adobe flash cs3錯誤1119：ball.vx顯示爲未定義的屬性

Question

這裏是我的代碼，使多個春天的動畫。但我得到這個錯誤。 ball.vx和ball.vy顯示爲未定義的屬性。

我試過Keith Peters的這段代碼「Foundation ActionScript 3.0 Animation Making Things Move！」

有誰知道如何解決它？

package 
{ 
import flash.display.Sprite; 
import flash.events.Event; 
public class Chain extends Sprite 
{ 
private var ball0:Ball; 
private var ball1:Ball; 
private var ball2:Ball; 
private var vx:Number = 0; 
private var vy:Number = 0; 
private var spring:Number = 0.1; 
private var friction:Number = 0.8; 
private var gravity:Number = 5; 

public function Chain() 
{ 
init(); 
} 
private function init():void 
{ 
ball0 = new Ball(20); 
addChild(ball0); 
ball1 = new Ball(20); 
addChild(ball1); 
ball2 = new Ball(20); 
addChild(ball2); 
addEventListener(Event.ENTER_FRAME, onEnterFrame); 
} 
private function onEnterFrame(event:Event):void 
{ 
moveBall(ball0, mouseX, mouseY); 
moveBall(ball1, ball0.x, ball0.y); 
moveBall(ball2, ball1.x, ball1.y); 
graphics.clear(); 
graphics.lineStyle(1); 
graphics.moveTo(mouseX, mouseY); 
graphics.lineTo(ball0.x, ball0.y); 
graphics.lineTo(ball1.x, ball1.y); 
graphics.lineTo(ball2.x, ball2.y); 
} 
private function moveBall(ball:Ball, 
targetX:Number, 
targetY:Number):void 
{ 
ball.vx += (targetX - ball.x) * spring; 
ball.vy += (targetY - ball.y) * spring; 
ball.vy += gravity; 
ball.vx *= friction; 
ball.vy *= friction; 
ball.x += ball.vx; 
ball.y += ball.vy; 
} 
} 
} 

Answer 1

我猜，你面臨這樣的問題：

Foundation ActionScript 3.0 Animation Making Things Move!源代碼的每個文件夾有Ball.as一些不同。 ch03，ch05 Ball.as沒有房產vx，vy。你應該導入CH06或上一級文件夾Ball.as他們有一個vx，vy如下：

package { 
    import flash.display.Sprite; 

    public class Ball extends Sprite { 
     public var radius:Number; 
     private var color:uint; 
     public var vx:Number = 0; 
     public var vy:Number = 0; 

     public function Ball(radius:Number=40, color:uint=0xff0000) { 
      this.radius = radius; 
      this.color = color; 
      init(); 
     } 
     public function init():void { 
      graphics.beginFill(color); 
      graphics.drawCircle(0, 0, radius); 
      graphics.endFill(); 
     } 
    } 
} 

Answer 2

，你能否告訴我們球類？可能vx和vx沒有聲明。