How do two objects always keep the same distance from each other?

As the two objects move in parallel and always the same distance, I believe that the simplest solution is to directly second object according to the position of the first, plus an offset distance.

A simplified example follows:

The sp1 object follows the coordinates of the mouse (every tick event):

Set position to (Mouse.X, Mouse.Y)

In the same event, you add an action by changing the position of the object sp2 for a fixed distance from the position of sp1 (in this example, 150 units in the X axis):

Set position to (sp1.X + 150, sp1.Y)

The Event sheet looks like this:

Thelerpfunctioncalculatesa linear interpolation between 2 points, and can to be used, for example, to smooth the movement of an object:

lerp(a, b, x)

For the above function call, it returns the value of a + x*(b-a) .

In the example, if you replace the action with the object sp2 with:

Set position to (lerp(sp1.X, sp1.X + 300, 0.5), sp1.Y)

It will achieve exactly the same effect, however, with a higher processing cost.