How to use

WorldManifold

in

com.badlogic.gdx.physics.box2d

private void drawContact (Contact contact) {
  WorldManifold worldManifold = contact.getWorldManifold();
  if (worldManifold.getNumberOfContactPoints() == 0) return;
  Vector2 point = worldManifold.getPoints()[0];
  renderer.point(point.x, point.y, 0);
}

int numPoints = contact.getWorldManifold().getNumberOfContactPoints();
for(int i = 0; i < numPoints; i++){
  Vector2 vector2 = ballBody.getLinearVelocityFromWorldPoint(worldManiFold.getPoints()[i]);
  if(vector2.y < 0) {
    contact.setEnabled(false);

private void drawContact (Contact contact) {
  WorldManifold worldManifold = contact.getWorldManifold();
  if (worldManifold.getNumberOfContactPoints() == 0) return;
  Vector2 point = worldManifold.getPoints()[0];
  renderer.setColor(getColorByBody(contact.getFixtureA().getBody()));
  renderer.point(point.x, point.y, 0);
}

private boolean isPlayerGrounded (float deltaTime) {
  groundedPlatform = null;
  Array<Contact> contactList = world.getContactList();
  for (int i = 0; i < contactList.size; i++) {
    Contact contact = contactList.get(i);
    if (contact.isTouching()
      && (contact.getFixtureA() == playerSensorFixture || contact.getFixtureB() == playerSensorFixture)) {
      Vector2 pos = player.getPosition();
      WorldManifold manifold = contact.getWorldManifold();
      boolean below = true;
      for (int j = 0; j < manifold.getNumberOfContactPoints(); j++) {
        below &= (manifold.getPoints()[j].y < pos.y - 1.5f);
      }
      if (below) {
        if (contact.getFixtureA().getUserData() != null && contact.getFixtureA().getUserData().equals("p")) {
          groundedPlatform = (Platform)contact.getFixtureA().getBody().getUserData();
        }
        if (contact.getFixtureB().getUserData() != null && contact.getFixtureB().getUserData().equals("p")) {
          groundedPlatform = (Platform)contact.getFixtureB().getBody().getUserData();
        }
        return true;
      }
      return false;
    }
  }
  return false;
}

int numContactPoints = manifold.getNumberOfContactPoints();
for (int j = 0; j < numContactPoints; j++) {
  Vector2 point = manifold.getPoints()[j];
  renderer.point(point.x, point.y, 0);

private void drawContact (Contact contact) {
  WorldManifold worldManifold = contact.getWorldManifold();
  if (worldManifold.getNumberOfContactPoints() == 0) return;
  Vector2 point = worldManifold.getPoints()[0];
  renderer.setColor(getColorByBody(contact.getFixtureA().getBody()));
  renderer.point(point.x, point.y, 0);
}

float ml = car.getCarModel().length;
float half_ml = ml * 0.5f;
Vector2[] pts = contact.getWorldManifold().getPoints();
int num_points = contact.getWorldManifold().getNumberOfContactPoints();
for (int i = 0; i < num_points; i++) {
  Vector2 lp = fcar.getBody().getLocalPoint(pts[i]);