在createjs textAlign Center导致命中区域未对齐

当我将文本设置为链接,设置边界形状,并将命中区域设置为边界形状时,如果textAlign='center',我的命中区域将关闭。有什么想法吗?

var linkColor = "#0000ff";
var linkFont = "bold 14px Times";

var presentationLink = new createjs.Text("View Presentation", linkFont, linkColor);
presentationLink.textAlign = "left";
presentationLink.maxWidth = 170;
presentationLink.x = 300;
presentationLink.y = 125;
stage.addChild(presentationLink);

var plBounds=presentationLink.getTransformedBounds();

var s = new createjs.Shape().set({ x: plBounds.x, y: plBounds.y + plBounds.height });
s.graphics.s(linkColor).moveTo(0, 0).lineTo(plBounds.width, 0);
stage.addChild(s);

var hitAreaForPLink = new createjs.Shape(new createjs.Graphics().beginFill("#ffffff").drawRect(-10, -10, plBounds.width + 20, plBounds.height + 10));
presentationLink.hitArea = hitAreaForPLink;

stage.enableMouseOver();

presentationLink.on("mouseover", function () {
    presentationLink.cursor = "pointer";
});