void CParticleJetEffectPainter::CreateLinearParticles (CSpaceObject *pObj, int iCount, const CVector &vInitialPos, const CVector &vInitialVel)
// CreateLinearParticles
//
// Creates new particles on a straight line
{
int i;
// Compute some basic stuff
const Metric rJitterFactor = LIGHT_SPEED / 100000.0;
Metric rCurRotation = AngleToRadians(180 + m_iXformRotation + m_iCurDirection);
// Compute the spread angle, in radians
Metric rSpread = AngleToRadians(Max(0, m_SpreadAngle.Roll()));
Metric rHalfSpread = 0.5 * rSpread;
// Calculate where last tick's particles would be based on the last rotation.
Metric rAveSpeed = m_EmitSpeed.GetAveValue() * LIGHT_SPEED / 100.0;
CVector vCurStart = (m_vLastEmitPos + (m_rXformTime * ::PolarToVectorRadians(rCurRotation, rAveSpeed * g_SecondsPerUpdate))) - vInitialPos;
// Create particles
for (i = 0; i < iCount; i++)
{
Metric rSlide = mathRandom(0, 9999) / 10000.0;
// We place the particle along the line betwen the current
// and last emit positions
CVector vPos = vInitialPos + rSlide * vCurStart;
// Generate a random velocity backwards
Metric rRotation = rCurRotation + (rHalfSpread * mathRandom(-1000, 1000) / 1000.0);
Metric rSpeed = m_EmitSpeed.Roll() * LIGHT_SPEED / 100.0;
CVector vVel = m_rXformTime * (vInitialVel + ::PolarToVectorRadians(rRotation, rSpeed + rJitterFactor * mathRandom(-500, 500)));
// Lifetime
int iLifeLeft = m_ParticleLifetime.Roll();
// Add the particle
m_Particles.AddParticle(vPos, vVel, iLifeLeft, AngleToDegrees(rRotation));
}
// Remember the last position
m_iLastDirection = m_iCurDirection;
m_vLastEmitPos = vInitialPos;
}
void CTableOfDeviceGenerators::AddDevices (SDeviceGenerateCtx &Ctx)
// AddDevices
//
// Add devices
{
int i, j;
int iCount = m_Count.Roll();
for (j = 0; j < iCount; j++)
{
int iRoll = mathRandom(1, m_iTotalChance);
for (i = 0; i < m_Table.GetCount(); i++)
{
iRoll -= m_Table[i].iChance;
if (iRoll <= 0)
{
m_Table[i].pDevice->AddDevices(Ctx);
break;
}
}
}
}
void CLevelTableOfDeviceGenerators::AddDevices (SDeviceGenerateCtx &Ctx)
// AddDevices
//
// Adds devices
{
int i, j;
// Compute probabilities
if (Ctx.iLevel != m_iComputedLevel)
{
m_iTotalChance = 0;
for (i = 0; i < m_Table.GetCount(); i++)
{
m_Table[i].iChance = GetFrequencyByLevel(m_Table[i].sLevelFrequency, Ctx.iLevel);
m_iTotalChance += m_Table[i].iChance;
}
m_iComputedLevel = Ctx.iLevel;
}
// Generate
if (m_iTotalChance)
{
int iCount = m_Count.Roll();
for (i = 0; i < iCount; i++)
{
int iRoll = mathRandom(1, m_iTotalChance);
for (j = 0; j < m_Table.GetCount(); j++)
{
iRoll -= m_Table[j].iChance;
if (iRoll <= 0)
{
m_Table[j].pDevice->AddDevices(Ctx);
break;
}
}
}
}
}
void CGroupOfDeviceGenerators::AddDevices (SDeviceGenerateCtx &Ctx)
// AddDevices
//
// Add devices
{
int i, j;
int iCount = m_Count.Roll();
for (j = 0; j < iCount; j++)
{
for (i = 0; i < m_Table.GetCount(); i++)
{
if (mathRandom(1, 100) <= m_Table[i].iChance)
m_Table[i].pDevice->AddDevices(Ctx);
}
}
}
void CParticleJetEffectPainter::OnUpdate (SEffectUpdateCtx &Ctx)
// OnUpdate
//
// Update the painter
{
// Update the single-particle painter
if (m_pParticlePainter)
m_pParticlePainter->OnUpdate(Ctx);
// LATER: Support damage
#if 0
// If we have a wake potential or if the particles do damage
// then we need to hit test against all objects in the system.
Ctx.pDamageDesc = m_pCreator->GetDamageDesc();
Ctx.iWakePotential = m_pCreator->GetWakePotential();
if ((Ctx.pDamageDesc || Ctx.iWakePotential > 0) && Ctx.pSystem)
{
// Update
m_Particles.Update(Ctx);
}
#endif
// Create new particles
if (!Ctx.bFade)
CreateNewParticles(Ctx.pObj, m_EmitRate.Roll(), Ctx.vEmitPos, CalcInitialVel(Ctx.pObj));
else if (m_bUseObjectMotion && Ctx.pObj)
m_vLastEmitPos = Ctx.pObj->GetPos();
// If we're fading, reset direction (otherwise, when painting thruster
// effects we'll try to interpolate between stale directions).
if (Ctx.bFade)
m_iCurDirection = -1;
}
void CSingleDevice::AddDevices (SDeviceGenerateCtx &Ctx)
// AddDevices
//
// Add devices to list
{
int i;
if (m_pItemType == NULL)
return;
int iCount = m_Count.Roll();
for (i = 0; i < iCount; i++)
{
// Initialize the desc
SDeviceDesc Desc;
Desc.Item = CItem(m_pItemType, 1);
if (mathRandom(1, 100) <= m_iDamaged)
Desc.Item.SetDamaged();
else
m_Enhanced.EnhanceItem(Desc.Item);
// Find the default settings for the device slot for this device
SDeviceDesc SlotDesc;
bool bUseSlotDesc = (Ctx.pRoot ? Ctx.pRoot->FindDefaultDesc(Desc.Item, &SlotDesc) : false);
// Set the device position appropriately, either from the <Device> element,
// from the slot descriptor at the root, or from defaults.
if (!m_bDefaultPos)
{
Desc.iPosAngle = m_iPosAngle;
Desc.iPosRadius = m_iPosRadius;
Desc.iPosZ = m_iPosZ;
Desc.b3DPosition = m_b3DPosition;
}
else if (bUseSlotDesc)
{
Desc.iPosAngle = SlotDesc.iPosAngle;
Desc.iPosRadius = SlotDesc.iPosRadius;
Desc.iPosZ = SlotDesc.iPosZ;
Desc.b3DPosition = SlotDesc.b3DPosition;
}
// Set the device fire arc appropriately.
if (!m_bDefaultFireArc)
{
Desc.bOmnidirectional = m_bOmnidirectional;
Desc.iMinFireArc = m_iMinFireArc;
Desc.iMaxFireArc = m_iMaxFireArc;
}
else if (bUseSlotDesc)
{
Desc.bOmnidirectional = SlotDesc.bOmnidirectional;
Desc.iMinFireArc = SlotDesc.iMinFireArc;
Desc.iMaxFireArc = SlotDesc.iMaxFireArc;
}
// Set linked fire
if (!m_bDefaultLinkedFire)
Desc.dwLinkedFireOptions = m_dwLinkedFireOptions;
else if (bUseSlotDesc)
Desc.dwLinkedFireOptions = SlotDesc.dwLinkedFireOptions;
else
Desc.dwLinkedFireOptions = 0;
Desc.bSecondary = m_bSecondary;
// Slot bonus
if (!m_bDefaultSlotBonus)
Desc.iSlotBonus = m_iSlotBonus;
else if (bUseSlotDesc)
Desc.iSlotBonus = SlotDesc.iSlotBonus;
else
Desc.iSlotBonus = 0;
// Add extra items
if (m_pExtraItems)
{
CItemListManipulator ItemList(Desc.ExtraItems);
SItemAddCtx ItemCtx(ItemList);
ItemCtx.iLevel = Ctx.iLevel;
m_pExtraItems->AddItems(ItemCtx);
}
// Done
Ctx.pResult->AddDeviceDesc(Desc);
}
}
void CParticleJetEffectPainter::Paint (CG32bitImage &Dest, int x, int y, SViewportPaintCtx &Ctx)
// Paint
//
// Paint the effect
{
int iParticleLifetime = m_ParticleLifetime.GetMaxValue();
// Particles move the opposite direction from the shot
int iTrailDirection = Ctx.iRotation;
// If we're using the object center then we paint at the object center.
// Otherwise we paint at the given position.
int xPaint;
int yPaint;
if (m_bUseObjectCenter)
{
if (Ctx.pObj)
Ctx.XForm.Transform(Ctx.pObj->GetPos(), &xPaint, &yPaint);
else
{
// If we don't have an object then we use the viewport center. This
// handles the case where we paint in TransData (where there is
// no object).
xPaint = Ctx.xCenter;
yPaint = Ctx.yCenter;
}
}
else
{
xPaint = x;
yPaint = y;
}
// If we haven't created any particles yet, do it now
if (m_iCurDirection == -1
&& !Ctx.bFade)
{
m_iLastDirection = iTrailDirection;
m_iCurDirection = iTrailDirection;
// Figure out the position where we create particles
CVector vPos;
// If we're using the object center then it means that x,y is where
// we emit particles from. We need to convert from screen coordinates
// to object-relative coordinates.
if (m_bUseObjectCenter)
vPos = CVector((x - xPaint) * g_KlicksPerPixel, (yPaint - y) * g_KlicksPerPixel);
// Initialize last emit position
m_vLastEmitPos = (m_bUseObjectMotion && Ctx.pObj ? Ctx.pObj->GetPos() + vPos : vPos);
// Create particles
CreateNewParticles(Ctx.pObj, m_EmitRate.Roll(), vPos, CalcInitialVel(Ctx.pObj));
}
// Paint with the painter
if (m_pParticlePainter)
{
// If we can get a paint descriptor, use that because it is faster
SParticlePaintDesc Desc;
if (m_pParticlePainter->GetParticlePaintDesc(&Desc))
{
Desc.iMaxLifetime = iParticleLifetime;
m_Particles.Paint(Dest, xPaint, yPaint, Ctx, Desc);
}
// Otherwise, we use the painter for each particle
else
m_Particles.Paint(Dest, xPaint, yPaint, Ctx, m_pParticlePainter);
}
// Update
m_iCurDirection = iTrailDirection;
}
void CParticleJetEffectPainter::CreateInterpolatedParticles (CSpaceObject *pObj, int iCount, const CVector &vInitialPos, const CVector &vInitialVel)
// CreateInterpolatedParticles
//
// Creates particles interpolated between to directions.
{
int i;
// Compute some basic stuff
const Metric rJitterFactor = LIGHT_SPEED / 100000.0;
Metric rLastRotation = AngleToRadians(180 + m_iXformRotation + m_iLastDirection);
Metric rCurRotation = AngleToRadians(180 + m_iXformRotation + m_iCurDirection);
// Compute the spread angle, in radians
Metric rSpread = AngleToRadians(Max(0, m_SpreadAngle.Roll()));
Metric rHalfSpread = 0.5 * rSpread;
// Calculate where last tick's particles would be based on the last rotation.
Metric rAveSpeed = m_EmitSpeed.GetAveValue() * LIGHT_SPEED / 100.0;
CVector vLastStart = (m_vLastEmitPos + (m_rXformTime * ::PolarToVectorRadians(rLastRotation, rAveSpeed * g_SecondsPerUpdate))) - vInitialPos;
// Calculate where last tick's particles would be IF we have used the current
// rotation. This allows us to interpolate a turn.
CVector vCurStart = (m_vLastEmitPos + (m_rXformTime * ::PolarToVectorRadians(rCurRotation, rAveSpeed * g_SecondsPerUpdate))) - vInitialPos;
// Create particles
for (i = 0; i < iCount; i++)
{
Metric rSlide = mathRandom(0, 9999) / 10000.0;
// Compute two points along the two slide vectors (last and current)
CVector vSlide1 = rSlide * vLastStart;
CVector vSlide2 = rSlide * vCurStart;
CVector vAdj = (rSlide * vSlide1) + ((1.0 - rSlide) * vSlide2);
// We place the particle along the line betwen the current
// and last emit positions
CVector vPos = vInitialPos + vAdj;
// We blend the rotation as well
if (Absolute(rCurRotation - rLastRotation) > g_Pi)
{
if (rLastRotation < rCurRotation)
rLastRotation += g_Pi * 2.0;
else
rCurRotation += g_Pi * 2.0;
}
Metric rSlideRotation = (rSlide * rLastRotation) + ((1.0 - rSlide) * rCurRotation);
// Generate a random velocity backwards
Metric rRotation = rSlideRotation + (rHalfSpread * mathRandom(-1000, 1000) / 1000.0);
Metric rSpeed = m_EmitSpeed.Roll() * LIGHT_SPEED / 100.0;
CVector vVel = m_rXformTime * (vInitialVel + ::PolarToVectorRadians(rRotation, rSpeed + rJitterFactor * mathRandom(-500, 500)));
// Lifetime
int iLifeLeft = m_ParticleLifetime.Roll();
// Add the particle
m_Particles.AddParticle(vPos, vVel, iLifeLeft, AngleToDegrees(rRotation));
}
// Remember the last position
m_iLastDirection = m_iCurDirection;
m_vLastEmitPos = vInitialPos;
}
void CParticleJetEffectPainter::CreateFixedParticles (CSpaceObject *pObj, int iCount, const CVector &vInitialPos, const CVector &vInitialVel)
// CreateFixedParticles
//
// Creates particles along the objects path (e.g., missile exhaust).
{
int i;
// Calculate a vector to our previous position
//
// NOTE: In this mode m_vLastEmitPos is the last position of the object.
CVector vCurPos = (pObj ? pObj->GetPos() : CVector());
CVector vToOldPos;
if (m_bTrackingObject)
{
Metric rAveSpeed = m_rXformTime * m_EmitSpeed.GetAveValue() * LIGHT_SPEED / 100.0;
vToOldPos = m_vLastEmitPos - (vCurPos + vInitialPos) + ::PolarToVector(180 + m_iLastDirection, rAveSpeed * g_SecondsPerUpdate);
}
else
{
Metric rSpeed = (pObj ? pObj->GetVel().Length() : 0.0);
vToOldPos = ::PolarToVector(180 + m_iLastDirection, rSpeed * g_SecondsPerUpdate);
}
// Compute two orthogonal coordinates
CVector vAxis = ::PolarToVector(m_iCurDirection + 180, 1.0);
CVector vTangent = ::PolarToVector(m_iCurDirection + 90, 1.0);
// Create particles
for (i = 0; i < iCount; i++)
{
Metric rSlide = mathRandom(0, 9999) / 10000.0;
// Compute a position randomly along the line between the current and
// last emit positions.
CVector vPos = vInitialPos + rSlide * vToOldPos;
// Generate a random velocity along the tangent
Metric rTangentSlide = mathRandom(-9999, 9999) / 10000.0;
Metric rAxisJitter = mathRandom(-50, 50) / 100.0;
CVector vVel = (vTangent * rTangentSlide * m_rXformTime * m_TangentSpeed.Roll() * LIGHT_SPEED / 100.0)
+ (vAxis * (m_EmitSpeed.Roll() + rAxisJitter) * LIGHT_SPEED / 100.0);
// Lifetime
int iLifeLeft = m_ParticleLifetime.Roll();
// Add the particle
m_Particles.AddParticle(vPos, vVel, iLifeLeft, m_iCurDirection);
}
// Remember the last position
m_iLastDirection = m_iCurDirection;
m_vLastEmitPos = vCurPos + vInitialPos;
}
