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我只是一個初學者，這個代碼在互聯網上的某個地方，我只是想學習 這是一個蛇遊戲，我想用空格鍵盤暫停遊戲 我沒有知道如何暫停一個人請幫助Flash - 暫停遊戲ActionScript 3
import flash.ui.*;
public class Snake extends MovieClip
{
private var _Paused:Boolean = false
private var score, life, framesElapsed:Number;
private var p1speedX, p1speedY:Number;
private var spacePressed, readyToMove, gotoWin, gotoLose:Boolean;
private var left,right,up,down:Boolean;
private var snakes:Array;
private var mcFood:Food;
public function Snake()
{
}
//All Start Functions
public function startMenu()
{
stop();
btnStartGame.addEventListener(MouseEvent.CLICK, gotoStartGame);
btnHowToPlay.addEventListener(MouseEvent.CLICK, gotoHowToPlay);
}
public function startHowToPlay()
{
btnBack.addEventListener(MouseEvent.CLICK, gotoMenu);
}
public function startWin()
{
btnBack.addEventListener(MouseEvent.CLICK, gotoMenu);
}
public function startLose()
{
btnBack.addEventListener(MouseEvent.CLICK, gotoMenu);
}
public function startGame()
{
score = 0;
life = 3;
framesElapsed = 0;
p1speedX = 1; //snakek starts moving right
p1speedY = 0;
up = false;
down = false;
left = false;
right = false;
spacePressed = false;
readyToMove = false;
gotoWin = false;
gotoLose = false;
snakes = new Array();
//Create 1st body part of snake and push it into the array
var snakeHead = new SnakePart();
snakeHead.x = 400;
snakeHead.y = 300;
snakes.push(snakeHead);
addChild(snakeHead);
addEventListener(Event.ENTER_FRAME,update);
stage.addEventListener(KeyboardEvent.KEY_DOWN,keyDownHandler);
stage.addEventListener(KeyboardEvent.KEY_UP,keyUpHandler);
stage.focus = this;
}
//All Goto Functions
private function gotoStartGame(evt:MouseEvent)
{
btnStartGame.removeEventListener(MouseEvent.CLICK, gotoStartGame);
btnHowToPlay.removeEventListener(MouseEvent.CLICK, gotoHowToPlay);
gotoAndStop("game");
}
private function gotoHowToPlay(evt:MouseEvent)
{
btnStartGame.removeEventListener(MouseEvent.CLICK, gotoStartGame);
btnHowToPlay.removeEventListener(MouseEvent.CLICK, gotoHowToPlay);
gotoAndStop("howtoplay");
}
private function gotoMenu(evt:MouseEvent)
{
btnBack.removeEventListener(MouseEvent.CLICK, gotoMenu);
gotoAndStop("menu");
}
private function keyDownHandler(evt:KeyboardEvent)
{
if (evt.keyCode == Keyboard.A)
{
//1st Player Left Key
left = true;
}
else if (evt.keyCode == Keyboard.D)
{
//1st Player Right Key
right = true;
}
if (evt.keyCode == Keyboard.W)
{
//1st Player Up Key
up = true;
}
else if (evt.keyCode == Keyboard.S)
{
//1st Player Down Key
down = true;
}
if (evt.keyCode == Keyboard.SPACE)
{
spacePressed = true;
}
}
private function keyUpHandler(evt:KeyboardEvent)
{
if (evt.keyCode == Keyboard.A)
{
left = false;
}
else if (evt.keyCode == Keyboard.D)
{
right = false;
}
else if (evt.keyCode == Keyboard.W)
{
up = false;
}
else if (evt.keyCode == Keyboard.S)
{
down = false;
}
if (evt.keyCode == Keyboard.SPACE)
{
spacePressed = false;
}
}
public function update(evt:Event)
{
handleUserInput();
handleGameLogic();
handleDraw();
if (gotoWin)
triggerGoToWin();
else if (gotoLose)
triggerGoToLose();
}
private function handleUserInput()
{
//Handle player 1 position
//if player wants to move left but snake is not
//already moving right
if (left && (p1speedX != 1))
{
p1speedX = -1;
p1speedY = 0;
}
//if player wants to move right but snake is not
//already moving left
else if (right && (p1speedX != -1))
{
p1speedX = 1;
p1speedY = 0;
}
//if player wants to move up but snake is not
//already moving down
else if (up && (p1speedY != 1))
{
p1speedY = -1;
p1speedX = 0;
}
else if (down && (p1speedY != -1))
{
p1speedY = 1;
p1speedX = 0;
}
if (spacePressed)
readyToMove = true;
}
private function handleGameLogic()
{
if (!readyToMove)
return;
framesElapsed++;
//Update the new position of the snake's head
if (framesElapsed % 2 == 0)
{
//Update motion of the snake's body
for (var i = snakes.length - 1; i >= 1; i--)
{
snakes[i].x = snakes[i-1].x;
snakes[i].y = snakes[i-1].y;
}
if (p1speedX > 0)
{
snakes[0].x += 20;
}
else if (p1speedX < 0)
{
snakes[0].x -= 20;
}
else if (p1speedY > 0)
{
snakes[0].y += 20;
}
else if (p1speedY < 0)
{
snakes[0].y -= 20;
}
//Check for collisions between the snake and its own body
for (var i = snakes.length - 1; i >= 1; i--)
{
if ((snakes[0].x == snakes[i].x) &&
(snakes[0].y == snakes[i].y))
{
collided();
break;
}
}
}
//Check for collisions between the snake and the walls
if (snakes[0].y < 0)
{
collided();
}
else if (snakes[0].x > 800)
{
collided();
}
else if (snakes[0].x < 0)
{
collided();
}
else if (snakes[0].y > 600)
{
collided();
}
//Add new food items
if (mcFood == null)
{
//Create a new food item
mcFood = new Food();
mcFood.x = Math.random() * 700 + 50;
mcFood.y = Math.random() * 500 + 50;
addChild(mcFood);
}
//Check for collisions between food item and Snake
if (mcFood != null)
{
if (snakes[0].hitTestObject(mcFood))
{
//Add score
score += 100;
if (score >= 5000)
gotoWin = true;
removeChild(mcFood);
mcFood = null;
//Add a body
var newPart = new SnakePart();
newPart.x = snakes[snakes.length-1].x;
newPart.y = snakes[snakes.length-1].y;
snakes.push(newPart);
addChild(newPart);
}
}
}
private function handleDraw()
{
//Handle display
if (!readyToMove)
txtHitSpaceBar.visible = true;
else
txtHitSpaceBar.visible = false;
txtScoreP1.text = String(score);
txtLife.text = String(life);
}
private function triggerGoToWin()
{
clearGame();
removeEventListener(Event.ENTER_FRAME, update);
gotoAndStop("win");
}
private function triggerGoToLose()
{
clearGame();
removeEventListener(Event.ENTER_FRAME, update);
gotoAndStop("lose");
}
//Misc Functions
private function resetGame()
{
//remove all food
removeChild(mcFood);
mcFood = null;
//remove all of snake body except first
for (var i = snakes.length - 1; i >= 1; i--)
{
removeChild(snakes[i]);
snakes.splice(i,1);
}
//Center the snake's head
snakes[0].x = 400;
snakes[0].y = 300;
readyToMove = false;
}
private function clearGame()
{
//remove all food
if (mcFood != null)
{
removeChild(mcFood);
mcFood = null;
}
//remove all of snake body
for (var i = snakes.length - 1; i >= 0; i--)
{
removeChild(snakes[i]);
snakes.splice(i,1);
}
}
private function collided()
{
life -= 1;
if (life > 0)
resetGame();
else
gotoLose = true;
}
}
}//end class
//end package