Programming a Tetris Game in C# - Full Guide 

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@@norbertabone9157 That's a shame. It works just fine on my end. Could you try again and see if it works now? Alternatively, try to go straight to www.patreon.com/OttoBotCode. You can find the Tetris code in the shop 😊

Brother do you want sail any project of c#

Bcz i need in emergency

​@@OttoBotCodeI see CS0122 Error. I don't know how to fix it. Thanks for advance. Here's the code: int dropDistance = gameState.BlockDropDistance();

Thanks, I appreciate it. More content coming soon😀

@@OttoBotCode What is the name of the data structure u used?

Thank you! I'm glad you like it 👍

I am glad you liked it, thanks for watching!

Thanks, I hear you. There will be more videos, this is just the beginning! At the moment, it's hard for me to find time for my videos, but that will change in 2 months time 😉

@@OttoBotCode Man all thanks to you sure I can't wait to see more !

Thank you so much!

@@OttoBotCode For real this is one of the best tutorial video's I've ever seen in my programming career love to see a new big channel at it's early stages of growing! I will do my best to share this content with everyone I know that loves this! I hope the best for you and wishes your channel a great growth in the near future :)

@@TeamROsky Awesome to hear. It is greatly appreciated, much more content coming soon!

@@OttoBotCode My teacher has send the other classes towards your video so they can do this as a task! Never expected that to happen but here you go :)

@@TeamROsky Wow super cool! Thanks again :)

For a beginner, this is too hard. It's more helpful for people who know properties, inheritance, basic collections, etc. If you know such things, following a tutorial like this one can help you get to the next level. I don't speed up the typing like I did for this video anymore, that's probably another reason why it's a bit hard to follow. Once you get more familiar with C# and you want to create a small project, definetely come back here (or perhaps check out my Snake tutorial) and give that a try. Thanks for your comment! 😊

the implementation is more math than code, hes good at explaining what each method does ur just not listening

@@BeenYT He said it himself that this is too hard for beginner. I guess "ur" just not reading...

​@@BeenYTBro is not reading💀

Thank you, that's great to hear! I'm working on the next project (also in C#) 😉

Thank you! 😃

Thank you! Awesome to hear 😃

Thank you so much for the kind words! When I program, I try my best to write clean and efficient code that's as easy to understand as possible. I have a masters degree in computer science, which is where I have a lot of my knowledge from. My coding style comes from a lot of hard work and passion for the field! 😊

Good luck with finishing your project. I'm glad this video was helpful 😊

Thank you for watching. Glad it was helpful

Glad you enjoyed it and thanks for the kind words!

Great to hear! Thanks for your comment 👍

It is possible but you would have to change the code to display your blocks correctly. Also keep in mind that your blocks will be chopped up when the player clears a row.

Thanks! I'd say this is an intermediate project but on the easy side 😉

Thanks for your comment 😊

You don't need to make it public, that's just how I was taught programming. Using "abstract" does make a lot of sense because we don't want the Block class to be instantiated directly (only the subclasses).

Thank you so much, really glad you like it!

Hello! I have a bachelor's degree in "Software Development" and a master's degree in "Computer Science" 😊 Whenever I find something that interests me, I like to try it myself and create some small project 😉 Great that you like this one!

Thanks!

Glad to hear you worked out in the end. Thanks for your comment!

I am glad that it helped you. Many games are easiest to implement using some kind of grid. Unfortunately, I am not familiar with dr.Mario, but best of luck with your project 😀

@@OttoBotCode thank you!

What you don't see in the video is the process of planning everything and structured the code to be as easy to understand as possible. There are design principles and standard patterns you can follow to some extent. That being said, there is no substitute for practice. With time you will develop a feel for what "good" code and "bad" code is. How important is math? That really depends on what you want to do. For most projects it's not so important in my opinion. It's more important to think logically and keep the code as simple as possible. BUT the really impressive programs like ray tracers, machine learning algorithms and game engines require a lot of math! 😉

Thanks for your comment and greetings from Denmark 😉

Thank you for the kind words. More content coming soon 😊

Sorry I completely missed your comment! The easiest way to add a pause feature would probably be to add a bool isGamePaused to MainWindow.xaml.cs. When the user presses P (or some other key) we set isGamePaused to true if it's currently false and vice versa. You also want to show something on the screen that indicates that the game is paused. When isGamePaused is true, we must make sure that: a) Pressing any key (except P) won't do anything. b) The current block doesn't move down. Stopping the current block from moving down can be a bit tricky, it requires modifying the game loop a bit. The easiest (but maybe not the prettiest) way would be to add a condition like this: if (!isGamePaused) { gameState.MoveBlockDown(); Draw(gameState); } That way each iteration of the game loop doesn't manipulate the GameState when the game is paused. Hope this makes sense and thank you for the kind words 😊

also no SRS kick table :(

It's around 10:45

Thanks for the kind words and the sub 😉 I did the animations for this video in After Effects. It was a little painful but it turned out well 😄

@@OttoBotCode Oh god, AFTER EFFECTS Do you think that I could do something like this in Unity?

​@@EchosongVV In some of my more recent videos I've been experimenting with programming the animations instead. Then I start the program and sceen record the animation. You can certaintly do something like that in Unity, but it also takes some work 😊

Thank you! Cool that you are trying to make it in Java. You should be able to write the game logic in a very similar way to what is in the video. I don't have much experience with UI in Java, but I wish you the best of luck 😀

Hello! It sounds like you are missing the GameCanvas_Loaded method in MainWindow.xaml.cs.

@@OttoBotCode true I fixed it but the program was just showing the canvas but it was still empty how do I fix that?

I would guess that your Position class is "internal" or "private". Make sure the Position class is "public". Inside Position.cs, the code should be: public class Position 😀

@@OttoBotCode Thank you very much!

You don't have to change any of the actual Tetris logic. All you have to do is rewrite the UI (the code in MainWindow.xaml and MainWindow.xaml.cs).

@@OttoBotCode great thank you, ill try to convert it any particular advice on what i could do? also great video btw i like how each function ,method and class is explained very helpful

My guess would be that the warnings disappear if you disable the "nullable" feature under project settings. It is a newer feature which is now enabled by default when you create a project. Its purpose is to help you avoid null reference exceptions by imposing additional constraints on your code. I did not follow these constraints. Don't worry about those warnings, the code will work just fine! For this project, I recommend disabling nullable under project settings. That should get rid of those annoying warnings! Best of luck with the tutorial 😊

Hello and sorry for the late reply! The grid array is a 2-Dimensional rectangular array (containing integers in our case). You can think of it as a grid or table of numbers. To access a specific element we must provide two indices - a row and a column. *r* and *c* are integer variables. When your code is running, they will store some integer value. *grid[r, c]* accesses the element at row *r* and column *c*. We can also change an entry like this: *grid[r, c] = 0* *grid[r + numRows, c]* is similar. Here we access the element at row (*r + numRows*) and column *c*. We just do a little addition inside the square brackets. I hope this helps and good luck with your programming journey 😀

@@OttoBotCode Thank you for the explanation!

You're welcome!

In this case *Rows = rows* and *Columns = columns* is the same as *this.Rows = rows* and *this.Columns = columns* *this* just refers to the current instance of the class. In the case above you don't have to add it explicitly but it is sometimes necessary. If the parameters in the constructor were also called *Rows* and *Columns* then we would have to do this: *this.Rows = Rows* and *this.Columns = Columns*. It does not imply that you can only create one instance of the class. We don't need it but you could create multiple instances of GameGrid. I hope this helps 😊

The hold and next fields display the Block-O.png image. On the playing field, an O-block is displayed using four instances of TileYellow.png. I suspect that Tile-Yellow.png is not loaded correctly in your project. Make sure that Tile-Yellow.png has build action set to "Resource" and double check that you have written the filename correctly in MainWindow.xaml.cs. Let me know if this resolves the issue! 😊

SetupGameCanvas populates a Canvas with Image controls, one for each cell in the GameGrid. If there is nothing in a given a cell (gameGrid[r, c] == 0), the source of the corresponding image is set to "Assets/TileEmpty.png". This image is just a dark gray border, with a transparent fill color. To give the cells a different color use one of these options: 1) Change the background color of the Canvas in the xaml code. 2) Change the TileEmpty.png image (this way will also allow you to change the color of the grid lines)

@@OttoBotCode Thank you very much , I understood . I have one more question that is the id variable in the Drawgrid method, it will always default to 0 right?

@@NguyenMinh-th2li The "IDs" are stored in an int array in the GameGrid class. The default value for int is 0. So yes, initially all IDs will be 0 by default.

@@OttoBotCode Thank you, I got it. Your project is very good to learn 😃😃

It's hard for me to guess what the issue is. The source code for the project is available here for 3$: www.patreon.com/OttoBotCode/shop. If that doesn't help you locate the mistake, then I can take a look at your project 😊

You're welcome 😃 Glad you liked it!

Wow, thank you so much! Glad you enjoyed it 🤩 Next video will be out next week 😃

@@OttoBotCode Job done sir 😌 5 added..

@@mrstickman6718 Awesome, thanks again!

You're welcome 😊

Can you send the project with the error to ottobotcodehelp@gmail.com? Then I'll figure out what is wrong 😉

I use a grid of image controls. When a block moves, the image sources are updated to reflect the new state of the game. It's all in the video if you ever feel like checking it out in depth 😉 I can't say why your program stutters without seeing your code.

@@OttoBotCode Ok thanks. I'll try that. Is there a way I could show you the code?

@@thesituation5315 You can send it to ottobotcodehelp@gmail.com. Then I'll take a look when I have the time 😃

You're welcome 😀

@@OttoBotCode Is it possible to add tetris song to this app? I know how to do it in Windows Forms app, but here the same code doesn't work :sob: I added the mp3 file to the Assets folder and changed the Build Action to Resource as for the images, but what do I do next? Thank you so much for your assistance. :hugging_face:

@@elenatrifonova5286 For the mp3 file. You have to set "Build Action" to "Content" and "Copy to Output Directory" to "Copy always". You can play the sound with the MediaPlayer class. MediaPlayer player = new MediaPlayer(); player.Open(new Uri("Assets/your_sound.mp3", UriKind.Relative)); player.Play();

@@OttoBotCode Super Mega LIKE to you, my friend! It can sing now :grin:

uh i didn't see public class prob solved

It sounds like your Position class is either "internal" or "private". Go to Position.cs and make the class "public" 😊

Does nothing happen when you press the arrow keys? Try setting a breakpoint in Window_KeyDown and then run the program in Debug mode. Then let me know if that breakpoint is hit when you press the arrow keys.

@@OttoBotCode tried that. And that is about the extent of my knowledge with debugging using visual studio features. And it did not trigger the breakpoint.

@@chadgessner4412 Okay so it seems like the event handler is not registered. I think the problem is in MainWindow.xaml. Do you have this property "KeyDown="Window_KeyDown" on the Window?

@@OttoBotCode I may have found something useful... My Window_KeyDown shows '0 references' above it, but yours shows 1. Maybe I missed a line of code somewhere?

@@OttoBotCode yes that was the problem. Thanks!

Thanks for buying the code. You should unzip the compressed file first and then open Tetris.sln with Visual Studio. Once opened, you can start the game by clicking the run button (green arrow) or pressing CTRL + F5. If that does not work, let me know what kind of error message you get! ☺

Thanks! 😉

Thanks for the nice comment 😊

Sorry for the late reply. If you are interested I can help you out. Send your entire project to me at ottobotcodehelp@gmail.com (zip or github link). I'll figure out what the problem is for you 😉

ok, i I tried manually inserting the green cell image, but when i start app, my canvas is empty

@@akainktsn It's probably not an issue with your code then. Make sure that your assets have "Build Action" set to "Resource"

What does the error message say?

@@OttoBotCode Actually, i solved that problem. But now i get a debug problem. It says debug does not exist.

Yes, I use it a little bit for the different blocks in the game.

I can find out if you send me your code. You can send it to ottobotcodehelp@gmail.com, then I'll take a look 😊

What does the warning say?

​@@OttoBotCode it says that "currentBlock" can't contain a Null value in the output, because it isn't nullable

One more thing: at 19:40 it says that KeyDown="Window_KeyDown"> is an error because it can be declared only on the left side of += or -= I'm using Visual Studio 2022

Great to hear ☺ CW = ClockWise CCW = CounterClockWise

Thank you!

I am not a Tetris expert but from what I can tell "lock delay" is the time it takes for a block to lock in place when it is on the ground (or on top of another block). The lock delay can be reset by moving/rotating the block but only a certain number of times. Correct me if that is wrong. There is a problem with the Game Loop used in this video. It's simplistic which makes it easy to implement but not very flexible. We could easily detect when a block is on the ground (or on top of another block) and do something like. await Task.Delay(lockDelay); Instead of the usual delay for moving the block down, but how would we change this delay when the user moves the block? I don't think there is an easy way to change the duration of Task.Delay after it has been started. For more advanced features like lock delay I recommend using a "proper" game loop that runs a certain number of times per second. With that, you can create variables for time based events like moving the block down (and locking it in place). Every time the loop runs (at each frame) you subtract the elapsed time from these variables and check if they are

@@OttoBotCode it really was, thank you. Awesome tutorial by the way, much more thorough than many other ones out there

@@SADDE Thank you 😃