WEBVTT 00:01.000 --> 00:08.770 That we have the players shooting moving and they shields as well and can climb missiles with the shields 00:08.770 --> 00:12.540 that start working on the aliens. 00:12.560 --> 00:22.560 So just like we hand with the game player and shields we're going also need to initialise the aliens. 00:22.850 --> 00:33.980 So you actually use your remember the you have a struct called Alien swarm. 00:33.990 --> 00:37.480 So we need to initialize this struct. 00:37.930 --> 00:41.730 So I actually make one swarm 00:44.360 --> 00:48.520 aliens like that. 00:49.530 --> 00:52.690 And let's actually say that. 00:55.370 --> 00:56.230 Aliens 00:58.700 --> 01:04.690 and it's going to take the games as well as the aliens. 01:07.680 --> 01:26.730 So it's clear this turn nothing in it's going to take the game like constant or fruit's and take the 01:26.790 --> 01:27.510 aliens 01:30.220 --> 01:35.970 reference. 01:36.190 --> 01:37.930 It's actually defined this 01:40.630 --> 01:44.420 and define it right after after this 01:49.820 --> 01:50.440 care. 01:50.540 --> 01:54.100 So how would we initialize the alien. 01:55.320 --> 01:59.430 So really we need to set them all to be alive. 01:59.430 --> 02:03.780 If you remember in the alien structure. 02:03.990 --> 02:13.680 We actually said we need to set all the aliens state and we'll need to give it the initial position 02:14.310 --> 02:17.530 and we'll need to use separate size. 02:17.550 --> 02:18.930 All that stuff. 02:19.440 --> 02:21.550 So it's started that. 02:21.560 --> 02:24.480 So first of all that actually set them all to be alive. 02:24.480 --> 02:33.450 So for each row row row is less than a number. 02:33.480 --> 02:34.740 Alien rose 02:37.260 --> 02:39.620 in true cost plus 02:44.800 --> 02:46.880 and remarry we'd find this four. 02:46.900 --> 02:50.480 There's five rows of aliens and 11 columns. 02:53.170 --> 02:56.990 So now let's go through each column 03:04.040 --> 03:06.240 let's remember. 03:06.300 --> 03:13.880 You mean columns plus plus. 03:14.000 --> 03:15.720 And we'll just set them all to be 03:20.850 --> 03:24.950 row column. 03:24.990 --> 03:30.890 So this is the state. 03:31.220 --> 03:33.600 Now they're all alive. 03:33.720 --> 03:38.220 What sets say the direction they're going. 03:40.550 --> 03:44.620 And let's make them go to the right first. 03:47.020 --> 03:56.070 And you have the number of aliens left. 03:56.460 --> 04:04.050 And just how many aliens there are initially. 04:04.130 --> 04:09.240 It's just the number of alien rows and the number in columns 04:14.050 --> 04:16.310 in one set of things. 04:16.340 --> 04:27.550 The animation zero for now we're not going to deal with it in this lecture the size 04:29.870 --> 04:34.830 straight sized with. 04:35.040 --> 04:35.930 We have 04:39.320 --> 04:42.290 we have any constants for this. 04:42.390 --> 04:48.350 Add one or get some so alien. 04:48.510 --> 04:49.450 Right. 04:55.940 --> 05:08.270 Is for right because there's all it there will be actual sprites which we haven't actually made yet. 05:09.060 --> 05:10.900 Yulian spirit 05:13.960 --> 05:15.540 aliens right. 05:17.820 --> 05:18.620 Right. 05:20.160 --> 05:20.680 This to 05:24.220 --> 05:25.260 you mean. 05:25.400 --> 05:26.330 Right. 05:33.830 --> 05:37.860 All right signs start right. 05:40.470 --> 05:41.350 All right. 05:44.280 --> 05:45.070 OK. 05:47.890 --> 05:51.590 So just say the number of bombs. 05:52.560 --> 05:54.210 They zero. 05:55.440 --> 06:06.840 Initialization and let's set the position is it's position so the exposition essentially we want them 06:06.840 --> 06:11.520 to be in the very middle of the screen. 06:11.750 --> 06:13.670 So we're going to say 06:17.210 --> 06:18.540 D-Md.. 06:22.430 --> 06:40.140 Size dot with Minus the number of alien columns are eight times the aliens. 06:40.320 --> 06:41.930 Each sprite sized 06:45.040 --> 06:56.470 And so this is how much space the aliens take up minus the actual width of the window and all of this 06:56.470 --> 06:57.170 over to 07:01.200 --> 07:05.040 see see if this is good enough. 07:07.280 --> 07:19.260 And for the aliens dot position why I say the game dot window sized height 07:22.120 --> 07:31.840 Minus the number 18 columns. 07:37.290 --> 07:40.870 Minus well 07:43.700 --> 07:44.800 minus the number. 07:44.800 --> 07:50.120 Alien Rose times the Erian. 07:50.340 --> 07:51.320 Right. 07:54.980 --> 07:57.240 Or say aliens. 07:58.930 --> 08:00.890 Spryte right. 08:03.420 --> 08:09.340 In minus the 08:16.540 --> 08:31.160 alien RWS minus one minus three last game dog level. 08:31.470 --> 08:37.080 So not going to explain this quite yet but we'll see. 08:37.120 --> 08:38.340 Second. 08:39.450 --> 08:43.550 We're also going to say the aliens 08:46.650 --> 08:50.730 line is number. 08:52.400 --> 09:02.470 Columns which is 11 minus game level 1 is. 09:05.270 --> 09:12.310 And so are you aliens dot split end timers. 09:12.400 --> 09:16.040 Now this might change. 09:16.200 --> 09:19.730 We'll see we'll probably make it a revision for this in a second. 09:19.780 --> 09:23.620 Once we actually get everything to be drawing properly. 09:23.810 --> 09:30.850 So let's now let's actually define the sprites of the elite. 09:30.950 --> 09:49.500 It's so x dot each an essay contest Shaar star are going to you do the alien 30 point sprite first. 09:51.350 --> 10:00.580 And if you remember year somewhere thirty point aliens look like this. 10:02.110 --> 10:02.770 OK. 10:03.320 --> 10:06.200 So let's do that. 10:06.210 --> 10:13.510 So it looks like Ford slash two O's and two backslashes. 10:15.320 --> 10:18.180 OK to escape the backslash. 10:18.190 --> 10:19.780 So that's the first part. 10:21.100 --> 10:24.360 And ex-parte is like that. 10:24.600 --> 10:25.240 OK. 10:26.240 --> 10:31.150 And next part is same as the first 10:34.450 --> 10:46.390 in forward slash pack slash coach and another backslash coach and then two backslashes. 10:50.870 --> 10:54.800 There's the first alien 10:57.880 --> 11:02.780 class char you know in the 20 point sprite. 11:10.590 --> 11:13.490 In they're going to look like this. 11:16.570 --> 11:23.040 Space and then the kind of rate freezing angle and the left facing angle brackets. 11:25.070 --> 11:25.970 And then 11:28.910 --> 11:43.880 a solid line two backslashes one forward slash in other recline an vertical line. 11:44.290 --> 11:45.070 This 11:48.380 --> 11:54.920 and Ford slash two spaces actually backslashes. 11:55.440 --> 12:04.990 The pointing point Spryte cuts Chaar star really in ten point separate 12:09.410 --> 12:10.010 so 12:13.740 --> 12:16.790 forward slash to kind of dashes. 12:16.810 --> 12:27.360 And then two back slashes first and then forward slash two spaces two backslashes 12:30.820 --> 12:33.880 and then kind of the same as the first one. 12:35.610 --> 12:43.450 In an angle two spaces angle that connects. 12:43.490 --> 12:46.720 Now we have the sprites for the aliens. 12:50.010 --> 12:51.850 So now let's 12:55.390 --> 12:57.190 actually call 12:59.690 --> 13:03.240 the. 13:03.440 --> 13:08.150 Let's actually implement the Tirah functions for the aliens. 13:11.380 --> 13:13.330 And so in 13:19.320 --> 13:29.850 and we'll say draw game drug games also going to take the aliens now we need to change dreich game to 13:29.990 --> 13:31.630 the aliens. 13:33.620 --> 13:39.570 Such an alien swarm reference it says 13:47.320 --> 13:54.340 US here it's means warm 13:56.920 --> 13:57.220 it's 14:01.370 --> 14:09.070 an now should make a function to actually draw the aliens like we had. 14:09.340 --> 14:21.560 We have a player in shields so let's admit that it's actually clear that Boyd draw aliens 14:23.680 --> 14:27.250 and really it's just going to swarm 14:32.420 --> 14:33.200 reference 14:38.300 --> 14:39.100 capias 14:41.890 --> 14:44.720 and in drug game or you can call it 14:47.870 --> 14:49.320 draw aliens 14:51.870 --> 15:07.580 in this way down here are going to draw. 15:07.760 --> 15:18.370 So now for the drawing essentially need to draw one row of the thirty point aliens. 15:18.460 --> 15:31.830 Or as I say draw one row of the early church you know it's and the next thing we need to do is draw 15:32.280 --> 15:39.990 one row or two rows three of the one point you know it's 15:43.310 --> 15:47.350 and drawn two rows. 15:48.830 --> 15:51.560 Ten point which is 15:55.840 --> 15:56.480 K. 15:56.550 --> 16:05.000 So it's going to be kind of broken up into three different of methods or functions sort of. 16:05.370 --> 16:14.690 So start with the easy one for us is go through all the columns 16:17.090 --> 16:18.270 columns. 16:18.300 --> 16:22.600 It's less than the number of alien columns. 16:25.650 --> 16:26.280 Plus 16:29.480 --> 16:38.740 and we need to get the position things in X equals to aliens. 16:40.560 --> 16:51.870 Position X was column times the aliens dot sprites with 16:55.530 --> 16:56.820 an inch. 16:56.850 --> 16:58.270 Why. 16:58.450 --> 17:03.040 Because x and y position. 17:03.450 --> 17:06.220 This will just be the position of you. 17:06.300 --> 17:13.960 So remember this aliens opposition is the kind of global position of the entire block of alle aliens. 17:14.000 --> 17:29.290 OK so now we should actually we should check if aliens dot the aliens of the first row. 17:30.580 --> 17:35.050 And of current column if they are alive. 17:37.460 --> 17:42.720 Right then we should draw. 17:42.830 --> 17:43.570 Right. 17:46.040 --> 17:59.790 Exposition y position the alien thirty's bright this aliens dot us 18:03.650 --> 18:07.320 that's bright stopped right. 18:12.020 --> 18:25.720 So now it's draw the 20 point is this is all we really have to do for now at least for the three points. 18:25.940 --> 18:32.820 Now we basically need to do the same thing but now we need to draw two rows of these. 18:32.960 --> 18:45.600 So for in our schools zero our is less than is going to make constant comments in each 18:48.670 --> 18:58.010 number of twenty point in roads like this is to 19:00.740 --> 19:03.430 so sure you don't have magic numbers in here. 19:03.430 --> 19:04.470 OK. 19:04.620 --> 19:19.890 So our bus rubbish call it row makes more sense in terms of readability gōde. 19:20.240 --> 19:23.390 And then we'll do the same columns again. 19:36.960 --> 19:48.560 So and now we need to figure out the proper positioning of everything so the exposition will be the 19:48.800 --> 20:01.590 aliens dot position dot X loss column times the aliens the arch sprite sized 20:06.530 --> 20:30.950 and y in stodge position Y plus the row times the aliens dot sized height or sprits size height. 20:32.000 --> 20:35.600 And plus that number of 20:39.870 --> 20:43.020 so and another constant. 20:43.740 --> 20:53.100 Well we're having other conc here and this is going to signify how many rows we have of these three 20:53.800 --> 20:54.690 as well. 20:54.730 --> 21:00.960 Now explain exactly why I'm doing second. 21:06.120 --> 21:07.560 Is that 21:10.360 --> 21:15.470 and times aliens. 21:16.880 --> 21:19.210 Sprits not right. 21:20.940 --> 21:24.060 So essentially what this is saying is 21:27.740 --> 21:31.520 you know this is basically the same thing as here. 21:32.150 --> 21:45.500 So just be after the next bright and this is saying depending on the row like B after the Spryte above 21:45.500 --> 21:50.320 you say so. 21:50.330 --> 21:55.450 So there's one kind of row of sprites above the twenty point aliens right. 21:55.460 --> 21:57.440 This thirty point alians row. 21:57.710 --> 22:03.330 So you have to be kind of below that essentially. 22:03.360 --> 22:06.360 So then we'll just do the exact same thing. 22:11.350 --> 22:13.930 And instead of 22:19.610 --> 22:34.440 instead of zero here we need to say that number of 30 points you mean Rose plus the current row that 22:34.440 --> 22:35.360 you're on. 22:35.700 --> 22:40.030 So it starts at the second row right. 22:40.070 --> 22:46.460 So it's already one rope above you and we go until there's no more rows. 22:46.470 --> 22:51.490 This this type of Balian. 22:51.590 --> 22:54.620 So now the last one 22:57.550 --> 23:02.000 will kind of run it and see how everything looks. 23:02.050 --> 23:06.770 The last one is essentially the same thing. 23:06.810 --> 23:11.460 So I'm going to need another Constance 23:14.100 --> 23:15.180 number 10. 23:15.180 --> 23:16.050 All right. 23:17.640 --> 23:24.680 And it's also to. 23:24.830 --> 23:29.160 So again both through the number of rows for it. 23:41.500 --> 23:46.520 Polls pass through columns in 23:59.280 --> 24:01.780 your column it's 24:05.980 --> 24:09.600 and again the exposition will be essentially the same 24:32.790 --> 24:38.800 and for the y position it'll be a little bit more complicated. 24:39.020 --> 24:44.170 It's going to be alians dot position dot y. 24:46.300 --> 24:50.440 It's our times or road Times 24:52.970 --> 25:01.650 aliens dot right sized height. 25:01.920 --> 25:08.790 And like before then plus the number of thirty point 25:11.380 --> 25:14.500 eighteen Rose times. 25:16.950 --> 25:18.830 Ariens each 25:22.320 --> 25:38.980 sprite sized tight and plus the number of twenty point you time is 25:42.580 --> 25:48.930 right size dot height. 25:49.360 --> 26:02.030 So this is saying like B after the first three rows essentially and and similarly to bar we have to 26:02.030 --> 26:11.590 see aliens dot aliens of number of 30 point 26:16.290 --> 26:24.420 alien RWS plus number of 20 point 26:28.810 --> 26:31.730 Rose plus Roe. 26:31.840 --> 26:32.150 OK. 26:32.160 --> 26:34.350 So again start here. 26:35.170 --> 26:39.670 Started this number of rows because we have two before us. 26:39.670 --> 26:46.510 And then add the current row that were on and same thing as above. 26:47.340 --> 26:52.420 And again the column then was checked to see if this guy is alive. 26:56.560 --> 27:03.220 And if he is we will there should be 20 points right. 27:03.250 --> 27:04.420 Is this 27:07.820 --> 27:11.010 in 10 points right. 27:11.700 --> 27:15.140 So as long as they are alive drop them. 27:15.390 --> 27:17.570 Otherwise dont. 27:17.580 --> 27:20.770 So now that we have all this. 27:20.910 --> 27:24.140 So this is a pretty big function right. 27:24.380 --> 27:27.040 And hopefully it sort of makes sense. 27:27.130 --> 27:30.120 The some changes there is that we have to do 27:32.630 --> 27:39.480 but for the most part I think were good so as to check the aliens. 27:39.490 --> 27:48.450 Yes drug game aliens in dry out aliens is empowerment. 27:48.510 --> 27:52.130 So see what happens. 27:52.340 --> 27:52.700 Its run it 27:56.970 --> 28:03.510 so all was good right. 28:05.110 --> 28:08.930 They look a little too bunched together right. 28:09.870 --> 28:19.350 Theres no kind of padding between them in either the x or y directions. 28:19.350 --> 28:24.790 So let's actually start giving them some padding as well. 28:25.590 --> 28:41.260 So let's Is this an index invaders dot each we should give the aliens some padding. 28:41.400 --> 29:01.050 So we say aliens X padding is one in aliens y patting It's also on. 29:01.210 --> 29:09.820 So let's add some padding into everything so initialize 29:12.520 --> 29:22.380 in the exposition you want to say number of aliens and alien columns times times. 29:22.860 --> 29:24.570 But watch this be 29:27.650 --> 29:28.970 Plus the padding 29:33.220 --> 29:43.490 because we're going to have that amount of padding in in the extraction. 29:43.940 --> 29:55.040 And similarly with the y position we need to say 29:57.950 --> 30:00.120 after the aliens. 30:00.190 --> 30:11.940 I like this aliens spatting that. 30:13.540 --> 30:18.730 And actually and get this wrong this many times this 30:22.630 --> 30:31.630 because it is because there is since there's five alien Rose there should be four rows of padding between 30:31.630 --> 30:32.500 them. 30:32.780 --> 30:35.950 So I miss the four. 30:36.280 --> 30:38.850 So that is OK. 30:38.860 --> 30:45.230 So now it's actually put some padding between the aliens themselves. 30:45.320 --> 30:54.990 So the first road I don't think needs any padding. 30:55.050 --> 31:08.120 OK the next two rows do and in here I was going to say add 31:10.630 --> 31:13.290 Union spatting 31:16.520 --> 31:20.910 aliens expanding right there. 31:21.770 --> 31:31.370 And with the height as well we're going to add the aliens wipe out like that. 31:31.480 --> 31:46.930 K so it's going to do paddings here and also you need the alien paddings hears all 31:54.680 --> 32:02.100 it needs to be in both spots and are to do the same for the next one. 32:42.040 --> 32:53.140 OK so if you're right there's no. 32:53.670 --> 32:57.930 We've got some padding for the first row. 32:59.600 --> 33:06.850 Should be columns times that was the you know it's 33:09.460 --> 33:09.990 expanding 33:16.570 --> 33:20.440 this and you're right it 33:24.270 --> 33:28.760 now we have all the aliens drawing. 33:29.100 --> 33:31.000 And of course it can't hit them yet. 33:35.680 --> 33:37.110 It can't go through 33:40.360 --> 33:49.470 so we're going to actually do some collisions with the aliens in the next lecture.