Game Programming - Episode 18 - Controlling The Map

hey what's up guys my name is the Cho and welcome to episode 18 of game programming so yesterday we took a look at actually implementing the key Handler class or the keyboard class um which actually uh um we were able to print out true when we pressed the up arrow and false if it was released if it wasn't pressed so um today we're actually going to take a look at actually I guess putting this to use so now obviously we've got a way to actually um gather ke Inus and we can record them but how do we actually use this to animate our our tile our map um and what we'll do first is actually get rid of this um printing thing so we uh we don't we don't do that one one thing that you can actually do is um is actually do this right what you can do is you can actually scan through every single one um so like keys. length right every single one of this keys and what you can do is say if you know keys I uh is true right then what you can actually do is print um system.out do print line you can print the key that is press and this is just like for fun so we can see um which one we print so if we just type this real quick um and and do this what you'll get is oh make sure you print um the we won't exactly know which key but if you actually just print I you'll actually know what which key ID it is so if we print if we go uh up you can see that's key number 38 uh if we had if we hit W that's k87 a is 65 D is 68 s is 83 down is 40 left is 37 39 38 so 37 38 39 so left up right down is how it's rolling but yeah that's just like a little fun little thing um that you can do to actually find out the IDS of the Kee so in other words how this does as you can see we didn't actually get anything if I just open the console here we didn't actually get anything higher than 87 so in other words what I'm saying is 120 should probably be fine now notice if we had put this to 85 and we tried I think it was the wky right well first of all it crashed straight away and the reason it crashed was the up key the WK was simply above that as you can say it's the wky here is 87 and we limited it to 85 so that's a little more in- depth understanding onto why we put 120 here it yeah we just want to we just want to have enough enough variables here enough bullings in this array to actually store in for every every key on our keyboard okay now actually applying this now is um relatively simple all right if we go back into our game. Java class we see that we actually have access to the key class of course through our little um keyboard key uh declaration here now what we can do is we've currently got it moving through this and to actually have it move when we press the appropriate key we can simply type if key do up for our up key equals true right if ky. up um then let's just Yus minus right because that'll actually drag our map up and similarly if I just get rid of this we can do the same thing for all of our other little controls so key. down will be y ++ ky. left will be um x-- and k. WR will be x++ so if we uh if we launch this you'll see um that I'm just pressing the arrow keys now and you can see that our map is indeed moving now it looks like it's actually I can I can see it on my computer it's lagging like crazy even though we're at 2,000 FPS that's because of my screen recorder so if this turns out laggy if this if this turns out laggy for you guys on the video that's uh that's the screen recorder fa okay if you do it yourselves on your computer you should get no lag obviously we're 2,000 frames per second here um but yeah you can see that I'm actually able to uh move myself around the map to my pleasing um simply by adding you know a few lines of code so um so yeah and we can actually uh we can actually start to do something with this now so yeah um I hope you enjoyed this episode of game programming guys if you did please hit the like button and I'll see you guys tomorrow where we'll move on into creating our game actually one quick thing I want to address a lot of people seem to be asking if this game will be multiplayer now I did mention that this game will be like Realm of the Mad good and as you know Realm of the Mad God is multiplayer so yes this game that we're making here rain will be multiplayer okay the idea of the series is to create Realm of the Mad God from scratch simple as that I'm not even going to say a game like Realm of the Mad God because what we're going to do at first is basically create Realm of the Mad God from scratch then from there then from there you know we'll obviously modify it and and um do whatever whatever it is we need to do but one thing that I really wanted to stress real quick guys is that um I really want to involve you guys in this series so when we actually come to designing things and actually you know making core gameplay decisions I'll definitely um get you guys into this and make sure that you guys have a have a say in what you get taught I guess and what what this series really becomes so um yeah anyway that's that's episode which what episode was this uh 18 yep that's episode 18 of game programming guys hope you enjoyed if you did add it to your favorites hit the like button and I'll see you guys see you guys tomorrow with a brand new episode later guys [Music]