Function avoidBullet

src/bzflag/AutoPilot.cpp:231–305

static bool avoidBullet(float& rotation, float& speed) {
  LocalPlayer* myTank = LocalPlayer::getMyTank();
  if (!myTank) {
    return false;
  }

  const fvec3& pos = myTank->getPosition();

  if ((myTank->getFlagType() == Flags::Narrow) ||
      (myTank->getFlagType() == Flags::Burrow)) {
    return false;  // take our chances
  }

  float minDistance;
  ShotPath* shot = findWorstBullet(minDistance);

  if ((shot == NULL) || (minDistance > 100.0f)) {
    return false;
  }

  const fvec3& shotPos = shot->getPosition();
  const fvec3& shotVel = shot->getVelocity();
  float shotAngle = atan2f(shotVel[1], shotVel[0]);
  float shotUnitVec[2] = {cosf(shotAngle), sinf(shotAngle)};

  float trueVec[2] = {(pos[0] - shotPos[0]) / minDistance, (pos[1] - shotPos[1]) / minDistance};
  float dotProd = trueVec[0] * shotUnitVec[0] + trueVec[1] * shotUnitVec[1];

  World* world = World::getWorld();
  if (!world) {
    return false;
  }

  if ((myTank->canJump())
      && (minDistance < (std::max(dotProd, 0.5f) * BZDBCache::tankLength * 2.25f))) {
    wantJump = true;
    return (myTank->getFlagType() != Flags::Wings);
  }
  else if (dotProd > 0.96f) {
    speed = 1.0;
    float myAzimuth = myTank->getAngle();
    float rotation1 = TargetingUtils::normalizeAngle((float)((shotAngle + M_PI / 2.0) - myAzimuth));

    float rotation2 = TargetingUtils::normalizeAngle((float)((shotAngle - M_PI / 2.0) - myAzimuth));

    float zCross = shotUnitVec[0] * trueVec[1] - shotUnitVec[1] * trueVec[0];

    if (zCross > 0.0f) { //if i am to the left of the shot from shooter pov
      rotation = rotation1;
      if (fabs(rotation1) < fabs(rotation2)) {
        speed = 1.0f;
      }
      else if (dotProd > 0.98f) {
        speed = -0.5f;
      }
      else {
        speed = 0.5f;
      }