svg动态添加的line的起始坐标,终止坐标都对了,但是显示在界面上的跟实际上不同

yifon 发布于 2017/12/08 13:37
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用jquery动态获取A001节点的坐标,C001节点的坐标,坐标值看起来是对的,但是实际上svg的line线后,显示在页面上的位置不对?实际上我要的是A001连接C001的点,但线感觉上平移了。

获取到的起点终点坐标为:

startX:440
startY:175
endX:301.421875
endY:255
startLeft:440
startTop:225
endLeft:401.421875
endTop:305

动态添加的line为:

<line id="line0" xmlns="http://www.w3.org/2000/svg" stroke="#000" stroke-width="2" marker-end="url(#arrow)" stroke-dasharray="10,10" x1="440" y1="225" x2="401.421875" y2="305"></line>

以下为获取画line的方法:


function addLine(index, startId, endId) {
    //获取起始节点和终止节点的连线坐标
    var startX = $(startId).offset().left;
    var startY = $(startId).offset().top;
    var startLeft = 0;
    var startTop = 0;
    var endX = $(endId).offset().left;
    var endY = $(endId).offset().top;
    var endLeft = 0;
    var endTop = 0;
    //下述考虑起始点和终止点不在同一水平线上的坐标
    if (startY != endY) {
        //如果起始点在终止点左边,则起始点需要left+width,top+ 1/2 height;终止点left,top+ 1/2 height
        if (startX < endX) {
            startLeft = startX + $(startId).width();
            startTop = startY + $(startId).height() / 2;
            endLeft = endX;
            endTop = endY + $(endId).height() / 2;
        }
        //如果起始点在终止点右边,则起始点需要left,top+1/2 height;终止点left+width,top + 1/2 height
        if (startX > endX) {
            startLeft = startX;
            startTop = startY + $(startId).height() / 2;
            endLeft = endX+$(endId).width();
            endTop = endY + $(endId).height() / 2;
        }
        //如果起始点跟终止点在同一条垂直线上,则起始点left+1/2width,top+height;终止点left+1/2width,top
        if (startX == endX) {
            startLeft = startX + $(startId).width() / 2;
            startTop = startY + $(startId).height();
            endLeft = endX + $(endId).width() / 2;
            endTop = endY;
        }
    }
    //下述考虑起始点和终止点在同一水平线上的坐标
    else{
        //如果起始点在终止点左边,则起始点需要left+width;终止点left
        if (startX < endX) {
            startLeft = startX + $(startId).width();
            startTop = startY + $(startId).height() / 2;
            endLeft = endX;
            endTop = endY + $(endId).height() / 2;
        }
        //如果起始点在终止点右边,则起始点需要left;终止点left+width
        if (startX > endX) {
            startLeft = startX;
            startTop = startY + $(startId).height() / 2;
            endLeft = endX+$(endId).width();
            endTop = endY + $(endId).height() / 2;
        }
        //起始点和终止点重合了,不需要画线
        if (startX == endX) {
        }
    }

    var line = "<line" + " id=line" + index + " xmlns='http://www.w3.org/2000/svg' stroke='#000' stroke-width='2' marker-end='url(#arrow)' stroke-dasharray='10,10'></line>";
    console.log("startX:" + startX);
    console.log("startY:" +startY);
    console.log("endX:" + endX);
    console.log("endY:" + endY);
    console.log("startLeft:" + startLeft);
    console.log("startTop:" + startTop);
    console.log("endLeft:" + endLeft);
    console.log("endTop:" + endTop);
    var svg = d3.select('#wrap')
    $(line).appendTo($("#wrap"));

    $('#line' + index).attr({ x1: startLeft, y1: startTop, x2: endLeft, y2: endTop });
    svg.html(svg.html());//需要重写父元素,否则html添加了,但是页面不显示
    console.log(svg.html());

}
$("#test").on("click", function () {
    addLine(0, "#A001", "#C002");
})

知道应该怎么解决吗?

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yifon
yifon

svg默认应该是relative的,我把它的top设为0,left也设为0就可以了。

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