Avoid warning and make local variable lower-case.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@6000 dfc29bdd-3216-0410-991c-e03cc46cb475

source/Irrlicht/CSceneNodeAnimatorFollowSpline.cpp

@@ -0,0 +1,168 @@
+// Copyright (C) 2002-2012 Nikolaus Gebhardt
+// This file is part of the "Irrlicht Engine".
+// For conditions of distribution and use, see copyright notice in irrlicht.h
+
+#include "CSceneNodeAnimatorFollowSpline.h"
+
+namespace irr
+{
+namespace scene
+{
+
+
+//! constructor
+CSceneNodeAnimatorFollowSpline::CSceneNodeAnimatorFollowSpline(u32 time,
+	const core::array<core::vector3df>& points, f32 speed,
+	f32 tightness, bool loop, bool pingpong)
+: ISceneNodeAnimatorFinishing(0), Points(points), Speed(speed), Tightness(tightness)
+, Loop(loop), PingPong(pingpong)
+{
+	#ifdef _DEBUG
+	setDebugName("CSceneNodeAnimatorFollowSpline");
+	#endif
+
+	StartTime = time;
+}
+
+
+inline s32 CSceneNodeAnimatorFollowSpline::clamp(s32 idx, s32 size)
+{
+	return ( idx<0 ? size+idx : ( idx>=size ? idx-size : idx ) );
+}
+
+
+//! animates a scene node
+void CSceneNodeAnimatorFollowSpline::animateNode(ISceneNode* node, u32 timeMs)
+{
+	if(!node)
+		return;
+
+	const u32 pSize = Points.size();
+	if (pSize==0)
+	{
+		if ( !Loop )
+			HasFinished = true;
+		return;
+	}
+	if (pSize==1)
+	{
+		if ( timeMs > (StartTime+PauseTimeSum) )
+		{
+			node->setPosition(Points[0]);
+			if ( !Loop )
+				HasFinished = true;
+		}
+		return;
+	}
+
+	const f32 dt = ( (timeMs-(StartTime+PauseTimeSum)) * Speed * 0.001f );
+	const s32 unwrappedIdx = core::floor32( dt );
+	if ( !Loop && unwrappedIdx >= (s32)pSize-1 )
+	{
+		node->setPosition(Points[pSize-1]);
+		HasFinished = true;
+		return;
+	}
+	const bool pong = PingPong && (unwrappedIdx/(pSize-1))%2;
+	const f32 u =  pong ? 1.f-core::fract ( dt ) : core::fract ( dt );
+	const s32 idx = pong ?	(pSize-2) - (unwrappedIdx % (pSize-1))
+						: (PingPong ? unwrappedIdx % (pSize-1)
+									: unwrappedIdx % pSize);
+	//const f32 u = 0.001f * fmodf( dt, 1000.0f );
+
+	const core::vector3df& p0 = Points[ clamp( idx - 1, pSize ) ];
+	const core::vector3df& p1 = Points[ clamp( idx + 0, pSize ) ]; // starting point
+	const core::vector3df& p2 = Points[ clamp( idx + 1, pSize ) ]; // end point
+	const core::vector3df& p3 = Points[ clamp( idx + 2, pSize ) ];
+
+	// hermite polynomials
+	const f32 h1 = 2.0f * u * u * u - 3.0f * u * u + 1.0f;
+	const f32 h2 = -2.0f * u * u * u + 3.0f * u * u;
+	const f32 h3 = u * u * u - 2.0f * u * u + u;
+	const f32 h4 = u * u * u - u * u;
+
+	// tangents
+	const core::vector3df t1 = ( p2 - p0 ) * Tightness;
+	const core::vector3df t2 = ( p3 - p1 ) * Tightness;
+
+	// interpolated point
+	node->setPosition(p1 * h1 + p2 * h2 + t1 * h3 + t2 * h4);
+}
+
+
+//! Writes attributes of the scene node animator.
+void CSceneNodeAnimatorFollowSpline::serializeAttributes(io::IAttributes* out, io::SAttributeReadWriteOptions* options) const
+{
+	ISceneNodeAnimatorFinishing::serializeAttributes(out, options);
+
+	out->addFloat("Speed", Speed);
+	out->addFloat("Tightness", Tightness);
+	out->addBool("Loop", Loop);
+	out->addBool("PingPong", PingPong);
+
+	u32 count = Points.size();
+
+	if ( options && (options->Flags & io::EARWF_FOR_EDITOR))
+	{
+		// add one point in addition when serializing for editors
+		// to make it easier to add points quickly
+		count += 1;
+	}
+
+	for (u32 i=0; i<count; ++i)
+	{
+		core::stringc tname = "Point";
+		tname += (int)(i+1);
+
+		out->addVector3d(tname.c_str(), i<Points.size() ? Points[i] : core::vector3df(0,0,0) );
+	}
+}
+
+
+//! Reads attributes of the scene node animator.
+void CSceneNodeAnimatorFollowSpline::deserializeAttributes(io::IAttributes* in, io::SAttributeReadWriteOptions* options)
+{
+	ISceneNodeAnimatorFinishing::deserializeAttributes(in, options);
+
+	Speed = in->getAttributeAsFloat("Speed");
+	Tightness = in->getAttributeAsFloat("Tightness");
+	Loop = in->getAttributeAsBool("Loop");
+	PingPong = in->getAttributeAsBool("PingPong");
+	Points.clear();
+
+	for(u32 i=1; true; ++i)
+	{
+		core::stringc pname = "Point";
+		pname += i;
+
+		if (in->existsAttribute(pname.c_str()))
+			Points.push_back(in->getAttributeAsVector3d(pname.c_str()));
+		else
+			break;
+	}
+
+	// remove last point if double entry from editor
+	if ( options && (options->Flags & io::EARWF_FOR_EDITOR) &&
+		Points.size() > 2 && Points.getLast() == core::vector3df(0,0,0))
+	{
+		Points.erase(Points.size()-1);
+
+		if (Points.size() > 2 && Points.getLast() == core::vector3df(0,0,0))
+			Points.erase(Points.size()-1);
+	}
+}
+
+
+ISceneNodeAnimator* CSceneNodeAnimatorFollowSpline::createClone(ISceneNode* node, ISceneManager* newManager)
+{
+	CSceneNodeAnimatorFollowSpline * newAnimator =
+		new CSceneNodeAnimatorFollowSpline(StartTime, Points, Speed, Tightness);
+	newAnimator->cloneMembers(this);
+
+	return newAnimator;
+}
+
+
+} // end namespace scene
+} // end namespace irr
+