Game Programming - Episode 8 - The Screen Class

Key Takeaways

hey what is up guys My Name Is AO welcome to episode 8 of game programming okay so last time we talked about buffet image and pixels and how um how you know we'd get the raster to actually uh upload uh pixel data to our buffer and intern um displayed onto the screen so we didn't actually change anything we still had this black um screen so what we're going to do today is actually talk about how we are going to manipulate those pixels so we've created a way to actually write to those pixels but how are we going to write to them and that's what we're going to cover today so first thing I'm going to do is actually create a new class so over here on our rain um folder I'm just going to right click hit new and click class and I'll just name it screen now I usually call this class screen and essentially what it is is our screen it's our class that actually displays our pixels that's all it does it just fills pixels in with colors that we specify so I'm going to name it screen you can also name it render I've called it render in the past as well I'm calling it screen hit finish um and this new class is going to have a few different uh things first of all um it's going to actually have a width and a height so private int width and we're not going to add anything to it and we also want private int height now instead of typing it out on two lines because you can see that they are both private integers we could just get rid of this and put a comma um dividing them and create them on one line so we're creating two variables on one line and again the name the names that we're specifying are being divided by this comma um now we're not going to uh we're we're actually going to set values to them um cuz we don't need to at the moment the other thing that I'm going to do is actually create a public int and this is going to be an array um and I'll just call it pixels and I'm not I'm not actually going to set anything to that as well we're not creating it yet so these two things this is going to be the width and the height of our screen and then this is going to be the array that contains all of our pixel data what I'm going to do what I'm going to do now is actually create a Constructor for them so public screen and it's going to take two parameters width and height both integers and I'll explain all this in a minute don't worry um and what I'm simply going to say here is that this do width equals width and this do height equals height okay so what are we doing here what we're doing here is if we go back to our um game class and actually create this screen object so right under running I'm just going to type private screen screen and again we're referring to our screen object and actually what I want to do is actually put that into a new package I'm actually going to put it into a sub package or a subfolder called graphics so if I just name Graphics here in the package and then actually you know move screen to that declaration you'll see that we've got a new folder here called graphics and this folder is going to contain all our classes that actually deal with graphics and stuff like that um and if I go here you'll see that it doesn't know where where screen is so we actually have to import it because it's in a different package than the game class so we'll import that and if we go over here when we want to create it and hit up screen equals new screen oops and we'll actually do this above the jframe right right over here um we actually need to enter parameters into it and the only things that we're going to enter is the width and height so we'll simply type width and height and again this refers to this width and this height so what's happening here essentially is we're creating a new instance of screen all right a new screen object and this do width equals width means that it's actually going to make this width over here equal to our parameter equal to whatever we put over here whatever whatever we put over here and same with height it's going to make this height in this in this screen class equal to this height which is this height so it's making width equal 300 and height equal width ID 16 * 9 um the thing we'll do is we'll actually create the pixel array now so we'll just type pixels equals new int and width times Hye okay so that's all that's all we're doing okay um to sum up this episode because I've got so much work over this weekend that I'm just not having time at all for this um what we've done today is we've created a screen class and we've actually instantiated that screen class as you can see we've set it equal to new screen we've created a new instance of a screen we've created a screen for ourselves and we've applied we've applied the size of our screen to these two variables so that we can now actually deal with the with um with these variables in our actual screen class and then tomorrow when we actually go on to rendering things by using pixels you'll um you'll be able to see how that works but what we've also done we we've created an array of pixels an array an array of inges which is the size of width time height so in other words we've created one integer for each pixel in our game okay we've created one integer for each pixel that is in our in our screen in our game so yeah tomorrow we'll move on to actually drawing um the uh pixels onto the screen the individual pixels onto the screen and we'll see if we can create something cool just to demonstrate the the power of this power of this game Manion so yeah I'm I'm sorry for the short episode guys but I've got to go so yeah hope you like the video if you did please hit the like button it uh it lets me know that you that you guys are actually enjoying this you know and um I'll see you guys tomorrow [Music] bye