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In this lecture, we're adding lives and scores so that we run over coins.

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Our score goes up and when we plummet to our death drop, it shows how many lives we've got.

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And we've just reset our score back to zero and our lives back to three.

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Let's get started.

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Let's start by creating a canvas.

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So right click UI and then we'll find canvas.

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And then from within canvas we want to change something.

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I'm going to change the canvas scalar to be scale with screen size just in case we make some changes.

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And my reference resolution 1920 by 1080, you don't have to follow that.

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You can do whatever you want in there.

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But I just find this as handy for me when I'm making a game that's mostly going to be for me playing

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on my PC.

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And then next step under canvas, right click, we're going to create UI and then look for text mesh

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pro.

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That's the new way of doing font.

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You can use text, that's fine, but text mesh pros can be a little bit better.

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Import TMP Essentials currently we still need to do that step.

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Don't need to do the extras and examples, but if you have any issues later on, maybe come back and

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explore that under here.

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I'm going to change the text name to be What is this?

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This is our live text lives text.

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Drag that up into the top left, which is where I want it to be and increase in size, make it 200 will

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say it's probably a little bit too big.

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But what I'll do is in the text field I put in 99 because that's how many maximum lives I think the

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play is only going to have up to nine lines.

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But it's good to make sure that if for some reason you get crazy in, the player can end up with 11,

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12 or 15 lives.

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Then you want to make sure it all fits.

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Actually, you know, what we should do is give ourselves a different font.

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Let's go through that process.

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So I like the font as my place to find fonts and I've just searched around for pixel and I found some

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text and I'm downloading that.

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If you click to download and then find where it has downloaded, you'll need to unzip that file and

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then once you've unzipped, you can go back over into Unity.

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I'm going to create myself a new folder in the assets.

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So click on folder.

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We'll call this fonts, double click in fonts, and then I'm going to find where I've unzipped my font

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to drag that on in to Unity.

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Now there's one more step we need to do in here, which is to jump up to window fine text mesh, pro

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font, asset creator, drag our font up into here blank and then click generate font atlas save and

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we're going to save it into our fonts folder that looks good as well.

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X Out of that window, click back on Live's text and then drag over our font in to font asset and it

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will will look a little bit more pixel three.

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That's all right.

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It's probably a little bit too big.

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So I'm going to change it down to say, 150 and I will anchor this up in the top left of my screen to

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know that it's going to be there no matter what's going on in my resolution.

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There's a little bit of a padding at the top of my font.

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Let's see if there's a setting in here we can change to make it go to the top.

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It is currently at the top, not middle, not bottom.

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So I guess the font just has a bit of a padding at the top of it, which is a little bit annoying,

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but I think that will be high enough up on our screen.

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We can always do it a little bit above the screen.

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Yeah, we'll do that live on the edge.

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Need to have it nice and big so my old man eyes can see it, so it looks fine.

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What I'm going to do next is click on live text control D to duplicate that, scroll up to the top,

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change the name to B score text and then drag that over to the right hand side.

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Make the box a little bit bigger just in case we need it.

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Right.

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Align this one.

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Yep.

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And then I'm going to add in a few more numbers.

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99999996 digits in there just to make sure it all fits on the screen, which it kind of doesn't.

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Is that going to be okay?

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Yeah.

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If the play is up to hundreds of thousands of their score, you want it to take up a big amount of the

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screen.

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Let's click on play and see if this is going to work and see what errors I think we're going to get.

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Okay.

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It works.

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It looks good.

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I'm happy with that.

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We get the errors.

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Those errors are because we're using text message pro with a new input system and there's a little bit

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of conflict going on in the event system here.

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It's not happy with this.

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So what I'm going to do is click on the event system and then replace with input system input module

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in there and then console clear.

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Hopefully my errors now go away because basically we've said get with the Times man, we're living in

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the future.

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You should be able to work with what we're trying to do here and it's happy, happy with our new input

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system.

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Now let's get the numbers updating properly.

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So I'm going to jump back into my project folder, find scripts and open up game session, because I'd

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like to have game session managing.

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What's your score?

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How many lives do you have?

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If you lose a life, then your life and score persists.

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It knows what's going on and if you restart the entire game then it restarts.

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So I'm going to have all that kind of manage through this game session manager It's a nice way to do

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it.

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So we'll open up our game session script, give ourselves a couple of fields in here because we need

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to be saying, what is the particular text we're interested in?

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So serialize field and the variable type is going to be text mesh pro you g ui.

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It's a bit of a mouthful, but that's what we need to do.

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And this first one will be our lives text semicolon.

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And I'm not getting the squiggly line because I think I've broken Visual Studio code again.

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This happened to me a little bit recently, but I'll persist with that.

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I know that as of yet we're not using the right namespace so jump up into using and I need to look for

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tmp rho to mpro.

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That is a tap.

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To that.

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Now I'm going to add a second variable while I'm here.

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So I'll copy my live text, paste it down below that, and we will rename this to B score text.

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Do this while we're here, score, text, save and let's hook that up.

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I often forget this step, so let's do it right now.

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Before I forget, we need to go to game session and tell it what these two fields are.

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So I'm going to drag lives.

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Text from canvas into Live's text and score text into score text.

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Isn't it nice when I name things properly and don't mess that up now?

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We need a way of saying that this number here, should it become this text field just here underneath

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a wake, we'll create a start method or recreate that.

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And so the conversion of saying, Hey, this is an integer and that is a string, the way we do that

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is by first of all, tapping into the text.

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So the lives text and the field we're looking for is text, text, and that's going to equal player

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lives to string parentheses and semicolon, turn the integer into a string.

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Let's save and see how we went with that.

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Back over into Unity, click on play and we can see we have three.

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Excellent.

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Not yet persisting.

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If I die it doesn't go down to two.

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Goes back to 99.

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That's cool.

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Let's keep working on that.

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So the next thing we need to do is say, well, under process player death, which has been called when

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the player has a mishap, we know that we're doing a take life.

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When we take the life, we want the player's lives to go down by one.

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And we also need to display that on the screen.

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So let's grab our lives, text boink, copy that.

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Jump back down to take life and we'll add that line in there.

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So once again, it's saying, hey, update this, make sure this is accurate on the screen.

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So let's save back over into unity.

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Click play again, boom, boom, boom, jump and went down to two, then back to 99.

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That's because it's not persisting yet.

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We have our Singleton on game session, but we don't have any such singleton on our canvas or our lives

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text.

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And we could put a singleton, we could create a script to say, Hey, do this and do that.

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But there's a nifty thing we can do here, which is grab canvas, drag it underneath game session.

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So it's now a child.

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That means that the singleton we've got on there that don't destroy on load there can be only one is

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going to be applied to all of the children underneath game session, which is really handy.

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It's a little plus.

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That means we need to click on game session and apply the override.

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So apply all.

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So that's applied to the prefab.

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Now when I click on play, I think we're going to be pleasantly surprised when we jump into the spikes

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going, goes down to two, stays at two down to one and what happens at zero?

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We go back to three because it restarts.

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So mission accomplished with our lives.

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And if you haven't guessed already, I'm going to give you a challenge to do the same thing with our

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score.

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What we need to do is when we pick up a coin, we want to increase our score by a certain amount, say

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100 points.

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This is going to be a little bit more advanced because you need to think about passing in a variable

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that says How many points do we want to increase it to?

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It's a bit different to lives where it's always just one.

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We want to have the ability to change the number of points for different coins because like I'm saying,

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we want the ability to set different coins to different points value.

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We want to display that to the screen, obviously, and we want it to persist when the player loses

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a life and we want it to return to zero when we start a new game.

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So there is your mission.

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Jump in, take that on.

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I'll see you back here when you've given it your best shot.

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Okay.

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Let's jump back over into our game session script.

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I'm going to add a new variable at the top here, which will be a type serialized field.

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It will also be an integer and I'll call that just score I think makes sense and that equals nothing.

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Well then initialize it nothing because you start with nothing and then you have to get something.

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And likewise down in start we need to say, hey, print that to the screen or show it as a string to

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string.

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So I'm going to copy my lives, text, paste that in, and instead of it being Live's text, it's going

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to be score text and instead of being player lives is going to be just straight up score.

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And just as we have a public method called process player death, I'm going to add a public method which

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will be all about score.

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So public void, no return type, and we'll call this add to score or increase score, add scores,

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fine.

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And then we need an integer that we're asking for to be passed in and call this points to add the points

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to add to the score.

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And we start with the score we currently have and then we want to plus equals.

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So whatever our score is now plus something to that score, the way we write that is plus equals.

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And we're adding what to it?

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We're adding the points to add points to add semicolon.

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And if we want to be able to see that, we need to do the same step we did up here, which is turning

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our score text into a string.

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So I'm just copying from my start method and then finding underneath my points to add paste that in.

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So add the points and then show it on the screen.

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And then we need to call this method.

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So I'm going to jump up into my explorer, I'm going to find out what is it here that we're looking

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for our coin pick up.

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Click on that pop.

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The Explorer closed again.

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Create myself a new variable so serialize field and this would be of type integer and this will be points

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for coin pickup.

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How many points do you want to get?

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And I'll initialize that at say 100.

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I think that's a good clean amount.

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And then just as we did in our player movement, at some point we need to increase that score when you

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run over a coin.

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So I'll pop this at the top here.

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I'm going to find object of type and that will be game session parentheses dot.

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And then we need to call the method we've just created a moment ago.

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Add to score and what do we need to pass in there?

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How many points do we need to increase it by?

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Well, it's this variable that we've just created points for coin pickup semicolon.

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Okay, so we're calling our public method and our public method is saying add to the score by however

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much you tell me to add to it and then print that to the screen.

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So let's see if this is working and just looking at this level, it's not going to work too well because

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I don't have any coins in there.

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So let's go and add a coin or two.

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I know I said this wasn't a coin level, but let's add a couple in there so we can do our testing.

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A couple of coins.

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I don't even need to do the jump.

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Then we'll click on play.

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We'll see what happens when we run over a coin.

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Hopefully it starts at zero with our score.

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It does, and if we don't, the link makes a noise and we'll win.

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Hello.

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Quick message here from Rick from the future.

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We found some folks who have had a bug with the coin pick up where they're picking it up twice.

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So I'm just coming back and adding a little bit of an addition that you can add in here if you're having

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that problem of the coin being picked up twice.

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Thank you very much to the folks who raised this and to Nina, our wonderful teaching assistant, for

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giving me a solution to this.

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So pretty easy solution to say if you've picked something up, let's make sure you can't pick it up

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again.

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We'll add a ball, we'll call this was collected and we'll set that at false to start off with.

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And now what we want to do is to say if the other tag is player and what and was collected was collected

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is not true.

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We can write that by saying exclamation mark was collected.

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So and if it wasn't collected is what we're saying, then do all this stuff.

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But first of all, we want to say, well, it is now officially was collected equals true.

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Yes, we collected it.

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So that should solve all your problems saying okay, it's been collected once we can't collect it again

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if you still having issues.

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One thing that Nina thought you could do is just before you destroy the game object, you could add

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this extra line which is game object dot set active is false.

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That's another way of saying, Hey, just deactivate this game object, make sure it can't do anything

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else.

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So this line might not be necessary for you, but just an extra step.

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Want to make sure super, super duper got you covered in case you're getting that double coin pick up

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issue, which might be triggering two sound effects or might be giving you double points.

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So there you go.

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There's one solution for that hopefully that helps and works out for you.

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So there we go.

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Mission accomplished.

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The one thing I would like to do, though, is when I die on my coins return.

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That's not very cool.

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You can just die and get your coins over and over again.

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So in the next lecture we'll do that so that the coins behave properly when we die and reloading the

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scene.

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So good stuff.

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I'll see you in the next lecture.