WEBVTT 00:01.230 --> 00:09.690 Know that we have our aliens drawing and we can actually shoot them I want to of finish up the explosion 00:09.690 --> 00:17.900 of it and to do that we'll need a new function and call it update. 00:17.960 --> 00:18.900 Aliance 00:21.200 --> 00:23.360 and take the game 00:28.160 --> 00:30.620 and take alians 00:36.370 --> 00:38.470 and take the player 00:42.450 --> 00:43.710 in. 00:43.780 --> 00:49.330 I'm also going to pass in the shields for him but not going to use this lecture but will need them for 00:49.340 --> 00:49.950 later. 00:54.530 --> 01:07.550 That so the aliens are going to do is it's going to come down the explosion every time it updates and 01:07.550 --> 01:13.850 then any any aliens that are exploding 01:16.160 --> 01:18.840 should then kind of be cleared. 01:19.020 --> 01:32.980 OK so to say if it's aliens dot explosion Taimur is greater than zero. 01:34.320 --> 01:39.580 Returned equals zero then or say aliens dot an explosion 01:41.940 --> 01:52.350 Ramer minus minus k so even if even if it's 0 then it will get minus minus that will equal to not in 01:52.360 --> 01:52.870 place. 01:52.870 --> 02:04.720 So if explosion remember is zero then explosion 02:07.450 --> 02:15.240 timer will be set to not in play effectively. 02:16.160 --> 02:24.660 So then we're going to go through all the aliens 02:58.540 --> 03:11.830 that and to check to see if they're exploding ants row column and if they're exploding 03:14.720 --> 03:18.470 and the timer explosion timer 03:23.850 --> 03:27.650 is equal to not in play. 03:30.800 --> 03:32.400 Playing like this. 03:33.420 --> 03:36.130 Then we're going to set the aliens to be dead. 03:38.290 --> 03:38.760 OK. 03:38.790 --> 03:46.410 So essentially we're just kind of clearing all the aliens that have been exploding up until this point 03:47.170 --> 03:51.490 and we're just setting them to be gone now. 03:51.510 --> 04:10.310 So if we actually call this in it's a game and say date aliens in repasts game player whether the player 04:10.740 --> 04:11.990 or aliens 04:16.050 --> 04:25.910 and the player the shields and the number of shields like so OK. 04:26.180 --> 04:27.440 So if you run this 04:31.140 --> 04:36.720 then you see how it explodes for a second and then it disappears. 04:36.800 --> 04:39.690 They just kind of what you want. 04:39.870 --> 04:42.790 So that looks pretty good so far. 04:46.270 --> 04:53.020 Now we want to have our aliens kind of move. 04:53.500 --> 04:54.250 OK. 04:54.610 --> 05:04.930 And to do that we'll be still working in the aliens function and we're going to have 05:08.320 --> 05:24.320 centrally we're going to count down the amount of time that the alien. 05:24.370 --> 05:34.000 So essentially every few every amount of a certain amount of time we're going to move the alien to the 05:34.030 --> 05:35.880 right or left. 05:37.700 --> 05:50.350 So to do that we're going to we're going to make a new function first. 05:51.260 --> 06:03.830 And we're going to call it a reset movement time and make a new function here. 06:03.840 --> 06:13.160 BOYD It's called Reset movement time like this in we're going to pass it in the alien swarm 06:24.590 --> 06:32.480 and this is really it's kind of up to you how you want to implement it. 06:32.480 --> 06:38.080 Actually there's no right way. 06:38.110 --> 06:42.260 I don't think to do it. 06:42.290 --> 06:47.410 But here's kind of what I found to be kind of nice in a movement. 06:47.410 --> 06:56.330 Time is the movie Time and we're going to set it to some amount and it's going to be based on the current 06:56.330 --> 07:05.810 line that the aliens are on times two plus two times or five or five times 07:10.560 --> 07:13.680 the amount of aliens that are left. 07:14.440 --> 07:22.840 So it means that none of you are left over. 07:23.210 --> 07:27.880 Of the number total aliens 07:37.800 --> 07:38.390 OK. 07:38.550 --> 07:42.080 So this is kind of just something I came up with. 07:43.750 --> 07:53.100 So essentially though the lower the amount of aliens the lower this movement time will be essentially 07:53.380 --> 07:53.790 trying. 07:53.800 --> 08:06.250 So meaning that after we every time this in time hits zero will move the alien K and it it goes faster 08:06.250 --> 08:11.040 depending on depending on how many aliens are left. 08:11.440 --> 08:15.090 So this is just something I sort of came up with. 08:15.100 --> 08:21.620 It doesn't really matter you can come up with your own kind of formula or use mine. 08:21.760 --> 08:23.710 It doesn't matter that much. 08:23.810 --> 08:31.090 OK so I'm actually going to call it in initialize aliens. 08:31.150 --> 08:33.320 I'm going to say here. 08:35.660 --> 08:39.200 So notice we never set movement time ever. 08:39.680 --> 08:50.540 So we're going to reset time. 08:50.750 --> 09:07.170 Really it's like so and now every so often when the movement time is zero we will essentially move the 09:07.170 --> 09:08.060 aliens. 09:08.100 --> 09:22.430 So aliens Dot meant time is minus and then we're going to need some which you need some 09:26.100 --> 09:32.580 boolean values and stuff that's cool and I say move horizontal 09:36.080 --> 09:39.560 and can move horizontal. 09:40.590 --> 09:47.170 If it's if 0 is greater than or equal to the aliens movement time. 09:47.210 --> 09:53.130 So basically if if the moving time is zero we're going. 09:53.290 --> 09:54.120 OK. 09:54.710 --> 09:55.670 And 09:58.660 --> 10:03.930 going to also need so if I just kind of run this for now. 10:06.660 --> 10:17.790 Not going to move yet but see how you say I kind of kill this row of aliance 10:20.670 --> 10:33.010 if they should move to the right day initially and if these aliens hit the edge of the screen then it'll 10:33.040 --> 10:35.490 move down and then go back. 10:35.500 --> 10:36.070 OK. 10:36.400 --> 10:39.370 So we need some way of getting 10:41.840 --> 10:53.930 like all the empty columns and rows that exist to the left and right of the alien swarm. 10:54.050 --> 11:00.920 And so if I kill that it's killed three columns of the alien swarm so now they would they would only 11:00.920 --> 11:05.240 move down if these guys. 11:05.250 --> 11:09.140 These aliens are here hit the right edge. 11:09.220 --> 11:15.820 KAYE So we're going to kind of have to factor that in somehow. 11:16.200 --> 11:34.300 And we're going to do that by having some say empty columns to the left in just how many empty columns 11:35.630 --> 11:36.700 to the right 11:40.170 --> 11:43.350 and also we don't have empty columns to the bottom. 11:43.600 --> 11:46.970 Well are empty roads. 11:47.010 --> 11:47.820 Yes. 11:53.360 --> 11:54.150 OK. 11:54.630 --> 11:57.000 And I'm going to. 11:57.090 --> 12:04.450 Not yet but I'm going to write the function called find empty rows and columns. 12:06.980 --> 12:13.620 And I'm going to pass the aliens and the empty homes if it's 12:17.350 --> 12:21.420 de columns. 12:21.880 --> 12:22.750 Right. 12:25.060 --> 12:37.100 D Rose bottom. 12:37.740 --> 12:38.700 OK. 12:38.780 --> 12:46.250 And these largely find all the empty row empty columns and and bottom rows that we have in the elite. 12:46.340 --> 12:48.050 It's OK. 12:48.170 --> 12:55.880 And again we're going to need that so when they actually move to the right or left in the then we know 12:57.650 --> 12:59.140 which. 12:59.570 --> 13:06.340 Which columns should hit the the edge before it actually moves down. 13:06.490 --> 13:07.560 And then back. 13:07.560 --> 13:08.080 OK. 13:10.230 --> 13:14.560 So we're going to need that at some point or we're not going to implement that just yet. 13:14.780 --> 13:23.900 And in a minute and or in say a number of columns is the number is 13:26.780 --> 13:28.550 is the number of 13:31.190 --> 13:35.080 union columns minus empty 13:37.570 --> 13:42.990 columns left minus the in the columns right. 13:45.390 --> 13:52.970 That's just how many are actually left and we're going to get the Left position 13:58.090 --> 13:59.610 of the aliens 14:02.490 --> 14:08.950 and or in-seat aliens dot Sion X plus 14:11.240 --> 14:16.810 and B are empty columns. 14:19.920 --> 14:24.760 And d Combs left Heinz 14:29.310 --> 14:41.790 unions don't great sized weight loss. 14:41.890 --> 14:46.120 You know it's expanding 14:58.060 --> 15:02.530 and we're also going to need the right position 15:13.630 --> 15:18.870 or should be left in the ocean. 15:20.990 --> 15:28.480 What's the number columns that we have times in 15:31.780 --> 15:33.360 sed rate. 15:33.750 --> 15:35.550 So it's 15:43.720 --> 15:51.310 just the number of columns it's one times you know millions 15:53.940 --> 16:01.740 patting things are just getting the left and right side of the aliens warm day. 16:01.840 --> 16:03.650 It's already here. 16:03.700 --> 16:05.320 So if 16:09.540 --> 16:20.620 you're right alien position is greater then the game not the size. 16:21.150 --> 16:27.730 Wit and we're going in the right direction. 16:30.210 --> 16:31.580 It's greater than zero. 16:32.570 --> 16:33.260 Or 16:35.990 --> 16:38.820 the left alien position. 16:40.740 --> 16:42.330 Is less than or equal to zero. 16:42.350 --> 16:48.210 And aliens dot direction is less than zero. 16:53.910 --> 16:54.720 And 16:58.130 --> 17:07.530 we have to move horizontal or the next move is the horse is a horizontal move and we're not done game. 17:11.760 --> 17:16.410 So we're not at the end of the actual thing here. 17:18.500 --> 17:26.420 So lines really just means like level or at or like not level but like what current row we're at. 17:26.420 --> 17:42.160 So if the row is 11 then we have to invade now essentially then we will move I say move horizontal is 17:42.160 --> 17:47.410 false because we're actually going to move down here. 17:47.590 --> 18:03.030 This is the move down because we've hidden edge K and or Asay aliens dot position dot y plus plus the 18:03.040 --> 18:04.990 next line. 18:04.990 --> 18:09.570 Aliens dot line minus minus. 18:09.660 --> 18:11.340 We're going to switch the direction 18:17.840 --> 18:20.450 this means. 18:22.200 --> 18:30.610 Action and you're also going to reset the movement time 18:33.560 --> 18:42.610 the aliens say because we need to do this all over again the next time right. 18:43.160 --> 18:46.810 And we're going to say If move. 18:46.830 --> 18:47.690 Horizontal 18:51.980 --> 19:04.460 then the aliens position X plus ghouls aliens direction. 19:04.800 --> 19:07.490 We're going to reset the movement time again. 19:09.050 --> 19:12.480 Because we just went whatever direction that we're going in. 19:12.470 --> 19:21.710 So you have to wait some amount of time again to do it and say aliens dot animation 19:24.230 --> 19:28.030 and animation. 19:28.100 --> 19:31.190 So if it was 0 then it should be 1. 19:31.200 --> 19:32.090 Otherwise it's 19:35.380 --> 19:39.890 so this was kind of a lot of stuff and we're still not done. 19:40.360 --> 19:44.890 But kind of to recap essentially again if I run this 19:48.750 --> 19:51.170 this for now. 19:51.330 --> 19:57.820 So if I run this up see how they're moving already. 20:00.260 --> 20:01.960 They're not animating yet. 20:02.690 --> 20:07.610 So once they hit the right edge here they should go back 20:12.110 --> 20:16.320 see it drop down and then now they're going backwards. 20:16.320 --> 20:16.750 OK. 20:18.200 --> 20:28.660 So that's kind of nice but kind of recap this or actually this is actually a good example. 20:28.660 --> 20:29.200 So 20:32.500 --> 20:38.980 the reason why we did this kind of left alien position right aliens mission is to see where the left 20:38.980 --> 20:40.020 most are. 20:40.030 --> 20:43.700 In this case the most alien position is which is right here. 20:43.840 --> 20:50.080 So say I only had I had like this. 20:50.140 --> 20:54.640 This is still the rate most alien position because I have an alien on the right. 20:54.760 --> 20:55.460 OK. 20:55.540 --> 20:58.910 So this whole column hasn't been cleared yet. 20:59.020 --> 21:08.370 So if this hit the right edge then we should drop down and then go to the left again. 21:08.710 --> 21:17.230 So that's really what all of this is saying saying find me the left edge of the aliens find me the right 21:17.230 --> 21:26.950 edge if the right edge of the aliens is greater than the window size. 21:26.950 --> 21:34.990 So if it's at the if it's at the actual and or the rightmost edge of the window and we're going in the 21:34.990 --> 21:47.780 right direction or if we're at or if the left edge of the aliens is at the left edge of the screen and 21:47.800 --> 22:00.840 we're going left and we have it and we can move right then go down OK so move down and then switch or 22:01.440 --> 22:03.070 directions. 22:03.930 --> 22:12.980 And Doree this line stuff for now we're going to get to that of later so move down and then don't move 22:12.990 --> 22:13.900 horizontal. 22:14.120 --> 22:15.320 OK. 22:15.330 --> 22:23.460 And then otherwise if we didn't move down just keep moving in the direction you're going and then reset 22:23.460 --> 22:27.890 your movement time and then switch your animation. 22:29.210 --> 22:31.360 So now let's deal with the animations. 22:31.370 --> 22:34.580 It kind of looks kind of good. 22:35.480 --> 22:38.800 So don't worry about this stuff yet. 22:38.960 --> 22:40.420 OK. 22:40.460 --> 22:42.010 We'll do this after. 22:42.500 --> 22:44.150 So in our 22:46.290 --> 22:47.340 utils 22:49.780 --> 22:56.550 what I want to do is I want to have the offset here. 22:58.140 --> 23:01.230 And this offset will actually be animation. 23:01.230 --> 23:07.300 And so if you look at Texana baiters that H. 23:07.380 --> 23:18.450 So it goes 0 1 2 3 for our sprites and the height of the sprite is 2. 23:18.450 --> 23:27.600 So we have to go by twos for animations so 0 is the first animation and then it's starting at 2 0 1 23:27.600 --> 23:31.220 2 is the next Sprite to draw. 23:31.410 --> 23:37.210 Ok so this offset here really will be the animation that we're at. 23:37.480 --> 23:38.120 OK. 23:38.990 --> 23:45.700 So now that we have that in our raw 23:48.480 --> 23:58.600 in our draw we need to also pass the animation that we're on aliens 24:00.750 --> 24:10.720 animation times the aliens dot straight sized dot height. 24:11.710 --> 24:14.860 Are going to pass this. 24:15.100 --> 24:17.410 So this will kind of skip. 24:17.470 --> 24:26.200 So if the animation is 0 then it'll only draw the first two and if the animation is one it'll skip the 24:26.200 --> 24:28.810 first two and then only draw the second two. 24:28.960 --> 24:33.240 OK so are shouldn't be here it should be. 24:33.350 --> 24:39.030 No no animation for the explosion should be in the actual when it's alive. 24:39.790 --> 24:42.790 And just copy and paste that for each one 24:49.000 --> 24:49.800 OK. 24:49.840 --> 24:52.750 So now if we run this 24:57.360 --> 25:04.030 see them move or see them animate as they move. 25:08.100 --> 25:09.720 So you know that's working. 25:13.490 --> 25:19.270 And it should drop down and keep animating and going to laugh. 25:19.660 --> 25:23.570 Hey so that's pretty cool. 25:23.630 --> 25:32.450 But they don't teach us this too but they don't actually hit the proper edge yet we still haven't done 25:32.450 --> 25:41.510 that because we can commented out this function and what this function will do. 25:42.960 --> 25:52.990 Is it will actually find which rows and columns are actually got this point. 25:54.040 --> 25:56.840 So what's actually infinite this. 25:57.030 --> 26:01.320 This one's going to be actually fairly long. 26:02.760 --> 26:03.540 Fortunately 26:06.990 --> 26:08.570 But it's important to us. 26:08.590 --> 26:10.630 So Boyd 26:13.950 --> 26:17.050 an we're not going to change the aliens at all. 26:22.540 --> 26:28.530 Passed in these by reference because these are going to be kind of the output function 26:33.230 --> 26:36.240 so start implementing this. 26:36.260 --> 26:42.660 So I hope the animation portion of it made sense of what's what's happening. 26:42.670 --> 26:43.910 OK. 26:47.870 --> 26:49.630 I hope hope that makes sense. 26:49.630 --> 26:57.040 So really we're just kind of indexing further into the array for the sprites. 26:57.050 --> 27:01.160 Jay that's that's really what this is this is doing. 27:03.860 --> 27:07.510 So for the find empty rows and columns 27:12.300 --> 27:17.480 save you found false 27:20.910 --> 27:25.330 in we're going to go by columns this time and not rows 27:30.510 --> 27:34.300 and this will be kind of the left. 27:35.370 --> 27:37.130 We're going to check all the left columns. 27:40.860 --> 27:41.150 It's 27:44.310 --> 27:44.600 from 27:50.520 --> 27:51.060 column 27:55.050 --> 27:59.120 that and then we'll go through rows of that column 28:14.360 --> 28:21.640 and this found will essentially once we find someone in that column then we're done. 28:22.630 --> 28:33.760 So if aliens dot millions of row and column. 28:34.210 --> 28:37.580 So as long as it's dead we'll keep going. 28:37.920 --> 28:48.110 We're exploring the as dead. 28:48.200 --> 28:50.270 Or maybe we shouldn't have it actually. 28:50.330 --> 28:57.490 So maybe if it's exploding it shouldn't because there might be some weird problem with that actually. 28:57.530 --> 29:05.950 So if the row alien is one 29:14.060 --> 29:18.710 so if we're at like the end of the rose. 29:18.910 --> 29:21.710 So this is the last row 29:25.680 --> 29:28.290 then we know there's no 29:30.960 --> 29:33.020 there's no column there. 29:33.040 --> 29:33.810 They're all that 29:39.440 --> 29:45.880 should be. 29:46.270 --> 29:49.610 Otherwise we found one. 29:49.770 --> 29:56.490 So we should kind of exit out of this and we're done and we're done. 29:56.990 --> 30:01.540 And that's essentially what we're going to do for the other side. 30:03.790 --> 30:11.010 So I reset this false accuracy for it. 30:11.010 --> 30:11.760 See 30:14.840 --> 30:15.990 Ilion. 30:16.010 --> 30:18.760 COLMES So now we're starting at the right 30:21.450 --> 30:27.900 sees zero found. 30:28.180 --> 30:29.350 It's minus. 30:29.390 --> 30:32.030 So start from the right and work your way back. 30:32.120 --> 30:38.170 Back in the couples column C 30:47.690 --> 30:57.590 is in row 0 row is less than number of alien rows. 30:57.800 --> 31:00.170 And again we haven't found anything 31:04.210 --> 31:08.490 ropes plus. 31:08.700 --> 31:20.830 So basically the same thing if aliens dot row column is dead. 31:25.070 --> 31:25.590 Right. 31:36.630 --> 31:41.970 And if the rover at the last row 31:46.430 --> 31:49.580 then this is an empty column 31:53.250 --> 31:54.650 go straight. 31:59.130 --> 32:03.510 Going otherwise we found something 32:07.580 --> 32:08.960 exit out of this entire. 32:08.960 --> 32:12.200 And raising this found by the way to the exit of two loops. 32:12.260 --> 32:12.920 OK. 32:13.280 --> 32:21.540 So both loops are exiting out of that's where we're now using break here just for information. 32:21.810 --> 32:25.380 And we're also going to loop over the 32:29.040 --> 32:32.340 loop over the bottom 32:35.210 --> 33:19.730 falls or in touch bottom rows they. 33:19.840 --> 33:29.270 So if gange these same thing and dot row home 33:32.120 --> 33:33.890 it's all dead. 33:36.210 --> 33:39.180 Then read the last column 33:52.940 --> 33:59.550 and we know we have an empty row in the bottom 34:04.120 --> 34:10.910 K else. 34:11.570 --> 34:23.780 So I don't run this without calling this function and I'm going to run this with calling this function. 34:23.800 --> 34:35.410 So I'm going to not call this function you know run it and when do is I'm going to attempt to you destroy 34:35.410 --> 34:36.270 them all. 34:37.370 --> 34:42.390 For they get to and this 34:45.420 --> 34:54.970 so yeah see how they drop down even though they weren't at the edge. 34:55.090 --> 34:58.490 So which is I'm going to do this again. 34:58.500 --> 35:02.980 But have this find empty rows and columns 35:06.210 --> 35:08.580 to do the same thing. 35:22.630 --> 35:24.560 Kill three or one or three columns. 35:24.570 --> 35:26.920 Why not. 35:27.150 --> 35:30.100 Now see how they're not dropping down. 35:30.100 --> 35:41.470 They should have been dropping down by now if we had the find empty rows and columns called or not called. 35:41.540 --> 35:43.320 So see how they dropped down now. 35:43.860 --> 35:46.870 And at the end of this day. 35:47.100 --> 35:52.010 So that's why we need that function to actually 35:54.800 --> 35:58.690 to actually hit the edge properly. 36:05.390 --> 36:09.720 They just get the idea it's going to take too long to get. 36:09.730 --> 36:12.730 So you get the idea. 36:12.820 --> 36:16.010 So now that we have all that done 36:18.870 --> 36:21.500 in the next lecture 36:25.200 --> 36:30.780 we're going to work on having the aliens kind of destroying the shields. 36:31.060 --> 36:32.330 So see you then.