Original subtitles

1 1

[MUSIC] 2

2

In this video we're implementing score for our games so 3

3

that when we shoot enemies our score goes up, up, up. 4

4

And then when we die we have that same score presented on our game over screen. 5

5

So what I wanna do is start off with a challenge in this video and 6

6

the challenge is to add score to your game. 7

7

Killing enemies increases your score. 8

8

And I wanna give you a reminder of what's required by showing you what 9

9

I've just gone and implemented. 10

10

I've come back in the future, back to the future, back from the past. 11

11

Anyway, I've just recorded it, and I'm recording the start of the video now. 12

12

I wanna show you what I've done so 13

13

that if you want some reminders you know what's going on. 14

14

I've created a game session game object out of the game session script of that. 15

15

Within the game session script I'm doing a couple of things, 16

16

I'm creating a singleton pattern, I'm creating a score variable and 17

17

then three public methods to GetScore, to AddToScore and to ResetGame. 18

18

I'm showing you these very quickly, 19

19

I'm going to go through them in super detail in a moment. 20

20

But I'm showing you if you wanna go and do this challenge yourself, 21

21

I'm also creating a score display which is getting the text component that our score. 22

22

So main canvas that our score text is on as well as the game object of game 23

23

session To be out of called the public method of getting the score. 24

24

And then we are updating on every frame, the score by using the ToString method. 25

25

Finally, when we kill an enemy, we need to have a score value and when we die, 26

26

when the enemy dies, we are calling the AddToScore and passing in scoreValue. 27

27

So that's just a really quick rundown, if you wanted to go and 28

28

do this as a challenge yourself and have some reminders and pointers, 29

29

that is the challenge. 30

30

So jump in, take on that challenge now, give it your best shot. 31

31

And I'll see you here when you're done, we'll go through it together in detail. 32

32

Okay, let's get shifty. 33

33

First thing I'm gonna do is free up a little bit of space in my hierarchy, 34

34

right click Create Empty. 35

35

I'm gonna call this Game Elements, and I'm just gonna shove anything in here that I 36

36

don't need have a look at reset that transform. 37

37

So I'm gonna grab the background star field, star field, shredder shredder. 38

38

Drop those into the game elements, the path and the other path, 39

39

drop those in there. 40

40

That's pretty good, and then just close up game elements, 41

41

drag it up to the very top so it's tucked neatly out of the way. 42

42

Excellent, next I'm gonna right click and Create Empty, create a game session. 43

43

Game session, game object. 44

44

Within the Game Session game object, we're going to create ourselves a script. 45

45

Which I will click on my script folder, right click, click C# script. 46

46

I'm gonna call this, you guessed it, GameSession. 47

47

Okay, and then drag the GameSession script onto, 48

48

when it finishes figuring out that it's alive, okay you are alive, 49

49

great, the game session, script under the Game Session game object. 50

50

And then while we're here for due diligence, 51

51

drag the Game Session game object into our prefers folder so it is now prefer core. 52

52

You might have noticed that my assets folder here has changed a little bit. 53

53

I've just gone and drag my slider from folders down in to lists, 54

54

because that's making it a little bit neater and tidier to see what's going on. 55

55

Okay, we're going to need one more script in this video. 56

56

So script folder, right click, create c sharp. 57

57

I'm gonna call this particular script ScoreDisplay so 58

58

that we can be displaying our score. 59

59

So this is our script building block. 60

60

So next stop I'm gonna add my score UI element to the screen. 61

61

So find the game canvas, right click create a UI text. 62

62

Now, we could do TextMeshPro-Text we could do text we tend to do a lot 63

63

of TextMeshPro, 64

64

cuz I think it gives us a little bit more control looks a little bit crisper. 65

65

But in this video I'm gonna be doing score using just tick so that we've done the way 66

66

so you can see it is wanting to do text you know how to do text. 67

67

So were covering a few different bases, 68

68

but in general you'd probably just do one or the other. 69

69

Okay our text we'll rename to be score text and 70

70

then let's see click, if you click on your game canvas, 71

71

that'll zoom you can see score text on your screen. 72

72

So right size is tiny at the moment. 73

73

So let's click on Score Text, change our font to 100. 74

74

Change the color to be, for now, white until I have a better idea. 75

75

Change from the New Text in the text field to 000000, that's kind of six 0s I think. 76

76

And then w, whoops, not a w there! 77

77

Click on Score Text. 78

78

W tall move it roughly up to the top right of my screen. 79

79

I need to zoom in a little bit. 80

80

I'm gonna click on my T-tool. 81

81

And make it bigger so we can actually see it. 82

82

There it goes, it pops into existence, make it nice and large. 83

83

Right click or right align and I like to center line things. 84

84

Now, change the font so font, select that, whatever you've selected for your game, 85

85

I've got batman FA just here, looks pretty crisp over there, 86

86

I like it gonna move it up just a little bit more and very important, 87

87

click on the anchor and then right click on the anchor. 88

88

So no matter whatever screen resolution and aspect ratio we have our score, 89

89

we anchored up to the top right of your screen. 90

90

Okay, now we have score, it called Score Text, perfect, 91

91

that all looking pretty good. 92

92

Our script we just made, which was the ScoreDisplay. 93

93

We're gonna drag that over onto score. 94

94

Excellent, or you can add component and search for it, either of those ways. 95

95

Now we have our score display on our score. 96

96

Our last thing we're gonna do is change the color just to make it a little bit 97

97

more of a bright blue spacey, fluorescent kind of, there we go, wonderful. 98

98

Okay, so I've got score, 99

99

I've got my scripts, we're ready to jump into the scripts. 100

100

Find our game session, double click on that, open it up, jump into Visual Studio. 101

101

First thing I need to do is create a notion of score. 102

102

So score a little s, score initialize that 0; so you have your score. 103

103

Next, I'm gonna implement a singleton, so that our game session there is only one of 104

104

them and we can reuse our score in our game overscreen because it's a singleton. 105

105

So I'm gonna create Awake, so it's the very very first thing it does 106

106

when it wakes up it will SetUpSingleton(); as a method, 107

107

right click on SetUpSingleton quick actions and refactors generate method or 108

108

you can just type it out yourself if you like typing. 109

109

And then, I'm gonna delete the default line that's in there. 110

110

What do we need to do? 111

111

Well, we need the integer, which is how many game sessions we have already. 112

112

So int numberGameSessions and what does that equal? 113

113

Well, we need to find how many sessions there are. 114

114

So I say FindObjectsOfType and again, I'm gonna do the s a few different times. 115

115

So you're like, there's an s in there, don't forget that. 116

116

That's the most common thing, if this line of code's not going well, 117

117

it's cuz we've forgotten the s. 118

118

It's game objects of type. 119

119

We're looking for GameSession(). 120

120

How do we know how long it is? 121

121

Well, we type in length, okay? 122

122

Now we need to do our if, so 123

123

if (numberGameSessions > 1) curly 124

124

brace space we will Destroy(gameObject); 125

125

else DontDestroyOnLoad(gameObject);. 126

126

Save that looking good except we don't have our colored braces. 127

127

Being a little bit hasty here, 128

128

curly braces that wrap around our code block of DontdestroyOnLoad. 129

129

Okay, that's looking pretty good, 130

130

we've got our single term we're running it on Awake. 131

131

We're calling it on Awake. 132

132

Next up we want to add three public 133

133

methods that we can call from other scripts or other areas and 134

134

we get rid of start, don't need that, also don't need update so clear those out. 135

135

Public method number one is gonna be for getting the score, so 136

136

public int GetScore(). 137

137

Why is it an int I ask you? 138

138

It's an int because we have to return a value, and that value is score, and 139

139

the score is an int, so whenever we call that it will return score which is an int. 140

140

Next public method, public, this will be void, there's no return type. 141

141

We'll call this AddToScore, this is where another class or another moment in 142

142

our game can say, hey, game session, please add something to the score. 143

143

What's the something? 144

144

Well we need to know how many points to add to the score. 145

145

This is where we'll have a requirement in here, we'll have a parameter. 146

146

Which we will make it an int, and we'll look for a score value. 147

147

So if you want to call AddToScore, 148

148

you need to tell me the score value that I'm adding. 149

149

And then within our method, within our code block here we take out current score 150

150

+=, what's it gonna plus equals? 151

151

It's gonna plus equal ScoreValue, so it is taking our current score and 152

152

then adding to it, 153

153

where the scoreValue is that was passed to us by the thing that called add to score. 154

154

We will make one more Public Method while we are here. 155

155

Public V=void ResetGame() and then {. 156

156

What are we doing here? 157

157

Well this is just simply destroying this game session objects. 158

158

So, Destroy(gameObject);. 159

159

Okay, so there's game session all created, looking pretty good, 160

160

no functionality we can see in the game just yet but that is pretty tight. 161

161

Next up we need to find our score text and specifically our score display. 162

162

So we've already opened that I believe, 163

163

score display here we go just nice and empty. 164

164

We're working in UI so we want to start off by 165

165

adding a namespace using UnityEngine.UI. 166

166

And remember if you are using TextMeshPro instead of just the text component, 167

167

you'll need to add the TextMesh Pro namespace in here or 168

168

else things won't go as you're expecting them. 169

169

Now, what do we need to do in our score display? 170

170

First of all, we need to get the component where we want to display the score. 171

171

So if you have a look on your text, 172

172

score text, we have the text component just in here. 173

173

So we need to get this, and then within that we have the text field. 174

174

So there's a lot of texts, I know we've dealt with this in previous sections, 175

175

text.text.text it feels like there's 70 text, but this is the text component and 176

176

this is the text value of the text field that is within that. 177

177

So to get access to that text component we start off by creating ourselves a variable 178

178

to store that in which will be a text type variable called scoreText;. 179

179

And in the scoreText;. 180

180

And then when we start our game, we need to give scoreText a value, 181

181

which is going to be the component. 182

182

So GetComponent<Text>();. 183

183

Okay, so get the component text stored as this scoreText variable, 184

184

which we've declared as a type of text, excellent. 185

185

Next, we need to do similar for finding where the score is coming from and 186

186

we know the score is going to be stored in game session. 187

187

So let's create a type GameSession. 188

188

We'll call this gameSession with a small g, semi-colon. 189

189

Now also on the start when our score display comes into existence, 190

190

we need to go and find the game session. 191

191

So we need to define gameSession that we've just created as a variable as, well, 192

192

we need to define it as this gameSession class. 193

193

So that's a type, we need to 194

194

FindObjectOfType <GameSession>();. 195

195

So we've gone and got ourselves a reference to the component, 196

196

and we've gone and got ourselves a reference to the GameSession. 197

197

Now on update, all we need to do is to say 198

198

scoreText.text=gameSession. 199

199

What's our method that we've created in game session, we're looking for 200

200

get score because we need to know the score so gamesession.GetScore(). 201

201

And then we need to be converting this into a string because we 202

202

have an integer at the moment. 203

203

The score itself is a integer and our text field is a string. 204

204

So to convert out integer into a string we say ToString();. 205

205

Sets are looking pretty good, let's jump over to Unity, 206

206

see if we've got any sort of different behavior going on. 207

207

We should have, yes, it goes from allow placeholder zeros to just one zero. 208

208

And then no score going up, but so far, so good. 209

209

Okay, so how do we make our score go up? 210

210

Where is it happening that our score should go up? 211

211

Well, at the moment, we've only got enemies in our game, that's, 212

212

we shoot them, we get points. 213

213

So let's go on find out enemy script, without enemy script we need to start off 214

214

by creating a concept that the enemies give us points. 215

215

And I've been putting this off for awhile but I can't put it off any longer. 216

216

Let's tidy up our variables so it's tidy in our inspector and 217

217

tidy in our script cause this is a big old blob of stuff. 218

218

So I'm gonna create a [Header("")]. 219

219

What are we gonna say in here. 220

220

Well, first up we've got enemy stats, this looks like. 221

221

We've got some enemy stats. 222

222

I'm gonna go and create a new enemy stat which will be 223

223

SerializeField of integer type that I will call scoreValue. 224

224

That'll be the scoreValue of this particular enemy, and 225

225

that will equal 150;. 226

226

Cool, next up, let's see, copy my header code and then paste 227

227

that above the next blob of code this blob of code is all about shooting, I believe. 228

228

Shooting, we have counter shot projectile, projectile. 229

229

Okay, after my last projectile, a couple of spaces. 230

230

Paste in our header again. 231

231

What are these all about? 232

232

This is all about sound effects. 233

233

Sound effects. 234

234

Okay, so much tardier. 235

235

I'm much happier with that. 236

236

Now, we've created score value. 237

237

Let's go and find where we will make our score increase. 238

238

I think when the enemy dies, that's a good place to increase the score. 239

239

So what are we doing here? 240

240

Let's just go remind ourselves over in game session, 241

241

we've got our AddToScore method. 242

242

How do we call add to score method from another script? 243

243

Well, we say FindObjectOfType, 244

244

we're looking for the GameSession(). 245

245

This is what we call our AddToScore();. 246

246

Semi-colon is not working because, can you guess why not? 247

247

Because we need to give it a value. 248

248

A reminder, over here we need the value of scoreValue, 249

249

you need to tell it how many points you're worth, you can't just let it guess. 250

250

So in here, it's gonna be nice and simple. 251

251

We have our scoreValue and we've named it the same, clever us. 252

252

ScoreValue, so back down into AddToScore. 253

253

Score value blank. 254

254

Okay, let's save all that up. 255

255

I think we have implemented everything. 256

256

Click on play. 257

257

What's gonna go on here? 258

258

We will from zero [INAUDIBLE]. 259

259

Okay, score's going up 300, 600. 260

260

Excellent, success. 261

261

But when we die we get a moment to look at the score but 262

262

there's no real moment on here where I can look at the score, call my friend over. 263

263

Hey, look, I beat your score, whatever it might be, 264

264

so let's have the score display on the screen as well. 265

265

And we've set ourselves up with our game session is a singleton, so 266

266

it will continue. 267

267

It will exist and live into the next screen, 268

268

which is very important, the next scene. 269

269

So I've prefabbed that good stuff. 270

270

The game canvas, here's a little thing. 271

271

I wasn't planning on doing this, but just spur of the moment, I think I will. 272

272

See how we currently have our game canvas prefab, and 273

273

there's only one element here the score text. 274

274

So I'll click on apply, so now our game canvas and 275

275

score text have been updated in terms of the prefab. 276

276

So if we say all this up, jump over into [SOUND] where are we, the scene. 277

277

Game Over scene. 278

278

If I find my prefab and drag the Game Canvas 279

279

into this scene, it adds it in there. 280

280

We can have multiple canvases, 281

281

you can have a whole ton of canvases doing different things. 282

282

That's something that we haven't talked about much because we've 283

283

been putting everything under the one particular canvas but 284

284

you could turn our particular canvas on and off. 285

285

You can move the canvases around. 286

286

So this game canvas, I'm gonna change the position of it, of the score text. 287

287

I'm gonna change the score text position to be, let's see in the middle just there. 288

288

So the score goes form being up in the top right, 289

289

when it's game over you get the score right in the middle of the screen. 290

290

Do a couple of things in here, I will just drag it to the right, and 291

291

drag it to the left so. 292

292

And then center align so I know it's right in the middle. 293

293

And then we need to change the anchor point, 294

294

rather than the anchor point being up in the top right. 295

295

That's gonna be a little bit messy if our resolution or our pixel, 296

296

aspect ratio changes. 297

297

Let's anchor this right into the very middle of our screen. 298

298

Okay, there might be a little bit of tidy up of anchoring our other 299

299

elements in the scene. 300

300

I'm not gonna go through that. 301

301

You know how to do that now in terms of anchoring things into a particular 302

302

position if the aspect ratio is changing, 303

303

but this is all looking pretty cool for now. 304

304

We're getting an error down the bottom, assertion failed. 305

305

I think that might have just been cuz I was playing around and 306

306

moving things around. 307

307

We'll clear it and we'll see if it comes up again and then we'll go and 308

308

dive in and see what needs to happen to fix it. 309

309

But let's go back to start, we'll go back to the very start of our game, 310

310

very start start, click on START menu. 311

311

Okay, so click on START, and then sorry, click on Play, and then START. 312

312

We will [SOUND] start our start. 313

313

Okay, score is going up, excellent, we crash into someone. 314

314

[SOUND] 1050. 315

315

Is 1050 retained? 316

316

Yes, it is, all the way here. 317

317

What happens when we play again, goes to zero, and, okay, so 318

318

our score's not going up. 319

319

Why is that? 320

320

I suspect because we are not properly resetting our level loading. 321

321

So let's have a look at our gamesession in here. 322

322

We've created ResetGame, which was clever of us, but 323

323

we're not actually calling it any way. 324

324

Where would we reset our game? 325

325

I think that's gonna be in level, isn't it? 326

326

When the player says load the game, so load the game scene, 327

327

that's where we need to reset. 328

328

So once again, how do we find this particular public method? 329

329

We will say FindObjectOfType and 330

330

it is type GameSession() and 331

331

we're calling ResetGame();. 332

332

Okay, resetting game, so save this. 333

333

I'll jump back over into Unity, click on play. 334

334

See what we can do with the full loop now if we can, 335

335

then we'll declare this success. 336

336

Click on start, shoot, shoot, shoot. 337

337

Get some points, shoot, shoot, die. 338

338

600 should be retained in here, you can put an extra 339

339

text run here saying you scored or your score is 600, if you like. 340

340

Back to main menu, click on Start, start at 0, 341

341

scores goes up and then [SOUND] back into Game Over. 342

342

One more thing we need to try play again. 343

343

Yeah, and the score does go up. 344

344

Okay, just a quick side note here, 345

345

I had a couple of errors on my screen here, I just went and cleared them, 346

346

played the game through a couple of time and the errors don't come back again. 347

347

So I forgot to mention that before I pause the video, 348

348

but I've cleared out all the errors just in case you're wondering. 349

349

So great work in this lecture, great work with your progress. 350

350

Pretty excited to see score in our game. 351

351

We can implement it in so many more places now. 352

352

We can have it when you shoot an enemy, 353

353

the enemy spawns a whole bunch of little coins that you go pick up. 354

354

Like little pickups for points. 355

355

It could be that you just have super mega point 356

356

things floating down your screen that you can pick up. 357

357

Lots of places you can do it above and beyond I just shoot an enemy and 358

358

I get points. 359

359

So great work with this lecture, great work with your progress, and 360

360

I'll see you in the next video.