一个人打兵乓球——AS3新手学习例子
简陋之作，AS3新手学习例子。http://dl.dropbox.com/u/2877500/pinpang.swf
package {
import flash.display.*;
import flash.events.*;
import flash.filters.*;
import flash.text.*;
public class WarpSmash extends Sprite {
private var isGameOver:Boolean;
private var gameOverCount:int;
private const GAME_OVER_WAIT:int = 50;
private const SCREEN_W:int = 465;
private const SCREEN_H:int = 465;
private const PADDLE_OFFSET:Number = 25;
private var PADDLE_XS:Array = [ PADDLE_OFFSET, SCREEN_W - PADDLE_OFFSET ];
private const PADDLE_HX:int = 7;
private const PADDLE_HY:int = 50;
private var paddleX:Number = PADDLE_XS;
private var paddleY:Number;
private var side:int = 0;
private var teleporting:Boolean;
private var ballX:Number;
private var ballY:Number;
private var ballVX:Number;
private var ballVY:Number;
private var ballSpeed:Number;
private const BALL_RADIUS:Number = 7;
private var paddle:Shape = new Shape();
private var ball:Shape = new Shape();
private var score:int;
private var gameOverText:TextField;
private var scoreText:TextField;
private var instructionText:TextField;
private var colorMatrixFilter:ColorMatrixFilter = new ColorMatrixFilter(
[
1, 0, 0, 0, 0,
0, 1, 0, 0, 0,
0, 0, 1, 0, 0,
0, 0, 0, 1, 30
]
);
private var glowFilter:GlowFilter = new GlowFilter(0x00FF00, 1, 8, 8);
private var paddleFilters:Array = [ new BlurFilter(0, 0, 2), colorMatrixFilter, glowFilter ];
public function WarpSmash() {
function createText(x:Number, y:Number, fontSize:Number):TextField {
var tf:TextField = new TextField();
tf.defaultTextFormat = new TextFormat("Helvetica", fontSize, 0xFFFFFFFF);
tf.selectable = false;
tf.x = x;
tf.y = y;
return tf;
}
gameOverText = createText(225, 150, 23);
gameOverText.text = "GAME OVER";
gameOverText.autoSize = TextFieldAutoSize.CENTER;
gameOverText.visible = isGameOver;
addChild(gameOverText);
scoreText = createText(252, 300, 160);
scoreText.autoSize = TextFieldAutoSize.RIGHT;
addChild(scoreText);
instructionText = createText(248, 180, 23);
instructionText.text = "CLICK TO TELEPORT!";
instructionText.autoSize = TextFieldAutoSize.RIGHT;
addChild(instructionText);
var g:Graphics = paddle.graphics;
g.beginFill(0xFFFFFF);
g.drawRoundRect( -PADDLE_HX, -PADDLE_HY, PADDLE_HX * 2, PADDLE_HY * 2, 4, 4);
g.endFill();
addChild(paddle);
g = ball.graphics;
g.beginFill(0xFFFFFF);
g.drawCircle(0, 0, BALL_RADIUS);
g.endFill();
ball.filters = [ glowFilter ];
addChild(ball);
initGame();
addEventListener(Event.ENTER_FRAME, enterFrameHandler);
stage.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownHandler);
}
public function initGame():void {
ballSpeed = 20;
score = 0;
scoreText.text = "0";
side = 0;
paddleX = PADDLE_XS;
teleporting = false;
setPaddleBlur(0);
ballX = SCREEN_W;
ballY = random(SCREEN_H * 0.1, SCREEN_H * 0.9);
ballVX = -ballSpeed;
ballVY = 0;
isGameOver = false;
}
private function setPaddleBlur(blur:Number):void {
paddleFilters.blurX = blur;
paddle.filters = paddleFilters;
}
private function enterFrameHandler(event:Event):void {
if (teleporting) {
var d:Number = (PADDLE_XS - paddleX) * 0.2;
d += sign(d) * 4;
if (Math.abs(PADDLE_XS - paddleX) < d) {
paddleX = PADDLE_XS;
setPaddleBlur(0);
teleporting = false;
} else {
paddleX += d;
setPaddleBlur(Math.abs(d * 0.65));
}
}
paddleY = clamp(mouseY, PADDLE_HY, SCREEN_H - PADDLE_HY);
if (!isGameOver) {
if (!teleporting) {
if ((ballVX < 0 && side == 0 && ballX + ballVX < PADDLE_XS + PADDLE_HX) ||
(ballVX > 0 && side == 1 && ballX + ballVX > PADDLE_XS - PADDLE_HX)) {
if (Math.abs(ballY - paddleY) > PADDLE_HY + BALL_RADIUS * 0.8) {
isGameOver = true;
gameOverCount = 0;
} else {
ballSpeed = clamp(ballSpeed + 0.2, 0, 15);
ballVX = -sign(ballVX) * ballSpeed;
ballVY += random( -ballSpeed, ballSpeed);
ballVY = clamp(ballVY, -ballSpeed, ballSpeed);
score = clamp(score + 1, 0, 9999);
scoreText.text = String(score);
}
}
}
if (!inRange(ballX, -BALL_RADIUS, SCREEN_W + BALL_RADIUS)) {
isGameOver = true;
gameOverCount = 0;
}
} else {
gameOverCount++;
}
if (!inRange(ballY + ballVY, BALL_RADIUS, SCREEN_H - BALL_RADIUS)) {
ballVY = -ballVY;
}
ballX += ballVX;
ballY += ballVY;
paddle.x = paddleX;
paddle.y = paddleY;
ball.x = ballX;
ball.y = ballY;
gameOverText.visible = isGameOver && (gameOverCount > GAME_OVER_WAIT);
}
private function mouseDownHandler(MouseEvent:Event):void {
side = 1 - side;
teleporting = true;
if (gameOverText.visible) {
initGame();
}
instructionText.visible = false;
}
private function random(n:Number, m:Number):Number {
return n + Math.random() * (m - n);
}
private function sign(n:Number):Number {
if (n > 0) { return 1; }
if (n < 0) { return -1; }
return 0;
}
private function clamp(n:Number, min:Number, max:Number):Number {
if (n < min) { n = min; }
if (n > max) { n = max; }
return n;
}
private function inRange(n:Number, min:Number, max:Number):Boolean {
return (n >= min && n <= max);
}
}
}
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