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warpling/MathTools.h

Last active July 28, 2017 18:36
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MAPRANGE
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MathTools.h
// Maps one range onto another
// Example: [-50, 100] to [0, 1.0]
// Example: [0.2, 1.0] to [1.0, 0.0]
#define MAPRANGE(x, inputLow, inputHigh, outputLow, outputHigh) ({\
__typeof(x) __x = (x); \
__typeof(inputLow) __inputLow = (inputLow); \
__typeof(inputHigh) __inputHigh = (inputHigh); \
__typeof(outputLow) __outputLow = (outputLow); \
__typeof(outputHigh) __outputHigh = (outputHigh); \
(((__x - __inputLow) / (__inputHigh - __inputLow)) * (__outputHigh - __outputLow)) + __outputLow; \
})
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