WEBVTT 00:00.760 --> 00:06.880 It we have the aliens trying to actually start quieting them with the missile. 00:06.880 --> 00:09.130 A player can shoot. 00:09.240 --> 00:16.220 So I'm also going to make another fiction called Collision 00:19.530 --> 00:25.250 in notice that it's the same name as this exclusion. 00:26.190 --> 00:32.680 But we're going to have different parameters for this one. 00:32.700 --> 00:36.170 So in this one I'm going to take the player 00:38.870 --> 00:43.650 and we're just practicing with our overloading functions here. 00:44.260 --> 00:47.410 Player and I'm going take the alien swarm 00:50.290 --> 00:51.810 by reference 00:54.920 --> 01:05.600 and I'm also going to do the same trick I did before which is pass in the position the alien collision 01:07.530 --> 01:08.280 position 01:12.810 --> 01:15.850 in in the actual alians array. 01:19.460 --> 01:28.730 So overturned true if there is collision and it all sort of turn where or which alien collided with. 01:28.870 --> 01:29.970 OK. 01:29.990 --> 01:36.150 So is this we down here to implement it. 01:38.020 --> 01:38.910 And 01:43.220 --> 01:48.900 you're going to say alien collision 01:51.900 --> 01:58.190 in array x is not in play. 01:58.240 --> 02:02.780 It's just like before. 02:02.800 --> 02:08.170 So there's there's no no alien guy yet. 02:08.300 --> 02:09.400 OK. 02:11.270 --> 02:16.190 QUESTION It's a machine or a 02:23.320 --> 02:24.470 like so. 02:24.810 --> 02:25.320 OK. 02:25.660 --> 02:33.730 So we're just going to loop through all of the aliens that we have so 02:36.640 --> 02:40.200 this number in those 02:44.070 --> 02:56.210 group plus in this column zero calling is less than the number of alien columns. 02:58.100 --> 02:58.980 Plus plus 03:01.550 --> 03:13.850 that and we're going to get the position of the elite position is it aliens. 03:15.020 --> 03:24.630 Position X plus which column we're at and in ch 03:27.320 --> 03:35.540 size with was the aliens X padding right. 03:35.580 --> 03:40.900 So we have to include the expiating see each column. 03:40.970 --> 03:42.720 See. 03:42.910 --> 03:46.380 And so really why position 03:57.760 --> 03:58.910 row time. 03:58.980 --> 04:09.170 It's it's ch great signs right. 04:10.050 --> 04:11.530 Was alians 04:19.040 --> 04:19.650 OK. 04:19.660 --> 04:28.990 So essentially we're going to do the exact same thing with The Shield so we can say if there is one 04:28.990 --> 04:32.130 new wrinkle which is quite simple. 04:32.530 --> 04:45.040 If the row if the aliens at that row and column is alive so they have to be alive and 04:50.120 --> 04:52.050 in the player 04:54.790 --> 04:55.810 missile 04:58.210 --> 05:07.400 x is greater than the exposition and where each missile 05:09.540 --> 05:17.730 X is less then the exposition Plus it means as 05:22.520 --> 05:22.710 with 05:30.480 --> 05:38.370 Schertz it's correct there ain't. 05:38.500 --> 05:41.080 So basically this is saying 05:43.600 --> 05:49.940 is is the missile within the 05:53.550 --> 05:55.700 boundary the X boundary 05:58.310 --> 06:01.680 of the current you know. 06:02.230 --> 06:03.090 Right. 06:03.310 --> 06:10.430 SINGH And similarly we need to do the same for the height and 06:14.330 --> 06:26.580 where Dot missile Y is greater than is greater than 2 or greater than or equal to y position and flared. 06:26.900 --> 06:32.300 Missile dog Why is less than Y position. 06:32.700 --> 06:34.710 Woss aliens. 06:35.060 --> 06:40.190 Spryte so each. 06:40.470 --> 06:44.400 So this is saying is it within the Y boundary. 06:44.640 --> 07:02.820 So and if it is then we just say alien collision session in re X is a column alien collision position 07:02.920 --> 07:04.520 in or. 07:04.760 --> 07:19.410 Why is the row and were turned true that we hit and otherwise at the very end we say or turn false. 07:19.870 --> 07:22.270 So that's kind of it. 07:22.840 --> 07:26.190 And also just like before. 07:26.230 --> 07:30.770 We need to resolve the alien collision. 07:30.850 --> 07:34.210 So you're right. 07:34.220 --> 07:38.540 Claire is going to return the. 07:38.560 --> 07:42.790 So if you hit an alien you get some amount of points right. 07:42.820 --> 07:47.590 So we're actually going to return the amount of points that we got. 07:47.590 --> 08:02.460 So that'll be part of the resolution of the hit collision the aliens swarm. 08:02.590 --> 08:10.330 Going to be by reference because we might change the aliens here and it also return the position that 08:10.330 --> 08:11.080 was hit. 08:11.110 --> 08:15.040 So hit sition 08:17.600 --> 08:20.940 ray which probably passes by conc reference 08:23.210 --> 08:27.920 so. 08:28.040 --> 08:32.030 So it's copy that here. 08:34.960 --> 08:36.890 Implemented and will say 08:39.690 --> 08:43.080 aliens. 08:44.640 --> 08:50.630 Unions and the position in 08:53.340 --> 09:01.740 it's Ray y for the row and the hit position 09:04.050 --> 09:07.620 means re x. 09:07.680 --> 09:13.350 So we're going to go to the next the next state which is exploding 09:16.720 --> 09:20.010 so it was hit. 09:20.230 --> 09:20.890 You know it's 09:26.690 --> 09:29.300 so it was hit. 09:29.360 --> 09:35.430 Now it's exploding in the number of aliens we have left is also 09:41.190 --> 09:42.530 B minus minus Rake's. 09:42.540 --> 09:46.940 We have 1 1 1 hit. 09:48.030 --> 09:53.920 And now we'll need that explosion timer as well. 09:53.960 --> 10:05.330 So if we go up here I'm going to say this is actually going to be not in play. 10:05.330 --> 10:12.590 And the reason I'm going to do that is if if it's not in play that means that we don't have anything 10:12.590 --> 10:14.290 exploding. 10:15.310 --> 10:17.750 So I say if 10:20.250 --> 10:27.750 aliens dot explosion Taimur is not in play. 10:30.300 --> 10:34.070 Then we're going to send it to some amount. 10:34.140 --> 10:42.710 So aliens dot explosion timer it's going to be some amount and we don't have this yet. 10:42.840 --> 10:49.710 Really explosion time OK. 10:49.740 --> 10:56.310 So we're going to see some amount that we have to find but we will and second and then we're just going 10:56.310 --> 10:59.500 to check to see which row we hit. 10:59.610 --> 11:01.170 So if hit position 11:03.870 --> 11:13.090 in aliens radar why was first row in or around turn 30 points right. 11:17.580 --> 11:30.930 Is that correctly you know otherwise if it's greater than or equal to the first row and if it's less 11:30.930 --> 11:34.960 than the third then returned 11:38.760 --> 11:40.280 20 points right. 11:42.290 --> 11:44.810 Otherwise return 11:47.290 --> 11:47.760 10. 11:47.950 --> 11:48.540 OK. 11:48.640 --> 11:54.400 This is this will do the actual points stuff. 11:54.440 --> 11:55.100 OK. 11:55.580 --> 11:58.980 So we need this explosion time. 11:59.090 --> 12:04.960 So in here as you say 12:08.610 --> 12:13.640 earns say it just sits for day. 12:13.860 --> 12:15.120 Whatever that means. 12:15.160 --> 12:20.430 Or just can be kind of quick so now 12:24.770 --> 12:32.450 now that we have the collision and solve collision we're going to say a d h. 12:35.210 --> 12:37.710 It's going to make an update. 12:37.870 --> 12:39.270 It's function. 12:45.080 --> 12:47.570 In here somewhere. 12:50.730 --> 12:51.710 I say 12:54.670 --> 12:55.300 cool 12:59.930 --> 13:05.890 Well actually just put it in the update function for now. 13:07.010 --> 13:24.000 So in a big game will say if you we need you in the position where you in collision point or say if 13:24.360 --> 13:27.220 the is 13:29.910 --> 13:41.230 vision where and the aliens and the player in an. 13:41.940 --> 13:43.140 So if there was a collision 13:45.700 --> 13:49.730 and of course we're going to need to add in 13:52.340 --> 13:57.140 aliens into the game here. 13:58.980 --> 14:05.100 Say alien swarm means like this 14:07.580 --> 14:08.340 game. 14:08.540 --> 14:09.790 Aliens. 14:13.870 --> 14:14.660 Also. 14:14.860 --> 14:25.650 It's here. 14:25.830 --> 14:35.620 So so if there was then we will reset the missile again because it hit something. 14:37.120 --> 14:49.270 And we'll also say that we're not score plus equals resolve the alien collision you know. 14:49.330 --> 14:59.950 And this is where you know collision point. 14:59.970 --> 15:02.780 So if we run this 15:05.770 --> 15:12.400 and we hit an alien it doesn't quite work yet. 15:17.290 --> 15:22.690 But at least it's dead for now. 15:22.690 --> 15:29.800 So and the reason why we don't it's not working is because or at least we kind of don't see it anymore 15:30.370 --> 15:35.350 because we're setting it into these exploding state. 15:35.350 --> 15:37.300 So we go back. 15:37.370 --> 15:37.580 It's 15:40.330 --> 15:44.610 an if we go to 15:47.370 --> 15:52.590 this function where he said it to the exploding state but we don't ever draw the exploding state for 15:52.590 --> 15:53.800 example. 15:54.210 --> 16:07.410 So let's actually make the exploding state for our aliens conc char star alien explosion 16:10.090 --> 16:12.620 and you be as creative as you like. 16:12.620 --> 16:17.510 I'm just going to say. 16:19.860 --> 16:32.890 This in re that CH like that for the top and the bottom like this. 16:39.120 --> 16:42.080 So that's the alien explosion Spryte. 16:42.090 --> 16:49.260 So let's actually draw the alien explosion inside of here. 16:50.950 --> 16:52.990 Inside of the draw 16:57.690 --> 17:16.060 draw the you know it's so in here we're going to say else if aliens dot aliens zero and call them is 17:16.060 --> 17:19.630 equal to a -- exploding 17:24.420 --> 17:26.670 then I will say draw Spryte 17:29.040 --> 17:39.640 exposition y position in this explosion and aliens dot is right sized right. 17:43.020 --> 17:47.140 So do that for each one here. 17:47.200 --> 18:02.040 Else if you aliens dot millions and see him. 18:02.880 --> 18:03.870 Let's row 18:08.800 --> 18:10.290 to exploding 18:16.750 --> 18:18.770 in sync here. 18:57.170 --> 19:04.090 OK so now if you run this should see the explosion. 19:04.290 --> 19:11.190 See and actually go through each one and actually explode it. 19:11.260 --> 19:14.200 There you go. 19:14.350 --> 19:22.150 We don't have so they don't disappear yet because our explosion timer that we set over here 19:24.870 --> 19:33.980 is the explosion timer that we set right here isn't being updated in any way. 19:34.290 --> 19:42.750 OK so I'm going to save this for the next lecture and in the next lecture we'll actually have them move 19:42.750 --> 19:48.650 around and if they do get killed they'll actually disappear. 19:48.810 --> 19:50.860 OK so I'll see you in the next lecture.