mirror of
https://github.com/RobTillaart/Arduino.git
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93a4857bc4
+ added back function to "reverse map" + fastMapDemo2 shows usage of 2 FastMaps + fastMapDemo3 shows usage of back function + FASTMAP_LIB_VERSION in PROGMEM
58 lines
1.3 KiB
C++
58 lines
1.3 KiB
C++
//
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// FILE: FastMap.cpp
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// AUTHOR: Rob Tillaart
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// VERSION: 0.1.05
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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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// 0.1.05 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(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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//
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// END OF FILE
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//
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