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OK, so we've got our volume slider here and it's looking pretty good, but it doesn't actually do anything

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when we slide this thing around.

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So let's work on that in this video.

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So I'll clear the screen here and back over to our coat and inside of our volume.

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Slider, where are we to find it?

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Let's give this a command, equal volume and now we need to create that function.

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So head back up to our.

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Function section here, and I'm just going to put this at the bottom.

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So let's go create volume function and let's define this.

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Now, this one's a little different, we have to actually put something here because whenever we move

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our slider, it's passing whatever the position argument, the position number is into the function

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that we call.

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And when we do that, this function needs to be waiting to sort of listening for that number.

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And so we're going to assign that number to the variable X.

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Now, we're not actually going to use this variable, but still the function knows it's supposed to

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be listening for that.

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So if we don't put that little X there, we're going to get an error.

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So we'll just leave that there for now.

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So let's take a look and see because we haven't really talked about sliders.

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Let's come down here and grab our temporary label thing and let's just come up here and let's just see

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what the slider does when we move it around.

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So let's let's my label config.

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And let's give this a text equal, whatever the name of our slider is, which is volume slider.

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Now we can get the current position of the slider by calling volume underscore slider doget and then

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put your little function thing so and we could just output this onto that text.

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So let's go and save this just to see what the heck this is actually doing, because this is kind of

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interesting.

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So we've got our slider and we move it and we could see it's a it's a decimal, it's a float, so point

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five, six, six, it starts at zero.

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And at the very top here, the very bottom, I should say, is at one.

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So.

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One is the high, obviously, zero is the low, why is it zero and one because when we set this thing

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up, we set the from.

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To zero and the two to one, if we set this to one hundred, the bottom position would be one hundred,

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right.

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But we want it just from zero to one because I mentioned PI games, volume control's returns, numbers

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from zero to one.

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So that's what we want it to be.

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So you might wonder why there's an underscore here under from from is a python key word.

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So we can't use from encounter but we can use from underscore.

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So that's sort of what they do.

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It's just the convention.

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So, OK, we're getting a float now up here between zero and one.

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So zero point something, zero point one zero point two and zero is obviously no sound.

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And one is obviously the most loud sound there can be.

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Right.

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And before we move on, I want to show you one other thing.

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Let's run this thing again real quick.

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You know, it starts at zero, I think I want it to start at one because we want the volume to start

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loud.

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We don't want the volume to start, you know, at zero zero is nothing.

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You can't hear zero at all.

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Or if you want, you could put it at halfway point five or whatever.

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But I'm just going to blast it out at one the highest volume to begin with.

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So how do we do that?

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Well, we do that really simply in our volume slider where we defined it here, this volume frame,

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we just come here and we could just set a value and almost set the value equal to one.

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So now if we save this and run it.

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You can see now it starts out down here, so that's better.

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So, OK, now the only thing left to do is have this thing actually change the volume right here so

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we can get rid of this label thing.

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We don't really need to know what the volume is at any given time.

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Now we need to actually write the code to change the volume.

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So how do we do that?

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This is actually very, very easy.

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All we have to do is go pygame.

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That Mixu music dot said underscore volume, and this is a function and what do we want to send it to?

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We want to send it to whatever the slider is right now.

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And we know from our label we just deleted that we can get the current slider position by calling volumes,

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underscore slider and get it's there we go.

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And then passing in the little function brackets and that's it.

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So we can save this now and let's try this out.

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So let's run this guy.

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Hold on over, let's add a bunch of songs.

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And let's play one.

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How to move the volume down?

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Can you can I tell and then it's gone.

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So let's do a.