Java Vec2.set方法代碼示例

import org.jbox2d.common.Vec2; //導入方法依賴的package包/類
/**
 * this returns pooled objects. don't keep or modify them
 * 
 * @return
 */
public void getClosestPoint(final Vec2 out) {
  switch (m_count) {
    case 0:
      assert (false);
      out.setZero();
      return;
    case 1:
      out.set(m_v1.w);
      return;
    case 2:
      case22.set(m_v2.w).mulLocal(m_v2.a);
      case2.set(m_v1.w).mulLocal(m_v1.a).addLocal(case22);
      out.set(case2);
      return;
    case 3:
      out.setZero();
      return;
    default:
      assert (false);
      out.setZero();
      return;
  }
}
 

import org.jbox2d.common.Vec2; //導入方法依賴的package包/類
public final void computeCentroidToOut(final Vec2[] vs, final int count, final Vec2 out) {
  assert (count >= 3);

  out.set(0.0f, 0.0f);
  float area = 0.0f;

  // pRef is the reference point for forming triangles.
  // It's location doesn't change the result (except for rounding error).
  final Vec2 pRef = pool1;
  pRef.setZero();

  final Vec2 e1 = pool2;
  final Vec2 e2 = pool3;

  final float inv3 = 1.0f / 3.0f;

  for (int i = 0; i < count; ++i) {
    // Triangle vertices.
    final Vec2 p1 = pRef;
    final Vec2 p2 = vs[i];
    final Vec2 p3 = i + 1 < count ? vs[i + 1] : vs[0];

    e1.set(p2).subLocal(p1);
    e2.set(p3).subLocal(p1);

    final float D = Vec2.cross(e1, e2);

    final float triangleArea = 0.5f * D;
    area += triangleArea;

    // Area weighted centroid
    e1.set(p1).addLocal(p2).addLocal(p3).mulLocal(triangleArea * inv3);
    out.addLocal(e1);
  }

  // Centroid
  assert (area > Settings.EPSILON);
  out.mulLocal(1.0f / area);
}
 

import org.jbox2d.common.Vec2; //導入方法依賴的package包/類
public void getWitnessPoints(Vec2 pA, Vec2 pB) {
  switch (m_count) {
    case 0:
      assert (false);
      break;

    case 1:
      pA.set(m_v1.wA);
      pB.set(m_v1.wB);
      break;

    case 2:
      case2.set(m_v1.wA).mulLocal(m_v1.a);
      pA.set(m_v2.wA).mulLocal(m_v2.a).addLocal(case2);
      // m_v1.a * m_v1.wA + m_v2.a * m_v2.wA;
      // *pB = m_v1.a * m_v1.wB + m_v2.a * m_v2.wB;
      case2.set(m_v1.wB).mulLocal(m_v1.a);
      pB.set(m_v2.wB).mulLocal(m_v2.a).addLocal(case2);

      break;

    case 3:
      pA.set(m_v1.wA).mulLocal(m_v1.a);
      case3.set(m_v2.wA).mulLocal(m_v2.a);
      case33.set(m_v3.wA).mulLocal(m_v3.a);
      pA.addLocal(case3).addLocal(case33);
      pB.set(pA);
      // *pA = m_v1.a * m_v1.wA + m_v2.a * m_v2.wA + m_v3.a * m_v3.wA;
      // *pB = *pA;
      break;

    default:
      assert (false);
      break;
  }
}
 

import org.jbox2d.common.Vec2; //導入方法依賴的package包/類
@Override
  public void solveVelocityConstraints(final SolverData data) {

    Vec2 vB = data.velocities[m_indexB].v;
    float wB = data.velocities[m_indexB].w;

    // Cdot = v + cross(w, r)
    final Vec2 Cdot = pool.popVec2();
    Vec2.crossToOutUnsafe(wB, m_rB, Cdot);
    Cdot.addLocal(vB);

    final Vec2 impulse = pool.popVec2();
    final Vec2 temp = pool.popVec2();

    temp.set(m_impulse).mulLocal(m_gamma).addLocal(m_C).addLocal(Cdot).negateLocal();
    Mat22.mulToOutUnsafe(m_mass, temp, impulse);

    Vec2 oldImpulse = temp;
    oldImpulse.set(m_impulse);
    m_impulse.addLocal(impulse);
    float maxImpulse = data.step.dt * m_maxForce;
    if (m_impulse.lengthSquared() > maxImpulse * maxImpulse) {
      m_impulse.mulLocal(maxImpulse / m_impulse.length());
    }
    impulse.set(m_impulse).subLocal(oldImpulse);

    vB.x += m_invMassB * impulse.x;
    vB.y += m_invMassB * impulse.y;
    wB += m_invIB * Vec2.cross(m_rB, impulse);

//    data.velocities[m_indexB].v.set(vB);
    data.velocities[m_indexB].w = wB;
    
    pool.pushVec2(3);
  }
 

import org.jbox2d.common.Vec2; //導入方法依賴的package包/類
public Vec2 getBox2screen(float in_box_x, float in_box_y, Vec2 out_screen){
  xy1[0] = in_box_x;
  xy1[1] = in_box_y;
  mat_box2screen.mult(xy1, xy2);
  if(out_screen == null){
    return new Vec2(xy2[0], xy2[1]);
  }
  return out_screen.set(xy2[0], xy2[1]);
}
 

import org.jbox2d.common.Vec2; //導入方法依賴的package包/類
public Vec2 getScreen2box(float in_screen_x, float in_screen_y, Vec2 out_box){
  xy1[0] = in_screen_x;
  xy1[1] = in_screen_y;
  mat_screen2box.mult(xy1, xy2);
  if(out_box == null){
    return new Vec2(xy2[0], xy2[1]);
  }
  return out_box.set(xy2[0], xy2[1]);
}
 

import org.jbox2d.common.Vec2; //導入方法依賴的package包/類
@Override
public boolean reportParticle(int index) {
  Vec2 particle_pos = world.getParticlePositionBuffer()[index];
  if (query_shape.testPoint(xf, particle_pos)) {
    Vec2 particle_vel = world.getParticleVelocityBuffer()[index];
    particle_vel.set(vel);
  }
  return true;
}
 

import org.jbox2d.common.Vec2; //導入方法依賴的package包/類
@Override
public void getAnchorA(Vec2 out) {
  out.set(m_bodyA.getPosition());
}
 

import org.jbox2d.common.Vec2; //導入方法依賴的package包/類
@Override
public void getAnchorB(Vec2 out) {
  out.set(m_bodyB.getPosition());
}
 

import org.jbox2d.common.Vec2; //導入方法依賴的package包/類
/**
 * Get the target linear offset, in frame A, in meters.
 */
public void getLinearOffset(Vec2 out) {
  out.set(m_linearOffset);
}
 

import org.jbox2d.common.Vec2; //導入方法依賴的package包/類
@Override
public void getReactionForce(float inv_dt, Vec2 argOut) {
  argOut.set(m_impulse.x, m_impulse.y);
  argOut.mulLocal(inv_dt);
}
 

import org.jbox2d.common.Vec2; //導入方法依賴的package包/類
@Override
public void getAnchorA(Vec2 argOut) {
  argOut.set(m_targetA);
}
 

import org.jbox2d.common.Vec2; //導入方法依賴的package包/類
/**
 * Set the mass properties to override the mass properties of the fixtures. Note that this changes
 * the center of mass position. Note that creating or destroying fixtures can also alter the mass.
 * This function has no effect if the body isn't dynamic.
 * 
 * @param massData the mass properties.
 */
public final void setMassData(MassData massData) {
  // TODO_ERIN adjust linear velocity and torque to account for movement of center.
  assert (m_world.isLocked() == false);
  if (m_world.isLocked() == true) {
    return;
  }

  if (m_type != BodyType.DYNAMIC) {
    return;
  }

  m_invMass = 0.0f;
  m_I = 0.0f;
  m_invI = 0.0f;

  m_mass = massData.mass;
  if (m_mass <= 0.0f) {
    m_mass = 1f;
  }

  m_invMass = 1.0f / m_mass;

  if (massData.I > 0.0f && (m_flags & e_fixedRotationFlag) == 0) {
    m_I = massData.I - m_mass * Vec2.dot(massData.center, massData.center);
    assert (m_I > 0.0f);
    m_invI = 1.0f / m_I;
  }

  final Vec2 oldCenter = m_world.getPool().popVec2();
  // Move center of mass.
  oldCenter.set(m_sweep.c);
  m_sweep.localCenter.set(massData.center);
  // m_sweep.c0 = m_sweep.c = Mul(m_xf, m_sweep.localCenter);
  Transform.mulToOutUnsafe(m_xf, m_sweep.localCenter, m_sweep.c0);
  m_sweep.c.set(m_sweep.c0);

  // Update center of mass velocity.
  // m_linearVelocity += Cross(m_angularVelocity, m_sweep.c - oldCenter);
  final Vec2 temp = m_world.getPool().popVec2();
  temp.set(m_sweep.c).subLocal(oldCenter);
  Vec2.crossToOut(m_angularVelocity, temp, temp);
  m_linearVelocity.addLocal(temp);

  m_world.getPool().pushVec2(2);
}
 

import org.jbox2d.common.Vec2; //導入方法依賴的package包/類
/**
 * Takes the world coordinates and puts the corresponding screen coordinates in argScreen.
 * 
 * @param worldX
 * @param worldY
 * @param argScreen
 */
public void getWorldToScreenToOut(float worldX, float worldY, Vec2 argScreen) {
  argScreen.set(worldX, worldY);
  viewportTransform.getWorldToScreen(argScreen, argScreen);
}
 

import org.jbox2d.common.Vec2; //導入方法依賴的package包/類
/**
 * takes the screen coordinates and puts the corresponding world coordinates in argWorld.
 * 
 * @param screenX
 * @param screenY
 * @param argWorld
 */
public void getScreenToWorldToOut(float screenX, float screenY, Vec2 argWorld) {
  argWorld.set(screenX, screenY);
  viewportTransform.getScreenToWorld(argWorld, argWorld);
}