Talking about Game development, HTML5, Javascript, Phaser and TypeScript.
When you develop cross platform HTML5 games, you have to keep in mind that a lot of people will play them using different systems: computers, tablets and smartphones, each one with is own control system.
Computer players will play with either keyboard or mouse, while mobile players will play using touch controls.
I am showing you how to handle, with only a single script, all possible input controls in a game controlled by left or right buttons, just like my Serious Scramblers prototype.
Look at the script in action:
You can control the “game”, which consinst in highlighting left and right halves of the canvas, with A or D keys, ARROW keys, Mouse or multitouch inputs.
If you have a mobile phone, you can access the result directly at this link or through this QRCode:
The example is built around one HTML and two TypeScript files, let’s see them in detail:
index.html
The webpage which hosts the game, just the bare bones of HTML.
Also look at the thegame div, this is where the game runs.
<!DOCTYPE html>
<html>
<head>
<script src = "main.js"></script>
</head>
<body>
<div id = "thegame"></div>
</body>
</html>
main.ts
The main TypeScript file, the one called by index.html.
Here we import most of the game libraries and define Scale Manager object.
Here we also initialize the game itself.
// MAIN GAME FILE
// modules to import
import Phaser from 'phaser';
import { PlayGame} from './playGame';
// object to initialize the Scale Manager
const scaleObject: Phaser.Types.Core.ScaleConfig = {
mode: Phaser.Scale.FIT,
autoCenter: Phaser.Scale.CENTER_BOTH,
parent: 'thegame',
width: 500,
height: 500
}
// game configuration object
const configObject: Phaser.Types.Core.GameConfig = {
type: Phaser.AUTO,
scale: scaleObject,
scene: [PlayGame]
}
// the game itself
new Phaser.Game(configObject);
playGame.ts
The core of the examples, in playGame class we make all stuff work and handle various types of user input
// THE GAME ITSELF
// this class extends Scene class
export class PlayGame extends Phaser.Scene {
// just a debug text to print some info
debugText: Phaser.GameObjects.Text;
arrowKeys: Phaser.Types.Input.Keyboard.CursorKeys;
// variable to be assigned to keyboard key "A"
keyA: Phaser.Input.Keyboard.Key;
// variable to be assigned to keyboard key "B"
keyD: Phaser.Input.Keyboard.Key;
// flag to check if any left button has been pressed
leftPressed: boolean;
// flag to check if any right button has been pressed
rightPressed: boolean;
// flag to check if the mouse has been pressed
mousePressed: boolean;
// variable to store mouse X position
mouseX: number;
// left and right tilesprites to show highlighted directions
leftHighlight: Phaser.GameObjects.TileSprite;
rightHighlight: Phaser.GameObjects.TileSprite;
// variable to quickly store game half width and height, as we are going to use them a lot of times
halfGameWidth: number;
gameHeight: number;
// constructor
constructor() {
super({
key: 'PlayGame'
});
}
// method to be called once the class preloads
preload(): void {
// load the dotted line image
this.load.image('line', 'assets/dotted.png');
// load highlight image
this.load.image('highlight', 'assets/highlight.png');
}
// method to be called once the class has been created
create(): void {
// get half game width and height
this.halfGameWidth = this.game.config.width as number / 2;
this.gameHeight = this.game.config.height as number;
// at the beginning of the game the mouse is not pressed
this.mousePressed = false;
// place left highlight tile sprite
this.leftHighlight = this.add.tileSprite(0, 0, this.halfGameWidth, this.gameHeight, 'highlight');
this.leftHighlight.setOrigin(0, 0);
// place right highlight tile sprite
this.rightHighlight = this.add.tileSprite(this.halfGameWidth, 0, this.halfGameWidth, this.gameHeight, 'highlight');
this.rightHighlight.setOrigin(0, 0);
// add the dotted line tilesprite and set its registration point
this.add.tileSprite(this.halfGameWidth, 0, 4, this.gameHeight, 'line').setOrigin(0.5, 0);
// initialize arrow keys
this.arrowKeys = this.input.keyboard.createCursorKeys();
// add to keyA keyboard input with "A" key
this.keyA = this.input.keyboard.addKey(Phaser.Input.Keyboard.KeyCodes.A);
// add to keyD keyboard input with "D" key
this.keyD = this.input.keyboard.addKey(Phaser.Input.Keyboard.KeyCodes.D);
// normally Phaser only handles one pointer, so we have to add one more pointer to handle multi touch
this.input.addPointer(1);
// mouse event listeners
this.input.on('pointerdown', this.setMousePressed, this);
this.input.on('pointerup', this.setMouseReleased, this);
this.input.on('pointermove', this.getMousePosition, this);
// just a debug text
this.debugText = this.add.text(16, 16, '', {
color: '#ffffff',
fontFamily: 'monospace',
fontSize: '18px'
});
}
// method to be called when the mouse is pressed
setMousePressed(pointer: Phaser.Input.Pointer): void {
// mouse is pressed
this.mousePressed = true;
// save horizontal mouse position
this.mouseX = pointer.x;
}
// method to be called when the mouse is released
setMouseReleased(): void {
// mouse is not pressed
this.mousePressed = false;
}
// method to get mouse position
getMousePosition(pointer: Phaser.Input.Pointer) {
// save horizontal mouse position
this.mouseX = pointer.x;
}
// method to be executed at each frame
update(): void {
// at the start of each frame, we assume both right and left buttons aren't pressed
this.leftPressed = false;
this.rightPressed = false;
// report text to output at the end of the process
let reportText: string = "";
// is mouse pointer pressed
if (this.mousePressed) {
// is mouse pointer horizontal position greater than half the canvas width?
if (this.mouseX > this.halfGameWidth) {
// right button is being pressed
this.rightPressed = true;
// update report text
reportText += "Mouse on right side\n";
}
else {
// left button is being pressed
this.leftPressed = true;
// update report text
reportText += "Mouse on left side\n";
}
}
// is touch pointer1 down?
if (this.input.pointer1.isDown) {
// is pointer1 horizontal position greater than half the canvas width?
if (this.input.pointer1.x > this.halfGameWidth) {
// right button is being pressed
this.rightPressed = true;
// update report text
reportText += "Pointer1 on right side\n";
}
else {
// left button is being pressed
this.leftPressed = true;
// update report text
reportText += "Pointer1 on left side\n";
}
}
// is touch pointer2 down?
if (this.input.pointer2.isDown) {
// is pointer2 horizontal position greater than half the canvas width?
if (this.input.pointer2.x > this.halfGameWidth) {
// right button is being pressed
this.rightPressed = true;
// update report text
reportText += "Pointer2 on right side\n";
}
else {
// left button is being pressed
this.leftPressed = true;
// update report text
reportText += "Pointer2 on left side\n";
}
}
// is "A" key down?
if (this.keyA.isDown) {
// left button is being pressed
this.leftPressed = true;
// update report text
reportText += "'A' key pressed\n";
}
// is "D" or key down?
if (this.keyD.isDown) {
// right button has been pressed
this.rightPressed = true;
// update report text
reportText += "'D' key pressed\n";
}
// is left arrow key down?
if (this.arrowKeys.left.isDown) {
// left button is being pressed
this.leftPressed = true;
// update report text
reportText += "'LEFT' key pressed\n";
}
// is right arrow key down?
if (this.arrowKeys.right.isDown) {
// right button has been pressed
this.rightPressed = true;
// update report text
reportText += "'RIGHT' key pressed\n";
}
// make left highlight visible if left direction has been pressed
this.leftHighlight.setVisible(this.leftPressed);
// make right highlight visible if right direction has been pressed
this.rightHighlight.setVisible(this.rightPressed);
// prompt final result
this.debugText.setText("Overall Left: " + this.leftPressed.toString() + "\nOverall Right: " + this.rightPressed.toString() + "\n-----------------\n" + reportText);
}
}
This example only covers left and right input, with virtual buttons rather than virtual pads, but it’s quite easy to extend it and turn it into a virtual four movement multicontrol script. Download the source code.
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