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#include <iostream>
#include <assert.h>
struct Color {
double r, g, b;
Color() : r(0), g(0), b(0) { }
Color(double r_, double g_, double b_)
: r(r_), g(g_), b(b_) { }
};
// Convert a double in [0,1] to a color
template< typename ColorType >
void double_to_color(double t, ColorType & color) {
assert(t >= 0 && t <= 1);
double s = 1.0/6;
if (t >= 0 && t <= s)
color = ColorType(1, 6*t, 0);
else if (t > s && t <= 2*s)
color = ColorType(1-6*(t-s), 1, 0);
else if (t > 2*s && t <= 3*s)
color = ColorType(0, 1, 6*(t-2*s));
else if (t > 3*s && t <= 4*s)
color = ColorType(0, 1-6*(t-3*s), 1);
else if (t > 4*s && t <= 5*s)
color = ColorType(6*(t-4*s), 0, 1);
else
color = ColorType(1, 0, 1-6*(t-5*s));
}
int main (int argc, char * const argv[]) {
double number_to_convert = 0;
std::cout << "Enter a real number in [0,1]: ";
std::cin >> number_to_convert;
Color color;
double_to_color(number_to_convert, color);
std::cout << "The corresponding color in rgb is: (" << color.r << ", " << color.g << ", " << color.b << ")\n";
}
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