Actionscript 2 粒子

Posted 2023-02-16

【中文标题】Actionscript 2 粒子

【英文标题】：Actionscript 2 particles

【发布时间】：2018-05-11 22:07:45

【问题描述】：

我知道这是旧技术，但我只想更新我发送的闪存圣诞卡。基本上我使用粒子脚本（见下文）跟随我的鼠标并喷出一些金粒子。我想对此提出一些反对意见，以便它跟随在屏幕上的补间对象后面。我在想这可能是将事件侦听器更改为某些东西但无法弄清楚的情况。

编辑 - 我的对象是一个名为 sleigh 的影片剪辑

任何帮助表示赞赏。

脚本 (AS2)

//import bitmap class
import flash.display.BitmapData;

//Settings
var particleMaxSpeed:Number = 3;
var particleFadeSpeed:Number = 5;
var particleTotal:Number = 5;
var particleRange:Number = 25;

/**
 * createExplosion(target X position, target Y position)
 */
function createExplosion(targetX:Number, targetY:Number):Void

    //run for loop based on particleTotal
    for (var i:Number = 0; i<particleTotal; i++) 
        //attach bitmap from the library with the linked name "adobe_flash"
        var myBmp:BitmapData = BitmapData.loadBitmap("fire.jpg");

        //create the "main_holder" movieclip that will hold our bitmap
        var particle_mc = _root.createEmptyMovieClip("main_holder", _root.getNextHighestDepth());

        //create an "internal_holder" movieclip inside "main_holder" that we'll use to center the bitmap data
        var internal_holder:MovieClip = particle_mc.createEmptyMovieClip("internal_holder", particle_mc.getNextHighestDepth());

        //set "internal_holder" x and y position based on bitmap size
        internal_holder._x = -myBmp.width/2;
        internal_holder._y = -myBmp.height/2;   

        //finally, attach the bitmapData "myBmp" to the movieclip "internal_holder"
        internal_holder.attachBitmap(myBmp, internal_holder.getNextHighestDepth(), "never", true); 

        //set position & rotation, alpha
        particle_mc._x = targetX
        particle_mc._y = targetY
        particle_mc._rotation = random(360);
        particle_mc._alpha = random(50)+50;

        //set particle boundry            
        particle_mc.boundyLeft = targetX - particleRange;
        particle_mc.boundyTop = targetY - particleRange;
        particle_mc.boundyRight = targetX + particleRange;
        particle_mc.boundyBottom = targetY + particleRange;

        //set speed/direction of fragment
        particle_mc.speedX = Math.random(particleMaxSpeed)-Math.random(particleMaxSpeed);
        particle_mc.speedY = Math.random(particleMaxSpeed)-Math.random(particleMaxSpeed);
        particle_mc.speedX *= particleMaxSpeed
        particle_mc.speedY *= particleMaxSpeed

        //set fade out speed
        particle_mc.fadeSpeed = Math.random(particleFadeSpeed)*particleFadeSpeed;

        //just a visual particle counter
        numberOfParticles++;

        //make fragment move using onEnterFrame
        particle_mc.onEnterFrame = function():Void 
        
            //update alpha, x, y
            this._alpha -= this.fadeSpeed;
            this._x += this.speedX;
            this._y += this.speedY;
            //if fragment is invisible or out of bounds, remove it
            if (this._alpha <= 0 || this._x < this.boundyLeft || this._x > this.boundyRight || this._y < this.boundyTop || this._y > this.boundyBottom) 
            
                this.removeMovieClip();
                //
                numberOfParticles--;
            
        
    


/**
* Mouse Controls
*/
//create an object that we'll listen to
mouseListener = new Object();

//on Click, createExplosion
mouseListener.onMouseDown = function() 
    //createExplosion(_xmouse, _ymouse);

mouseListener.onMouseMove = function() 
    createExplosion(_xmouse, _ymouse);


//add listener
Mouse.addListener(mouseListener);

【参考方案1】：

您需要每帧调用createExplosion 函数并将sleigh x 和y 坐标而不是鼠标坐标传递给它。替换

mouseListener.onMouseMove = function() 
    createExplosion(_xmouse, _ymouse);

与

sleigh.onEnterFrame = function() 
    createExplosion(sleigh._x, sleigh._y);

并删除其他鼠标监听器