76 lines
1.8 KiB
C++
76 lines
1.8 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 "CParticleGravityAffector.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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CParticleGravityAffector::CParticleGravityAffector(
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const core::vector3df& gravity, u32 timeForceLost)
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: IParticleAffector(), TimeForceLost((f32)timeForceLost), Gravity(gravity)
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{
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}
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//! Affects an array of particles.
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void CParticleGravityAffector::affect(u32 now, SParticle* particlearray, u32 count)
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{
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if (!Enabled)
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return;
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f32 d;
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for (u32 i=0; i<count; ++i)
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{
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d = (now - particlearray[i].startTime) / TimeForceLost;
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if (d > 1.0f)
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d = 1.0f;
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if (d < 0.0f)
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d = 0.0f;
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d = 1.0f - d;
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particlearray[i].vector = particlearray[i].startVector.getInterpolated(Gravity, d);
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}
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}
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//! Writes attributes of the object.
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void CParticleGravityAffector::serializeAttributes(io::IAttributes* out, io::SAttributeReadWriteOptions* options)
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{
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out->addVector3d("Gravity", Gravity);
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out->addFloat("TimeForceLost", TimeForceLost);
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}
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//! Reads attributes of the object.
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s32 CParticleGravityAffector::deserializeAttributes(s32 startIndex, io::IAttributes* in, io::SAttributeReadWriteOptions* options)
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{
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const char* name = in->getAttributeName(startIndex);
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if (!name || strcmp(name, "Gravity"))
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return startIndex; // attribute not valid
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Gravity = in->getAttributeAsVector3d(startIndex);
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++startIndex;
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name = in->getAttributeName(startIndex);
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if (!name || strcmp(name, "TimeForceLost"))
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return startIndex; // attribute not valid
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TimeForceLost = in->getAttributeAsFloat(startIndex);
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++startIndex;
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return startIndex;
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}
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} // end namespace scene
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} // end namespace irr
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