Flash繪制旋轉的3D效果菜單動畫

 　　演示：

　　≯全屏顯示或下載≮

　　1、新建Flash文件,設置寬、高屬性為 550 × 400 。

　　2、用圓角矩形工具，畫一個 158 × 35的長方形。筆觸為8白色，填充色#0 F7E 88。圖1：

　　3、將長方形轉換成名為 Menu Item 的影片剪輯。設定注冊點為中心。圖2：

　　4、雙擊舞台上的影片剪輯，進入編輯狀態。創建動態文本，在它裡面輸入需要的本文。圖3

　　5、在屬性面板中輸入實例名字 menuItemText 。

　　6、按下字符嵌入按鈕，插入下列字型。圖4：

　　7、切換回主場景1，刪除舞台上的影片剪輯，實例將由代碼生成。

　　8、打開庫元件面板，右鍵單擊影片剪輯，(CS3選鏈接、CS4選屬性)給元件添加一個綁定類。類名 MenuItem 。圖5：

　　9、選中第1幀，打開動作面板輸入代碼：

　　復制內容到剪貼板代碼:

　　//The total number of menu items

　　const NUMBER_OF_ITEMS:uint = 20;

　　//This array will contain all the menu items

　　var menuItems:Array = new Array();

　　//Set the focal length

　　var focalLength:Number = 350;

　　//Set the vanishing point

　　var vanishingPointX:Number = stage.stageWidth / 2;

　　var vanishingPointY:Number = stage.stageHeight / 2;

　　//We calculate the angleSpeed in the ENTER_FRAME listener

　　var angleSpeed:Number = 0;

　　//Radius of the circle

　　var radius:Number = 128;

　　//Calculate the angle difference between the menu items (in radians)

　　var angleDifference:Number = Math.PI * (360 / NUMBER_OF_ITEMS) / 180;

　　//This loop creates and positions the carousel items

　　for (var i:uint = 0; i < NUMBER_OF_ITEMS; i++) {

　　//Create a new menu item

　　var menuItem:MenuItem = new MenuItem();

　　//Calculate the starting angle for the menu item

　　var startingAngle:Number = angleDifference * i;

　　//Set a currentAngle attribute for the menu item

　　menuItem.currentAngle = startingAngle;

　　//Position the menu item

　　menuItem.xpos3D = - radius * Math.cos(menuItem.currentAngle) * 0.5;

　　menuItem.ypos3D = radius * Math.sin(startingAngle);

　　menuItem.zpos3D = radius * Math.cos(startingAngle);

　　//Calculate the scale ratio for the menu item (the further the item -> the smaller the scale ratio)

　　var scaleRatio = focalLength/(focalLength + menuItem.zpos3D);

　　//Scale the menu item according to the scale ratio

　　menuItem.scaleX = menuItem.scaleY = scaleRatio;

　　//Position the menu item to the stage (from 3D to 2D coordinates)

　　menuItem.x = vanishingPointX + menuItem.xpos3D * scaleRatio;

　　menuItem.y = vanishingPointY + menuItem.ypos3D * scaleRatio;

　　//Assign an initial alpha

　　menuItem.alpha = 0.3;

　　//Add a text to the menu item

　　menuItem.menuItemText.text = Menu item + i;

　　//We don’t want the text field to catch mouse events

　　menuItem.mouseChildren = false;

　　//Assign MOUSE_OVER, MOUSE_OUT and CLICK listeners for the menu item

　　menuItem.addEventListener(MouseEvent.MOUSE_OVER, mouseOverItem);

　　menuItem.addEventListener(MouseEvent.MOUSE_OUT, mouseOutItem);

　　menuItem.addEventListener(MouseEvent.CLICK, itemClicked);

　　//Add the menu item to the menu items array

　　menuItems.push(menuItem);

　　//Add the menu item to the stage

　　addChild(menuItem);

　　}

　　//Add an ENTER_FRAME listener for the animation

　　addEventListener(Event.ENTER_FRAME, moveCarousel);

　　//This function is called in each frame

　　function moveCarousel(e:Event):void {

　　//Calculate the angle speed according to mouseY position

　　angleSpeed = (mouseY - stage.stageHeight / 2) * 0.0002;

　　//Loop through the menu items

　　for (var i:uint = 0; i < NUMBER_OF_ITEMS; i++) {

　　//Store the menu item to a local variable

　　var menuItem:MenuItem = (MenuItem)(menuItems[i]);

　　//Update the current angle of the item

　　menuItem.currentAngle += angleSpeed;

　　//Calculate a scale ratio

　　var scaleRatio = focalLength/(focalLength + menuItem.zpos3D);

　　//Scale the item according to the scale ratio

　　menuItem.scaleX=menuItem.scaleY=scaleRatio;

　　//Set new 3D coordinates

　　menuItem.xpos3D=- radius*Math.cos(menuItem.currentAngle)*0.5;

　　menuItem.ypos3D=radius*Math.sin(menuItem.currentAngle);

　　menuItem.zpos3D=radius*Math.cos(menuItem.currentAngle);

　　//Update the item’s coordinates.

　　menuItem.x=vanishingPointX+menuItem.xpos3D*scaleRatio;

　　menuItem.y=vanishingPointY+menuItem.ypos3D*scaleRatio;

　　}

　　//Call the function that sorts the items so they overlap each other correctly

　　sortZ();

　　}

　　//This function sorts the items so they overlap each other correctly

　　function sortZ():void {

　　//Sort the array so that the item which has the highest

　　//z position (= furthest away) is first in the array

　　menuItems.sortOn(zpos3D, Array.NUMERIC | Array.DESCENDING);