void BulletSwayOperator::operateBulletEventSystem(Real timeElapsed)
{
BulletEventSystem::BulletSystemVecotor::iterator it = m_parent->getActiveBulletSystem().begin();
while(it != m_parent->getActiveBulletSystem().end())
{
BulletSystem* pBulletSystem = *it;
if(pBulletSystem && pBulletSystem->getIsCreated())
{
// 步骤：[6/2/2010 陈军龙]
// 1.计算朝向
// 2.计算摇摆方向（与朝向垂直，且与地面平行）
// 3.将时间映射到曲线函数Sin （映射公式： (2 * PI) / (1 / Frequency) = x / Age ）
// 4.更新子弹位置
static Ogre::Vector3 startpos = pBulletSystem->getCurrentPosition();
Ogre::Vector3 direction = pBulletSystem->getTargetPosition() - startpos;
direction.normalise();
Real fCumulateTime = pBulletSystem->getAge();
Ogre::Vector2 swaydir(direction.z, -direction.x);
Real offset = m_amplitude * Ogre::Math::Sin(fCumulateTime * Ogre::Math::TWO_PI * m_frequency);
Ogre::Vector2 absoffset = swaydir * offset;
TransformInfo info;
info = pBulletSystem->getTransformInfo();
Ogre::Vector3 vBulletPosition = info.mPosition;
vBulletPosition.x += absoffset.x;
vBulletPosition.z += absoffset.y;
info.mPosition = vBulletPosition;
pBulletSystem->setTransformInfo(info);
pBulletSystem->setPosition(info.mPosition);
}
it ++;
}
}
void BulletHelixOperator::operateBulletEventSystem(Real timeElapsed)
{
BulletEventSystem::BulletSystemVecotor::iterator it = m_parent->getActiveBulletSystem().begin();
while(it != m_parent->getActiveBulletSystem().end())
{
BulletSystem* pBulletSystem = *it;
if(pBulletSystem && pBulletSystem->getIsCreated())
{
// 步骤：[6/2/2010 陈军龙]
// 1.计算朝向
// 2.将时间映射到曲线函数Sin （映射公式： (2 * PI) / (1 / Frequency) = x / Age ）
// 3.计算绕螺旋的旋转轴的旋转偏移量
// （绕任意轴旋转公式：v' = (v - (v 。n) 。n) * cosx + (v * n) * sinx + (v 。n)。n
// 其中的 。代表点乘 * 代表叉乘，v是要旋转的向量，n是旋转轴，x是旋转的角度）
// 4.根据到目标的百分比设置振幅，更新子弹位置
static Ogre::Vector3 startpos = pBulletSystem->getCurrentPosition();
Ogre::Vector3 direction = pBulletSystem->getTargetPosition() - startpos;
direction.normalise();
Real fCumulateTime = pBulletSystem->getAge();
Real sinvalue = Ogre::Math::Sin(fCumulateTime * Ogre::Math::TWO_PI * m_frequency);
Real cosvalue = Ogre::Math::Cos(fCumulateTime * Ogre::Math::TWO_PI * m_frequency);
Ogre::Vector3 absoffset, vdelta;
vdelta = Ogre::Vector3::UNIT_Y;//此次设置为Y轴，也可以设置为其它
// v' = (v - (v 。n) 。n) * cosx + (v * n) * sinx + (v 。n)。n
absoffset = (vdelta - (vdelta.dotProduct(direction)) * direction) * cosvalue
+ (vdelta.crossProduct(direction)) * sinvalue
+ (vdelta.dotProduct(direction)) *direction;
Real oridistance = startpos.distance(pBulletSystem->getTargetPosition());
Real curdistance = pBulletSystem->getCurrentPosition().distance(pBulletSystem->getTargetPosition());
Real percent = Ogre::Math::RealEqual(oridistance, 0) ? 1 : curdistance/oridistance;
TransformInfo info;
info = pBulletSystem->getTransformInfo();
Ogre::Vector3 vBulletPosition = info.mPosition;
vBulletPosition += (m_amplitude * absoffset * percent);
info.mPosition = vBulletPosition;
pBulletSystem->setTransformInfo(info);
pBulletSystem->setPosition(info.mPosition);
}
it ++;
}
}
