How do I simulate the arc of a bullet?

I want to calculate a smooth curve for a sprite following my hidden bulle to simulate gravity in an isometric view.

I can manage make a linear decline based on the distance travelled, but i want a smooth curve similar to what I'm trying to illustrate in this image. Is it possible with math/expressions to get that kind of decline? and what expressions calculations should I use?

What I'm trying to achieve is to adjust the Y position (distance between the bullet and the sprite) following the bullet in a more curved fashion, rather than a linear decline (showed in red)

Have you tried to use the Physics behavior?

I'm not quite sure because I never used it, but I think it might be just what you need

To clarify.

Each bullet has 2 instance variables which i use to calulate the decline.

"bullet.traveldistance" = how many pixels the bullet will travel before it's destroyed.

"bullet.offset" = They Y offset of of the sprite following the bullet, based on the distances between the player and the traveldistance instance variable.

When the bullet is created the offset is '-40' ... when the bullet reaches the endpoint the offset value is '0'

So somewhere inbetween here i need to do some adjustments to the offset in order to get an arc.

Have you tried to use the Physics behavior?

I'm not quite sure because I never used it, but I think it might be just what you need

I've tried it but it doesn't really work in this case. I'm basically just looking for a way to calculate an arc.

I googled a bit but I'm not a math genius but i think I have to add another value.. to add (Sagitta) af an arch to the 'offset' value.

So now comes the REAL question. How do i write this formula in construct?

s = ut + at^2/2 in 2 axes.

I note this is isometric. I would be inclined to calculate it in real world coordinates and then convert to isometric ones.

You might want to look at the Sine behavior.

Here's how I'd do it. Cheap and easy !

You might want to look at the Sine behavior.

Here's how I'd do it. Cheap and easy !

nice example. thanks! Thats not a bad solution!

I managed to make it using the sin expression instead.

I made this example a while ago - it's simple and produces a reasonable effect if you know where you want your bullet (arrow in this example) to land - in 2d or isometric.