ActionScript3.0寫的flash菜單（十五）_鑫鑫原創(chuàng)-我的技術(shù),我的知識_百...

樂樂媽 2010-05-28

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ActionScript3.0寫的flash菜單（十五）

2009-01-22 18:58

老規(guī)矩，寫上效果圖：

點擊此處預(yù)覽效果

今天寫這個收獲不小：

一是影片剪輯內(nèi)部this的指向與ActionScript2.0意義一樣，所以很多ActionScript 2.0中經(jīng)常使用的as算法在ActionScript 3.0中亦可使用，很好很強大。

而是理解了一類動畫特效的實現(xiàn)原理。兩個影片剪輯，一個半遮罩，一個無遮罩，一個向上運動，一個向下，通過控制其運動就會實現(xiàn)圖片拼合顯示的特效了。

控制影片剪輯本身隨鼠標(biāo)距離放大縮小的代碼：

var max_scale = 130;
var min_scale = 50;
var max_alpha = 100;
var min_alpha = 50;

var speed = 5;

function getDistance():Number {
var distance = 0;
var con = 1.3;
distance = Math.abs(this.y-this.parent.mouseY);
return distance * con;
}

function setscale() {
var distance = getDistance();
var target_scale = max_scale-distance;
if (target_scale<min_scale) {
target_scale = min_scale;
}
var next_scale:Number = this.scaleX+((target_scale-this.scaleX)/speed);
return next_scale;
}

function setAlpha() {
var distance = getDistance();
var target_alpha = max_alpha-distance;

if (target_alpha<min_alpha) {
target_alpha = min_alpha;
}
var next_alpha:Number = this.alpha+((target_alpha-this.alpha)/speed);
return next_alpha;
}

function going(e:Event) {
var next_scale = setscale();
var next_alpha = setAlpha();
this.scaleX = next_scale/20;
this.scaleY = next_scale/20;
this.alpha = next_alpha/20;
}

this.addEventListener("enterFrame",going);

主時間軸代碼（按鈕事件）：

import fl.transitions.*;
import fl.transitions.easing.*;

a_btn.addEventListener("mouseDown",fruit_a);
b_btn.addEventListener("mouseDown",fruit_b);
c_btn.addEventListener("mouseDown",fruit_c);
d_btn.addEventListener("mouseDown",fruit_d);