100 lines
3.0 KiB
C++
100 lines
3.0 KiB
C++
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// Copyright (C) 2002-2007 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 "CParticleRingEmitter.h"
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#include "os.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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CParticleRingEmitter::CParticleRingEmitter(
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const core::vector3df& center, f32 radius, f32 ringThickness,
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const core::vector3df& direction, u32 minParticlesPerSecond,
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u32 maxParticlesPerSecond, const video::SColor& minStartColor,
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const video::SColor& maxStartColor, u32 lifeTimeMin, u32 lifeTimeMax,
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s32 maxAngleDegrees)
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: Center(center), Radius(radius), RingThickness(ringThickness),
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Direction(direction), MinParticlesPerSecond(minParticlesPerSecond),
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MaxParticlesPerSecond(maxParticlesPerSecond), MinStartColor(minStartColor),
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MaxStartColor(maxStartColor), MinLifeTime(lifeTimeMin), MaxLifeTime(lifeTimeMax),
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Time(0), Emitted(0), MaxAngleDegrees(maxAngleDegrees)
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{
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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 CParticleRingEmitter::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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Particles.set_used(0);
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u32 amount = (u32)((Time / everyWhatMillisecond) + 0.5f);
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Time = 0;
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SParticle p;
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if(amount > MaxParticlesPerSecond*2)
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amount = MaxParticlesPerSecond * 2;
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for(u32 i=0; i<amount; ++i)
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{
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f32 distance = fmodf( (f32)os::Randomizer::rand(), RingThickness * 0.5f * 1000.0f ) * 0.001f;
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s32 plusMinus = os::Randomizer::rand() % 2;
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if( plusMinus )
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distance *= -1.0f;
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distance += Radius;
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p.pos.X = Center.X + distance;
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p.pos.Y = Center.Y;
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p.pos.Z = Center.Z + distance;
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p.pos.rotateXZBy( ( os::Randomizer::rand() % 3600 ) * 0.1f, Center );
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p.startTime = now;
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p.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, Center );
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tgt.rotateYZBy((os::Randomizer::rand()%(MaxAngleDegrees*2)) - MaxAngleDegrees, Center );
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tgt.rotateXZBy((os::Randomizer::rand()%(MaxAngleDegrees*2)) - MaxAngleDegrees, Center );
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p.vector = tgt;
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}
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if(MaxLifeTime - MinLifeTime == 0)
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p.endTime = now + MinLifeTime;
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else
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p.endTime = now + MinLifeTime + (os::Randomizer::rand() % (MaxLifeTime - MinLifeTime));
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p.color = MinStartColor.getInterpolated(
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MaxStartColor, (os::Randomizer::rand() % 100) / 100.0f);
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p.startColor = p.color;
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p.startVector = p.vector;
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Particles.push_back(p);
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}
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outArray = Particles.pointer();
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return Particles.size();
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}
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return 0;
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}
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} // end namespace scene
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} // end namespace irr
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