Altitude Calculation

I'm making a puzzle game where the player manipulates a see-saw to fling an object into a goal.

I would like to have an on-screen altitude readout showing a constant readout of the object's current altitude.

How should I write the event to calculate this?

are you throwing the object with physics ? If so then I think it would just be a case of

every tick     text:set text object.Y

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or are you trying to calculate the position with gravity and mass and velocity... ?

example

edit - altered capx so displaying height only while object is moving. (is physics sleeping/else)

Create a variable StartY and on start of layout set it to object.y

Create a variable Altitude and every tick set it to round(abs(object.y-StartY))

Edit: Removed "de" (stupid swype keyboard!)

I will try both those options - thank you very much!

The calculation just needs to be a simple arbitrary number: X meters off the ground.

Create a variable Altitude and every tick set it to round(abs(object.y-StartY))de

What does the "de" do? Construct 2 is throwing and error when I type that in.

Take off the de, I don't think he meant to put that.

It was my tablet-keyboard acting funny..

Sorry..

A simpler option without variables might be to just take the Y value of your ground level and set your text to the difference between that and the object's Y value. So just something like Set Text to GroundY - ObjectY. Or if you want it always relative to the catapult, use catapult.Y instead of ground.