由网友(一拳打穿地球)分享简介：谁能告诉我怎样才能让撤消和重做功能？所以这是我目前的动作脚本。我无法弄清楚如何做到这一点，我看到在一些网站上的一些例子中，动作脚本是长下架。 PLS显示一个简单的方法，我可以使这项工作。抱歉语法错误... 进口的flash.display.MovieClip;进口flash.events.MouseEvent;VAR...

谁能告诉我怎样才能让撤消和重做功能？所以这是我目前的动作脚本。我无法弄清楚如何做到这一点，我看到在一些网站上的一些例子中，动作脚本是长下架。 PLS显示一个简单的方法，我可以使这项工作。

抱歉语法错误...

 进口的flash.display.MovieClip;
进口flash.events.MouseEvent;

VAR pen_mc：影片剪辑;
VAR图：布尔= FALSE;
变种penSize：UINT = 1;
VAR penColor：数= 0x000000处;

VAR形状：矢量＆lt;形状和GT =新矢量＆lt;形状和GT;（）;
VAR位置：= 0;
常量MAX_UNDO：INT = 10;


功能的init（）：无效{

pen_mc =新的MovieClip（）;
stage.addEventListener（的MouseEvent.MOUSE_DOWN，startDrawing）;
stage.addEventListener（的MouseEvent.MOUSE_MOVE，isDrawing）;
stage.addEventListener（侦听MouseEvent.MOUSE_UP，finishedDrawing）;
的addChild（pen_mc）;

}

在里面（）;

功能startDrawing（E：的MouseEvent）：无效{

跟踪（笔开始画）;

拉丝= TRUE;
pen_mc.graphics.lineStyle（penSize，penColor）;
pen_mc.graphics.moveTo（mouseX，mouseY的）;


}

功能isDrawing（E：的MouseEvent）：无效{
如果（图）{

    pen_mc.graphics.lineTo（mouseX，mouseY的）;
}

}


功能finishedDrawing（E：的MouseEvent）：无效{

     跟踪（完成绘制）;
     拉丝= FALSE;

     VAR SH：形状=新形状（）;
     sh.graphics.copyFrom（pen_mc.graphics）; //把当前状态到载体
     shapes.push（SH）;
     如果（shapes.length＆GT; MAX_UNDO）shapes.unshift（）; //下降最古老的国家
     位置= shapes.indexOf（SH）;
}
功能undo（）：无效{
    如果（位置大于0）{
        位置 - ;
        pen_mc.graphics.copyFrom（形状[位置] .graphics）;
    } //否则无法撤消
}
功能重做（）：无效{
    如果（位置+ 1＆LT; shapes.length）{
        位置++;
        pen_mc.graphics.copyFrom（形状[位置] .graphics）;
    } //否则不能重做
}


 功能btn_undo（E：MouseEvent）方法：无效
        {
            撤消（）;
        }

 功能btn_redo（E：MouseEvent）方法：无效
        {
            重做（）;
        }

undo_btn.addEventListener（MouseEvent.CLICK，btn_undo）;
redo_btn.addEventListener（MouseEvent.CLICK，btn_redo）;
 

解决方案

您可以使用的copyfrom（）在Shape.graphics存储当前的状态，同样以重做，为你的画布是一个形状。

  VAR形状：。矢量＆lt;形状和GT =新矢量＆lt;形状和GT;（）;
VAR位置：= 0;
常量MAX_UNDO：INT = 10;
...
功能finishedDrawing（E：的MouseEvent）：无效{

     跟踪（完成绘制）;
     拉丝= FALSE;

     VAR SH：形状=新形状（）;
     sh.graphics.copyFrom（penMC.graphics）; //把当前状态到载体
     shapes.push（SH）;
     如果（shapes.length＆GT; MAX_UNDO）shapes.unshift（）; //下降最古老的国家
     位置= shapes.indexOf（SH）;
}
功能undo（）：无效{
    如果（位置大于0）{
        位置 - ;
        penMC.graphics.copyFrom（形状[位置] .graphics）;
    } //否则无法撤消
}
功能重做（）：无效{
    如果（位置+ 1＆LT; shapes.length）{
        位置++;
        penMC.graphics.copyFrom（形状[位置] .graphics）;
    } //否则不能重做
}
 

这做法缺乏一些功能，如放弃撤销/重做堆栈的一部分，如果第一个百废待兴到某一点，然后绘制。你可以尝试添加这个功能吧。

Can anyone show me how can I make undo and redo function? so this is my current action script. I cant figure how to do it and i see some example in some web site, the action script is to long to under stand. Pls show a simple way that i can make this work..

sorry for bad grammar...

import flash.display.MovieClip;
import flash.events.MouseEvent;

var pen_mc:MovieClip;
var drawing:Boolean = false;
var penSize:uint = 1;
var penColor:Number = 0x000000;

var shapes:Vector.<Shape>=new Vector.<Shape>(); 
var position:int=0;
const MAX_UNDO:int=10;


function init():void{

pen_mc = new MovieClip();
stage.addEventListener(MouseEvent.MOUSE_DOWN, startDrawing);
stage.addEventListener(MouseEvent.MOUSE_MOVE, isDrawing);
stage.addEventListener(MouseEvent.MOUSE_UP, finishedDrawing);
addChild(pen_mc);

}

init();

function startDrawing(e:MouseEvent):void{

trace("Pen Has started drawing");

drawing = true;
pen_mc.graphics.lineStyle(penSize, penColor);
pen_mc.graphics.moveTo(mouseX, mouseY);


}

function isDrawing(e:MouseEvent):void{
if(drawing){

    pen_mc.graphics.lineTo(mouseX, mouseY);
}

}


function finishedDrawing(e:MouseEvent):void{

     trace("finished drawing");
     drawing = false;

     var sh:Shape=new Shape();
     sh.graphics.copyFrom(pen_mc.graphics); // put current state into the vector
     shapes.push(sh);
     if (shapes.length>MAX_UNDO) shapes.unshift(); // drop oldest state
     position=shapes.indexOf(sh);
}
function undo():void {
    if (position>0) {
        position--;
        pen_mc.graphics.copyFrom(shapes[position].graphics);
    } // else can't undo
}
function redo():void {
    if (position+1<shapes.length) {
        position++;
        pen_mc.graphics.copyFrom(shapes[position].graphics);
    } // else can't redo
}


 function btn_undo(e:MouseEvent):void
        {
            undo();
        }

 function btn_redo(e:MouseEvent):void
        {
            redo();
        }

undo_btn.addEventListener(MouseEvent.CLICK, btn_undo);
redo_btn.addEventListener(MouseEvent.CLICK, btn_redo);

解决方案

You can use copyFrom() in Shape.graphics to store current condition, and the same to "redo", as your canvas is a Shape.

var shapes:Vector.<Shape>=new Vector.<Shape>(); 
var position:int=0;
const MAX_UNDO:int=10;
...
function finishedDrawing(e:MouseEvent):void{

     trace("finished drawing");
     drawing = false;

     var sh:Shape=new Shape();
     sh.graphics.copyFrom(penMC.graphics); // put current state into the vector
     shapes.push(sh);
     if (shapes.length>MAX_UNDO) shapes.unshift(); // drop oldest state
     position=shapes.indexOf(sh);
}
function undo():void {
    if (position>0) {
        position--;
        penMC.graphics.copyFrom(shapes[position].graphics);
    } // else can't undo
}
function redo():void {
    if (position+1<shapes.length) {
        position++;
        penMC.graphics.copyFrom(shapes[position].graphics);
    } // else can't redo
}

This approach lacks some features, as to drop part of undo/redo stack if first undone to a certain point, then drawn. You can try adding this function yourself.