Object-Oriented Game Development

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We can then learn more as we progress. As long as you understand that we can design a class which acts like a blueprint and that we can create objects from that blueprint that actually use that code then you know enough to proceed. I will fully explain what is happening when we design some classes and create objects from them.

It just so happens that SFML is stuffed full of classes and functions that cover just about everything we will ever need to make a 2d game. JohnHornton You may wish to double check the code in class Paddle, specifically the movePaddleLeft function. Firstly, great tutorials.

Is that a typo or am I missing something? Also, inside the constructor you have position. Hi Dave, Thanks for taking the time to write the comment, I really appreciate it. Both points are my mistakes and I have put them right to make it clear to future readers. Build 6 cool games:.

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Object-oriented programming (OOP), in its most basic sense, is a programming style used to organize code. Video games can run anywhere. In this course, we remake the 2D Side Shooter game that we made previously, only this time with Object Oriented principles in mind. I do my best to cover a very .

Related Posts. James D'Alton May 5, at am - Reply. John Horton May 9, at pm - Reply. Many thanks James. Dave June 25, at am - Reply. Hi John, Firstly, great tutorials. John Horton June 25, at pm - Reply. Really appreciate it! Leave A Comment. In that case, I would advise that you design the data that needs to be synchronised between all the clients, and store that in a single class e.

This object will handle all the synchronisation between different PCs as well as allowing your local code to request changes to the data. It will then "drive" the game objects Player, EnemyTank, etc from its own state. By keeping it all in one place it makes it much easier to do this, and encourages you to only put the absolute essentials in that class so that your comms don't become bloated with unnecessary data].

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If you're not doing multiplayer, and you find that changing the player's position needs to update multiple objects e. So you move the player, and the camera gets a callback telling it that the player's position has been updated. Another approach for this would be that the camera simply reads the player's position every frame in order to updaet itself - but this isn't as loosely coupled and flexible as using events. Sometimes the trick to OOP is understanding what is an object, and what is functionality of an object. I think its often pretty easy for us to conceptually latch onto objects like Player, Monster, Item, etc as the "objects" in the system and then we need to create objects like Environment, Transporter, etc to link those objects together and it can get out-of-control depending on how the concepts work together, and what we need to accomplish.

The really good engineers I have worked with in the past have had a way of seeing systems as collections of objects. Sometimes in one system they would be business objects like item, invoice, etc and sometimes they would be objects that encapsulated processing logic DyeInjectionProcessor, PersistanceManager which cut across several operations and "objects" in the system. In both cases the metaphors worked for that particular system and made the overall process easier to implement, describe, and maintain.

The real power of OOP is in making things easier to express and manage in large complex systems. These are the OOP principles to target, and not worry as much whether it fits a rigid object hierarchy. I havent worked in game design, so perhaps this advice will not work as well, in the systems I do work on and develop it has been a very beneficial change to think of OOP in terms of simplification and encapsulation rather than 1 real world object to 1 OOP class.

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I'd like to expand on GrayWizardx's last paragraph to say that not all objects need to have the same level of complexity. On the other hand, it is important to remember that objects can represent tasks or collections of tasks rather than real-world entities.

graphumuzovop.cf For example, a player object might not be responsible for moving the player, but instead representing its position and current state. A PlayerMovement object might contain logic for changing a player's position on screen or within the game world. They might provide some high-level guidelines for creating a good object model for a game. Use Stack Overflow for Teams at work to find answers in a private and secure environment.

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What is OOP?

That's fine when you work alone. Unity Unity Services Implementation via Coursera. With games, you might consider the logic of how things work—the game mechanic—to be procedural, facilitating the object-oriented action that moves the narrative along. It becomes an implementation detail that only the typed object has to worry about. Learn More.

Object Oriented application problems in game development Ask Question. Asked 9 years, 9 months ago. Active 9 years, 9 months ago. Viewed 2k times. StackOverflow is not well suited to answering this type of question. As you observe, OO programming has turned out to be pretty succesful, so I suggest resolving your issues with it by reading a few books and writing some code.

If any of these directly addresses this topic, please let me know. I've looked through them several times and haven't seen anything substantive. But none of them are really about OO. It's unusual nowadays to find someone that doesn't "get" the advantages of OO - my own codse has always been written in an OO style and I've been doing it for 30 years now so I'm probably not the right person to ask for a book recommendation, but I've always liked Grady Booch's stuff.

Well I've also read Object Oriented programming with Java, so I understand all the terminology behind OO practices, and even read design patterns for dummies. I get all of that, but none of them address this what I would consider core issue with OOP. Tom Dalling Tom Dalling Thanks for that tip. Anton N Anton N 1 1 gold badge 4 4 silver badges 8 8 bronze badges. Yeah, this is similar to what I'm doing right now.

It just doesn't really feel like that should be the best solution. I can't explain it. No, in my example World class can't move Player at all. Player moves herself with the walk method you invoke walk method not from the World, but from UI.

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And World can only prevent player from walking to illegal position it's only for example, you can implement your own logic of how player's walking interacts with the world , by listening to Player's "walk" events. Dested Dested 2, 11 11 gold badges 47 47 silver badges 69 69 bronze badges. It would be OO still, but it still seems to me at least that the player class just ends up being a huge series of getters and setters. Imagine attacking a player. I would have to have a method like player.

Or possibly do this: player.

OOP Is Dead, Long Live Data-Oriented Design

In this case, no way to send update over network though. Aviad P. In this case, whether it was a service or not actually instantiating these objects example: Player , the Player object would still need a reference to the service assuming it isn't static so that it can call upon those functions. Doesn't that then tightly couple the Player object to the service object?

In that case warp would be tightly coupled with the service. Is this even acceptable OO practice? By having your objects use an interface for a service, and instantiating the actual service object independently you achieve decoupling. Since you can replace the actual service implementation anytime. Of course, the interface needs to remain the same, but coupling is measured against implementations not against interfaces.

Dec 26 '09 at By keeping it all in one place it makes it much easier to do this, and encourages you to only put the absolute essentials in that class so that your comms don't become bloated with unnecessary data] If you're not doing multiplayer, and you find that changing the player's position needs to update multiple objects e. Jason Williams Jason Williams In your example, storing all game related data in a single class GameState, I would still need to define functions within that class to do all the process I would need on my objects like Player.

Data is more important than code

This would still create duplicate functions and have all my classes end up being data structures. From what I can tell in your post, you're defining an API of functions from that one class to operate on all the data, correct? You might still store the data in the individual objects, but whenever you want to move the Player, you would ask the GameState to update it, rather than asking the player directly.

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You can also enforce this usage by making the Player methods private, but friends of the GameState, so it is the only class that can change them.