I'm using a sine wave behaviour to move a sprite but i don't want it to 'dip' below it's starting position. Take a look (please excuse the crude drawings lol!):
The straight line is the sprite's (star) starting position and this is how I have it, as you can see it dips below the sprites starting position. Imagine the straight line is the bottom of the playing area then the sprite would disappear off screen as it dips below and I don't want this.
I would like to have it move like this:
I know I can do this if i start the sprite further up the curve but that's not what I want. Is it possible using the Sine wave behaviour? My maths is non existent so I really don't want to uses mathematical expressions if at all possible.
Any help would be really appreciated.