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Lesson-2.html
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Lesson-2.html
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<!DOCTYPE html>
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<title>Snake Game-Phaser</title>
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<span class="text-highlight">Game Development</span>
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<h1 class="doc-title"><i class="icon fa fa-paper-plane"></i>Game Development</h1>
<div class="meta"><i class="fa fa-clock-o"></i> Snake Game using Phaser</div>
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<section id="introduction-section" class="doc-section">
<h2 class="section-title">Drawing the Snake</h2>
<div class="section-block">
<p>As we mentioned earlier, the <b>Game state</b> is where the actual game play happens. This is also the place where we will draw the snake. Like we did with the Menu state, we need to register the <b>Game state</b> with the global game object in <b>main.js</b>.
<br>Here is how your code should look like:</p>
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<h2 class="section-title">main.js</h2>
<div id="step1" class="section-block">
<pre><code class="language-markup">
var game;
game = new Phaser.Game(600, 450, Phaser.AUTO, '');
game.state.add('Menu', Menu);
// Adding the Game state.
game.state.add('Game', Game);
game.state.start('Menu');
</code></pre>
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<h2 class="section-title">menu.js</h2>
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<p>We'll also want to add some code in <b>menu.js</b> to let us start the <b>Game</b> state when it is clicked. For this purpose, we will replace the sprite with a button. Adding a button is basically the same as adding a sprite, you only need to provide a function to be called when it is clicked.
<br>Here is the final <b>menu.js</b> code:</p>
<pre><code class="language-markup">
var Menu = {
preload : function() {
// Load all the needed resources for the menu.
game.load.image('menu', './assets/images/menu.png');
},
create: function () {
// Add menu screen.
// It will act as a button to start the game.
this.add.button(0, 0, 'menu', this.startGame, this);
},
startGame: function () {
// Change the state to the actual game.
this.state.start('Game');
}
};
</code></pre>
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<h2 class="section-title">game.js</h2>
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<p>We can now proceed with coding the <b>Game</b> state and drawing the snake. The structure is similar to the one of the Menu state.</p>
<pre><code class="language-markup">
var snake, apple, squareSize, score, speed,
updateDelay, direction, new_direction,
addNew, cursors, scoreTextValue, speedTextValue,
textStyle_Key, textStyle_Value;
var Game = {
preload : function() {
// Here we load all the needed resources for the level.
// In our case, that's just two squares - one for the snake body and one for the apple.
game.load.image('snake', './assets/images/snake.png');
game.load.image('apple', './assets/images/apple.png');
},
create : function() {
// By setting up global variables in the create function, we initialise them on game start.
// We need them to be globally available so that the update function can alter them.
snake = []; // This will work as a stack, containing the parts of our snake
apple = {}; // An object for the apple;
squareSize = 15; // The length of a side of the squares. Our image is 15x15 pixels.
score = 0; // Game score.
speed = 0; // Game speed.
updateDelay = 0; // A variable for control over update rates.
direction = 'right'; // The direction of our snake.
new_direction = null; // A buffer to store the new direction into.
addNew = false; // A variable used when an apple has been eaten.
// Set up a Phaser controller for keyboard input.
cursors = game.input.keyboard.createCursorKeys();
game.stage.backgroundColor = '#061f27';
// Generate the initial snake stack. Our snake will be 10 elements long.
// Beginning at X=150 Y=150 and increasing the X on every iteration.
for(var i = 0; i < 10; i++){
snake[i] = game.add.sprite(150+i*squareSize, 150, 'snake'); // Parameters are (X coordinate, Y coordinate, image)
}
// Genereate the first apple.
this.generateApple();
// Add Text to top of game.
textStyle_Key = { font: "bold 14px sans-serif", fill: "#46c0f9", align: "center" };
textStyle_Value = { font: "bold 18px sans-serif", fill: "#fff", align: "center" };
// Score.
game.add.text(30, 20, "SCORE", textStyle_Key);
scoreTextValue = game.add.text(90, 18, score.toString(), textStyle_Value);
// Speed.
game.add.text(500, 20, "SPEED", textStyle_Key);
speedTextValue = game.add.text(558, 18, speed.toString(), textStyle_Value);
},
update: function() {
// The update function is called constantly at a high rate (somewhere around 60fps),
// updating the game field every time.
// We are going to leave that one empty for now.
},
generateApple: function(){
// Chose a random place on the grid.
// X is between 0 and 585 (39*15)
// Y is between 0 and 435 (29*15)
var randomX = Math.floor(Math.random() * 40 ) * squareSize,
randomY = Math.floor(Math.random() * 30 ) * squareSize;
// Add a new apple.
apple = game.add.sprite(randomX, randomY, 'apple');
}
};
</code></pre>
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