private GravitationParas CreateGravitationParas(IAffectedMovableObject affectedObj)
{
// 偏移计算
float velocityOffset = _velocityOffset == 0 ? 0 : MTRandom.GetNextFloat(-_velocityOffset, _velocityOffset);
float acceOffset = _acceOffset == 0 ? 0 : MTRandom.GetNextFloat(-_acceOffset, _acceOffset);
// 计算实际的额外运动参数
float v = _velocity + velocityOffset;
float acce = _acce + acceOffset;
float vAngle = _vAngle, accAngle = _accAngle;
// 中心吸力
if (_fieldType == GravitationType.Centripetal)
{
Vector2 affectObjectPos = affectedObj.GetPosition();
Vector2 fieldPos = _curPos;
float angle = MathUtil.GetAngleBetweenXAxis(fieldPos - affectObjectPos);
vAngle = angle;
accAngle = angle;
}
// 中心斥力
else if (_fieldType == GravitationType.Centrifugal)
{
Vector2 affectObjectPos = affectedObj.GetPosition();
Vector2 fieldPos = _curPos;
float angle = MathUtil.GetAngleBetweenXAxis(affectObjectPos - fieldPos);
vAngle = angle;
accAngle = angle;
}
// 只有普通立场才计算偏移
if (_fieldType == GravitationType.Normal)
{
float vAngleOffset = _vAngleOffset == 0 ? 0 : MTRandom.GetNextFloat(-_vAngleOffset, _vAngleOffset);
float accAngleOffset = _accAngleOffset == 0 ? 0 : MTRandom.GetNextFloat(-_accAngleOffset, _accAngleOffset);
// 计算速度方向以及加速度方向
vAngle += vAngleOffset;
accAngle += accAngleOffset;
}
GravitationParas paras = new GravitationParas
{
velocity = v,
vAngle = vAngle,
acce = acce,
accAngle = accAngle,
};
return(paras);
}
private void CollidedByObject(IAffectedMovableObject affectedObject)
{
int curTime = STGStageManager.GetInstance().GetFrameSinceStageStart();
GravitationParas paras;
if (_affectedObjectDic.TryGetValue(affectedObject, out paras))
{
if (curTime - paras.lastUpdateTime == 1)
{
// 每帧重新计算向心力、离心力的角度
if (_fieldType == GravitationType.Centripetal)
{
paras.vAngle = MathUtil.GetAngleBetweenXAxis(_curPos - affectedObject.GetPosition());
paras.accAngle = paras.vAngle;
}
else if (_fieldType == GravitationType.Centrifugal)
{
paras.vAngle = MathUtil.GetAngleBetweenXAxis(affectedObject.GetPosition() - _curPos);
paras.accAngle = paras.vAngle;
}
paras.timeInGravitationField++;
}
else
{
paras = CreateGravitationParas(affectedObject);
paras.timeInGravitationField = 1;
}
}
else
{
paras = CreateGravitationParas(affectedObject);
paras.timeInGravitationField = 1;
}
paras.lastUpdateTime = curTime;
_affectedObjectDic[affectedObject] = paras;
// 设置额外运动参数
affectedObject.AddExtraSpeedParas(paras.velocity, paras.vAngle, paras.acce * paras.timeInGravitationField, paras.accAngle);
}
