ActionScript 3 Snake - actionscript-3

Question

Im trying to get a two player version of Snake running but i am having trouble getting the second snake to work, player 1 plays with w,a,s and d while player 2 uses the arrow keys. Player 1 with w,a,s and d is working player 2 with the arrows does not. Instead the arrow keys control player 1 as well as w,a,s and d.I think it has to do with the onEnterFrame function but i've been starring at it for days and i cannot see anything. Im fairly new to ActionScript as well so some hints to point me in the right direction is all i need, Thanks!
package{
import flash.display.MovieClip;
import flash.events.KeyboardEvent;
import flash.ui.Keyboard;
import flash.events.Event; //used for ENTER_FRAME event
public class Main extends MovieClip{
const speed:int = 5;//speed of the snake
var vx:int;
var vy:int;
var gFood:Food;
var gFood2:Food2;
var head:SnakePart;
var head2:SnakePart2;
var SnakeDirection:String;
var Snake2Direction:String;
var snake:Array;
var snake2:Array;
public function Main(){
init();
}
function init():void {
//Initialize everything!
vx = 1; vy = 0;
snake = new Array();
snake2 = new Array();
SnakeDirection = "";
Snake2Direction = "";
//add food to the stage
addFood();
addFood2();
//add snakes head to the stage
head = new SnakePart();
head.x = stage.stageWidth/2;
head.y = stage.stageHeight/2;
snake.push(head);
addChild(head);
head2 = new SnakePart2();
head2.x = stage.stageWidth/14;
head2.y = stage.stageHeight/25;
snake2.push(head2);
addChild(head2);
stage.addEventListener(KeyboardEvent.KEY_UP , onKeyUp);
stage.addEventListener(KeyboardEvent.KEY_DOWN , onKeyDown);
addEventListener(Event.ENTER_FRAME , onEnterFrame);
//ENTER_FRAME listener is attached to main class and not to the stage directly
}
//This function will add food to the stage
function addFood():void {
gFood = new Food();
gFood.x = 50 + Math.random()*(stage.stageWidth-100);
gFood.y = 50 + Math.random()*(stage.stageHeight-100);
addChild(gFood);
}
function addFood2():void {
gFood2 = new Food2();
gFood2.x = 50 + Math.random()*(stage.stageWidth-100);
gFood2.y = 50 + Math.random()*(stage.stageHeight-100);
addChild(gFood2);
}
//this function will reset the game
function reset():void {
removeChild(gFood);
addFood();
head.x = stage.stageWidth/2;
head.y = stage.stageHeight/2;
vx = 1;vy = 0;
removeChild(gFood2);
addFood2();
head.x = stage.stageWidth/4;
head.y = stage.stageHeight/4;
vx = 1;vy = 0;
for(var i = snake.length-1;i>0;--i){
removeChild(snake[i]);
snake.splice(i,1);
}
}
function onKeyDown(event : KeyboardEvent) : void {
//handle player 1
if (event.keyCode == Keyboard.A) {
SnakeDirection = "a";
} else if (event.keyCode == Keyboard.D) {
SnakeDirection = "d";
} else if (event.keyCode == Keyboard.W) {
SnakeDirection = "w";
} else if (event.keyCode == Keyboard.S) {
SnakeDirection = "s";
}
//handle player 2
if (event.keyCode == Keyboard.LEFT) {
Snake2Direction = "left";
} else if (event.keyCode == Keyboard.RIGHT) {
Snake2Direction = "right";
} else if (event.keyCode == Keyboard.UP) {
Snake2Direction = "up";
} else if (event.keyCode == Keyboard.DOWN) {
Snake2Direction = "down";
}
}
function onKeyUp(event : KeyboardEvent) : void {
//handle player 1
if (event.keyCode == Keyboard.A || event.keyCode == Keyboard.D || event.keyCode == Keyboard.W || event.keyCode == Keyboard.S) {
SnakeDirection = "";
}
//handle player 2
if (event.keyCode == Keyboard.LEFT ||event.keyCode == Keyboard.RIGHT || event.keyCode == Keyboard.UP || event.keyCode == Keyboard.DOWN) {
Snake2Direction = "";
}
}
function onEnterFrame(event:Event):void {
//setting direction of velocity
if(SnakeDirection == "a" && vx != 1) {
vx = -1;
vy = 0;
}else if(SnakeDirection == "d" && vx != -1) {
vx = 1;
vy = 0;
}else if(SnakeDirection == "w" && vy != 1) {
vx = 0;
vy = -1;
}else if(SnakeDirection == "s" && vy != -1) {
vx = 0;
vy = 1;
}
//setting direction of velocity
if(Snake2Direction == "left" && vx != 1) {
vx = -1;
vy = 0;
}else if(Snake2Direction == "right" && vx != -1) {
vx = 1;
vy = 0;
}else if(Snake2Direction == "up" && vy != 1) {
vx = 0;
vy = -1;
}else if(Snake2Direction == "down" && vy != -1) {
vx = 0;
vy = 1;
}
//collison with stage
if(head.x - head.width/2 <= 0){
reset();
}
if(head.x + head.width/2 >= stage.stageWidth){
reset();
}
if(head.y - head.height/2 <= 0){
reset();
}
if(head.y + head.height/2 >= stage.stageHeight){
reset();
}
//move body of the snake
for(var i = snake.length-1;i>0;--i){
snake[i].x = snake[i-1].x;
snake[i].y = snake[i-1].y;
}
for(var i = snake2.length-1;i>0;--i){
snake2[i].x = snake2[i-1].x;
snake2[i].y = snake2[i-1].y;
}
//changing the position of snake's head
head.x += vx*speed;
head.y += vy*speed;
//collision with tail
for(var i = snake.length-1;i>=1;--i){
if(snake[0].x == snake[i].x && snake[0].y == snake[i].y){
reset();
break;
}
}
for(var i = snake2.length-1;i>=1;--i){
if(snake2[0].x == snake2[i].x && snake2[0].y == snake2[i].y){
reset();
break;
}
}
//collision with food player 1
if(head.hitTestObject(gFood)){
removeChild(gFood);
addFood();
var bodyPart = new SnakePart();
bodyPart.x = snake[snake.length - 1].x;
bodyPart.y = snake[snake.length - 1].y;
snake.push(bodyPart);
addChild(bodyPart);
}
if(head.hitTestObject(gFood2)){
removeChild(gFood2);
addFood2();
var bodyPart = new SnakePart();
bodyPart.x = snake[snake.length - 1].x;
bodyPart.y = snake[snake.length - 1].y;
snake.push(bodyPart);
addChild(bodyPart);
}
//collision with food player 2
if(head.hitTestObject(gFood)){
removeChild(gFood);
addFood();
var bodyPart = new SnakePart2();
bodyPart.x = snake2[snake2.length - 1].x;
bodyPart.y = snake2[snake2.length - 1].y;
snake2.push(bodyPart);
addChild(bodyPart);
}
if(head.hitTestObject(gFood2)){
removeChild(gFood2);
addFood2();
var bodyPart = new SnakePart2();
bodyPart.x = snake2[snake2.length - 1].x;
bodyPart.y = snake2[snake2.length - 1].y;
snake2.push(bodyPart);
addChild(bodyPart);
}
}
}
}

Answer 1

First,let me explain your mistakes in this code:
1.You have the same vx and vy for both snakes !! this means both snakes should go parallel and to the same direction !!
2.and problem 1 won't happen because you set head.x and y but not head2 for the other snake!
Just for being careless... :)
so:
1.add variables vx2 and vy2 for the poor second snake !
2.replace the second setting direction of velocity with this:
if(Snake2Direction == "left" && vx2 != 1) {
vx2 = -1;
vy2 = 0;
}else if(Snake2Direction == "right" && vx2 != -1) {
vx2 = 1;
vy2 = 0;
}else if(Snake2Direction == "up" && vy2 != 1) {
vx2 = 0;
vy2 = -1;
}else if(Snake2Direction == "down" && vy2 != -1) {
vx2 = 0;
vy2 = 1;
}
3.do anything you left for the second snake.(head2.x and y,collision for second snake, etc)
I  H☺P E  this helps !