irrlicht/source/Irrlicht/CParticleRingEmitter.cpp

100 lines
3.0 KiB
C++

// Copyright (C) 2002-2007 Nikolaus Gebhardt
// This file is part of the "Irrlicht Engine".
// For conditions of distribution and use, see copyright notice in irrlicht.h
#include "CParticleRingEmitter.h"
#include "os.h"
namespace irr
{
namespace scene
{
//! constructor
CParticleRingEmitter::CParticleRingEmitter(
const core::vector3df& center, f32 radius, f32 ringThickness,
const core::vector3df& direction, u32 minParticlesPerSecond,
u32 maxParticlesPerSecond, const video::SColor& minStartColor,
const video::SColor& maxStartColor, u32 lifeTimeMin, u32 lifeTimeMax,
s32 maxAngleDegrees)
: Center(center), Radius(radius), RingThickness(ringThickness),
Direction(direction), MinParticlesPerSecond(minParticlesPerSecond),
MaxParticlesPerSecond(maxParticlesPerSecond), MinStartColor(minStartColor),
MaxStartColor(maxStartColor), MinLifeTime(lifeTimeMin), MaxLifeTime(lifeTimeMax),
Time(0), Emitted(0), MaxAngleDegrees(maxAngleDegrees)
{
}
//! Prepares an array with new particles to emitt into the system
//! and returns how much new particles there are.
s32 CParticleRingEmitter::emitt(u32 now, u32 timeSinceLastCall, SParticle*& outArray)
{
Time += timeSinceLastCall;
u32 pps = (MaxParticlesPerSecond - MinParticlesPerSecond);
f32 perSecond = pps ? (f32)MinParticlesPerSecond + (os::Randomizer::rand() % pps) : MinParticlesPerSecond;
f32 everyWhatMillisecond = 1000.0f / perSecond;
if(Time > everyWhatMillisecond)
{
Particles.set_used(0);
u32 amount = (u32)((Time / everyWhatMillisecond) + 0.5f);
Time = 0;
SParticle p;
if(amount > MaxParticlesPerSecond*2)
amount = MaxParticlesPerSecond * 2;
for(u32 i=0; i<amount; ++i)
{
f32 distance = fmodf( (f32)os::Randomizer::rand(), RingThickness * 0.5f * 1000.0f ) * 0.001f;
s32 plusMinus = os::Randomizer::rand() % 2;
if( plusMinus )
distance *= -1.0f;
distance += Radius;
p.pos.X = Center.X + distance;
p.pos.Y = Center.Y;
p.pos.Z = Center.Z + distance;
p.pos.rotateXZBy( ( os::Randomizer::rand() % 3600 ) * 0.1f, Center );
p.startTime = now;
p.vector = Direction;
if(MaxAngleDegrees)
{
core::vector3df tgt = Direction;
tgt.rotateXYBy((os::Randomizer::rand()%(MaxAngleDegrees*2)) - MaxAngleDegrees, Center );
tgt.rotateYZBy((os::Randomizer::rand()%(MaxAngleDegrees*2)) - MaxAngleDegrees, Center );
tgt.rotateXZBy((os::Randomizer::rand()%(MaxAngleDegrees*2)) - MaxAngleDegrees, Center );
p.vector = tgt;
}
if(MaxLifeTime - MinLifeTime == 0)
p.endTime = now + MinLifeTime;
else
p.endTime = now + MinLifeTime + (os::Randomizer::rand() % (MaxLifeTime - MinLifeTime));
p.color = MinStartColor.getInterpolated(
MaxStartColor, (os::Randomizer::rand() % 100) / 100.0f);
p.startColor = p.color;
p.startVector = p.vector;
Particles.push_back(p);
}
outArray = Particles.pointer();
return Particles.size();
}
return 0;
}
} // end namespace scene
} // end namespace irr