How to make a curved slider progress bar?

How can I slide the arrow on the curved bar to change the time of day?

I’m a beginner with blueprints, even more in the float/vector part.

Could someone show me how I can do it?

this way:

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sorry. simpler material:

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You are awesome!! I would never have imagined this.

In this case, I would like to move only the white arrow which simulates that it will go through the red curved line, causing the time to start from one point to the other by changing the time (from 1 am to 12 pm). It’s the same principle, right?

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Another image to improve understanding

Yes. I added a slider just to show the effect. But it just handles the material parameter form 0 to 1 to update the curve. You can handle that parameter with any input

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Oh I just seen what you mean with the white handle. So you want to drag it along the curve?

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! Only the white handle.