Initial commit

js/snake.class.js

@@ -0,0 +1,101 @@
+/**
+ * Snake class
+ */
+var Snake = function(game) {
+	this.game = game;
+	this.length = 3;
+	this.justEaten = 0;
+	this.nextDirection = 'up';
+	this.previousDirection = 'up';
+	this.locations = [];
+	for (var i = 0; i < this.length; i++) {
+		this.locations[i] = [Math.floor(game.grid.width / 2), Math.floor(game.grid.height / 2) + i];
+	}
+}
+
+Snake.prototype.changeDirection = function(direction = '') {
+	if (direction !== '') {
+		switch (this.previousDirection) {
+			case ('up'):
+				this.nextDirection = (direction === 'down' ? this.nextDirection : direction);
+				break;
+			case ('down'):
+				this.nextDirection = (direction === 'up' ? this.nextDirection : direction);
+				break;
+			case ('left'):
+				this.nextDirection = (direction === 'right' ? this.nextDirection : direction);
+				break;
+			case ('right'):
+				this.nextDirection = (direction === 'left' ? this.nextDirection : direction);
+				break;
+		}
+	}
+}
+
+Snake.prototype.move = function() {
+	if (!this.game.paused && !this.game.gameover) {
+		switch (this.nextDirection) {
+			case ('up'):
+				var newX = this.locations[0][0];
+				var newY = this.locations[0][1] - 1;
+				break;
+			case ('down'):
+				var newX = this.locations[0][0];
+				var newY = this.locations[0][1] + 1;
+				break;
+			case ('left'):
+				var newX = this.locations[0][0] - 1;
+				var newY = this.locations[0][1];
+				break;
+			case ('right'):
+				var newX = this.locations[0][0] + 1;
+				var newY = this.locations[0][1];
+				break;
+			default:
+				break;
+		}
+		this.previousDirection = this.nextDirection;
+		
+		if (newX > this.game.canvas.width) {
+			newX = 1;
+		}
+		if (newX < this.game.canvas.width) {
+			newX = this.game.canvas.width - 1;
+		}
+		if (newY > this.game.canvas.height) {
+			newY = 1;
+		}
+		if (newY < this.game.canvas.height) {
+			newY = this.game.canvas.height - 1;
+		}
+		
+		var effect = this.game.resources.checkLocation(newX, newY);
+		if (effect !== null) {
+			this.game.applyEffect(effect);
+		}
+		
+		for (var i = 0; i < this.locations.length; i++) {
+			if (this.locations[i][0] === newX) {
+				for (var i = 0; i < this.locations.length; i++) {
+					if (this.locations[i][0] === newX && this.locations[i][1] === newY) {
+						this.game.end();
+					}
+				}
+			}
+		}
+		
+		if (this.justEaten > 0) {
+			this.justEaten--;
+		} else {
+			this.game.canvas.setTile('board', this.locations[this.locations.length - 1][0], this.locations[this.locations.length - 1][1]);
+			this.locations.splice(this.locations.length - 1, 1);
+		}
+		
+		this.locations.unshift([newX, newY]);
+		this.game.canvas.setTile('snake', this.locations[0][0], this.locations[0][1]);
+	}
+}
+
+Snake.prototype.embiggen = function(count) {
+	this.justEaten = count;
+}