79 lines
2.5 KiB
C++
79 lines
2.5 KiB
C++
// NeL - MMORPG Framework <http://dev.ryzom.com/projects/nel/>
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// Copyright (C) 2010 Winch Gate Property Limited
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as
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// published by the Free Software Foundation, either version 3 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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#ifndef NL_MOUSE_SMOOTHER_H
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#define NL_MOUSE_SMOOTHER_H
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#include "types_nl.h"
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#include "vector_2f.h"
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namespace NLMISC
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{
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/**
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* This smooth position of mouse using cubic splines.
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* The mouse is sampled at the given period. The higher the period, the smoother the movement.
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* However there is a delay of 2 * samplingPeriod between the user moving the mouse and the pointer reaching
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* the wanted position.
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*
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* \author Nicolas Vizerie
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* \author Nevrax France
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* \date 1/2004
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*/
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class CMouseSmoother
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{
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public:
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// create a mouse smoother with the given sampling period.
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CMouseSmoother(double samplingPeriod = 0.2);
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/** Change the sampling period. The longer it lasts, the more smooth the movement.
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* NB : this reset the smoother
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*/
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void setSamplingPeriod(double period);
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// Get the sampling period
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double getSamplingPeriod() const { return _SamplingPeriod; }
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// Reset smoother. The next returned position will be the exact position of mouse (no smoothing with previous position is done)
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void reset();
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// \return trueif no sampling has occured since last resetor construction
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bool isReseted() const { return !_Init; }
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// Sample pos, and return smoothed position
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CVector2f samplePos(const CVector2f &wantedPos, double date);
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private:
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// sample of mouse position
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class CSample
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{
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public:
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double Date;
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CVector2f Pos;
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public:
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// default ctor
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CSample() {}
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// ctor with pos & date
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CSample(double date, const NLMISC::CVector2f &pos) : Date(date), Pos(pos)
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{
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}
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};
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double _SamplingPeriod;
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bool _Init;
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/** 4 samples are needed to compute smoothed position :
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* Sample 0 & 2 are used to compute tangent at sample 1
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* Sample 1 & 3 are used to compute tangent at sample 2
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*/
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CSample _Sample[4];
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};
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} // NLMISC
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#endif
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