76 lines
2.6 KiB
C++
76 lines
2.6 KiB
C++
#ifndef __SG_INTERPOLATOR_HXX
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#define __SG_INTERPOLATOR_HXX
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// SGInterpolator
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// Subsystem that manages smooth linear interpolation of property
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// values across multiple data points and arbitrary time intervals.
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// Written by Andrew J. Ross, started December 2003
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//
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// Copyright (C) 2003 Andrew J. Ross - andy@plausible.org
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Library General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library 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 GNU
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// Library General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#include <simgear/props/props.hxx>
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#include <simgear/structure/subsystem_mgr.hxx>
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// TODO: support a callback upon interpolation completion so that user
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// code can register another one immediately without worrying about
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// timer aliasing.
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class SGInterpolator : public SGSubsystem
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{
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public:
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SGInterpolator() { _list = 0; }
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// Subsystem API.
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void update(double delta_time_sec) override;
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// Subsystem identification.
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static const char* staticSubsystemClassId() { return "interpolator"; }
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// Simple method that interpolates a double property value from
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// its current value (default of zero) to the specified target
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// over the specified time.
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void interpolate(SGPropertyNode* prop, double value, double dt_sec);
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// More elaborate version that takes a pointer to lists of
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// arbitrary size.
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void interpolate(SGPropertyNode* prop, int nPoints,
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double* values, double* deltas);
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// Cancels any interpolation of the specified property, leaving
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// its value at the current (mid-interpolation) state.
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void cancel(SGPropertyNode* prop);
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private:
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struct Interp {
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SGPropertyNode_ptr target;
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int nPoints;
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double* curve; // time0, val0, time1, val1, ...
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Interp* next;
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~Interp() { delete[] curve; }
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double& dt(int i) { return curve[2*i]; }
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double& val(int i) { return curve[2*i + 1]; }
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};
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Interp* _list;
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bool interp(Interp* rec, double dt);
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void addNew(SGPropertyNode* prop, int nPoints);
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};
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#endif // __SG_INTERPOLATOR_HXX
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