Building a Mine Sweeper Game using Dart's Flutter Framework (Part 3)

What Will I Learn?

• You will learn how to programmatically reveal parts of our game board
• You will learn how to change the state for our flags and our covered tiles
• You will learn how to give tiles numbers based their layout on the board and how many mines are nearby
• You will learn how to structure game logic and state in a flutter application

Requirements

• IDEA intellij or Visual Studio Code with the Dart/Flutter Plugins
• The Dart SDK and the Flutter SDK
• A fair understanding of Mobile development and Imperative or Object Oriented Programming

Difficulty

• Intermediate

Description

In this third video tutorial, we build out most of the internal logic that drives the game state for our minesweeper game. This includes building functions that allow us to manipulate the elements on the board and the board itself. We also use the flutter framework's widget pattern to our advantage to make this application function in a way that is intuitive and preformant.

We create two helper functions. The first helper function allows us to determine if a tile is on the board or not. This is important for some of the other functions to work properly. We also build a function called bombs which lets use return a one or zero depending upon whether or not there is a bomb in a tile. We use this bomb function inside of our next function which is called mine count. The mine count function counts the mines that are adjacent to the tiles on our board and then outputs this amount. We use this function to generate the numbers for our tiles.

The next function we create is called flag. This function handles the state change from a covered tile to a flagged tile. This allows a user to flag a covered tile and remove the flag from a flagged tile. The open function is probably the most interesting function in this tutorial. It allows us to check to see if a tile is on the board, then it checks to see what that tiles state is. Afterwards, it checks to see if the tile has a mine count that is above zero. After these checks are executed, the function then recursively calls itself on every tile around the tile that was selected by the user. This is the function that allows the user to tap on a tile that isn't near a mine and open up the board. Finally, we add a function that allows us to check to see if the user has clicked on a mine or not. If not, then we run the open function.

We then wire all of these functions up to our board by putting them into our gesture detector. The counter is also put at the top of our build board function so that it is run on each tile as it is generated. While we do not have a failure state or a win state for our game just yet, we can now click on any tile and reveal the numbers, mines or blank tiles underneath of them. We can also flag the tiles when they are still covered.

The source code for this project can be found here

The freeware minesweeper game that we keep referring too can be found here

Video Tutorial

Curriculum

Related Series Tutorials

• Building a Mine Sweeper Game using Dart's Flutter Framework (Part 1)
• Building a Mine Sweeper Game using Dart's Flutter Framework (Part 2)

Projects and Series

Stand Alone Projects:

• Dart Flutter Cross Platform Chat Application Tutorial
• Building a Temperature Conversion Application using Dart's Flutter Framework

Building a Calculator

• Building a Calculator Layout using Dart's Flutter Framework
• Finishing our Calculator Application with Dart's Flutter Framework

Movie Searcher Application

• Building a Movie Searcher with RxDart and SQLite in Dart's Flutter Framework (Part 1)
• Building a Movie Searcher with RxDart and SQLite in Dart's Flutter Framework (Part 2)
• Building a Movie Searcher with RxDart and SQLite in Dart's Flutter Framework (Part 3, Final)

Curriculum

• Building a Multi-Page Application with Dart's Flutter Mobile Framework
• Making Http requests and Using Json in Dart's Flutter Framework
• Building Dynamic Lists with Streams in Dart's Flutter Framework
• Using GridView, Tabs, and Steppers in Dart's Flutter Framework
• Using Global Keys to get State and Validate Input in Dart's Flutter Framework
• The Basics of Animation with Dart's Flutter Framework
• Advanced Physics Based Animations in Dart's Flutter Framework
• Building a Drag and Drop Application with Dart's Flutter Framework
• Building a Hero Animation and an Application Drawer in Dart's Flutter Framework
• Using Inherited Widgets and Gesture Detectors in Dart's Flutter Framework
• Using Gradients, Fractional Offsets, Page Views and Other Widgets in Dart's Flutter Framework
• Making use of Shared Preferences, Flex Widgets and Dismissibles with Dart's Flutter framework
• Using the Different Style Widgets and Properties in Dart's Flutter Framework
• Composing Animations and Chaining Animations in Dart's Flutter Framework
• Building a Countdown Timer with a Custom Painter and Animations in Dart's Flutter Framework
• Reading and Writing Data and Files with Path Provider using Dart's Flutter Framework
• Exploring Webviews and the Url Launcher Plugin in Dart's Flutter Framework
• Adding a Real-time Database to a Flutter application with Firebase
• Building a List in Redux with Dart's Flutter Framework
• Managing State with the Scoped Model Pattern in Dart's Flutter Framework

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Posted on Utopian.io - Rewarding Open Source Contributors

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