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我如何掌握图像的中心点?
原标题:how do I get the center tag of the image?
  • 时间:2012-01-15 18:22:51
  •  标签:
  • javascript

我有:

document.elementFromPoint(12, 23);

什么是形象,我是如何看到X中心,如何协调形象? 相对而言?

问题回答
ImageXCenter = ImageXPos + Math.abs( ImageWidth / ImageXPos ) / 2;
ImageYCenter = ImageYPos + Math.abs( ImageHeight / ImageYPos ) / 2;

应:

Fiddle: http://jsfiddle.net/9ex2V/

function getCenter (e) {
    var left = e.offsetLeft,
        top = e.offsetTop,
        parent = e;

    while(parent = parent.offsetParent) {
        left += parent.offsetLeft;
        top += parent.offsetTop;  
    }


    return [
      left + Math.floor(e.offsetWidth / 2),
      top + Math.floor(e.offsetHeight / 2) 
    ];
}

我希望我没有忽略任何关于html/人/任何边界/婚生/婚礼的内容。





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