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Game development

Load the assets and print them on screen

This is the 3rd step out of 16 of the Gamedev Phaser tutorial. You can find the source code as it should look after completing this lesson at Gamedev-Phaser-Content-Kit/demos/lesson03.html.

Our game will feature a ball rolling around the screen, bouncing off a paddle, and destroying bricks to earn points — familiar huh? In this article we'll look at how to add sprites into our gameworld.

Having a ball

Let's start with creating a JavaScript variable to represent our ball — add the following line between the game initialization code (our var game... block) and the preload() function:

var ball;

Note: for the sake of this tutorial we will use global variables. The purpose of the tutorial is to teach Phaser-specific approaches to game development rather than dwelling on subjective best approaches.

Loading the ball sprite

Loading images and printing them on our canvas is a lot easier using Phaser than using pure JavaScript. To load the asset, we will use the game object created by Phaser, executing its load.image() method. Add the following new line just inside the preload() function, at the bottom:

function preload() {
    // ...
    game.load.image('ball', 'img/ball.png');

The first parameter is the name we want to give the asset — this will be used across our game code, for example in our ball variable name, so we need to make sure it is the same. The second parameter is the relative path to the graphic asset. In our case we will load the image for our ball (note that the file name does not also have to be the same, but we'd recommend it, as it makes everything easier to follow.)

Of course, to load the image, it needs to be available in our code directory. Grab the ball image from Github, and save it in inside an /img directory in the same place as your index.html file.

Now, to show it on the screen we will use another Phaser method called add.sprite();  add the following new code line inside the create() function as shown:

function create() {
    ball = game.add.sprite(50, 50, 'ball');

This will add the ball to the game and render it on the screen. The first two parameters are the x and y coordinates of the canvas you want it added at and the third one is the name of the asset we defined earlier. That's it — if you load your index.html file you will see the image already loaded and rendered on canvas!

Compare your code

You can check the finished code for this lesson for yourself in the live demo below, and play with it to understand better how it works:

Next steps

Printing out the ball was easy; next we'll try moving the ball on screen.

Document Tags and Contributors

 Contributors to this page: chrisdavidmills, CheetahBongos, end3r, Yuri-Predborskiy
 Last updated by: chrisdavidmills,