The map, or level design, is expressed in an array of strings. This is just so we don't need to keep typing in the number, and also helps if we want to experiment later with different block sizes etc. We then create a constant for the size of each block on our grid. This will give us a blank canvas with a nice checkerboard pattern. On the first line we import the kaboom library, and then initialize the context by calling kaboom(). Replace the example code in main.js file with the following to create the game board: This takes away a lot of the hassle normally involved in loading and rendering maps. Kaboom.js has built-in support for defining game maps, using a text array and the function addLevel. This will define the edges of the board so that if the snake crashes into them, we can detect and end the game. ![]() To start, we can get our game board, or map drawn on the screen. Using Kaboom.js in Replit takes care of all the boilerplate initialisation code, as well as asset loading, so we can concentrate on writing the game logic and making game graphics and sound. Then we can connect up callback functions that act on these events. Kaboom.js also makes good use of JavaScript's support for callbacks instead of writing loops to read in keyboard input and check if game objects have collided (bumped into each other), Kaboom.js uses an event model, where it tells us when such an event has occurred. We'll explore these features and learn how they work by using some of them in our game. It has functionality to draw shapes and sprites (the images of characters and game elements) to the screen, get user input, play sounds, and more. Kaboom.js is a JavaScript library that contains many useful features to make simple in-browser games. Now, give this repl a name, like "snake-kaboom".Īfter the repl has booted up, you should see a main.js file under the "Scenes" section. Log into your Replit account and create a new repl. That's a lot to think about! Let's get started and create a project in Replit. A way to determine if the snake has eaten, or touched, the food.A way to randomly place the food on the screen.A way to determine if the snake has crossed over itself (or "bitten itself", as another analogy).A way to determine if the snake has gone out of bounds of the screen.A way to get steering directions from the player to the snake.A way to draw the blocks and move them on the screen.The food then re-appears at another random place on the screen.Ī few components we will need to build are: If the snake eats some food (a different type of block), it grows by 1 block. If the snake crosses itself, it also dies. It also has simple rules – when the snake touches the sides of the screen, it dies. Snake, at its core, is a series of blocks representing a snake moving around a grid, with the player controlling the direction. Let's think a bit about what we need to do. If you don't already have a Replit account, create one now. We'll use the Replit web IDE to create our version of Snake. In this tutorial, we'll implement Snake using Kaboom.js built into Replit Overview and Requirements It's also a great game to build when you are learning the basics of game making. In the most basic form, it's a super simple game, but still wildly entertaining. ![]() At the time, it was often the only game you'd find on a phone. Snake was an incredibly popular game, mostly remembered from 1990s era cell phones.
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