Question

我想通过坐标从SVG文件中获取对象ID。

例如在

中

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<svg
   xmlns:svg="http://www.w3.org/2000/svg" xmlns="http://www.w3.org/2000/svg" version="1.1"
   height="50" width="50">
   <rect id="rectRED"
	x="15" y="5" height="30" width="30"
        style="fill:#ff0000;fill-opacity:0.5;stroke:#000000;stroke-width:1.5" />
   <rect id="rectBLUE"
	x="5" y="15" height="30" width="30"
        style="fill:#0000ff;fill-opacity:0.5;stroke:#000000;stroke-width:1.5" />
</svg>

getObjectsAt(10,25)应返回包含rectBLUE
getObjectsAt(25,25)应返回包含rectRED和rectBLUE
getObjectsAt(10,10)应返回NIL

有没有办法实现这个目标？

Answer 1

有document.elementFromPoint方法，但它只返回最顶层的元素。要获得一个点下的所有元素，您可以找到最顶层的元素，隐藏它并再次查看该点，直到不再有元素：

var elementsAt = function( x, y ){
    var elements = [], current = document.elementFromPoint( x, y );
    // at least one element was found and it's inside a ViewportElement
    // otherwise it would traverse up to the <html> root of jsfiddle webiste.
    while( current &&  current.nearestViewportElement ){
        elements.push( current );
        // hide the element and look again
        current.style.display = "none";
        current = document.elementFromPoint( x, y );
    }
    // restore the display
    elements.forEach( function( elm ){
       elm.style.display = ''; 
    });
    return elements;
}

http://jsfiddle.net/duo02d38/

在给定坐标处获取SVG-Object_s？

1 个答案: