1 00:00:04,370 --> 00:00:05,900 ‫Hello and welcome. 2 00:00:05,900 --> 00:00:12,020 ‫We're going to be writing our first blueprint program in this lecture so that when we hit play, we 3 00:00:12,020 --> 00:00:15,410 ‫get messages printed to the screen. 4 00:00:15,410 --> 00:00:16,190 ‫Let's dive in. 5 00:00:17,690 --> 00:00:22,730 ‫You can think of programming in Blueprint, a little bit like wiring up an electrical circuit. 6 00:00:22,760 --> 00:00:27,470 ‫You have your different components and you can wire them up so that when a light switch is switched 7 00:00:27,470 --> 00:00:31,100 ‫on, then the light will switch on. 8 00:00:31,760 --> 00:00:34,670 ‫Now, because we're going to be introducing a lot of new concepts here. 9 00:00:34,670 --> 00:00:39,140 ‫I'm going to be building up a little bit of a glossary as we go now. 10 00:00:39,140 --> 00:00:44,900 ‫We saw at the end of the last lecture that this thing here is called the event graph. 11 00:00:44,930 --> 00:00:49,220 ‫It is the canvas on which we are going to be painting all of our blueprints. 12 00:00:50,150 --> 00:00:55,430 ‫And we also saw that we can right click on the event graph to get a list of functionality. 13 00:00:55,490 --> 00:01:02,060 ‫Now the first thing I want you to search for is print string, and you're going to see that there is 14 00:01:02,060 --> 00:01:03,200 ‫a menu item there. 15 00:01:03,200 --> 00:01:08,870 ‫It's under the heading development and if you click it, it brings in something that is called a node. 16 00:01:09,050 --> 00:01:17,380 ‫Now a node is a piece of pre-made functionality that we can drop in to our project and use from within. 17 00:01:17,390 --> 00:01:21,920 ‫Blueprint and a string is essentially programmer. 18 00:01:21,920 --> 00:01:23,960 ‫Speak for text. 19 00:01:23,960 --> 00:01:31,010 ‫So what we've got here is this node, when it's activated, will say hello. 20 00:01:31,010 --> 00:01:33,020 ‫We can change this to something else. 21 00:01:33,020 --> 00:01:38,600 ‫A message like Welcome to warehouse wreckage. 22 00:01:39,800 --> 00:01:45,800 ‫Now we might want this message to be displayed to the screen when we begin playing the game. 23 00:01:45,980 --> 00:01:48,740 ‫Now we can fortunately do this with another node. 24 00:01:48,740 --> 00:01:56,810 ‫If we right click, we can look for begin play and that brings up a menu item called Event Begin Play 25 00:01:56,810 --> 00:01:59,180 ‫and this brings in yet another node. 26 00:01:59,180 --> 00:02:06,170 ‫Now an event is just a special type of when node it tells us when something should happen. 27 00:02:06,170 --> 00:02:12,560 ‫And in this case, the Begin Play event tells us that something should happen when play begins, when 28 00:02:12,560 --> 00:02:14,210 ‫the play button is pressed. 29 00:02:14,210 --> 00:02:20,240 ‫Now, you may notice that these nodes have got these little arrows in on the left hand side or right 30 00:02:20,240 --> 00:02:21,800 ‫hand side, sometimes both. 31 00:02:21,800 --> 00:02:29,210 ‫These are known as pins, which are essentially sockets that we can connect up to each other. 32 00:02:29,210 --> 00:02:35,120 ‫There are input pins which are on the left and they tell us when to run this particular node. 33 00:02:35,120 --> 00:02:40,430 ‫And there are output pins that tell us what to do after this particular node. 34 00:02:40,430 --> 00:02:45,530 ‫So if we have a look at this, we've only got an output pin on the event, which makes sense because 35 00:02:45,530 --> 00:02:47,510 ‫we know that events are a when node. 36 00:02:47,510 --> 00:02:52,730 ‫They tell us when to do something and we've got inputs and outputs on the print string, which means 37 00:02:52,730 --> 00:02:59,330 ‫that we can tell it when it should start, which is the input, and then we can tell it what to do after, 38 00:02:59,330 --> 00:03:00,620 ‫which is the output. 39 00:03:00,620 --> 00:03:07,550 ‫So you can click and drag between these pins in either order to make a connection between the two. 40 00:03:07,550 --> 00:03:14,840 ‫And connections are literally just these wires between pins that allow us to connect up that when to 41 00:03:14,840 --> 00:03:15,440 ‫the what. 42 00:03:15,440 --> 00:03:22,520 ‫So in this case we're connecting up when we begin play, then you should print a string. 43 00:03:22,520 --> 00:03:23,690 ‫Let's try this out. 44 00:03:23,690 --> 00:03:29,150 ‫If you hit the play button in the toolbar, we should see a welcome to warehouse wreckage string being 45 00:03:29,210 --> 00:03:29,990 ‫printed. 46 00:03:29,990 --> 00:03:33,260 ‫Now the message doesn't hang around for very long, but that's okay. 47 00:03:33,260 --> 00:03:34,220 ‫We don't need it to. 48 00:03:34,220 --> 00:03:35,420 ‫It proves the point. 49 00:03:35,450 --> 00:03:35,690 ‫Now. 50 00:03:35,690 --> 00:03:40,760 ‫If you notice any background hissing while I'm playing the game, that's not my computer fans or background 51 00:03:40,760 --> 00:03:41,930 ‫noise in my room. 52 00:03:41,930 --> 00:03:47,900 ‫That's actually some ambient sound that is in our default level that is playing when we hit play. 53 00:03:47,900 --> 00:03:52,130 ‫If you hit play on your own project, try it out and switch on your speakers. 54 00:03:52,130 --> 00:03:53,840 ‫You're going to hear the same sound. 55 00:03:53,840 --> 00:03:59,990 ‫Now we can make sequences of nodes in the same way as we could connect multiple light bulbs up together 56 00:03:59,990 --> 00:04:06,500 ‫in a sequence, and that would allow us to do one thing and then something else. 57 00:04:06,500 --> 00:04:13,040 ‫So I'd like you to take the challenge of printing another message after our first one. 58 00:04:13,040 --> 00:04:17,180 ‫So add another print string node by right clicking and searching for it. 59 00:04:17,210 --> 00:04:25,310 ‫Connect it up in sequence with our first print string node and then customize the text to your liking 60 00:04:25,340 --> 00:04:27,200 ‫a pause video and have a go. 61 00:04:27,950 --> 00:04:29,330 ‫Okay, welcome back. 62 00:04:29,330 --> 00:04:36,620 ‫So let's exit play with an escape and then I'm going to show you that you can actually drag off the 63 00:04:36,620 --> 00:04:38,150 ‫output pin. 64 00:04:38,480 --> 00:04:44,870 ‫And then that brings up automatically a search box for you so you don't even have to right click and 65 00:04:44,870 --> 00:04:51,350 ‫then I can search for print string and that adds in a new print string node that is in sequence with 66 00:04:51,350 --> 00:04:52,160 ‫the previous one. 67 00:04:52,160 --> 00:04:57,800 ‫And I can say get ready to rumble. 68 00:04:58,550 --> 00:05:02,420 ‫And what that's going to do is if we hit play it prints. 69 00:05:02,680 --> 00:05:04,330 ‫Both of them at the same time. 70 00:05:04,330 --> 00:05:10,510 ‫Interestingly, the the oldest message goes at the bottom and then the newer one comes afterwards. 71 00:05:10,510 --> 00:05:14,580 ‫But as has happened in sequence, we've had one, then the other. 72 00:05:14,590 --> 00:05:18,730 ‫There's just no delay between the two because computers are really fast. 73 00:05:18,730 --> 00:05:21,070 ‫So make sure that you save your changes. 74 00:05:21,070 --> 00:05:25,000 ‫You can save all change files by doing a control shift. 75 00:05:25,000 --> 00:05:28,900 ‫SE and I will see you in the next lecture.