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65 lines (52 loc) · 1.86 KB
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/*
* @file mapInt.c
*
* @author Andy Lindsay
*
* @version 1.1.8
*
* @copyright Copyright (C) Parallax, Inc. 2018. See end of file for
* terms of use (MIT License).
*
* @brief mapInt function source, see simpletools.h for documentation.
*
* @detail Please submit bug reports, suggestions, and improvements to
* this code to editor@parallax.com.
*/
#include "simpletools.h"
int mapInt(int value, int fromMin, int fromMax, int toMin, int toMax)
{
// n - numerator
// d - denomenator
// irt - integer rounding term
int n = (value - fromMin) * (toMax - toMin);
int d = (fromMax - fromMin);
int irt = d / 2;
if( ( (n > 0) && (d < 0) ) || ( (n < 0) && (d > 0)))
{
irt = - irt;
}
int val = (n + irt) / d;
return val + toMin;
}
/**
* TERMS OF USE: MIT License
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/