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119 lines
2.7 KiB
C++
119 lines
2.7 KiB
C++
//
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// FILE: FastMap.cpp
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// AUTHOR: Rob Tillaart
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// VERSION: 0.3.3
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// PURPOSE: class with fast map function - library for Arduino
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// URL: https://github.com/RobTillaart/FastMap
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//
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// HISTORY:
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// 0.3.3 2021-12-17 update library.json, license, minor edits
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// 0.3.2 2020-12-21 add Arduino-CI + unit test
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// 0.3.1 2020-08-31 updated documentation
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// 0.3.0 2020-07-04 added fastMapDouble + test sketch.
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// 0.2.1 2020-06-10 fix library.json; rename license
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// 0.2.0 2020-03-21 #pragma once; readme.md; license.md
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//
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// 0.1.8 2017-07-27 revert double to float (issue 33)
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// 0.1.7 2017-04-28 cleaned up, get examples working again
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// 0.1.06 2015-03-08 replaced float by double (support ARM)
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// 0.1.05 2014-11-02 stripped of bit mask experimental code
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// 0.1.04 add back() - the inverse map
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// tested with bit mask for constrain code (Performance was killed)
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// 0.1.03 proper name
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// 0.1.02 squeezed the code (first public version)
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// 0.1.01 refactor
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// 0.1.00 initial version
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#include "FastMap.h"
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FastMap::FastMap()
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{
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init(0, 1, 0, 1);
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}
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void FastMap::init(float in_min, float in_max, float out_min, float out_max)
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{
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_in_min = in_min;
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_in_max = in_max;
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_out_min = out_min;
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_out_max = out_max;
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_factor = (out_max - out_min)/(in_max - in_min);
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_base = out_min - in_min * _factor;
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_backfactor = 1/_factor;
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_backbase = in_min - out_min * _backfactor;
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}
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float FastMap::constrainedMap(float value)
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{
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if (value <= _in_min) return _out_min;
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if (value >= _in_max) return _out_max;
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return this->map(value);
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}
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float FastMap::lowerConstrainedMap(float value)
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{
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if (value <= _in_min) return _out_min;
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return this->map(value);
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}
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float FastMap::upperConstrainedMap(float value)
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{
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if (value >= _in_max) return _out_max;
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return this->map(value);
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}
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FastMapDouble::FastMapDouble()
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{
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init(0, 1, 0, 1);
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}
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void FastMapDouble::init(double in_min, double in_max, double out_min, double out_max)
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{
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_in_min = in_min;
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_in_max = in_max;
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_out_min = out_min;
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_out_max = out_max;
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_factor = (out_max - out_min)/(in_max - in_min);
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_base = out_min - in_min * _factor;
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_backfactor = 1/_factor;
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_backbase = in_min - out_min * _backfactor;
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}
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double FastMapDouble::constrainedMap(double value)
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{
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if (value <= _in_min) return _out_min;
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if (value >= _in_max) return _out_max;
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return this->map(value);
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}
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double FastMapDouble::lowerConstrainedMap(double value)
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{
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if (value <= _in_min) return _out_min;
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return this->map(value);
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}
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double FastMapDouble::upperConstrainedMap(double value)
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{
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if (value >= _in_max) return _out_max;
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return this->map(value);
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}
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// -- END OF FILE --
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