scale.cpp

scale.cpp

//
//  rescale.cpp
//  CplusplusPractice
//
//  Created by masai on 2015/05/20.
//  Copyright (c) 2015年 masai. All rights reserved.
//

#include <iostream>

template<typename T, typename U>
U rescale(T x, T src_min, T src_max, U dst_min, U dst_max) {
    U value =  static_cast<U>(((x - src_min) * (dst_max - dst_min)) / (src_max - src_min) + dst_min);
    return std::min(dst_max, std::max(value, dst_min));
}

int main(int argc, const char * argv[]) {
    int a = 10;
    int b = 1;
    int c = 100;
    int d = 300;
    int e = 500;
    int result = rescale(a, b, c, d, e);
    
    std::cout << result << std::endl;
}