122 lines
4.1 KiB
C++
122 lines
4.1 KiB
C++
// Copyright (C) 2002-2008 Nikolaus Gebhardt
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// This file is part of the "Irrlicht Engine".
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// For conditions of distribution and use, see copyright notice in irrlicht.h
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#include "CParticlePointEmitter.h"
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#include "os.h"
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#include "IAttributes.h"
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namespace irr
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{
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namespace scene
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{
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//! constructor
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CParticlePointEmitter::CParticlePointEmitter(
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const core::vector3df& direction, u32 minParticlesPerSecond,
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u32 maxParticlesPerSecond, video::SColor minStartColor,
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video::SColor maxStartColor, u32 lifeTimeMin, u32 lifeTimeMax,
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s32 maxAngleDegrees)
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: Direction(direction), MinParticlesPerSecond(minParticlesPerSecond),
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MaxParticlesPerSecond(maxParticlesPerSecond),
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MinStartColor(minStartColor), MaxStartColor(maxStartColor),
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MinLifeTime(lifeTimeMin), MaxLifeTime(lifeTimeMax),
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MaxAngleDegrees(maxAngleDegrees), Time(0), Emitted(0)
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{
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#ifdef _DEBUG
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setDebugName("CParticlePointEmitter");
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#endif
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}
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//! Prepares an array with new particles to emitt into the system
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//! and returns how much new particles there are.
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s32 CParticlePointEmitter::emitt(u32 now, u32 timeSinceLastCall, SParticle*& outArray)
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{
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Time += timeSinceLastCall;
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u32 pps = (MaxParticlesPerSecond - MinParticlesPerSecond);
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f32 perSecond = pps ? (f32)MinParticlesPerSecond + (os::Randomizer::rand() % pps) : MinParticlesPerSecond;
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f32 everyWhatMillisecond = 1000.0f / perSecond;
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if (Time > everyWhatMillisecond)
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{
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Time = 0;
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Particle.startTime = now;
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Particle.vector = Direction;
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if (MaxAngleDegrees)
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{
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core::vector3df tgt = Direction;
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tgt.rotateXYBy((os::Randomizer::rand()%(MaxAngleDegrees*2)) - MaxAngleDegrees, core::vector3df(0,0,0));
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tgt.rotateYZBy((os::Randomizer::rand()%(MaxAngleDegrees*2)) - MaxAngleDegrees, core::vector3df(0,0,0));
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tgt.rotateXZBy((os::Randomizer::rand()%(MaxAngleDegrees*2)) - MaxAngleDegrees, core::vector3df(0,0,0));
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Particle.vector = tgt;
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}
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if (MaxLifeTime - MinLifeTime == 0)
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Particle.endTime = now + MinLifeTime;
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else
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Particle.endTime = now + MinLifeTime + (os::Randomizer::rand() % (MaxLifeTime - MinLifeTime));
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Particle.color = MinStartColor.getInterpolated(
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MaxStartColor, (os::Randomizer::rand() % 100) / 100.0f);
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Particle.startColor = Particle.color;
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Particle.startVector = Particle.vector;
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outArray = &Particle;
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return 1;
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}
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return 0;
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}
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//! Writes attributes of the object.
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void CParticlePointEmitter::serializeAttributes(io::IAttributes* out, io::SAttributeReadWriteOptions* options) const
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{
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out->addVector3d("Direction", Direction);
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out->addInt("MinParticlesPerSecond", MinParticlesPerSecond);
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out->addInt("MaxParticlesPerSecond", MaxParticlesPerSecond);
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out->addColor("MinStartColor", MinStartColor);
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out->addColor("MaxStartColor", MaxStartColor);
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out->addInt("MinLifeTime", MinLifeTime);
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out->addInt("MaxLifeTime", MaxLifeTime);
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out->addInt("MaxAngleDegrees", MaxAngleDegrees);
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}
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//! Reads attributes of the object.
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s32 CParticlePointEmitter::deserializeAttributes(s32 startIndex, io::IAttributes* in, io::SAttributeReadWriteOptions* options)
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{
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Direction = in->getAttributeAsVector3d("Direction");
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if (Direction.getLength() == 0)
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Direction.set(0,0.01f,0);
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MinParticlesPerSecond = in->getAttributeAsInt("MinParticlesPerSecond");
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MaxParticlesPerSecond = in->getAttributeAsInt("MaxParticlesPerSecond");
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MinParticlesPerSecond = core::max_(1u, MinParticlesPerSecond);
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MaxParticlesPerSecond = core::max_(MaxParticlesPerSecond, 1u);
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MaxParticlesPerSecond = core::min_(MaxParticlesPerSecond, 200u);
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MinParticlesPerSecond = core::min_(MinParticlesPerSecond, MaxParticlesPerSecond);
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MinStartColor = in->getAttributeAsColor("MinStartColor");
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MaxStartColor = in->getAttributeAsColor("MaxStartColor");
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MinLifeTime = in->getAttributeAsInt("MinLifeTime");
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MaxLifeTime = in->getAttributeAsInt("MaxLifeTime");
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MaxAngleDegrees = in->getAttributeAsInt("MaxAngleDegrees");
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MinLifeTime = core::max_(0u, MinLifeTime);
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MaxLifeTime = core::max_(MaxLifeTime, MinLifeTime);
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MinLifeTime = core::min_(MinLifeTime, MaxLifeTime);
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return in->findAttribute("MaxAngleDegrees");
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}
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} // end namespace scene
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} // end namespace irr
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