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CParticleArray.cpp
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// CParticleArray.cpp
//
// CParticleArray object
#include "PreComp.h"
const int FIXED_POINT = 256;
const CG32bitPixel FLAME_CORE_COLOR = CG32bitPixel(255,241,230);
const CG32bitPixel FLAME_MIDDLE_COLOR = CG32bitPixel(255,208,0);
const CG32bitPixel FLAME_OUTER_COLOR = CG32bitPixel(255,59,27);
//const WORD FLAME_MIDDLE_COLOR = CG32bitPixel(248,200,12);
//const WORD FLAME_OUTER_COLOR = CG32bitPixel(189,30,0);
const int DEFAULT_LINE_LENGTH = 30;
#define PAINT_GASEOUS_PARTICLE(Dest,x,y,iWidth,rgbColor,iFade,iFade2) \
{ \
switch (iWidth) \
{ \
case 0: \
Dest.SetPixelTrans((x), (y), (rgbColor), (BYTE)(iFade)); \
break; \
\
case 1: \
Dest.SetPixelTrans((x), (y), (rgbColor), (BYTE)(iFade)); \
Dest.SetPixelTrans((x) + 1, (y), (rgbColor), (BYTE)(iFade2)); \
Dest.SetPixelTrans((x), (y) + 1, (rgbColor), (BYTE)(iFade2)); \
break; \
\
case 2: \
Dest.SetPixelTrans((x), (y), (rgbColor), (BYTE)(iFade)); \
Dest.SetPixelTrans((x) + 1, (y), (rgbColor), (BYTE)(iFade2)); \
Dest.SetPixelTrans((x), (y) + 1, (rgbColor), (BYTE)(iFade2)); \
Dest.SetPixelTrans((x) - 1, (y), (rgbColor), (BYTE)(iFade2)); \
Dest.SetPixelTrans((x), (y) - 1, (rgbColor), (BYTE)(iFade2)); \
break; \
\
case 3: \
Dest.SetPixelTrans((x), (y), (rgbColor), (BYTE)(iFade)); \
Dest.SetPixelTrans((x) + 1, (y), (rgbColor), (BYTE)(iFade)); \
Dest.SetPixelTrans((x), (y) + 1, (rgbColor), (BYTE)(iFade)); \
Dest.SetPixelTrans((x) - 1, (y), (rgbColor), (BYTE)(iFade)); \
Dest.SetPixelTrans((x), (y) - 1, (rgbColor), (BYTE)(iFade)); \
Dest.SetPixelTrans((x) + 1, (y) + 1, (rgbColor), (BYTE)(iFade2)); \
Dest.SetPixelTrans((x) + 1, (y) - 1, (rgbColor), (BYTE)(iFade2)); \
Dest.SetPixelTrans((x) - 1, (y) + 1, (rgbColor), (BYTE)(iFade2)); \
Dest.SetPixelTrans((x) - 1, (y) - 1, (rgbColor), (BYTE)(iFade2)); \
break; \
\
default: \
CGDraw::Circle(Dest, (x), (y), ((iWidth) + 1) / 2, CG32bitPixel((rgbColor), (BYTE)(iFade))); \
break; \
} \
}
CParticleArray::CParticleArray (void) :
m_iCount(0),
m_pArray(NULL),
m_iLastAdded(-1),
m_bUseRealCoords(false)
// CParticleArray constructor
{
m_rcBounds.left = 0;
m_rcBounds.top = 0;
m_rcBounds.right = 0;
m_rcBounds.bottom = 0;
}
CParticleArray::~CParticleArray (void)
// CParticleArray destructor
{
if (m_pArray)
delete [] m_pArray;
}
void CParticleArray::AddParticle (const CVector &vPos, const CVector &vVel, int iLifeLeft, int iRotation, int iDestiny, int iGeneration, Metric rData)
// AddParticle
//
// Adds a new particle to the array
{
ASSERT(iDestiny == -1 || (iDestiny >= 0 && iDestiny < g_DestinyRange));
if (m_iCount == 0)
return;
// Infinite loop without this.
if (m_iLastAdded == -1)
m_iLastAdded = m_iCount - 1;
// Look for an open slot
int iSlot = (m_iLastAdded + 1) % m_iCount;
while (iSlot != m_iLastAdded && m_pArray[iSlot].fAlive)
iSlot = (iSlot + 1) % m_iCount;
// If we're out of room, can't add
if (iSlot == m_iLastAdded)
return;
// Add the particle at the slot
SParticle *pParticle = &m_pArray[iSlot];
if (m_bUseRealCoords)
{
pParticle->Pos = vPos;
pParticle->Vel = (vVel * g_SecondsPerUpdate);
PosToXY(vPos, &pParticle->x, &pParticle->y);
// xVel and yVel are ignored if using real coords
}
else
{
PosToXY(vPos, &pParticle->x, &pParticle->y);
PosToXY(vVel * g_SecondsPerUpdate, &pParticle->xVel, &pParticle->yVel);
}
pParticle->iGeneration = iGeneration;
pParticle->iLifeLeft = iLifeLeft;
pParticle->iDestiny = (iDestiny == -1 ? mathRandom(0, g_DestinyRange - 1) : iDestiny);
pParticle->iRotation = iRotation;
pParticle->rData = rData;
pParticle->fAlive = true;
m_iLastAdded = iSlot;
}
void CParticleArray::CleanUp (void)
// CleanUp
//
// Deletes the array
{
if (m_pArray)
{
delete [] m_pArray;
m_pArray = NULL;
}
m_iCount = 0;
}
void CParticleArray::CreateInterpolatedParticles (const CParticleSystemDesc &Desc, CSpaceObject *pObj, int iCount, const CVector &vSource, const CVector &vSourceVel, int iDirection, int iTick)
// CreateInterpolatedParticles
//
// Creates particles interpolated between two directions.
{
int i;
ASSERT(iDirection != -1);
// Compute some basic stuff
const Metric rJitterFactor = LIGHT_SPEED / 100000.0;
Metric rLastRotation = mathDegreesToRadians(180 + Desc.GetXformRotation() + GetLastEmitDirection());
Metric rCurRotation = mathDegreesToRadians(180 + Desc.GetXformRotation() + iDirection);
// Compute the spread angle, in radians
Metric rSpread = mathDegreesToRadians(Max(0, Desc.GetSpreadAngle().Roll()));
Metric rHalfSpread = 0.5 * rSpread;
// Calculate where last tick's particles would be based on the last rotation.
Metric rAveSpeed = Desc.GetEmitSpeed().GetAveValue() * LIGHT_SPEED / 100.0;
CVector vLastStart = (GetLastEmitPos() + (Desc.GetXformTime() * ::PolarToVectorRadians(rLastRotation, rAveSpeed * g_SecondsPerUpdate))) - vSource;
// Calculate where last tick's particles would be IF we have used the current
// rotation. This allows us to interpolate a turn.
CVector vCurStart = (GetLastEmitPos() + (Desc.GetXformTime() * ::PolarToVectorRadians(rCurRotation, rAveSpeed * g_SecondsPerUpdate))) - vSource;
// 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 = vSource + vAdj;
// We blend the rotation as well
if (Absolute(rCurRotation - rLastRotation) > PI)
{
if (rLastRotation < rCurRotation)
rLastRotation += PI * 2.0;
else
rCurRotation += 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 = Desc.GetEmitSpeed().Roll() * LIGHT_SPEED / 100.0;
CVector vVel = Desc.GetXformTime() * (vSourceVel + ::PolarToVectorRadians(rRotation, rSpeed + rJitterFactor * mathRandom(-500, 500)));
// Lifetime
int iLifeLeft = Desc.GetParticleLifetime().Roll();
// Add the particle
AddParticle(vPos, vVel, iLifeLeft, AngleToDegrees(rRotation), -1, iTick);
}
}
void CParticleArray::CreateLinearParticles (const CParticleSystemDesc &Desc, CSpaceObject *pObj, int iCount, const CVector &vSource, const CVector &vSourceVel, int iDirection, int iTick)
// CreateLinearParticles
//
// Creates new particles on a straight line
{
int i;
ASSERT(iDirection != -1);
// Compute some basic stuff
const Metric rJitterFactor = LIGHT_SPEED / 100000.0;
Metric rCurRotation = mathDegreesToRadians(180 + Desc.GetXformRotation() + iDirection);
// Compute the spread angle, in radians
Metric rSpread = mathDegreesToRadians(Max(0, Desc.GetSpreadAngle().Roll()));
Metric rHalfSpread = 0.5 * rSpread;
// Calculate where last tick's particles would be based on the last rotation.
Metric rAveSpeed = Desc.GetEmitSpeed().GetAveValue() * LIGHT_SPEED / 100.0;
CVector vCurStart = (GetLastEmitPos() + (Desc.GetXformTime() * ::PolarToVectorRadians(rCurRotation, rAveSpeed * g_SecondsPerUpdate))) - vSource;
// 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 = vSource + rSlide * vCurStart;
// Generate a random velocity backwards
Metric rRotation = rCurRotation + (rHalfSpread * mathRandom(-1000, 1000) / 1000.0);
Metric rSpeed = Desc.GetEmitSpeed().Roll() * LIGHT_SPEED / 100.0;
CVector vVel = Desc.GetXformTime() * (vSourceVel + ::PolarToVectorRadians(rRotation, rSpeed + rJitterFactor * mathRandom(-500, 500)));
// Lifetime
int iLifeLeft = Desc.GetParticleLifetime().Roll();
// Add the particle
AddParticle(vPos, vVel, iLifeLeft, AngleToDegrees(rRotation), -1, iTick);
}
}
void CParticleArray::Emit (const CParticleSystemDesc &Desc, CSpaceObject *pObj, const CVector &vSource, const CVector &vSourceVel, int iDirection, int iTick, int *retiEmitted)
// Emit
//
// Emit particles based on the descriptor.
//
// vSource is relative to the particle array origin.
//
// vSourceVel is the velocity of the source relative to the array origin.
// For some effects, in which the array origin moves with the effect, this
// should be Null. But for particle damage, which has a fixed array origin,
// this should be the motion of the ship/station that fired.
{
// Do we emit this tick?
if (Desc.GetEmitChance() < 100
&& mathRandom(1, 100) > Desc.GetEmitChance())
return;
// Figure out how many particles to emit
int iCount = Desc.GetEmitRate().Roll();
if (iCount <= 0)
return;
// Initialize the particle array, if necessary.
if (GetCount() == 0)
{
// Compute the maximum number of particles that we could ever have
int iNewParticleRate = Desc.GetEmitRate().GetMaxValue();
int iParticleLifetime = Desc.GetParticleLifetime().GetMaxValue();
int iMaxParticleCount = Max(0, iParticleLifetime * iNewParticleRate);
// Initialize the array
Init(iMaxParticleCount, vSource);
}
// The last source position is not always the same as the input source
// position. Depending on the style, we might store something different.
CVector vLastSource = vSource;
// Emit particles
switch (Desc.GetStyle())
{
case CParticleSystemDesc::styleAmorphous:
EmitAmorphous(Desc, iCount, vSource, vSourceVel, iDirection, iTick);
break;
case CParticleSystemDesc::styleBrownian:
EmitCloud(Desc, iCount, vSource, vSourceVel, iDirection, iTick);
break;
case CParticleSystemDesc::styleComet:
EmitComet(Desc, iCount, vSource, vSourceVel, iDirection, iTick);
break;
case CParticleSystemDesc::styleExhaust:
EmitExhaust(Desc, pObj, iCount, vSource, vSourceVel, iDirection, iTick, &vLastSource);
break;
case CParticleSystemDesc::styleJet:
if (Desc.IsFixedPos())
EmitExhaust(Desc, pObj, iCount, vSource, vSourceVel, iDirection, iTick, &vLastSource);
else
EmitJet(Desc, pObj, iCount, vSource, vSourceVel, iDirection, iTick);
break;
case CParticleSystemDesc::styleRadiate:
case CParticleSystemDesc::styleWrithe:
if (Desc.GetSpreadAngle().IsEmpty())
EmitRadiate(Desc, iCount, vSource, vSourceVel, iDirection, iTick);
else
EmitRadiateArc(Desc, iCount, vSource, vSourceVel, iDirection, iTick);
break;
case CParticleSystemDesc::styleSpray:
EmitSpray(Desc, iCount, vSource, vSourceVel, iDirection, iTick);
break;
}
// Remember
m_vLastEmitSource = vLastSource;
m_vLastEmitSourceVel = vSourceVel;
m_iLastEmitDirection = iDirection;
// Done
if (retiEmitted)
*retiEmitted = iCount;
}
void CParticleArray::EmitAmorphous (const CParticleSystemDesc &Desc, int iCount, const CVector &vSource, const CVector &vSourceVel, int iDirection, int iTick)
// EmitAmorphous
//
// Emits a directional stream of particles with a random shape. The head
// of the particles will travel at maximum speed, while the tail will travel at
// minimum speed.
{
const Metric GAUSSIAN_SCALE = 0.5;
int i;
// Compute some basic stuff
Metric rCurRotation = mathDegreesToRadians(Desc.GetXformRotation() + iDirection);
// Compute the range in speed
Metric rMaxSpeed = Desc.GetEmitSpeed().GetMaxValue() * LIGHT_SPEED / 100.0;
Metric rMinSpeed = Desc.GetEmitSpeed().GetMinValue() * LIGHT_SPEED / 100.0;
Metric rSpeedRange = Max(0.01 * LIGHT_SPEED, rMaxSpeed - rMinSpeed);
// Compute the spread angle, in radians
Metric rSpread = mathDegreesToRadians(Max(0, Desc.GetSpreadAngle().Roll()));
Metric rHalfSpread = 0.5 * rSpread;
// If the emissions come from a line, calculate that (emitWidth)
Metric rSpreadRange = Desc.GetEmitWidth().Roll() * g_KlicksPerPixel;
CVector vTangent = ::PolarToVectorRadians(rCurRotation + (0.5 * PI), rSpreadRange);
// Create the particles
for (i = 0; i < iCount; i++)
{
// Pick the position of the particle along the main axis, with a
// concentration towards the head.
Metric rLengthPos = GAUSSIAN_SCALE * Absolute(::mathRandomGaussian());
Metric rSpeed = Max(0.01 * LIGHT_SPEED, rMaxSpeed - (rSpeedRange * rLengthPos));
// Pick a position along the width axis. Again, we concentrate on the
// center.
Metric rWidthPos = GAUSSIAN_SCALE * ::mathRandomGaussian();
Metric rRotation = rCurRotation + (rHalfSpread * rWidthPos);
// All particle start near the emission point
CVector vPos = vSource;
CVector vVel = vSourceVel + ::PolarToVectorRadians(rRotation, rSpeed);
// Adjust for spread
if (rSpreadRange > 0.0)
{
Metric rTangentPlace = ((mathRandom(0, 25) + mathRandom(0, 25) + mathRandom(0, 25) + mathRandom(0, 25)) - 50.0) / 100.0;
vPos = vPos + (vTangent * rTangentPlace);
}
// Add the particle
AddParticle(vPos, vVel, Desc.GetParticleLifetime().Roll(), AngleToDegrees(rRotation), -1, iTick);
}
}
void CParticleArray::EmitCloud (const CParticleSystemDesc &Desc, int iCount, const CVector &vSource, const CVector &vSourceVel, int iDirection, int iTick)
// EmitCloud
//
// Creates randomly in a circle (of a given radius) and with random velocity.
{
int i;
// Compute some basic stuff
const Metric rJitterFactor = LIGHT_SPEED / 100000.0;
int iRadius = Desc.GetRadius().Roll();
// Create particles
for (i = 0; i < iCount; i++)
{
// Choose a position
CVector vPos = vSource + ::PolarToVector(mathRandom(0, 359), mathRandom(0, iRadius) * g_KlicksPerPixel);
// Choose a random angle and velocity
Metric rAngle = 2.0 * PI * (mathRandom(0, 9999) / 10000.0);
Metric rSpeed = (Desc.GetEmitSpeed().Roll() * LIGHT_SPEED / 100.0) + rJitterFactor * mathRandom(-500, 500);
CVector vVel = Desc.GetXformTime() * (vSourceVel + ::PolarToVectorRadians(rAngle, rSpeed));
// Lifetime
int iLifeLeft = Desc.GetParticleLifetime().Roll();
// Add the particle
AddParticle(vPos, vVel, iLifeLeft, AngleToDegrees(rAngle), -1, iTick);
}
}
void CParticleArray::EmitComet (const CParticleSystemDesc &Desc, int iCount, const CVector &vSource, const CVector &vSourceVel, int iDirection, int iTick)
// EmitComet
//
// Emits a directional stream of particles in the shape of a comet. The head
// of the comet will travel at maximum speed, while the tail will travel at
// minimum speed.
{
const TArray<CVector> &SplinePoints = CParticlePatternEffectCreator::GetSplinePoints();
const int SPLINE_CHOOSE_POINTS = 1000;
int i;
// Compute some basic stuff
int iCurRotation = Desc.GetXformRotation() + iDirection;
Metric rCurRotation = mathDegreesToRadians(iCurRotation);
// Compute the range in speed
Metric rMaxSpeed = Desc.GetEmitSpeed().GetMaxValue() * LIGHT_SPEED / 100.0;
Metric rMinSpeed = Desc.GetEmitSpeed().GetMinValue() * LIGHT_SPEED / 100.0;
Metric rSpeedRange = Max(0.01 * LIGHT_SPEED, rMaxSpeed - rMinSpeed);
// Compute the size of the comet (at the time we emit)
Metric rLength = g_SecondsPerUpdate * Desc.GetEmitSpeed().GetAveValueFloat() * LIGHT_SPEED / 100.0;
Metric rWidth = Max(0.5 * rLength, Desc.GetEmitWidth().GetMaxValue() * g_KlicksPerPixel);
// Use a stepper to cluster the points towards the head.
CStepIncrementor SplinePos(CStepIncrementor::styleSquare, 0.0, SplinePoints.GetCount() - 1, SPLINE_CHOOSE_POINTS);
CStepIncrementor WidthPos(CStepIncrementor::styleLinear, -1.0, 1.0, SPLINE_CHOOSE_POINTS);
// Create the particles
for (i = 0; i < iCount; i++)
{
// Pick a random position on the comet line
const CVector &vSplinePos = SplinePoints[(int)SplinePos.GetAt(mathRandom(0, SPLINE_CHOOSE_POINTS))];
// Pick a random position on the width and adjust the spline
Metric rWidthAdj = WidthPos.GetAt(mathRandom(0, SPLINE_CHOOSE_POINTS));
CVector vSplineAdj(vSplinePos.GetX() * rLength, vSplinePos.GetY() * rWidthAdj * rWidth);
// Rotate the spline
CVector vSplinePosRot = vSplineAdj.Rotate(iCurRotation + 180);
CVector vPos = vSource + vSplinePosRot;
// Pick a velocity, proportional to the place on the spline
Metric rVelAdj = vSplinePos.GetX();
CVector vVel = vSourceVel + ::PolarToVectorRadians(rCurRotation, rMaxSpeed - (rSpeedRange * rVelAdj));
// Add the particle
AddParticle(vPos, vVel, Desc.GetParticleLifetime().Roll(), iCurRotation, -1, iTick, rVelAdj);
}
}
void CParticleArray::EmitExhaust (const CParticleSystemDesc &Desc, CSpaceObject *pObj, int iCount, const CVector &vSource, const CVector &vSourceVel, int iDirection, int iTick, CVector *retvLastSource)
// EmitExhaust
//
// Emits 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());
// No matter what we initialize the last source position, so we're ready.
if (retvLastSource)
*retvLastSource = vCurPos + vSource;
// If we haven't yet figured out which direction to emit, then we wait.
// (This doesn't happen until paint time).
if (iDirection == -1)
return;
// Calc positions
CVector vToOldPos;
if (Desc.IsTrackingObject())
{
Metric rAveSpeed = Desc.GetXformTime() * Desc.GetEmitSpeed().GetAveValue() * LIGHT_SPEED / 100.0;
vToOldPos = GetLastEmitPos() - (vCurPos + vSource) + ::PolarToVector(180 + GetLastEmitDirection(), rAveSpeed * g_SecondsPerUpdate);
}
else
{
Metric rSpeed = (pObj ? pObj->GetVel().Length() : 0.0);
vToOldPos = ::PolarToVector(180 + GetLastEmitDirection(), rSpeed * g_SecondsPerUpdate);
}
// Compute two orthogonal coordinates
CVector vAxis = ::PolarToVector(iDirection + 180, 1.0);
CVector vTangent = ::PolarToVector(iDirection + 90, 1.0);
// Width of emission
Metric rHalfWidth = 0.5 * Desc.GetEmitWidth().Roll() * g_KlicksPerPixel;
// Create particles
for (i = 0; i < iCount; i++)
{
Metric rSlide = mathRandom(0, 9999) / 10000.0;
Metric rTangentSlide = mathRandom(-9999, 9999) / 10000.0;
// Compute a position randomly along the line between the current and
// last emit positions.
CVector vPos = vSource + rSlide * vToOldPos;
// If we have an emit width, adjust position
if (rHalfWidth > 0.0)
vPos = vPos + (vTangent * (rTangentSlide * rHalfWidth));
// Generate a random velocity along the tangent
Metric rAxisJitter = mathRandom(-50, 50) / 100.0;
CVector vVel = (vTangent * rTangentSlide * Desc.GetXformTime() * Desc.GetTangentSpeed().Roll() * LIGHT_SPEED / 100.0)
+ (vAxis * (Desc.GetEmitSpeed().Roll() + rAxisJitter) * LIGHT_SPEED / 100.0);
// Lifetime
int iLifeLeft = Desc.GetParticleLifetime().Roll();
// Add the particle
AddParticle(vPos, vVel, iLifeLeft, iDirection, -1, iTick);
}
}
void CParticleArray::EmitJet (const CParticleSystemDesc &Desc, CSpaceObject *pObj, int iCount, const CVector &vSource, const CVector &vSourceVel, int iDirection, int iTick)
// EmitJet
//
// Emits a jet of particles
{
// If we haven't yet figured out which direction to emit, then we wait.
// (This doesn't happen until paint time).
if (iDirection == -1)
return;
// If our emit direction has changed then we need to interpolate between the two
if (iDirection != GetLastEmitDirection())
CreateInterpolatedParticles(Desc, pObj, iCount, vSource, vSourceVel, iDirection, iTick);
// Otherwise, just linear creation
else
CreateLinearParticles(Desc, pObj, iCount, vSource, vSourceVel, iDirection, iTick);
}
void CParticleArray::EmitRadiate (const CParticleSystemDesc &Desc, int iCount, const CVector &vSource, const CVector &vSourceVel, int iDirection, int iTick)
// EmitRadiate
//
// Emits in a circular shell.
{
int i;
// Compute some basic stuff
const Metric rJitterFactor = LIGHT_SPEED / 100000.0;
// Calculate where last tick's particles would be based on the last rotation.
Metric rAveSpeed = Desc.GetEmitSpeed().GetAveValue() * LIGHT_SPEED / 100.0;
// Create particles
for (i = 0; i < iCount; i++)
{
// Choose a random angle and velocity
Metric rAngle = 2.0 * PI * (mathRandom(0, 9999) / 10000.0);
Metric rSpeed = (Desc.GetEmitSpeed().Roll() * LIGHT_SPEED / 100.0) + rJitterFactor * mathRandom(-500, 500);
CVector vVel = Desc.GetXformTime() * (vSourceVel + ::PolarToVectorRadians(rAngle, rSpeed));
// Lifetime
int iLifeLeft = Desc.GetParticleLifetime().Roll();
// Add the particle
AddParticle(vSource, vVel, iLifeLeft, AngleToDegrees(rAngle), -1, iTick);
}
}
void CParticleArray::EmitRadiateArc (const CParticleSystemDesc &Desc, int iCount, const CVector &vSource, const CVector &vSourceVel, int iDirection, int iTick)
// EmitRadiateArc
//
// Emits in a circular arc centered on iDirection.
{
// Calculate the size of the arc (in degrees)
int iArcAngle = Desc.GetSpreadAngle().Roll();
if (iArcAngle <= 0)
return;
else if (iArcAngle >= 360)
return EmitRadiate(Desc, iCount, vSource, vSourceVel, iDirection, iTick);
Metric rMinAngle = mathDegreesToRadians(AngleMod(iDirection - (iArcAngle / 2)));
Metric rRange = mathDegreesToRadians(iArcAngle);
// Compute some basic stuff
const Metric rJitterFactor = LIGHT_SPEED / 100000.0;
// Calculate where last tick's particles would be based on the last rotation.
Metric rAveSpeed = Desc.GetEmitSpeed().GetAveValue() * LIGHT_SPEED / 100.0;
// Create particles
for (int i = 0; i < iCount; i++)
{
// Choose a random angle within the arc (no need for mod since we're
// about to convert to Cartessian below).
Metric rAngle = rMinAngle + (mathRandomDouble() * rRange);
// Choose a random velocity
Metric rSpeed = (Desc.GetEmitSpeed().Roll() * LIGHT_SPEED / 100.0) + rJitterFactor * mathRandom(-500, 500);
CVector vVel = Desc.GetXformTime() * (vSourceVel + ::PolarToVectorRadians(rAngle, rSpeed));
// Lifetime
int iLifeLeft = Desc.GetParticleLifetime().Roll();
// Add the particle
AddParticle(vSource, vVel, iLifeLeft, AngleToDegrees(rAngle), -1, iTick);
}
}
void CParticleArray::EmitSpray (const CParticleSystemDesc &Desc, int iCount, const CVector &vSource, const CVector &vSourceVel, int iDirection, int iTick)
// EmitSpray
//
// Emits a directional spray (compatible with particle weapon effects).
{
int i;
// Calculate a few temporaries
Metric rRatedSpeed = Desc.GetEmitSpeed().GetAveValueFloat() * LIGHT_SPEED / 100.0;
Metric rRadius = (6.0 * rRatedSpeed);
int iSpreadAngle = Desc.GetSpreadAngle().Roll();
if (iSpreadAngle > 0)
iSpreadAngle = (iSpreadAngle / 2) + 1;
bool bSpreadAngle = (iSpreadAngle > 0);
CVector vTemp = PolarToVector(iSpreadAngle, rRatedSpeed);
Metric rTangentV = (3.0 * vTemp.GetY());
int iTangentAngle = (iDirection + 90) % 360;
int iSpreadWidth = Desc.GetEmitWidth().Roll();
Metric rSpreadWidth = iSpreadWidth * g_KlicksPerPixel;
bool bSpreadWidth = (iSpreadWidth > 0);
// Create the particles with appropriate velocity
for (i = 0; i < iCount; i++)
{
Metric rPlace = ((mathRandom(0, 25) + mathRandom(0, 25) + mathRandom(0, 25) + mathRandom(0, 25)) - 50.0) / 100.0;
Metric rTangentPlace = ((mathRandom(0, 25) + mathRandom(0, 25) + mathRandom(0, 25) + mathRandom(0, 25)) - 50.0) / 100.0;
CVector vPlace = PolarToVector(iDirection, rRadius * rPlace);
CVector vVel = PolarToVector(iDirection, rRatedSpeed)
+ (0.05 * vPlace)
+ PolarToVector(iTangentAngle, rTangentV * rTangentPlace);
// Compute the spread width
CVector vPos = vSource + vPlace;
if (bSpreadWidth)
vPos = vPos + PolarToVector(iTangentAngle, rSpreadWidth * rTangentPlace);
// Compute the travel rotation for these particles
int iRotation = (bSpreadAngle ? VectorToPolar(vVel) : iDirection);
// Create the particle
AddParticle(vPos, vSourceVel + vVel, Desc.GetParticleLifetime().Roll(), iRotation, -1, iTick);
}
}
void CParticleArray::GetBounds (CVector *retvUR, CVector *retvLL)
// GetBounds
//
// Returns the bounds of the particles
{
if (m_bUseRealCoords)
{
*retvUR = m_vOrigin + m_vUR;
*retvLL = m_vOrigin + m_vLL;
}
else
{
*retvUR = m_vOrigin + CVector(m_rcBounds.right * g_KlicksPerPixel, -m_rcBounds.top * g_KlicksPerPixel);
*retvLL = m_vOrigin + CVector(m_rcBounds.left * g_KlicksPerPixel, -m_rcBounds.bottom * g_KlicksPerPixel);
}
}
void CParticleArray::Init (int iMaxCount, const CVector &vOrigin)
// Init
//
// Initializes the particle array
{
CleanUp();
if (iMaxCount > 0)
{
m_pArray = new SParticle [iMaxCount];
utlMemSet(m_pArray, sizeof(SParticle) * iMaxCount, 0);
m_iCount = iMaxCount;
}
m_vOrigin = vOrigin;
}
void CParticleArray::Move (const CVector &vMove)
// Move
//
// Moves all particles by the given vector
{
UseRealCoords();
SParticle *pParticle = m_pArray;
SParticle *pEnd = pParticle + m_iCount;
int iParticleCount = 0;
CVector vTotalPos;
// Keep track of bounds
Metric xLeft = g_InfiniteDistance;
Metric xRight = -g_InfiniteDistance;
Metric yTop = -g_InfiniteDistance;
Metric yBottom = g_InfiniteDistance;
// Loop
while (pParticle < pEnd)
{
if (pParticle->fAlive)
{
iParticleCount++;
// Update position
pParticle->Pos = pParticle->Pos + vMove;
// Convert to integer
// NOTE: If we're using real coords we always ignore integer
// velocity.
PosToXY(pParticle->Pos, &pParticle->x, &pParticle->y);
// Update the bounding box
if (pParticle->Pos.GetX() > xRight)
xRight = pParticle->Pos.GetX();
if (pParticle->Pos.GetX() < xLeft)
xLeft = pParticle->Pos.GetX();
if (pParticle->Pos.GetY() < yBottom)
yBottom = pParticle->Pos.GetY();
if (pParticle->Pos.GetY() > yTop)
yTop = pParticle->Pos.GetY();
// Update center of mass
vTotalPos = vTotalPos + pParticle->Pos;
}
// Next
pParticle++;
}
// Set bounds
m_vUR = CVector(xRight, yTop);
m_vLL = CVector(xLeft, yBottom);
int xiRight, xiLeft, yiTop, yiBottom;
PosToXY(m_vUR, &xiRight, &yiTop);
PosToXY(m_vLL, &xiLeft, &yiBottom);
m_rcBounds.left = xiLeft / FIXED_POINT;
m_rcBounds.top = yiTop / FIXED_POINT;
m_rcBounds.right = xiRight / FIXED_POINT;
m_rcBounds.bottom = yiBottom / FIXED_POINT;
// Center of mass
m_vCenterOfMass = (iParticleCount > 0 ? vTotalPos / (Metric)iParticleCount : NullVector);
}
void CParticleArray::Paint (const CParticleSystemDesc &Desc, CG32bitImage &Dest, int xPos, int yPos, IEffectPainter *pPainter, SViewportPaintCtx &Ctx)
// Paint
//
// Paint all particles
{
if (pPainter == NULL)
return;
// See if the painter has a paint descriptor (which is faster for us).
SParticlePaintDesc PaintDesc;
if (pPainter->GetParticlePaintDesc(&PaintDesc))
{
PaintDesc.iMaxLifetime = Desc.GetParticleLifetime().GetMaxValue();
Paint(Dest, xPos, yPos, Ctx, PaintDesc);
}
// Otherwise, we use the painter for each particle
else
Paint(Dest, xPos, yPos, Ctx, pPainter, Desc.GetEmitSpeed().GetAveValueFloat() * LIGHT_SECOND / 100.0);
#ifdef DEBUG_PARTICLE_BOUNDS
CVector vUR;
CVector vLL;
GetBounds(&vUR, &vLL);
int xUR, yUR;
Ctx.XForm.Transform(vUR, &xUR, &yUR);
int xLL, yLL;
Ctx.XForm.Transform(vLL, &xLL, &yLL);
Dest.DrawLine(xUR, yUR, xUR, yLL, 1, CG32bitPixel(255, 255, 0));
Dest.DrawLine(xUR, yLL, xLL, yLL, 1, CG32bitPixel(255, 255, 0));
Dest.DrawLine(xLL, yLL, xLL, yUR, 1, CG32bitPixel(255, 255, 0));
Dest.DrawLine(xLL, yUR, xUR, yUR, 1, CG32bitPixel(255, 255, 0));
#endif
}
void CParticleArray::Paint (CG32bitImage &Dest,
int xPos,
int yPos,
SViewportPaintCtx &Ctx,
SParticlePaintDesc &Desc)
// Paint
//
// Paint all particles
{
// Paint based on style
switch (Desc.iStyle)
{
case paintFlame:
{
int iCore = Desc.iMaxLifetime / 6;
int iFlame = Desc.iMaxLifetime / 2;
int iSmoke = 3 * Desc.iMaxLifetime / 4;
int iSmokeBrightness = 80;
PaintFireAndSmoke(Dest,
xPos, yPos,
Ctx,
Desc.iMaxLifetime,
Desc.iMinWidth,
Desc.iMaxWidth,
iCore,
iFlame,
iSmoke,
iSmokeBrightness);
break;
}
case paintGlitter:
{
PaintGlitter(Dest, xPos, yPos, Ctx, Desc.iMaxWidth, Desc.rgbPrimaryColor, Desc.rgbSecondaryColor);
break;
}