Question

如何在Flash中的Actionscript 3中创建一个跟随光标的MovieClip，但是它被限制为另一个MovieClip的不规则形状？

编辑：这有点我需要的东西：

stage.addEventListener(MouseEvent.MOUSE_MOVE,follow);
function follow(evt:MouseEvent){
      if(container.hitTestPoint(mouseX, mouseY, true)) {
    cursor.x = mouseX;
    cursor.y = mouseY;
      } else { 
      var dx:int = cursor.mouseX;
      var dy:int = ;
  cursor.x = dx;
  cursor.y = cursor.mouseY;

      }
}

我想要完成的是使光标MC在容器MC外部仍然“跟随”光标，但无法从中逃脱。

执行此操作的旧AS2脚本，但我不确定如何转换它：

onClipEvent (mouseMove) {
    tX = _parent._xmouse;
    // tX/tY are 'target' X/Y.
    tY = _parent._ymouse;
    if (_parent.constraintzone.hittest(tX, tY, true)) {
        _x = tX;
        _y = tY;
    } else {
        // and now the hurting begins
        // get XY of center of constraint zone
        cX = _parent.constraintzone._x;
        // cX/cY are 'constrained' X/Y,
        cY = _parent.constraintzone._y;
        // found somewhere inside the constraint zone.
        accuracy = 1;
        // smaller = more accurate.
        do {
            dX = (tX-cX)/2;
            // dX/dY are deltas to the midpoint between
            dY = (tY-cY)/2;
            // target XY and constrained XY.
            if (_parent.constraintzone.hittest((tX-dX), (tY-dY), true)) {
                cX += dX;
                // midpoint is in; step out towards mouse.
                cY += dY;
            } else {
                tX -= dX;
                // midpoint is out; step in towards center.
                tY -= dY;
            }
            // loop end.
            // (dD > .5) is more accurate, (dX > 10) is less.
        } while ((Math.abs(dX)>accuracy) || (Math.abs(dY)>accuracy));
        _x = tX;
        // we're done, set the final position.
        _y = tY;
    }
}

Answer 1

您粘贴的代码在AS 3中看起来像这样：

stage.addEventListener(MouseEvent.MOUSE_MOVE,follow);

function follow(evt:MouseEvent) {
 if (container.hitTestPoint(mouseX, mouseY, true)) {
  cursor.x = mouseX;
  cursor.y = mouseY;
 } else {
   var cX:Number = container.x + (container.width / 2);
        // cX/cY are 'constrained' X/Y,
        var cY:Number = container.y + (container.height / 2);
        // found somewhere inside the constraint zone.
  var tX:Number = mouseX;
  var tY:Number = mouseY;

  var accuracy:Number = 1;
        // smaller = more accurate.
        do {
            var dX:Number = (tX-cX)/2;
            // dX/dY are deltas to the midpoint between
            var dY:Number = (tY-cY)/2;
            // target XY and constrained XY.
            if (container.hitTestPoint((tX-dX), (tY-dY), true)) {
                cX += dX;
                // midpoint is in; step out towards mouse.
                cY += dY;
            } else {
                tX -= dX;
                // midpoint is out; step in towards center.
                tY -= dY;
            }
            // loop end.
            // (dD > .5) is more accurate, (dX > 10) is less.
        } while ((Math.abs(dX)>accuracy) || (Math.abs(dY)>accuracy));
        cursor.x = tX;
        // we're done, set the final position.
        cursor.y = tY;
 }
}

它有点酷，虽然它不完美，但工作速度相当快。所以，我会用你的实际形状检查它。这可能已经足够了。

Answer 2

如果使用hittest或rollover rollout事件，则可以使用mousex mousey查找鼠标位置。如果你需要最接近鼠标的指针那么你就处在一个试验和错误的奇妙世界。看到;

stackoverflow.com/questions/2389183/flash-closest-point-to-movieclip/2407510#2407510

FLASH / AS3：光标跟随不规则区域的图

2 个答案: