float dy = y2 - y1;
float delx = input - x1;
output = (grad2 * dx + grad1 * dx - 2*dy) / (dx * dx * dx) * delx * delx * delx +
- (dx * dx) * (3*dy - 2* grad1*dx - grad2*dx) / (dx * dx) * delx * delx + grad1*delx + y1;
+ (3*dy - 2* grad1*dx - grad2*dx) / (dx * dx) * delx * delx + grad1*delx + y1;
}
else if (config.smoothMode == HISTOGRAM_BEZIER)
{