Question

My engine (AndEngine) provides the modifier to move an object by Bezier Curve path, just by providing 3 or 4 points co-ordinate.

In my game, I move some birds with determined 3 points. However, it looks fake because the birds always point to a direction.

This looks like a mathematical question, but I think I should post at StackOverflow instead of Math Exchange: How to determine the rotation angle (in radian or degree) for the birds at a time?

Answer 1

You will take two points say P1 and P2 and will find the angle between them and then rotate you bird on that angle

    deltaX = nextPointX - YourBirdX;
    deltaY = NextPointY - YourBirdY;
    degree = ((Math.atan2(deltaY, deltaX)));
    angle = degree * 180 / 3.14;

    if(angle<0)
    {
        angle = 360+angle;
    }

I hope this will help you.