Question

我有一段代码可以在mouseDown函数上创建圆圈。我正试图保存圆圈的x和y线，但无法找到解决方法。我需要从mouseDown保存多个线索实例。

是否可以在数组中执行此操作？

P.S我不是在寻找任何人发布代码或任何东西。请给我一些建议。或者建议将不胜感激：D我使用AS3而且我对它很新。

var posOne:Number;
//var posTwo:Number;
//var posThree:Number;
//var posFour:Number;
//var posFive:Number;



import flash.events.MouseEvent;





stage.addEventListener(MouseEvent.MOUSE_DOWN,startDoodle);
stage.addEventListener(MouseEvent.MOUSE_UP,stopDoodle);

    function startDoodle(e:MouseEvent):void{
    stage.addEventListener(MouseEvent.MOUSE_DOWN,makeTarget);
}




function stopDoodle(e:MouseEvent):void{

    stage.removeEventListener(MouseEvent.MOUSE_UP,makeTarget);

}





import flash.events.MouseEvent;


function makeTarget(e:MouseEvent):void {

var ellipse:Ellipse = new Ellipse (15,15, 0x00ff00);
addChild (ellipse);
ellipse.x = mouseX;
ellipse.y = mouseY;

//posOne == ellipse.x && ellipse.y


}

Answer 1

解决此问题的最简单方法是使用鼠标单击的Point和x坐标创建y个对象，然后将它们推送到数组。

function onMouseClick(event:MouseEvent):void
{
    var mousePoint:Point = new Point(stage.mouseX, stage.mouseY);
    mouseClicks.push(mousePoint);
}

如果您需要存储这些类型的坐标的负载，并且您担心性能或内存，则可以使用特定格式的字符串保存坐标字符串表示，其中包含某些分隔符，例如85|56$104|77$...，您将知道，每组x和y值都由一个符号分隔，并且该集合中的x和y值由其他分隔符分隔。存储此数据存储器的最佳方法是将输入限制为16位整数，然后将这两个值存储为32位整数（x值为前16位，y值为16位比特，例如）通过使用按位运算。

Answer 2

我认为在代码中看起来比解释更容易。并不是说你不应该阅读使用鼠标点，但是为了概述，下面的代码应该给你一个很好的开始使用点，给出你上面的内容。有关详细信息，请参阅评论。

// It helps to keep all the imports at hte top of your file, for easy code reading.

import flash.events.MouseEvent;
import flash.geom.Point;

// It helps to keep all class-level variables at the top of the file.

// Make an array rather than many individual variables.  That way you can use a for-loop to access the items.
// (The brackets "[]" are equivalent to new Array().)
var localPosArray:Array = [];
var globalPosArray:Array = [];
var ellipseArr:Array = [];

// can use these as temporary variables:
var localPoint:Point;
var globalPoint:Point;

// stores currently active ellipse index:
var curEllipseIdx:int;

// stores currently active point index:
var curPtIdx:int;

// store click count:
// (You could use an array instead, but probably not necessary.)
var countTotal:int = 0;

// Probably not needed:
// var posOne:Number;
//var posTwo:Number;
//var posThree:Number;
//var posFour:Number;
//var posFive:Number;

stage.addEventListener(MouseEvent.MOUSE_DOWN, startDoodle);
stage.addEventListener(MouseEvent.MOUSE_MOVE, sizeDoodle);
stage.addEventListener(MouseEvent.MOUSE_UP, stopDoodle);

function startDoodle(ev:MouseEvent):void
{
    // count clicks (mouse downs):
    countTotal++;

    // to find the coordinates on the local object -- this is usually different from the global coordinates.
    curPtIdx = localPosArray.length;
    localPosArray[curPtIdx] = new Point(ev.localX, ev.localY);

    // alternately, to overwrite a current point:
    //   curPtIdx = 0;
    //   localPosArray[curPtIdx] = new Point(ev.localX, ev.localY); // the old value will be garbage collected, if there are no other references.

    // to convert from local to global coordinates:
    //   curPtIdx = 0;
    //   globalPoint = localToGlobal(localPosArray[curPtIdx]);


    // alternately, to find the coordinates on the global object (the stage):
    curPtIdx = globalPosArray.length;
    globalPosArray[globalPosArray.length] = new Point(ev.stageX, ev.stageY);

    // alternately, to overwrite a current point:
    //   curPtIdx = 0;
    //   globalPosArray[curPtIdx] = new Point(ev.stageX, ev.stageY); // the old value will be garbage collected, if there are no other references.

    // to convert from local to global coordinates:
    //   curPtIdx = 0;
    //   localPoint = globalToLocal(globalPosArray[curPtIdx]);


    //You do not need to stop listening for mouse *down*, since that can never happen when the mouse is down. 
    // stage.addEventListener(MouseEvent.MOUSE_DOWN, makeTarget);
}

function stopDoodle(e:MouseEvent):void
{
    //You do not need to stop listening for mouse *up*, since that can never happen when the mouse is up. 
    //stage.removeEventListener(MouseEvent.MOUSE_UP, makeTarget);
}

function makeTarget(e:MouseEvent):void
{
    curPtIdx = 0;
    curEllipseIdx = ellipseArr.length;
    ellipseArr[curEllipseIdx] = new Ellipse(localPosArray[curPtIdx].x, localPosArray[curPtIdx].x, 0x00ff00);
    addChild(ellipseArr[curEllipseIdx]);

    // These lines are probably not necessary:
    //ellipse.x = mouseX;
    //ellipse.y = mouseY;

    // What is this for?
    //posOne == ellipse.x && ellipse.y
}

function sizeDoodle(ev:MouseEvent):void
{
    if (ellipseArr && ellipseArr[curEllipseIdx])
    {
        // size the ellipse by the distance from the initial point:
        // however you might do that.
    }
}

在鼠标单击时将x和y线保存为变量

2 个答案: