Bool View::GetNearestPoint (PCURVE pCurve, POINT SPos, ULong& iPnt)
{
FP x,y;
GetWorldPos (SPos, x, y);
ULong n;
FP min = 1e9;
Bool lock = FALSE;
for (n=0; n<pCurve->cPoints; n++)
{
FP dist = FSqrt (((x - pCurve->CurveData[n].index) * (x - pCurve->CurveData[n].index)) +
((y - pCurve->CurveData[n].value) * (y - pCurve->CurveData[n].value)));
if (dist < min)
{
iPnt = n;
lock = TRUE;
min = dist;
}
}
return lock;
}
//컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴
//Procedure ProcessPistonEngine
//Author Craig Beeston
//Date Tue 11 Aug 98
//
//Description Processes a piston engine
// Calculates Thrust, Torque, Engine power and Engine speed
//
//Inputs
//
//Returns
//
//------------------------------------------------------------------------------
void Engine::ProcessPistonEngine (AirStrucPtr const ControlledAC)
{
AircraftAnimData* adptr = (AircraftAnimData *)ControlledAC->Anim;
SWord iDamage = 255 - (255 - UWord(adptr->ENGINELEFT)) * (255 - UWord(adptr->FRONT)) / 255;
if(pThrustPoint->Pos.x > 0)
iDamage = adptr->ENGINERIGHT;
FP MaxSpeed = 2 * Rpm100 * 0.001047197; //RPM 2 Rads/cs
if(iDamage == 254)
MaxSpeed = 0;
FP fDamage = 1.0 - FP(iDamage) * (1.0 / 255.0);
//DEADCODE CB 04/11/99 FP MinSpeed = Rpm0 * 0.001047197; //RPM 2 Rads/cs
//DEADCODE CB 04/11/99 if (Speed < MinSpeed) Speed = MinSpeed;
if (Speed > MaxSpeed) Speed = MaxSpeed;
FP EngRPM = Speed * 954.9296586;
FP PropSpeed = Speed * GearRatio;
FP PropSwirl = SlipRot * 0.5;
const FP BladeFract = 0.60;
FCRD Vel;
CPrd(Vel, pThrustPoint->Pos, pModel->RotVel);
Vel.z -= pModel->AirVel.z; //Velocity of air ahead of prop
FP PropAirVel = BladeFract * (PropSpeed - PropSwirl) * BladeRadius;
FP InflowAng = CalcAngle (PropAirVel, PropVel);
//Automatic prop control for AI aircraft
if((!Save_Data.flightdifficulty [FD_PROPPITCH]) || (ControlledAC != Persons2::PlayerSeenAC))
{
switch(PropType)
{
case PT_FIXED:
break;
case PT_2PITCH:
if(EngRPM > 1.15 * Rpm100)
PropSetting = 0;
if(EngRPM < 0.7 * Rpm100)
PropSetting = 1;
break;
case PT_VARIABLE:
PropSetting = 1.0 - 1.15 * ControlledAC->vel_ / ControlledAC->classtype->maxvel;
MODMAXMIN(PropSetting, 0.01, 1);
break;
case PT_CONSTSPEED:
if(ThrottleSetting <= 75)
PropSetting = 0;
else
PropSetting = (ThrottleSetting - 75.0) / 25.0;
//DEADCODE CSB 31/01/00 PropSetting = FP(ThrottleSetting) * 0.01;
//DEADCODE CSB 31/01/00 PropSetting = PropSetting * PropSetting * PropSetting;
break;
}
}
switch(PropType)
{
case PT_FIXED:
{
PropInc = PropMaxPitch;
break;
}
case PT_2PITCH:
{
FP DesiredInc = PropMaxPitch;
if(PropSetting > 0.5)
DesiredInc = PropMinPitch;
if(DesiredInc > PropInc)
{
PropInc += 0.002 * MODEL_ENGINE_DT; //AMM 24Nov99
if(PropInc > DesiredInc) PropInc = DesiredInc;
}
if(DesiredInc < PropInc)
{
PropInc -= 0.002 * MODEL_ENGINE_DT; //AMM 24Nov99
if(PropInc < DesiredInc) PropInc = DesiredInc;
}
break;
}
case PT_VARIABLE:
{
FP DesiredInc = PropMaxPitch;
if(PropSetting > 0)
{
FP Ratio = 0.5 * (PropSetting + 1.0);
DesiredInc = PropMinPitch * Ratio + PropMaxPitch * (1 - Ratio);
}
if(DesiredInc > PropInc)
{
PropInc += 0.002 * MODEL_ENGINE_DT; //AMM 24Nov99
if(PropInc > DesiredInc) PropInc = DesiredInc;
}
if(DesiredInc < PropInc)
{
PropInc -= 0.002 * MODEL_ENGINE_DT; //AMM 24Nov99
if(PropInc < DesiredInc) PropInc = DesiredInc;
}
break;
}
case PT_CONSTSPEED:
{
FP DesiredRpm = Rpm100 * (0.7 + 0.45 * PropSetting);
FP PropPitchRate = (EngRPM - DesiredRpm) * 0.00001;
PropInc += PropPitchRate * MODEL_ENGINE_DT; //AMM 24Nov99
break;
}
}
MODMAXMIN(PropInc, PropMinPitch, PropMaxPitch);
FP BladeSpeed = FSqrt(PropAirVel * PropAirVel + PropVel * PropVel);
FP BladeQS = 0.5 * pModel->AmbDensity * BladeSpeed * BladeArea;
//DeadCode AMM 29Jun99 J = PropVel / ((PropSpeed - PropSwirl) * 0.75 * BladeRadius); //Only Used for Text Screen
FP BladeL = 4.53 * (PropInc - InflowAng);
FP BladeD = 0.005 + (0.071 * BladeL * BladeL);
MODMAXMIN(BladeL, -1.0, 1.5);
BladeL *= BladeQS;
BladeD *= BladeQS;
Thrust = BladeL * PropAirVel - BladeD * PropVel;
Torque = BladeD * PropAirVel + BladeL * PropVel;
Torque *= BladeRadius * 0.5; //effective overall moment
//Engine Power Output
Power100 = pPower100->GetValue (EngRPM / Rpm100);
Power0 = pPower0->GetValue (EngRPM / Rpm100);
FP fPower = 0;
FP dTorque = 0;
ComplexEngineProcess(ControlledAC, fDamage, fPower, dTorque);
const FP MinThrottle = 0.125;
FP PowerFract = MinThrottle + ThrottleSetting * (1 - MinThrottle) * 0.01;
PowerFract *= fPower;
FP oldpower = Power;
Power = Power0 + ((Power100 - Power0) * PowerFract);
if((oldpower <= 0) && (Power > 0))
Trans_Obj.LaunchEngineStartup((mobileitem*)ControlledAC, *ControlledAC->currworld);
if((oldpower > 0) && (Power <= 0) && (ControlledAC == Persons2::PlayerSeenAC))
_Miles.PlayOnce(FIL_SFX_ENGINE_COUGH,Save_Data.vol.engine); //RJS 27Sep00
Power *= pPowerAlt->GetValue(pModel->Pos.y * 0.01);
Power *= p0;
//#define ENGINE_DATA
#ifdef ENGINE_DATA
//DeadCode CSB 27/10/99 /* TEST CODE CSB 27/10/99 */if(pModel->bACM)
/* TEST CODE CSB 27/10/99 */{
//DEADCODE CSB 11/01/00 /* TEST CODE CSB 29/09/99 */ PrintVar(40, 15, "Gravity %.3f ", FP(pModel->Inst.I_NormalAcc));
//DEADCODE CSB 11/01/00 /* TEST CODE CSB 29/09/99 */ PrintVar(40, 16, "IAS %.2f ", FP(pModel->Speed * FSqrt (pModel->AmbDensity / 0.0001225)));
//DEADCODE CSB 11/01/00 /* TEST CODE CSB 29/09/99 */ PrintVar(40, 17, "Vel %.2f ", FP(ControlledAC->vel_ * 0.0001));
//DEADCODE CSB 11/01/00 /* TEST CODE CSB 29/09/99 */ PrintVar(40, 18, "DesRpm %.2f ", FP(pModel->ModelPropSetting));
/* TEST CODE CSB 29/09/99 */ PrintVar(20, 15, "Power %.0f ", FP(Power / 745.7));
/* TEST CODE CSB 29/09/99 */ PrintVar(20, 16, "RPM %.0f ", FP(EngRPM));
/* TEST CODE CSB 29/09/99 */ PrintVar(20, 17, "Prop Inc %.2f ", FP(Rads2Degs(PropInc)));
/* TEST CODE CSB 29/09/99 */ PrintVar(20, 18, "Vel %.2f ", FP(-pModel->AirVel.z));
/* TEST CODE CSB 29/09/99 */ PrintVar(20, 19, "PropVel %.2f ", FP(PropVel));
/* TEST CODE CSB 29/09/99 */ PrintVar(20, 20, "SlipVel %.2f ", FP(SlipVel));
/* TEST CODE CSB 29/09/99 */ PrintVar(20, 21, "Alpha %.2f ", FP(Rads2Degs(PropInc - InflowAng)));
/* TEST CODE CSB 29/09/99 */ PrintVar(20, 24, "ROC fpm %.0f ", FP(pModel->Vel.y * 3.2808 * 60.0));
/* TEST CODE CSB 29/09/99 */ PrintVar(20, 22, "Thrust %.1f ", FP(Thrust));
/* TEST CODE CSB 29/09/99 */ PrintVar(20, 23, "Eff %.3f ", FP(Thrust * -pModel->AirVel.z / Power));
/* TEST CODE CSB 27/10/99 */}
#endif
FP EngTorque = 0;
if(Speed > 0)
EngTorque = Power / Speed;
EngTorque += dTorque;
//Slipstream Conditions
FP OldSlipRot = SlipRot;
FP SlipInertia = BladeRadius * BladeRadius * BladeRadius * BladeRadius
* 0.5 * FPIE * PropVel * pModel->AmbDensity;
if(SlipInertia > 0)
SlipRot = (Torque / SlipInertia + OldSlipRot) * 0.5;
else
SlipRot = 0;
if(SlipRot > PropSpeed) SlipRot = PropSpeed;
FP OldSlipVel = SlipVel;
FP PropArea = FPIE * BladeRadius * BladeRadius;
FP TempSlip = 2 * Thrust / (pModel->AmbDensity * PropArea) + Vel.z * Vel.z;
if (TempSlip < 0) SlipVel = -Vel.z;
else
SlipVel = sqrt(TempSlip);
SlipVel = (SlipVel + OldSlipVel) * 0.5;
PropVel = 0.5 * (0.5 * (Vel.z + SlipVel) + PropVel);
// calc engine speed
FP EngRotAcc = (EngTorque - Torque * GearRatio) / MoI;
//DeadCode CSB 27/10/99 if (!Save_Data.flightdifficulty [FD_THRUSTPOWERCONTROL])
//DeadCode CSB 27/10/99 EngRotAcc *= 2; //Fast Spooling
//DEADCODE AMM 24/11/99 Speed += pModel->MODEL_DT * EngRotAcc;
Speed += MODEL_ENGINE_DT * EngRotAcc; //AMM 24/11/99
if(Speed < 0) Speed = 0;
//DEADCODE CB 04/11/99 if (Speed < MinSpeed) Speed = MinSpeed;
if (Speed > MaxSpeed) Speed = MaxSpeed;
Torque = -Torque * RotateDirection;//(EngTorque - Torque / GearRatio); //Reacted into Airframe
if (Save_Data.flightdifficulty [FD_SLIPSTREAMEFFECTS])
{
FCRD TempRot;
CopyVec(pModel->RotVel, TempRot);
TempRot.z += Speed * RotateDirection;
moment.x = TempRot.x * PropInertia.x;
moment.y = TempRot.y * PropInertia.y;
moment.z = TempRot.z * PropInertia.z;
CPrd(moment, moment, TempRot);
moment.x *= -1;
moment.y *= -1;
moment.z *= -1;
}
else
NullVec(moment);
}
