color cheer interpolator

//_r, _g, and _b are the current color values
int _max = 100; //cheer amount that will simply change the color to the specified color
                //anything less will interpolate and shift dynamically

//values received from chat message
cheer = 57;
cheer_red = 230;
cheer_green = 110;
cheer_blue = 0;

double interp_value = cheer >= _max ? 1.0 : cheer / _max; //calculate interpolation amount

_r += ((cheer_red - _r) * interp_value);
_g += ((cheer_green - _g) * interp_value);
_b += ((cheer_blue - _b) * interp_value);
//clamp _r, _g, and _b, and they are now the transformed color