WEBVTT 00:00.630 --> 00:10.550 So I stole this from this kind of classic gaming sites that had sort of the description of Space Invaders 00:10.550 --> 00:12.530 and go to the site if you want. 00:12.530 --> 00:14.480 It's got lots of interesting stuff about it. 00:14.540 --> 00:16.150 But the game in general. 00:16.940 --> 00:23.900 So it starts so the object of the game is to shoot the invaders with your missile base while avoiding 00:24.080 --> 00:26.850 their shots and preventing invasion. 00:26.940 --> 00:34.280 Ok massing a high score is a further objective and one that must be prioritize against your continued 00:34.280 --> 00:35.710 survival. 00:35.780 --> 00:46.490 Each game screen starts with five rows of 11 invaders the bottom two rows score 10 points or her large 00:46.490 --> 00:47.030 invader. 00:47.030 --> 00:56.120 The middle two rows are 20 points for the medium the beer and the top rows scores 30 points for each 00:56.120 --> 00:57.420 small innovators. 00:57.770 --> 01:00.150 Ours will be all the same size. 01:00.180 --> 01:03.910 Don't worry the big meeting in small here. 01:04.070 --> 01:08.570 This makes each screen worth a total of nine hundred ninety points. 01:08.640 --> 01:16.440 The score for each screen can be dramatically increased by the destruction of the mystery value spaceship. 01:16.440 --> 01:27.460 When I call the UFO that frequently flies from one side of the screen to the other mystery UFO should 01:27.460 --> 01:34.170 have points value of 50 to 200 points temporary sanctuary. 01:34.280 --> 01:42.980 Can you SOP's beneath the four Bs shields shields are destructible by both the player and the aliens. 01:43.000 --> 01:46.920 Only the part of the shield hit by either player. 01:47.210 --> 01:53.100 You are either a player missile or an alien bomb should be destroyed not the entire issue. 01:53.260 --> 01:56.520 So like parts of the shield can be kind of broken. 01:56.530 --> 01:58.260 It's what's saying here. 01:58.510 --> 02:07.050 Invader's travel sideways and each time they touch the side they drop down one line on the screen and 02:07.270 --> 02:16.590 when one day they need to drop 11 lines at each to reach the bottom to invade from screen 2 through 02:16.590 --> 02:17.540 9. 02:17.550 --> 02:24.460 They start progressively lower down on the screen so this is this is actually talking about the games. 02:24.840 --> 02:32.190 So if you actually won the game the next time they spawn because you just kind of keep going. 02:32.190 --> 02:35.820 They start one mind lower than they did before. 02:35.940 --> 02:44.810 OK screen 10 the game reverts to the screen 1 a start position and the cycle begins again. 02:45.920 --> 02:53.330 So again essentially what happens is they start kind of the highest on the first on the first try. 02:53.550 --> 03:02.580 And if you destroy them all and then kind of that will sort of restart the game then they'll start one 03:02.580 --> 03:11.570 line lower until they reach 10 and then they kind of recycle back to the first first time. 03:11.820 --> 03:18.100 There is no time limit except for the fact that if you do not shoot them all before they reach the bottom 03:18.160 --> 03:21.520 the bottom of the screen the game ends. 03:22.030 --> 03:24.930 So the more invaders the player shoots the faster. 03:25.000 --> 03:30.920 Maybe aliens move when the invaders are low enough to touch the base shelters. 03:30.950 --> 03:33.610 They erased them as they pass. 03:33.740 --> 03:34.870 That's very important. 03:34.870 --> 03:35.660 OK. 03:35.900 --> 03:42.220 And the last invader Missouri quickly or us any missiles drop by. 03:42.300 --> 03:44.960 She's interested say bombs. 03:45.530 --> 03:52.750 Bombs dropped by the invader on the row above invasion row will not harm the players missile. 03:52.790 --> 03:53.460 So. 03:53.660 --> 04:02.320 So Alien bombs and players missile can't collide other words the aliens can have a maximum of three 04:02.320 --> 04:07.880 bombs on the street in that time the player can only have one missile shots on the screen at one time. 04:08.320 --> 04:14.440 If the player is hit the game should pause and the player should be showing the exploding animation 04:14.530 --> 04:18.870 so the player can get hit in the head explode. 04:19.030 --> 04:29.370 And what we'll do is you'll have to press a button or a key to continue the game if an alien is hit 04:29.430 --> 04:33.170 they should explode for a short time then disappear. 04:33.770 --> 04:37.300 There should be an intro screen game over screen. 04:37.320 --> 04:43.500 The player can enter their name in high Group high score screen so there's different screens to this 04:43.500 --> 04:44.500 game. 04:44.550 --> 04:49.990 It's quite a bit more complicated than say battleship for example. 04:50.140 --> 04:55.860 It should be a high score table that can be seen from the initial welcome screen and after the game 04:55.860 --> 04:57.330 is over. 04:59.160 --> 05:05.500 And the player enters his three letter name so it will show up after they kind of enter their name. 05:05.580 --> 05:09.230 See what score the. 05:09.470 --> 05:16.730 So all the regular aliens are two by four in terms of size two rows four columns. 05:16.730 --> 05:18.870 Player is two by five. 05:18.920 --> 05:26.990 And the alien ufo is two by six and you can see all the sprites are actually going to be drawing sprites. 05:26.990 --> 05:30.740 So you can see all the sprites here of what everything is going to look like. 05:30.740 --> 05:37.470 You can change the sprites however you like but easier are the ones I'm going to use. 05:37.540 --> 05:38.270 OK. 05:38.480 --> 05:41.390 And notice that there they have animations. 05:41.420 --> 05:46.030 There's ones prayed for this thirty point alien will look like this. 05:46.130 --> 05:50.680 Maybe the initial spray will like this and then when he moves he'll kind of like this. 05:50.960 --> 05:57.210 And similarly for these aliens OK the UFO doesn't change at all. 05:57.540 --> 05:58.470 And the players. 05:58.610 --> 06:04.600 In actual game play doesn't change but the explosion will actually have an animation. 06:04.940 --> 06:07.770 OK and here's what the shields will look like. 06:07.800 --> 06:09.830 Here's what the alien bomb will look like. 06:09.830 --> 06:15.220 So the alien bomb is also animating things so that's important. 06:16.210 --> 06:18.160 So go from this list. 06:18.340 --> 06:25.720 And then back here and make that and the alien explosion just like this. 06:25.720 --> 06:28.930 We could change it to be the same size as well. 06:28.930 --> 06:33.940 If you want to look at if you want to look like this that is all you want. 06:34.480 --> 06:39.130 It doesn't matter too much and that's it. 06:39.130 --> 06:47.230 So what can we start understanding about what kind of data we want. 06:47.740 --> 06:50.320 So let's take a look. 06:50.320 --> 06:52.270 So when you're a player 06:57.050 --> 06:58.220 so. 06:59.310 --> 07:01.090 You're. 07:01.180 --> 07:05.020 Only some humans need the shields 07:08.170 --> 07:10.500 any kind of alien bombs 07:13.820 --> 07:15.680 player missiles. 07:21.790 --> 07:31.350 They all need sort of states that the game can be in. 07:31.350 --> 07:44.510 So games it's because for example says here there's intro screen of Game Over screen high score screen 07:44.710 --> 07:48.540 as well as many different states that the game will be in. 07:49.890 --> 07:59.450 That will need to to figure out the scores on the score and a high score table. 08:04.530 --> 08:04.790 OK. 08:04.930 --> 08:07.670 So these are just kind of general observations. 08:07.840 --> 08:23.310 Sensage general data maybe they Here's all the general data that I kind of glean from this description. 08:23.310 --> 08:27.660 So let's kind of break it down. 08:27.900 --> 08:30.870 So let's start with the player 08:36.910 --> 08:44.030 so where will have what each a position 08:46.970 --> 08:49.460 it'll have. 08:49.680 --> 08:56.230 It only has one missile and the player can only have one missile shot on screen and when times are going 08:56.230 --> 09:08.770 to give it to where a missile has animations state Guess what if they're so usually it doesn't have 09:08.770 --> 09:10.300 animations to eat. 09:10.480 --> 09:13.590 But what if it got hit and it's exploding. 09:13.590 --> 09:24.030 No it will have to kind of go between these two animations and this animation state it has the size 09:24.030 --> 09:26.040 of the Spryte 09:32.720 --> 09:36.000 it has. 09:36.500 --> 09:39.140 It didn't actually say up here. 09:40.650 --> 09:47.120 It just kind of a weird sort of added a couple things to this description but I didn't add that it had 09:47.260 --> 09:50.720 we have lives. 09:50.950 --> 09:55.240 In fact we have three lives OK. 09:55.610 --> 09:58.010 And then it's game over. 09:58.610 --> 10:01.450 And the player also has a score as well. 10:02.340 --> 10:06.780 So how many points he currently has. 10:06.870 --> 10:11.490 So that's kind of the major stuff player. 10:11.490 --> 10:14.040 So what about the aliens. 10:14.100 --> 10:26.310 So I'm going to break up the aliens into kind of the regular ten twenty thirty point aliens and just 10:26.790 --> 10:29.820 distinguish them from the mystery UFO. 10:29.930 --> 10:40.320 And so I'm going to call the regular aliens the aliens swarm. 10:40.570 --> 11:00.120 And so this is the actual This isn't an individual it's actually all all the 10 20 and 30 point aliens. 11:00.130 --> 11:03.350 So as one kind of unit 11:06.100 --> 11:14.900 the aliens swarm in general has a position. 11:15.950 --> 11:20.180 They have a direction that they're kind of moving in. 11:20.210 --> 11:26.080 So either left or right. 11:29.380 --> 11:40.520 They also have animations which animations state they're in because when they move they change their 11:40.530 --> 11:42.920 animation for your scene. 11:43.020 --> 11:47.470 Space Invaders played a. 11:47.540 --> 11:58.090 They also have size of each alien. 11:58.170 --> 12:00.090 They have a state that they're in. 12:00.170 --> 12:00.870 So 12:03.440 --> 12:08.200 they really only have three states alive. 12:08.400 --> 12:20.120 Dead or exploding because they have to explode for a while says somewhere around here. 12:20.700 --> 12:21.710 Feelings hit. 12:21.730 --> 12:25.110 They should explode for a short period of time then disappear. 12:25.930 --> 12:32.030 So they'll have kind of an exploding state as it were. 12:32.370 --> 12:35.700 And of course they have alien bombs. 12:41.590 --> 12:44.830 And notice I'm not giving them points here. 12:44.850 --> 12:45.330 Right. 12:46.750 --> 12:49.670 All kind of deal with that some other way. 12:52.050 --> 13:04.480 Rosca have the feeling you know and that we actually have eyes for this bright and the actual position 13:04.480 --> 13:19.620 that they're in and points that they that it's worth game which is random from 50 so it can have a value 13:19.620 --> 13:22.570 of 50 to 100 200 points. 13:23.540 --> 13:32.520 So it's that we miss or we miss the actual shields. 13:32.960 --> 13:35.500 Right here. 13:35.530 --> 13:38.670 So that's actually that's it for you. 13:38.810 --> 13:49.960 Well so the shield itself will have a Spryte and notice that these don't like this doesn't have a sprite. 13:49.970 --> 13:51.460 This doesn't have a spray. 13:51.470 --> 13:54.370 This doesn't have a sprite currently. 13:54.740 --> 13:56.000 But this will have a sprites. 13:56.000 --> 14:07.490 And the reason why is because the spray can change. 14:07.670 --> 14:14.510 Unlike the aliens which doesn't really change the only change in terms of animation which we already 14:16.280 --> 14:18.180 factored in to ours. 14:18.350 --> 14:25.840 And similarly with the glare the player doesn't really change he just has a animation state if he's 14:25.910 --> 14:34.680 exploding but the shield itself will have an actual sprite because the Spryte say the middle seat sprite 14:34.760 --> 14:35.120 say. 14:35.120 --> 14:41.020 This one got steroid so it could look like this if it got hit in the middle right. 14:43.150 --> 14:45.440 So that's important to capture. 14:45.820 --> 14:51.000 So have a sprites and they'll all have position 14:55.330 --> 14:56.230 so 14:58.950 --> 15:01.620 we'll also have let's say a position 15:08.060 --> 15:15.110 in those that position really just has it's just an x y coordinates. 15:20.450 --> 15:22.040 The alien bomb 15:26.570 --> 15:28.610 will also have a position 15:31.050 --> 15:33.660 and it will have the 15:37.920 --> 15:43.200 the animation state could be of four different states. 15:43.230 --> 15:45.850 Could be like this. 15:46.080 --> 15:49.180 This this this. 15:49.410 --> 15:57.970 That's four states it could be in kind of similarly sort of the missile that we have for the player 15:59.160 --> 16:01.050 right. 16:01.320 --> 16:06.440 So call it missile really is just a position. 16:06.460 --> 16:07.070 So 16:10.710 --> 16:15.160 that's kind of it's in the Spryte will use for it. 16:16.390 --> 16:23.110 It's kind of an aside. 16:23.240 --> 16:27.100 It will just be kind of a vertical line like this. 16:28.040 --> 16:31.080 So again this won't change. 16:31.280 --> 16:36.740 Therefore we don't need an animation stage and we don't need to set the sprite in here because it will 16:36.740 --> 16:42.710 change all day kind of more subtly. 16:42.880 --> 16:47.620 The we said we need game states right. 16:47.660 --> 16:53.530 So maybe we actually need kind of a game structure as well. 16:54.350 --> 16:58.320 So we actually have the game stee in here. 17:01.530 --> 17:06.030 Maybe that current level that we're on like it said above 17:12.310 --> 17:23.760 is it's so onscreen one they need to drop all of minds right so screen to really there should be level 17:23.770 --> 17:29.120 1 and level 2. 17:29.300 --> 17:43.620 So we're going to have that level here and we're going to have the size of the window in the game as 17:43.620 --> 17:44.220 well. 17:47.550 --> 17:52.440 There's going to be extra stuff that we're not think of right now but again we're just sort of thinking 17:52.440 --> 18:00.360 in terms of what we may need just based off the description and all the sprites that we have. 18:00.360 --> 18:06.240 So we're kind of thinking out loud and sort of doing the best we can with what you know. 18:06.240 --> 18:13.680 For now often when you're in the game you'll have to make revisions and do different maybe maybe add 18:13.680 --> 18:16.570 some more data that you of missed. 18:16.650 --> 18:22.590 So but usually when you kind of go through it the first time you should really just do what we're doing 18:22.590 --> 18:28.440 right now and sort of think about all the things we're going to need logically. 18:28.940 --> 18:31.800 And if you have to make changes to it later that's OK. 18:33.230 --> 18:35.050 So we have scores. 18:35.300 --> 18:44.800 Obviously it's just going to score value and it said we could enter a name so maybe a name is all. 18:45.350 --> 18:47.780 And so the high score table 18:54.750 --> 19:00.810 as well which I think is going to make vector school is gay 19:04.090 --> 19:08.530 so if there's anything really missing 19:13.170 --> 19:21.510 in terms of kind of the broad overview of the actual data for the game but I'm sure there'll be some 19:21.510 --> 19:27.470 things that we need to add or change over the course of doing this game. 19:27.600 --> 19:28.490 OK. 19:28.500 --> 19:36.270 So I want to in the next lecture go over the actual implementation of the data so making all the strokes 19:36.780 --> 19:39.760 and kind of thinking about everything we're going to need. 19:39.920 --> 19:43.050 And so I will see you in the next lecture.