WEBVTT 00:00.670 --> 00:07.960 Know we've implemented most of the data we're going to need and kind of thought about it a little bit 00:08.020 --> 00:13.090 at least we're going to start actually implementing the game. 00:13.120 --> 00:20.100 So let's go to our main function right now a world here. 00:20.270 --> 00:21.190 Move this 00:23.930 --> 00:25.090 so. 00:26.210 --> 00:30.770 And first we're going to need to include 00:33.440 --> 00:35.450 text invader's. 00:35.530 --> 00:36.130 Each 00:39.900 --> 00:42.240 because we're going to need all this data. 00:42.410 --> 00:44.710 All of these definitions. 00:46.660 --> 00:54.720 And we're going to need our curses you tale's. 00:55.700 --> 00:58.210 So that's good for now. 00:59.030 --> 01:10.170 And now let's let's really just start with the main loop ok and or the main function in general. 01:10.250 --> 01:17.880 So we know we're going to need our game object that we made in TX in meters. 01:18.000 --> 01:18.740 H. 01:18.800 --> 01:19.990 This. 01:20.090 --> 01:31.300 And let's just start with the player as well and add extra extra variables of different types like the 01:31.310 --> 01:35.040 yelling swarm in the phone and all that later. 01:35.130 --> 01:35.610 OK. 01:36.390 --> 01:39.920 So what would we need to do. 01:40.050 --> 01:46.390 So we'll probably need some function to initialize the games. 01:46.390 --> 01:52.490 And when I say it's called in game and I'm going to give it again. 01:52.830 --> 02:01.340 And most are going to need something to get the player call it player and give it the player. 02:01.370 --> 02:09.080 So this in that game will kind of set up like all the data so that the window size and the level and 02:09.080 --> 02:17.720 the current state of that and and that player will you know set the initial position in missile and 02:17.870 --> 02:19.570 the size and stuff. 02:19.570 --> 02:19.940 OK. 02:21.850 --> 02:26.430 So what's right those functions. 02:26.810 --> 02:28.900 It's not her attorney thing. 02:28.910 --> 02:43.980 So in a game first in a passing game by reference and intimately with the pair going to say layer by 02:43.980 --> 02:44.850 reference 02:47.520 --> 02:51.960 that's ancient you implement them. 02:51.960 --> 02:53.240 Pretty simple for now. 02:58.940 --> 03:01.750 That K.. 03:01.870 --> 03:18.610 So for game really you just need to say let's initialize the window size so you get is we actually use 03:18.950 --> 03:24.850 cursus utils So we're actually going to get the screen. 03:25.370 --> 03:32.090 And use the screen with the function and the screen height function screen 03:37.040 --> 03:37.900 like that. 03:38.040 --> 03:44.240 And I was going to set the height as well 03:50.950 --> 04:04.180 and the level is put in one initially in the current state is going to be rocking to make it be the 04:04.180 --> 04:09.230 intro yet we're actually going to make it be placed first. 04:09.270 --> 04:10.090 OK. 04:10.450 --> 04:15.980 And the reason why we're going to do that so you look into here. 04:16.300 --> 04:25.380 I typically try to start with the most kind of common case that the player is going to be in. 04:25.390 --> 04:25.710 Right. 04:25.720 --> 04:28.920 So most of the time is going to be playing games. 04:28.990 --> 04:29.380 Right. 04:29.380 --> 04:34.570 So and really that's the most important part of the game is actually playing. 04:34.620 --> 04:34.970 Right. 04:34.990 --> 04:41.460 So I'm going to start the game currently in the police state. 04:43.080 --> 04:44.960 But this will have to change. 04:44.960 --> 04:47.460 So when you say to do 04:49.740 --> 04:55.080 change shoe Yes intro 04:57.890 --> 04:58.170 you 05:03.890 --> 05:05.490 have to do that later. 05:05.490 --> 05:10.890 But for now it's going to start in the play station kind of mess around. 05:10.980 --> 05:17.340 So the player then should be fairly simple. 05:18.620 --> 05:24.560 Where dots say his position 05:27.850 --> 05:34.950 or actually right to say his lives and he lives from last time. 05:35.100 --> 05:40.160 I didn't actually set them to zero but I said to him to be three but they should be. 05:40.830 --> 05:59.030 Copy this and say x number of lies lies the are going to set the right size to be some size so we don't 05:59.270 --> 06:00.800 have any constants for this. 06:00.810 --> 06:10.490 Let's make it so the right size we said in here would be where is Chubais 5. 06:11.810 --> 06:14.710 So set something here. 06:16.370 --> 06:18.200 Where Spryte 06:21.760 --> 06:22.070 with 06:25.460 --> 06:41.880 is five in the player separate height is two k so it's two rows for the height Zaine five columns with 06:41.880 --> 06:46.460 the width and scope and he's 06:51.180 --> 06:51.990 height. 06:51.990 --> 06:52.720 Is this 06:55.330 --> 07:01.440 and size that. 07:01.510 --> 07:04.970 Sorry that's OK. 07:07.350 --> 07:22.680 And I'm also going to set the position of the where and I'm actually going to make a new function for 07:22.680 --> 07:41.070 this stuff and I'm going to call it teach reset where it's where it's going to take the player in that. 07:41.220 --> 07:51.120 And the reason why I am doing this and also do is do more initialising but every time we kind of change 07:51.520 --> 07:58.230 I say to the next level we want to kind of recenter the player and put him in the initial spot and stuff 07:58.230 --> 07:59.270 like that. 07:59.640 --> 08:07.920 So we might need to call this a bunch of times unlike this nit player which we only will call once per 08:08.400 --> 08:09.130 game. 08:09.150 --> 08:09.860 Right. 08:10.260 --> 08:14.420 So I mean we don't really have to set his width and height every time. 08:14.430 --> 08:18.210 OK so we're going to say a reset player here. 08:24.200 --> 08:31.100 So and reset player will actually set where the player should be initially. 08:31.100 --> 08:39.940 So it's position X is going to be in actually going to. 08:40.430 --> 08:46.100 I'm going to need the game with stuffs because I need to center him properly. 08:46.100 --> 08:54.960 So in fact we have to do our first revision which is send in the games. 08:55.070 --> 08:58.040 So the second change 09:03.830 --> 09:11.120 animals to me to get here is wow I'm just putting the game first. 09:11.360 --> 09:18.170 Just because no reason way. 09:18.610 --> 09:19.590 Copy this 09:22.070 --> 09:23.850 there. 09:24.040 --> 09:26.050 Copy that and put it there. 09:26.740 --> 09:27.780 And then that player. 09:27.790 --> 09:30.300 I'm also going to pass in the game. 09:30.820 --> 09:40.070 So again the reason I need that is because when you do this so with a size Dortch 09:43.350 --> 10:05.190 the went over to minus the player dot the sprite size player that went over to Canute's this puts the 10:05.190 --> 10:11.030 player in center screen. 10:13.480 --> 10:22.040 Horizontal. 10:22.200 --> 10:29.540 And we're also going to put the player position. 10:30.120 --> 10:38.090 Why is what CH It will need to be at the bottom of the screen. 10:38.590 --> 10:46.590 OK but I want him to be one kind of row up from the screen at the bottom. 10:46.620 --> 10:53.460 So it's a game daunts window sized height. 10:53.490 --> 11:00.660 And I remember that it goes from 0 0 at the top left of the screen down. 11:00.690 --> 11:10.580 So you're going to have to take the height of the window minus the player sprite size 11:13.530 --> 11:20.140 dot hige OK so the heights can be two and the window size. 11:20.360 --> 11:23.830 Dr. Height is 30. 11:24.030 --> 11:29.770 So he'll be eight down minus 1. 11:29.790 --> 11:31.770 So that's kind of where he'll start. 11:33.510 --> 11:40.610 And you'll see you'll see what this really do a bit as gain here. 11:40.620 --> 11:42.410 So. 11:42.860 --> 11:51.910 So the other thing you need to do is get the players and the nation states in or at zero initially set 11:52.590 --> 12:00.340 and are also going to need to set the missile position as well. 12:00.340 --> 12:10.000 And we need to somehow say whether or not the missile is currently in play. 12:10.060 --> 12:18.610 So I'm actually going to make a couple of new constants or one new concept really. 12:19.440 --> 12:26.390 And I'm going to name it's not in play in a safe. 12:26.400 --> 12:40.000 Negative One copy this and I'm actually going to make a new function for this as well. 12:40.740 --> 12:47.580 And I'm going to call it void resets missile 12:50.060 --> 12:51.980 and give it player 12:56.200 --> 12:57.020 so. 12:57.520 --> 13:02.540 And what recent missile will do is actually take it out of play. 13:04.720 --> 13:12.790 So we're going to need this for when you hit an alien or hit shield or something like that or goes off 13:12.790 --> 13:14.200 screen. 13:14.410 --> 13:17.330 It's going to need to go out of play. 13:17.350 --> 13:30.190 So risk where Dot missile dot X is not les. 13:30.220 --> 13:38.540 And similarly with the y it's not it's play right because he hasn't shot yet. 13:38.550 --> 13:46.040 So this makes sense and in recent missile. 13:46.230 --> 13:48.930 So we haven't even drawn anything or done anything yet. 13:48.930 --> 13:53.730 We're just just initialize the player. 13:53.740 --> 13:56.120 And again that's it. 13:56.440 --> 14:06.890 OK so now let's actually do the main loop. 14:06.890 --> 14:16.990 So we have we've initialized the player and the game so to say you'll quit and do the same kind of thing 14:16.990 --> 14:21.390 that we did for a while not quit. 14:24.960 --> 14:33.840 What we're going to do is get the in touch or handle the input of the player. 14:33.840 --> 14:40.380 So we're going to need that function for this a handle input 14:43.400 --> 14:48.260 and maybe it'll pass back the input that you gave it. 14:50.900 --> 14:57.690 And I say we're a good game in order to get with the player. 14:58.950 --> 15:02.030 And you'll see why it's an SOS. 15:02.040 --> 15:02.960 Copy this 15:10.450 --> 15:19.240 this second copy it is a little input and turn that character. 15:19.300 --> 15:26.040 It's going to take a game. 15:26.560 --> 15:30.580 It can change the game at all but we might change the player 15:33.760 --> 15:34.300 so 15:39.990 --> 15:49.090 in which copy this piece down here we're not even really going to implement that. 15:49.170 --> 16:00.300 So I was going to do this now in declare clear input that we're going to implement yet. 16:00.590 --> 16:09.230 All really we're going to do from now on is try to get the player to draw in maybe move later. 16:09.350 --> 16:14.220 OK so we're going to have the player on the screen and maybe he'll move. 16:14.990 --> 16:18.000 So that's it for that for now. 16:18.080 --> 16:19.970 And we're going to do 16:24.850 --> 16:27.670 I guess we'll go where we'll do. 16:29.890 --> 16:33.630 Well one thing we haven't done is actually initially curse. 16:33.730 --> 16:37.680 So we should actually do that. 16:38.650 --> 16:45.640 Function is called Schley's versus So we could actually do this right away. 16:45.640 --> 16:50.580 True because we want Nodaway in our gets shut down 16:53.380 --> 16:54.390 curses here. 16:55.400 --> 16:55.960 OK. 16:56.450 --> 16:58.460 So go do that. 16:58.490 --> 17:00.850 It's very import. 17:00.910 --> 17:05.630 So now we will 17:08.140 --> 17:11.200 I guess for now we'll say update game 17:14.020 --> 17:21.190 and we'll pass the game and the player for now and we'll say clear the screen. 17:24.500 --> 17:29.450 And this comes from is used Hill's. 17:30.160 --> 17:43.730 And we'll say draw the game using the game and the player and say refresh the screen also from curses 17:43.920 --> 17:45.060 he tells. 17:45.330 --> 17:46.720 OK. 17:46.740 --> 17:58.920 So let's start implementing these a little bit so update game we're not going to implement really yet 17:58.970 --> 17:59.680 anyway. 18:00.750 --> 18:12.320 So soccer or anything in this I don't think we're going to change it but maybe that's not the case. 18:12.320 --> 18:18.860 We we might change the player and we're also going to need Drog game 18:22.600 --> 18:29.440 and we're definitely not going to change the game again and are not going to change. 18:31.180 --> 18:31.620 Damier 18:34.670 --> 18:42.790 OK so you'd have a lot of functions none of which really have been all implemented yet except for maybe 18:42.790 --> 18:43.780 the initialize ones 18:47.560 --> 18:52.470 so start implementing a little bit of it. 18:52.630 --> 18:57.770 So probably not going to implement a game yet. 18:59.530 --> 19:06.280 Says something to update we just want the player to kind of be on screen. 19:07.170 --> 19:14.930 So we don't have a sprite yet and this semicolon right there. 19:15.070 --> 19:16.800 We don't have a straight for the player. 19:16.810 --> 19:21.510 So let's actually go back and make him. 19:21.910 --> 19:23.560 Let's actually make this right. 19:29.400 --> 19:35.060 So let's call him that's going to accounts char star. 19:35.220 --> 19:35.680 Right. 19:35.700 --> 19:47.040 So Aski so I can call him player Spryte and he's going to be it's going to be an array and each element 19:47.040 --> 19:47.790 will be 19:50.450 --> 19:57.550 kind of see strings sort of and this will be his top it will be firsts. 19:57.640 --> 20:04.520 The top part of him and this will be the bottom that day. 20:04.760 --> 20:10.170 It's an array of character pointers. 20:10.220 --> 20:14.020 So now we have the player Spryte. 20:14.030 --> 20:25.750 So now we should ask into here and we're have to figure out how to draw the player. 20:27.750 --> 20:30.390 So how are we going to 20:33.140 --> 20:34.540 draw the player. 20:35.940 --> 20:46.040 Well in general Burgess going to need some way of drying sprite k. 20:46.370 --> 20:56.840 So I'm actually going to instead of drawing or having like draw sprite method in TX invader's actually 20:56.840 --> 21:00.140 going to put it in curses. 21:00.170 --> 21:06.410 This is kind of the missing function that I was kind of talking about before. 21:06.770 --> 21:12.320 So we're actually going to say void draw Spryte 21:14.760 --> 21:25.240 and redraw it at some positions exposition in y position and or indeed the Spryte self. 21:25.610 --> 21:31.100 Or star Spryte and are going to need the height of this right. 21:31.100 --> 21:35.060 Really this is kind of the length of the array. 21:37.440 --> 21:44.920 And I'm also going to add we're going to add an offset. 21:46.090 --> 21:50.910 Here and this is going to be for later. 21:50.980 --> 21:53.700 And actually going to make it the default parameter. 21:53.740 --> 21:55.580 So are you going there. 21:56.140 --> 21:56.710 Yeah. 21:57.050 --> 22:05.260 These kind of defaulted parameters and then defaulted to zero and you'll see why we need this function 22:05.260 --> 22:06.280 probably 22:09.740 --> 22:17.260 probably we're going to need this function later when we do this parameter later when we do aliens. 22:17.270 --> 22:27.390 But for now I'm going to leave it there to the Dutch CVP file for curses. 22:28.920 --> 22:33.800 Remerge the fault parameters we don't need to have the actual value here. 22:34.940 --> 22:47.320 So that and really what we're going to do for the draw Spryte is pretty simple screens say for each 22:47.320 --> 22:51.860 so inch each being the height height is less than 22:54.890 --> 22:55.870 Spryte height. 22:59.580 --> 23:00.850 Each plus plus. 23:00.950 --> 23:04.990 So it's going to go through each step go back to here. 23:06.540 --> 23:15.160 For each kind of row right height is in the rows we just kind of draw this string. 23:15.170 --> 23:15.650 OK. 23:16.680 --> 23:25.780 That's basically so act here. 23:25.980 --> 23:26.790 Say 23:31.630 --> 23:33.760 and just sit on. 23:35.310 --> 23:39.110 Grass say envied in the branch you 23:43.660 --> 23:49.640 say why position plus the height 23:52.010 --> 23:55.380 and the exposition. 23:55.620 --> 24:01.190 And we're going to say the Spryte of each 24:11.740 --> 24:24.810 Well actually we're going to do S. S. that and this present s actually means a C string. 24:25.240 --> 24:29.790 And this is actually what's called a format format string. 24:29.830 --> 24:34.780 So we actually have to give it the format string in order to draw it properly. 24:34.830 --> 24:35.460 OK. 24:35.980 --> 24:38.470 So just follow follow this. 24:38.470 --> 24:40.360 This just means string. 24:40.570 --> 24:44.780 So put a string in here and this is the string that we're going to put. 24:44.900 --> 24:46.720 OK that's it. 24:46.750 --> 24:49.320 And we'll deal with the offsets later. 24:49.410 --> 24:50.140 OK. 24:50.340 --> 24:52.890 It's not going to bother with yet. 24:52.960 --> 25:01.600 So now that we have something to draw the sprite Let's actually draw the player draw straight 25:05.660 --> 25:10.670 so and take the exposition 25:14.390 --> 25:16.020 in the y position. 25:22.480 --> 25:32.400 And the actual Spryte itself is going to say play or straight. 25:33.250 --> 25:45.860 And B and each so layered that Sprite sized right that 25:49.360 --> 25:52.420 so you truly are in 25:56.790 --> 25:57.570 was right. 25:57.610 --> 25:58.180 Right. 26:01.820 --> 26:14.450 Offset each. 26:14.650 --> 26:21.500 Now where did you draw this. 26:21.600 --> 26:21.960 I 26:25.710 --> 26:29.650 may have put in actual curses you do for some reason. 26:30.060 --> 26:30.670 OK. 26:30.740 --> 26:43.430 So let's make sure make sure I always still kind of like do this and remove all all your your old files 26:43.730 --> 26:46.330 sure that you're putting in the right one. 26:48.300 --> 26:52.020 So I think that's ok now. 26:52.900 --> 26:53.500 OK. 26:53.940 --> 26:57.050 So rest is averted are good. 26:57.280 --> 27:01.220 So now this work. 27:01.240 --> 27:08.000 So let's actually run this and see what happens. 27:11.330 --> 27:12.030 Exist 27:24.930 --> 27:30.680 missing missing that. 27:30.780 --> 27:38.090 So so there should be an array of const char stores. 27:38.100 --> 27:38.870 OK. 27:39.290 --> 27:42.570 So that's all that was. 27:42.570 --> 27:50.970 So now this Yes and look we have our player right. 27:51.080 --> 27:52.360 OK. 27:52.590 --> 27:57.860 So now that we actually have something drawing on the screen which is nice. 27:58.170 --> 28:02.170 Let's actually get to moving him. 28:02.320 --> 28:04.500 Let's close this 28:07.560 --> 28:13.160 and start implementing the handle inputs. 28:13.260 --> 28:30.910 So here now we basically want to do kind of a switch over the input and see what's and see kind of what 28:30.910 --> 28:34.630 was done by the player. 28:34.690 --> 28:35.090 OK. 28:35.170 --> 28:40.310 So I'm going to also say if you hit Q Then you want to quit. 28:40.480 --> 28:44.070 So we will say switch 28:47.770 --> 28:54.180 and we'll switch over the char. 28:54.300 --> 29:05.970 And in fact we'll say actually say it or not we don't want this to be a charge of this to be in this 29:08.170 --> 29:08.660 fact. 29:08.750 --> 29:11.340 This is all. 29:11.520 --> 29:15.400 And the reason again is for the Iraqis. 29:16.320 --> 29:27.360 So we'll say input schools get our char and get charges from the details. 29:27.600 --> 29:28.820 Curses. 29:28.940 --> 29:30.460 So it's details. 29:30.600 --> 29:34.840 But and we'll switch over it. 29:34.840 --> 29:36.620 So if it's. 29:36.850 --> 29:37.450 Q 29:40.050 --> 29:42.530 Then we'll just return 29:48.630 --> 29:51.810 the input like that. 29:52.710 --> 29:59.860 If it's the arrow key so take a look at this. 30:00.010 --> 30:01.570 And in fact I'm going to change this. 30:01.670 --> 30:02.380 AK 30:04.950 --> 30:05.810 for air. 30:05.830 --> 30:08.770 You want to keep consistent naming here. 30:14.100 --> 30:17.340 That flip in the right place. 30:18.030 --> 30:25.530 So if it's the actual arrow key and for now we're going to do left 30:28.310 --> 30:33.310 that will do something at. 30:33.560 --> 30:38.460 Or if it's right is something. 30:38.630 --> 30:43.200 So really it's going to be moved to the right to left. 30:44.450 --> 30:46.900 And that's it. 30:48.870 --> 30:49.800 So 30:52.590 --> 30:57.480 let's actually run this one more time to make sure that cue works. 30:57.540 --> 31:01.800 It doesn't because we haven't hooked up yet. 31:01.800 --> 31:03.540 So yeah in the mainland. 31:03.740 --> 31:06.790 So if 31:09.340 --> 31:16.200 not ch or if input is equal or not equal to Q 31:18.880 --> 31:20.530 and we'll do all this stuff 31:24.680 --> 31:26.590 otherwise. 31:28.450 --> 31:32.450 Quit schoolteacher k. 31:32.770 --> 31:33.880 So let's run this 31:36.610 --> 31:39.470 rescue and it it's good. 31:40.100 --> 31:40.700 So that's good. 31:40.700 --> 31:44.550 We can try the gaming time we want and keep. 31:44.610 --> 31:51.380 And now let's actually be able to move our character or our little player straight. 31:51.690 --> 31:54.960 So let's actually put a function here 31:57.900 --> 32:00.810 or a function to move our player. 32:00.810 --> 32:05.080 So let's actually down here. 32:05.490 --> 32:09.800 Say a void move. 32:09.840 --> 32:10.490 Player 32:12.990 --> 32:19.370 and I'm actually going to pass it the game and you'll see why in a second. 32:20.670 --> 32:28.890 In Pass player in I'm going to pass in some amount to move it by 32:33.680 --> 32:37.960 Put it down here or draw a game 32:41.140 --> 32:54.550 in and if they press left I want to move him in the negative direction and move where it passing the 32:54.550 --> 32:59.330 game player and move him by some amount. 32:59.360 --> 33:12.900 And again going to make a constant for this player Bentz MT CH and I'm going to make two for now. 33:14.300 --> 33:18.830 So it's going to kind of move too over to either direction. 33:22.240 --> 33:24.550 This is going to be negative for left 33:27.520 --> 33:31.060 and it's going to be positive or right. 33:34.370 --> 33:40.340 And so let's actually implement player 33:43.390 --> 33:50.130 so we want to move the player left and right but we don't ever want to go off the screen. 33:50.170 --> 33:52.670 So that's why I'm passing in the game. 33:52.740 --> 33:55.310 This game has the actual screen boundaries. 33:55.690 --> 34:06.730 So I say if player top position X because we can only move left or right really the player can't move 34:06.730 --> 34:16.450 up or down position X plus the player dot size or the sprite size 34:19.140 --> 34:24.340 dot width because how we're going to have our player. 34:24.480 --> 34:37.670 So if you kind of think of the player terms of his Sprite really is he's going to be like kind of this. 34:37.850 --> 34:39.690 This is going to be his top left. 34:39.940 --> 34:40.570 OK. 34:40.670 --> 34:46.410 So this is kind of is the left most part of this right. 34:46.460 --> 34:51.620 So his position is really kind of right here. 34:51.670 --> 35:06.280 Essentially it's position there so if his position plus the width of the Spryte plus the amount he's 35:06.290 --> 35:15.220 moving is greater than the game's gained much window size dot. 35:15.770 --> 35:17.290 Then he would be off the screen. 35:17.330 --> 35:17.760 Right. 35:20.900 --> 35:33.940 So instead we'll say layered position dot X is the game's state but the wind decides that it's with 35:34.850 --> 35:46.770 minus the player's sprite size. 35:46.810 --> 35:49.390 So this is essentially saying 35:52.750 --> 36:06.310 make sure player doesn't go off the screen to the right. 36:06.660 --> 36:18.550 And this is the rightmost position the player can be care. 36:18.710 --> 36:31.100 And then we'll have to do the same for the other side of the player Deitsch position dot X plus X is 36:31.100 --> 36:33.470 less than zero. 36:33.560 --> 36:35.600 So this means 36:39.430 --> 36:48.390 player is off screen to the left. 36:49.570 --> 36:52.030 Then make sure he's not 36:55.100 --> 36:56.730 set easier. 36:57.200 --> 37:12.160 Otherwise we can just put his position plus equals that the actual x and so let's move. 37:12.240 --> 37:16.560 And that. 37:16.630 --> 37:19.030 So there you go. 37:19.140 --> 37:21.300 So move left and right. 37:21.310 --> 37:28.780 So if I go all the way to the left it's hitting it's hitting this case. 37:29.250 --> 37:35.730 So if I keep I keep trying I'm holding the left arrow key right now and I can't move any more to the 37:35.730 --> 37:37.190 left. 37:37.710 --> 37:44.470 And if I do that for the right it's it's the top case here. 37:44.560 --> 37:45.040 OK. 37:45.040 --> 37:47.800 So his his position. 37:48.070 --> 37:56.060 You can think of it is right here that's what the player's position really is and it's this kind of 37:56.060 --> 37:58.220 top left position right here. 37:58.250 --> 38:00.720 So if he sort of. 38:00.980 --> 38:07.730 So if you take that position plus the width of this right which is five plus how much he would be moving 38:07.730 --> 38:08.830 which is two. 38:09.050 --> 38:10.010 In this case. 38:10.030 --> 38:18.570 Ok if that's greater then the window size with the right the whole size of the window right then makes 38:18.580 --> 38:24.330 sure that he's at the window size minus the sprite height. 38:24.330 --> 38:25.540 So right here. 38:25.830 --> 38:26.550 OK. 38:27.380 --> 38:30.240 So that's kind of what it's saying. 38:30.270 --> 38:35.700 So don't go off the right side and don't go off the left side in the next case. 38:35.790 --> 38:40.590 Otherwise you would ever just just move right. 38:41.010 --> 38:42.940 So there you go. 38:42.960 --> 38:47.690 We have our player moving back and forth in our game. 38:47.800 --> 38:54.720 So in the next lecture I want to make sure that he can shoot scores even.