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[MUSIC] 2

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In this video we're going to hook it up so that when all the blocks are destroyed, 3

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we load our next scene. 4

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Super exciting, so let's get started. 5

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One thing I didn't talk about fully in the previous video that I'll touch on now is 6

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each of these blocks, you've got one, two, three, all the way down to ten blocks. 7

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Each of these blocks contains the script block. 8

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And on that script block we have, we're saying, we're calling the method, 9

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CountBreakableBlock which basically just increments the number of blocks by one. 10

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And the reason that adds up the total number of blocks is when we start 11

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the game, every single one of these instances, these are instances of our 12

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prefab, every instance says, do the thing that is on my script. 13

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So count me as a block. 14

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And then this one says, add another block. 15

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And this one says, add another block, add another block. 16

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So each of these are saying add another block. 17

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And so they're doing that ten times. 18

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That's why it's adding up in our level. 19

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It's adding up all the breakable blocks. 20

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Each of them have said count me, and that adds up to ten. 21

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Okay, so just wanted to be super clear with what's going on there. 22

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Now we're gonna jump into level.cs. 23

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Again, we need to create ourselves our next public method. 24

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Cuz if we look at our flow we can see that we have gone through, 25

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we've created a level object, we're keeping track of breakable blocks, 26

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we're adding up the blocks. 27

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Now we need a method to signal that a block was broken, 28

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an if statement to load the next level if the blocks is zero, and 29

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then also to tell each block to remove itself when it's destroyed. 30

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Remove itself from the total number of breakable blocks, and 31

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that's what we're up to at the moment. 32

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The first thing we'll do is create a public method, public void, and 33

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we'll call this one block destroyed. 34

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Block destroyed. 35

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I have an enclosed parenthesis, I have enclosed curly braces brackets, 36

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and then within here we want to say, 37

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well I'm gonna basically say the opposite to what's happening up in here. 38

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When a block is destroyed we want it to say hey, decrease the number 39

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of breakable blocks by saying breakable blocks minus minus, and then semicolon. 40

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Now what else do we need to do? 41

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Well, within here as well, at the same time that a block is destroyed, 42

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we want to say right now hey, have the number of blocks reached zero? 43

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So put in an if statement, if, and then our parenthesis we 44

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wanna say if the (breakableBlocks) is less than or 45

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equal to 0, then what do we want to have happen? 46

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Well, what we wanna have happen is to load the next level. 47

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So we know from our ScreenLoader, so we have a ScreenLoader class. 48

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We've already created a load next level method, so we wanna call that. 49

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If you remember, I'll find object of thought. 50

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And once again, I will cache this as a reference just so 51

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that we don't have to find the object of type every single time. 52

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And so to do that we will say SceneLoader, 53

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capital S, SceneLoader, and then sceneloader. 54

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So this is just a way of saying we now have a variable, 55

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sceneloader variable that have type SceneLoader. 56

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And again I'll just make a note in here, cached reference, so 57

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that we know this is our cache not the thought we have, 58

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our parameters, parameters, that we need to keep track of. 59

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Just helping you guys see that this is the structure we have at the top of our 60

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script, so you can get into the habit of putting things in the right place. 61

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You don't have to write in your comments each time, 62

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I'm just doing that to make it clear from a teaching point of view. 63

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Okay, so we have our scene loader, now if breakableBlocks is less than, 64

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sorry in our start method now. 65

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I've jumped a step ahead. 66

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What do we need to do next? 67

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This is a question for you. 68

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Many challenge for you. 69

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How do we get access to our sceneloader? 70

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How do we cache that? 71

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Well, we say Start. 72

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Hit Tab to autocomplete, and then we will say sceneloader = what? 73

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Another mini challenge for you, complete that sentence. 74

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sceneloader = FindObjectOfType. 75

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Angle brackets, and within here we're finding capital s breaks Sceneloader. 76

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Open and close parenthesis, semicolon. 77

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So now we know that SceneLoader is a cash reference to the class or 78

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the objective type SceneLoader. 79

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Now in our if statement down here, we can say, cuz we need to access sceneloader. 80

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What are we accessing in there? 81

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We're accessing load next scene. 82

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So, here's another mini challenge for you. 83

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Let's load the next level. 84

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Okay, you're just waiting for me to continue, 85

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are you actually doing these mini challenges? 86

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It's okay if you're not but this is how you really get better at these things. 87

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If you push yourself and pause and try to figure it out on your own. 88

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That's how this really embeds. 89

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It's cool if you're not, but it's even better if you are. 90

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So we'll say in here sceneloader.LoadNextScene. 91

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Open and closed brackets and semi-colon. 92

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So now we've created our, when a block is destroyed, we want to yell hey, 93

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block is destroyed. 94

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We decrease the number of blocks by one that are breakable, and 95

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then we say if it's reached 0, then load the next scene. 96

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I'm gonna save that hop over into block, and 97

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this is where I'll give you your proper full on challenge. 98

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That was our last level. 99

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It's our last lecturer. 100

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That's what I'm after. 101

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Update Block.cs. 102

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So here is the challenge. 103

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Call our method for decreasing the number of blocks when a block is destroyed. 104

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Update Block.cs, and ensure that you have your build settings correct. 105

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We haven't done that yet for this scene. 106

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You might have done it but I haven't done it yet. 107

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And to test and rejoice that it works. 108

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And another little hint for 109

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you, you might wanna decrease the number of blocks in your scene to one just so you 110

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don't have to get rid of all of the blocks you can text it a little bit more quickly. 111

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Okay, so as your challenge jump in and get started. 112

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Okay, so within Block.cs, we need to find our OnCollisionEnter, 113

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this is where things are getting destroyed. 114

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Underneath Destroy, we want to give an update in here that says, 115

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well not an update, but we wanna call our method in here. 116

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I'm thinking that it's updating the situation but it's not the update method. 117

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We're saying level, we've already created ourselves a cash reference to the level. 118

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So level., and what do we have in here? 119

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It's gonna be BlockDestroyed );. 120

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So we're saying access the level class that we're doing and lock is destroyed. 121

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Pretty straightforward. 122

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Now I'm gonna do one more step while I'm in here which is just to factor this out 123

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to clean it up. 124

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This is a refactor, it's not critical. 125

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Things will still work without it, but this is just for readability. 126

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Not to do too many things under this OnCollisionEnter. 127

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So I'm gonna highlight my three lines here, right-click. 128

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Slightly different on the Mac, you'll see. 129

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Quick Fix and then Extract Method. 130

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On a PC, Quick Actions and Refactorings, and then Extract Method. 131

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We'll call this method DestroyBlock, and then hit Enter. 132

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So basically, Whenever we collide with the block, then we want to destroy the block. 133

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Okay, I'll call DestroyBlock or, yeah, that's good for now. 134

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It'll change a little bit later on, but for now, this is what we've got, so 135

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this is the best thing to call it. 136

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Save that, jump over into our game. 137

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Now, I mentioned about Build Settings, Edit. 138

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Sorry, File > Build Settings. 139

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And one thing you'll notice with our Build Settings is that we don't have any level 140

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two sitting there. 141

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So I'll just click Add Open Scenes, cuz level two is open at the moment. 142

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Now I'm gonna cheat a little bit and drag this above level one so that when we win 143

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level two it'll take us to level one, just to make it easy for testing purposes. 144

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And as I mentioned before I'm gonna select all of my blocks except for one. 145

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Delete those, click Play, we should see if I click on level, 146

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we should see that there are one breakable blocks, yes there are, 147

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click back in my game window, [SOUND] and then plonk, and Game Over. 148

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Didn't work, okay, what have we not done in here? 149

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We're looking for in our level, we didn't go through this quite in enough detail. 150

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We have SceneLoader, I've forgotten that we don't have SceneLoader in our scene at 151

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the moment, do we? 152

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That was an assumption that I made was incorrect, so on level I'm going to drag 153

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in SceneLoader, so drag SceneLoader as a component on level now. 154

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When we're saying fine object of type, here it is right here sceneloaded.cs 155

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is another way of saying it's the SceneLoader class, 156

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and it's in our scene because we have it sitting right here on level. 157

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Make sure on level we can click Apply, so it applies all these back to the prefab, 158

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so when we drop in level and future levels, it knows what's going on. 159

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So just a reminder, why I was doing that is we're looking for 160

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FindObjectOfType SceneLoader, but 161

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we didn't actually have any SceneLoaders in our scene just yet, and now we do. 162

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So save everything up, click on Play, look to see if there's any errors. 163

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I don't know how long that errors been there but it's now gone. 164

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So there is no error, fantastic. 165

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And we click and it should, plonk, load into the other scene. 166

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That's great, very excited to see that. 167

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So excellent work, we now have a fully functioning game. 168

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You can add a couple of these blocks back if you want. 169

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I'm just gonna add one more, so we've got two sets. 170

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It looks a little bit more like a game. 171

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And so when we complete this scene, it will load the next scene. 172

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That area has reappeared down the bottom of the screen but 173

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that should go away when we click Play. 174

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We can now play fully through a full game loop where the player can start, 175

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win, lose, and restart the game. 176

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So great work, and I'll see you in the next lecture.