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59 lines
1.4 KiB
C++
59 lines
1.4 KiB
C++
//
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// FILE: FastMap.cpp
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// AUTHOR: Rob Tillaart
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// VERSION: 0.1.06
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// PURPOSE: class implementation of map function - library for Arduino
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// URL: http://forum.arduino.cc/index.php?topic=276194
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//
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// HISTORY:
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// 0.1.06 2015-03-08 replaced double 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 (Perfomance was killed)
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// 0.1.03 proper name
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// 0.1.02 squized 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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//
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#include "FastMap.h"
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/////////////////////////////////////////////////////
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//
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// PUBLIC
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//
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void FastMap::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 FastMap::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 FastMap::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 FastMap::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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//
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// END OF FILE
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//
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