svg：子元素改变其父（svg容器）的大小

Question

看下图：

每当图表放大（d3js）时，svg容器就会变大。 为什么子元素（svg：g）的大小变化会影响其父容器（svg）的大小？ 我该如何防止这种情况发生？

var svgContainer = d3.select(".graph-container").append("svg")
  .attr("id", "firstGraph")
  .attr("width", w + margin[2] + margin[3]) // labels are placed in the margins
  .attr("height", h + margin[0] + margin[1])
  //.attr("viewBox", "0 0 "+(w+margin[2]+margin[3])+" "+containerHeight)
  //.attr("preserveAspectRation", "xMidYMid")
  .attr("transform", "translate(" + margin[2] + "," + margin[0] + ")")
  //.append("svg:g")
  //.attr("transform", "translate(" + margin[2] + "," + margin[0] + ")"); //origin at (marginLeft, marginTop)

var graph = svgContainer.append("svg:g")
  .attr("width", w)
  .attr("height", h)
  .call(zoom);

var rect = graph.append("svg:rect")
  .attr("width", w)
  .attr("height", h)
  .attr("class", "plot");

//draw price data line
graph.append("path")
  .attr("d", line1(priceData))
  .attr("class", "price");

//draw difficulty data line
graph.append("path")
  .attr("d", line2(difficultyData))
  .attr("class", "difficulty");

Answer 1

使用clipPath ：

svgContainer.append("defs").append("clipPath")
    .attr("id", "clip")
  .append("rect")
    .attr("width", w)
    .attr("height", h);

...

graph.append("path")
  .attr("d", line1(priceData))
  .attr("clip-path", "url(#clip)")
  .attr("class", "price");

关于clipPaths的MDN