WEBVTT 00:00.510 --> 00:07.970 Know that we have that play moving left and right let's also have when you do shoot. 00:08.450 --> 00:11.560 So in TX invader's h. 00:11.570 --> 00:13.480 Let's put another sprites in here. 00:13.520 --> 00:22.300 This is just going to be a regular Sprite or Chaar anyway in order to say Play your 00:24.880 --> 00:27.620 miso sprite 00:30.210 --> 00:34.410 that inj is going to be this vertical bar here. 00:34.530 --> 00:35.870 OK. 00:35.880 --> 00:49.120 So I have a nice play or missile and are going to make it so that the player can shoot ch. 00:49.140 --> 00:53.340 So how are we going to do that. 00:54.260 --> 01:05.360 So we're going to go into our next innovator's to BP and in this handle input first of all we should 01:05.360 --> 01:07.220 have this return and put 01:12.280 --> 01:26.610 it so and we have another case for the fire with the space bar like that and we'll make a function call 01:26.610 --> 01:35.010 players shoot that. 01:35.220 --> 01:40.250 It's clear the function of peer. 01:40.750 --> 01:42.990 It's not going to return anything. 01:44.800 --> 01:48.290 He didn't take place by reference 01:51.140 --> 01:51.620 so 01:56.460 --> 02:00.030 and implement the player shoots method here. 02:04.190 --> 02:17.480 And it's said in the description here that there can only have one missile shot on screen at a time. 02:17.900 --> 02:23.450 So that means that if the plane or missile 02:28.150 --> 02:29.760 is not in play 02:35.910 --> 02:43.730 right and I'm just using X here instead of y it doesn't really matter. 02:43.740 --> 02:45.250 These should be both. 02:45.330 --> 02:48.340 Both really should be non play. 02:49.040 --> 02:50.690 But either or. 02:50.910 --> 02:52.540 So I can do this as well. 02:52.540 --> 02:57.600 Player missile y is not in play. 02:59.830 --> 03:01.870 Ok then we can actually shoot 03:07.090 --> 03:10.930 then put it in the proper position and actually fire it. 03:10.930 --> 03:15.280 So what is the proper position. 03:17.260 --> 03:27.600 Well proper position is we're basically going to rerun this when it shoots it's actually going to appear 03:27.600 --> 03:29.120 right above the a. 03:29.340 --> 03:31.070 Wherever that is. 03:31.090 --> 03:35.430 And so if he was over here you'd shoot here. 03:35.440 --> 03:35.940 Right. 03:35.970 --> 03:37.440 So I went in. 03:37.450 --> 03:46.650 So you have the missile up here right above the A part case a part is his gun or missile launcher or 03:46.650 --> 03:47.610 whatever. 03:48.420 --> 03:49.020 So 03:52.110 --> 03:54.300 here then I will say play or die. 03:54.330 --> 03:57.310 Missile. 03:57.490 --> 04:03.100 Why is that paired up position. 04:04.120 --> 04:05.420 Why mine is one. 04:05.420 --> 04:12.620 So one row above the player. 04:12.810 --> 04:13.340 OK. 04:15.420 --> 04:37.210 And the exposition should be missile that X is the player position X plus the essentially the size Spryte 04:37.230 --> 04:38.470 size. 04:42.200 --> 04:48.780 But with over two. 04:49.410 --> 04:54.300 So we'll see his missile shot right there. 04:55.110 --> 05:02.440 And let's actually get it to draw the players missile as well. 05:02.760 --> 05:14.010 So inside of the draw game you should have a new function for this. 05:14.430 --> 05:18.210 I'm actually going to make a draw player as well. 05:21.270 --> 05:25.810 Players are going to have more than just he's 05:28.480 --> 05:30.270 just his regular sprite. 05:30.310 --> 05:38.750 It's going to have a bunch of stuff so draw player this in. 05:40.970 --> 05:41.950 Player 05:44.540 --> 05:45.500 here. 05:46.560 --> 05:50.500 And I'm also going to pass in his Sprite want to draw 05:54.570 --> 05:57.860 this is going to change some time. 06:01.100 --> 06:15.060 That's what he's got here he is exploding or something that well in take this inning and move this here. 06:15.320 --> 06:21.920 Staed instead hear him say draw player. 06:27.280 --> 06:31.520 In she's going to draw players. 06:37.490 --> 06:42.230 Now passed through the sprint. 06:43.810 --> 07:00.350 So in addition if the player datt missile thoughts and again doesn't really matter which we choose. 07:00.710 --> 07:05.310 If it's not equal it's not in play meaning it isn't. 07:08.700 --> 07:10.130 And I'm going to drop it. 07:10.160 --> 07:15.220 So I'm going to say draw character 07:21.270 --> 07:24.480 the player Giat 07:48.990 --> 07:58.040 write draw character player dot midsole dot X.. 07:58.150 --> 08:03.190 So we're using the youtoo curses utils draw character. 08:05.740 --> 08:16.520 Next year soz x is y and the actual player missile. 08:19.320 --> 08:20.200 Here. 08:22.200 --> 08:22.980 Populace 08:25.540 --> 08:25.990 that 08:29.160 --> 08:43.670 so now if I run this in I say that you can actually see my missile when it press the space. 08:43.860 --> 08:46.790 OK that doesn't work. 08:46.890 --> 08:51.110 Now they re redo it. 08:51.120 --> 08:51.740 Right. 08:51.850 --> 08:57.110 It's still in play and I am pressing SPACE and it doesn't do anything. 08:57.120 --> 08:58.660 It's still in play. 08:59.250 --> 09:04.600 So I need to be able to update this player missile. 09:07.540 --> 09:13.100 This so need to actually move across the screen. 09:13.650 --> 09:20.610 OK so let's implement that in. 09:20.700 --> 09:27.300 HALL That's Lloyd D. 09:28.850 --> 09:30.330 Ms. 09:32.210 --> 09:33.110 Player. 09:36.720 --> 09:41.240 Copy this. 09:41.420 --> 09:43.700 And here's some more. 09:43.890 --> 09:44.570 This whole 09:47.240 --> 09:49.310 so if the missile 09:54.880 --> 09:57.920 matter is not equal to not in play. 09:58.100 --> 09:59.120 So it is. 10:02.920 --> 10:08.140 Then we will actually update the missile itself. 10:08.140 --> 10:08.920 OK. 10:09.380 --> 10:16.880 So we'll need an actual speed for the missile. 10:17.090 --> 10:30.300 Another one speed we're slow speed and we'll say the missile speed is one. 10:30.310 --> 10:33.310 Now that's 10:35.960 --> 10:44.260 so square dot missile. 10:44.470 --> 10:44.980 Why. 10:44.980 --> 10:48.150 Right because it has to go vertically. 10:48.160 --> 10:53.450 Minus equals player disciples. 10:55.430 --> 10:57.200 I like that. 10:57.680 --> 11:07.120 And if the missile hits the top of the it's the top of the screen. 11:07.120 --> 11:16.130 So if he where da misfile Y is less than zero. 11:18.920 --> 11:22.660 Great or less than less than zero. 11:23.000 --> 11:34.100 So if it goes off the screen then we will reset the missile to be kind of not in play anymore. 11:35.280 --> 11:42.870 So now that we have this update missile we should call it an uptick in the 11:45.910 --> 11:47.180 SO. 11:47.560 --> 11:56.600 Claire K you know that we don't need the game here for how for the screen bounds because we know that 11:56.840 --> 12:00.830 it's 0 0 is the top so it's less than zero. 12:00.840 --> 12:03.710 That must be off the screen right. 12:03.810 --> 12:06.620 So we run this 12:09.620 --> 12:12.860 in we keep pressings. 12:12.880 --> 12:17.550 I can hear him pressing the space bar. 12:17.610 --> 12:20.730 You may notice that we don't really see anything. 12:20.730 --> 12:26.890 In fact we can kind of see something sometimes but it's so fast I can't make it out. 12:27.090 --> 12:27.880 OK. 12:28.260 --> 12:33.190 And that is because we are going too fast. 12:34.220 --> 12:36.560 K The loop is going too fast. 12:37.620 --> 12:42.020 So this loop is going too fast so move just like before. 12:42.020 --> 12:46.160 What we did was we kind of limited the frame rate. 12:46.230 --> 12:53.660 So here space we want to see time. 12:53.760 --> 13:02.000 So and you will want in our text invader's the frames per second. 13:03.370 --> 13:06.250 And we'll put it to be 20 for now. 13:08.660 --> 13:09.060 OK. 13:09.280 --> 13:23.040 So we'll want our clock t and we call this the last time that clock so 13:25.760 --> 13:36.250 and here we're going to say clock the current time 13:38.840 --> 13:54.150 is the clock ticks and we'll say clock DTG is current time minus the last time. 13:55.120 --> 13:59.630 So the current time we check the clock minus the last time. 13:59.710 --> 14:10.620 So if that is greater than the clocks per second at over 14:14.380 --> 14:16.510 the frames per second 14:20.740 --> 14:23.980 then we will actually have the 14:28.030 --> 14:38.120 and of course we have to also say last time was current time to save all the cycles. 14:40.190 --> 14:40.760 That 14:43.960 --> 14:44.280 OK. 14:44.330 --> 14:48.090 So we went over this before in the last sections. 14:48.380 --> 14:51.590 If you want the full explanation. 14:52.490 --> 15:01.120 So now if you read this in see a smooth missile that 15:05.310 --> 15:08.280 it's going off the screen and that can shoot again. 15:11.430 --> 15:12.420 D-Nice 15:15.100 --> 15:21.710 if I really jam on the spacewalks going I can make another one. 15:21.930 --> 15:24.550 So which is good. 15:24.610 --> 15:29.720 So now we're shooting a missile. 15:30.110 --> 15:34.780 So I want to in the next lecture I want to go over the.