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[SOUND] >> Hello again, 2

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in this video we are evolving our attackers so that when they bump into 3

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a defender and, here we go, something, don't shoot, there we go. 4

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They start to switch animation state to attacking and 5

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start to attack the defenders. 6

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So let's jump in and get started. 7

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Right, let's have a look at what we have got. 8

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In our attackers, we have got one attacker which is the lizard and looking at it now, 9

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the collision is in slightly the wrong spot. 10

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So I'm gonna change the collision, clicking on Edit Collider, just move it up 11

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so it's actually over the lizard and not just hanging out in a weird spot. 12

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There we go, apply that back to be PreFab. 13

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All right, now I've got one lizard. 14

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What else do we need? 15

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Who else do we need in our game? 16

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Well, let's have a look at that. 17

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I am gonna have in my execution of this game a lizard, a fox, a weird jelly or 18

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jello kind of dude, and this guy who's called Jabba for some reason, 19

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I guess because he looks like Jabba the Hutt. 20

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And well done, Rick. 21

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Good work. 22

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[LAUGH] I'm just like Sherlock Holmes for figuring that out, aren't I? 23

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Okay, so I've got speed, attack, health, and a special ability. 24

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This speed and attack and health, I'm not gonna go into too much detail. 25

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It's kind of regular guy, fast guy. 26

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And then this guy's a little bit different, and 27

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that guy's a little bit different as well. 28

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In terms of the special, the lizard doesn't have a special, 29

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he just runs up and hits things. 30

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The fox is gonna jump over particular things, 31

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specifically the gravestone or the, is that what we're calling it? 32

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Gravestone, yes. 33

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That we put into our game doesn't stop the fox. 34

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The Jello guy, gotta make myself North Americanized, is Ghosting. 35

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So he doesn't bump into anything. 36

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Just goes walk, walk, walk, walk, walk, right through everything. 37

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And then this big old guy goes really slowly. 38

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Classic kind of tank dude smashes into stuff. 39

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And I'll leave a question mark here. 40

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This is gonna be something that at some point you can go ahead and 41

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make a cool special move for the Java character. 42

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Now what do we need to do in what spot? 43

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We've gone our three scripts I'm gonna be referring to. 44

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Attacker and then Lizard script or 45

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Fox scripts is gonna be specific to the individual attackers. 46

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So each character, each attacker will have its own script and then health. 47

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With an attacker, we want it to move left, we've done that, set speed, 48

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done that, update animation state, we'll do that, and attack a specific target, 49

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we'll do that as well. 50

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What I mean by specific is we want our attackers to only be attacking 51

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one defender at once. 52

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And then on, say, the lizard script, or on the Fox script, or 53

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on the Java script, we will listen for the collision. 54

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So I'm gonna see when collision takes place, and 55

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then we're gonna be executing the specific behavior of jump etc. 56

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And also saying now it's time to attack. 57

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And then on our health script, well, we're tracking current health and 58

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decrease in health. 59

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Okay, so, let's start the process of giving our lizard what it needs. 60

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First of all, it needs an attack animation, so let us go and 61

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get ourselves sorted out there. 62

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If you look for sprites, for me, it's the Not In Use and we've got Lizard Attacking. 63

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I'm gonna drag that into Lizard. 64

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Now there might be something specific about the lizard attacking Sprite sheet. 65

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when you have a look at it, yep this is happening here. 66

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You can see 2048x607, and when we do our calculations, there is I believe 15x6, 67

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it ends up with a weird something, something point, something or rather. 68

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It doesn't quite make sense. 69

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What's happening here, is our original, Sprite is bigger than that. 70

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Let me see if I right-click, Show In Explorer, 71

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we'll see what the original file is in here. 72

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I'm gonna right-click, Show Properties, Properties, 73

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and we can see it is under Details, 3765x1116. 74

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So it's a much bigger image, but when we look in Unity, it thinks it is 2048. 75

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And the reason that's happening is our maximum size for 76

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our default has been capped at 2048. 77

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So if you click on default, you might be clicked on one of the other buttons, 78

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this one that looks like the override for PC, etc. 79

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If you click on Default and change the maximum size to 4096, 80

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That means that it will allow that size of image in our game, and 81

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it won't try to compress it when we import our asset into our Unity build. 82

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So if I click, whoops, [LAUGH] I clicked Revert. 83

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If I click the right size and Apply, by default, 84

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then when we have a look at it, it's 3765x1116. 85

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Now we can go ahead and click on our Sprite editor, 86

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and you see all this stuff in here. 87

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I know, from doing my calculation already, that when I do my cell size, it's going to 88

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be similar to previously, with the Lizard, 251x186, and then slice that up. 89

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Check on that, looks like we've got it correct, good. 90

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And then click Apply. 91

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All right, now we've sliced up our Sprite sheet. 92

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You might say, well, do we wanna not have such big Sprite sheets in our game? 93

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Yes, if you're making a mobile game in particular, 94

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you might wanna try to limit the size. 95

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We don't really need what's that, 15x6 animations of the guy eating. 96

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It's way too many animations, but we're kind of constrained by 97

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the assets that we've got from this asset pack, so we'll deal with it. 98

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But what's going on here is Unity when you build your game, 99

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when you export it as a PC build, or as a web build, or as a Android build. 100

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Then it will apply compression so that raw file that I was looking at before, 101

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where is it, this raw file here won't end up being, I think this was 16 megabytes. 102

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Pull this up, yeah, 16 megabytes. 103

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It'll be smaller in whatever the game package 104

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is that's exported because Unity is doing its own compression. 105

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Okay, now what do we need to do. 106

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Well we need to have a new animation. 107

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So let's click on our Lizard. 108

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Go to Animation. 109

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And where it says Lizard Jump, Create New Click. 110

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Save this in Assets Animations, Attackers. 111

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This will be Lizard Attack when the lizards attack, okay. 112

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Now, what do we wanna have in here? 113

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Well we need to click on our lizard? 114

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Yes, Add Property. 115

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Find the Body. 116

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Done this a few times now. 117

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Sprite Renderer, all the way down to Sprite, click on plus. 118

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That'll bring in a couple of Sprites. 119

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I'm gonna go to my Lizard Attacking Sprites. 120

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So they're being cut up, all 88 of them, which is a little bit excessive. 121

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Generally I recommend not bothering with 88, but 122

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we'll deal with what we've been given. 123

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Drag those over in. 124

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Okay, that all should be pretty good. 125

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Click on Play. 126

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Munch, munch, munch, munch. 127

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Munch, munch, munch, munch. 128

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All right, it looks cool, looks cool indeed, and change it to 24 frames so 129

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we got the right speed. 130

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Yeah, nom, nom, nom, nom. 131

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Okay, nom noms! 132

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Good, we got our nom nom attack. 133

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Is that an attack? 134

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The attack of the nom noms, I'm sure someone out there has heard of a game that 135

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has a nom nom attacking it somewhere. 136

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Okay, I hit Save cuz I haven't saved for a while. 137

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Go to Animation, I run down to Animator, 138

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you can see Lizard Attack has been dropped in there. 139

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Let me give ourselves a little bit of space. 140

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Now, we need to be transitioning from Walk to Attack, and Attack to Walk. 141

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We don't need to be transitioning from Jump to Attack, because we're not going to 142

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allow the lizard to be attacking anything until it's totally entered the scene and 143

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finished its jump. 144

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So click on Lizard Walk, right-click Make Transition to Lizard Attack. 145

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Lizard Attack, right-click Make Transition to Lizard Walk. 146

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We'll click on over in parameters, we need to add a new parameter 147

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which will be a ball, and the ball will be called is attacking. 148

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Great stuff, click click. 149

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Lets just test that out with the guy we've got now seen, 150

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once he's finished doing his jump. 151

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Jump, now if I click on Attacking, he's attacking, yep. 152

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Starting and stopping. 153

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Okay, cool. And 154

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the problem is he's still moving across the screen. 155

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What do we need to do there? 156

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Little mini challenge for you. 157

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How do we stop him sliding across the screen? 158

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Okay, the way we do that is we find the attack animation. 159

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We put in a event right at the very very start. 160

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Click on our Event button there, Add Event. 161

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And in our Function, we select SetMovementSpeed, and set that to 0. 162

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Now, when we click on our Animator, click on Play. 163

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We've got our little checkbox we can click isAttacking on and off. 164

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Attacking, he stops, turn off isAttacking, [SOUND] okay, and 165

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what's happening here is another test for you. 166

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Why is he staying in his lizard attack. 167

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It's because we're not setting, 168

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where are we in here in our lizard attack transition. 169

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We have Exit Time ticked on, so we tick Exit Time off. 170

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On here I'm going to transition to 0, just cuz I like to do that. 171

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And then transition is 0, and has Exit Time off. 172

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So the moment the transition happens, 173

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we want it to go into the other animation state. 174

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It's good to do these things when you can still just tick your box on and off, 175

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cuz if you have to wait until you've got your code written, sometimes it's a bit of 176

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a pain to figure out is that my code or is that the way I've set up my animator? 177

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Okay, so he's not stopping at all, 178

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that is because I've broken something, my transition here, okay, so, 179

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my tick box some of you have been probably yelling at me Rick, you're an idiot. 180

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I am an idiot. 181

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I've been ticking the box, 182

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it hasn't actually been doing anything because I hadn't put my conditions in yet. 183

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It was just going from Walk, to Attack, and then back to Walk. 184

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And I thought, I made one of those, I'm pushing the button, and 185

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[LAUGH] it's working, it wasn't. 186

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Okay, so let's add our conditions on the transition from Walk to Attack. 187

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It'd be isAttacking is true, that's correct. 188

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Now, on the other way around, it's gonna be isAttacking is false. 189

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So I was clicking the little + button there, 190

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isAttacking populated automatically, and then changing it from true to false. 191

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Now, unless I've done some other dumb thing, which is quite possible. 192

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Let me click the box, bump, stops, and eats. 193

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There we go, golden, okay. 194

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So we've got the behavior that we want, nom, nom, nom, nom. 195

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And now we're ready for him to do what? 196

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We're ready for him to have that code, so let's click on Lizard. 197

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Just make sure everything's applied back in the prefab. 198

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We'll go open a script, which script should we open up? 199

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We'll open up the Attacker script. 200

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We'll start by creating a variable which will be the current target, so 201

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I'll make it a game object for now. 202

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We might make it a defender in the future, but 203

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we'll make a GameObject called this currentTarget. 204

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So this is who you're targeting, 205

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only one at a time in our particular game at the moment. 206

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And now we can scroll all the way down to the bottom of our script underneath 207

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SetMovementSpeed. 208

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We'll make ourselves a public method, public void, and we'll call this Attack. 209

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And in Attack we need to know who we are attacking. 210

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So we're going to ask for a GameObject and we'll call it target. 211

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And the moment we are attacking, 212

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what we want to do is set our animator to attacking. 213

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So here's another mini challenge for you. 214

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Go ahead and write the line that will set our animation to being attacking. 215

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Might need to go have a look at some of our other code, but 216

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there's a little mini challenge for you. 217

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Okay, first of all we need to get the animator. 218

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So GetComponent, Animator, and what we'll do, 219

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what we'll SetBool and we'll SetBool to be what, isAttacking. 220

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Now I made a big mess up last time on this, let's go to isAttacking. 221

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And highlight it, copy, back over into here, paste. 222

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That actually did get it correct, but you never know. 223

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And we'll say that will now be true. 224

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And then we also need to set whatever we've just parsed in when this called, 225

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when attack is called, we parsed in the target. 226

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So now we'll say that our currentTarget = what, equals target. 227

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There we go. 228

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Now, we need to have the moment where we call out attack. 229

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And to do that we'll create ourselves a new script. 230

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And I said before we'll have a script for every particular attacker. 231

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Say now, scripts folder, right click. 232

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Create C# Script, I'll call this Lizard. 233

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Let's open up Lizard. 234

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Gonna get rid of Start and Update, I don't think I'm gonna need those. 235

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What we do need is an OnTrigger into 2D, so void OnTrigger, enter 2D. 236

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And just to be really clear instead of calling it collision, 237

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I'm gonna call it otherCollider. 238

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otherCollider, or 239

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the thing we collided with's collider is basically what this is in here. 240

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And then we'll create ourselves a GameObject that we'll call otherObject, 241

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the other thing that we've bumped into just now. 242

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And that will equal the otherCollider.gameObject. 243

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Okay, just establishing that we have this game object. 244

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So we're taking it from just being, I know about the collider of an object, 245

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to be being I now about the game object I've just bumped into. 246

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Now, I want to write an if statement. 247

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Where I'm looking to see if it's a defender, and if it is an attack. 248

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And this is where I've got a challenge for you. 249

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That challenge is finish our collision event. 250

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So, I've written this in my, this is a pretty bright green, isn't it? 251

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Okay, in my little pseudo comment code here. 252

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If the other object has a defender component, 253

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then call our public attack method we just created. 254

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So there's a little if statement I'd like for you to take on and write. 255

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So give it your best shot and I'll see you back here when you're done. 256

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Okay, so if otherObject, that we've just created, otherObject.GetComponent. 257

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And what sort of component does it need to have? 258

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It needs to have a Defender component. 259

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We wanna know, are you a defender? 260

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If not, we are not interested, but if you do have a defender component, 261

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that means you're worthy of being attacked, then we wanna get my object, so 262

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my lizard object's attacker script. 263

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So GetComponent, because that belongs to me as a game object, so 264

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I have a component which is Attacker. 265

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And then on that we call the attack script, sorry the attack method. 266

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And the attack will attack what, otherObject. 267

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It's a little bit tricky but basically we are bumping into something, 268

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we're saying it's a game object, does it have a defender script and then now we 269

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know from this point on that this is the thing we're attacking, this otherObject. 270

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So let's see how this work. 271

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Save that up. 272

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Jump back over into Unity. 273

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Now click on Lizard. 274

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Remember or remembering, I've just spent the last five minutes wondering why my 275

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code hasn't work and I've just edited that piece out, is I've forgotten to add my 276

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Lizard component to my Lizard, which is what we should do now. 277

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So add lizard, apply that to the prefab so 278

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it actually knows the code that we've created. 279

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It knows about it. 280

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And then, well I'm here I'm gonna click on isTrigger as well, and 281

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the box Collider for the lizard, click on Apply. 282

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Click Play, and then I think it's gonna be the tombstone that's gonna work the best 283

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for this, cuz currently we've tuned our cactus, 284

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and our gnome to completely smash things as they come along. 285

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So he stops and starts nibbling on it, that's great, nom, nom, nom, nom. 286

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And we'll see if we can get it as well with a cactus, and there we go yeah. 287

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So they're now stopping, they're attacking, we don't have the proper 288

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health component setup just yet so they're gonna stand there forever attacking. 289

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But they're now switching into their transition state based upon 290

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our animation trigger. 291

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So great work, you can probably tune your colliders a little bit so 292

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it's a little bit tighter, so it looks like they're actually nibbling on things. 293

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So great stuff and I'll see you in the next video.