb.x - va.x;
    final float vy = vb.y - va.y;
    float vn = vx * n.x + vy * n.y;
    if (vn < 0) {
      sum_v2 += vn * vn;
    }
  }
  return 0.5f * getParticleMass() * sum_v2;
}

av.x = vx;
av.y = vy;
final float particleMass = system.getParticleMass();
final float ax = particleMass * (av.x - vx);
final float ay = particleMass * (av.y - vy);

public void updateStatistics() {
  if (m_timestamp != m_system.m_timestamp) {
    float m = m_system.getParticleMass();
    m_mass = 0;
    m_center.setZero();

public void updateStatistics() {
 if (m_timestamp != m_system.m_timestamp) {
  float m = m_system.getParticleMass();
  m_mass = 0;
  m_center.setZero();

av.x = vx;
av.y = vy;
final float particleMass = system.getParticleMass();
final float ax = particleMass * (av.x - vx);
final float ay = particleMass * (av.y - vy);

av.x = vx;
av.y = vy;
final float particleMass = system.getParticleMass();
final float ax = particleMass * (av.x - vx);
final float ay = particleMass * (av.y - vy);