我在d3.js中繪製了兩條重疊的線條（有時第一個線條較高，有時第二個線條的y軸線的值較高）。我想填補下面這些方面的區域：在d3.js中填充兩個重疊區域
現在我只有這個：
var area = d3.area()
.curve(d3.curveBasis)
.x(function(d) { return margin.left + x(d.date); })
.y0(margin.top + height)
.y1(function(d) { return y(d.value); });
但是，這並不工作，當然。我知道堆積面積圖，但我認爲我需要一些技巧來完成這項工作。
你可以做到這一點重疊的兩個區域：
// a gray area which finish in the minimun data
var greyArea = d3.svg.area()
.interpolate("basis")
.x(function(d) { return x(d.date); })
.y(function(d) { return y(Math.min(d["First Line"], d["Second Line"])); });
// a colored area which in the value of the first line
var coloredArea = d3.svg.area()
.interpolate("basis")
.x(function(d) { return x(d.date); })
.y1(function(d) { return y(d["First Line"]); });
然後拉攏他們，
svg.append("clipPath")
.attr("id", "clip-above")
.append("path")
.attr("d", coloredArea.y0(height));
svg.append("clipPath")
.attr("id", "clip-below")
.append("path")
.attr("d", coloredArea.y0(0));
svg.append("path")
.attr("class", "area below")
.attr("clip-path", "url(#clip-below)")
.attr("d", coloredArea.y0(function(d) { return y(d["Second Line"]); }));
svg.append("path")
.attr("class", "area above")
.attr("clip-path", "url(#clip-above)")
.attr("d", coloredArea);
svg.append("path")
.attr("class", "area gray")
.attr("d", greyArea.y0(height));
工作演示JSFiddle Demo
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Line":"61.6"},{"date":"20111017","First Line":"62.8","Second Line":"61.1"},{"date":"20111018","First Line":"60.8","Second Line":"59.2"},{"date":"20111019","First Line":"62.1","Second Line":"58.9"},{"date":"20111020","First Line":"65.1","Second Line":"57.2"},{"date":"20111021","First Line":"55.6","Second Line":"56.4"},{"date":"20111022","First Line":"54.4","Second Line":"60.7"},{"date":"20111023","First Line":"54.4","Second Line":"65.1"},{"date":"20111024","First Line":"54.8","Second Line":"60.9"},{"date":"20111025","First Line":"57.9","Second Line":"56.1"},{"date":"20111026","First Line":"54.6","Second Line":"54.6"},{"date":"20111027","First Line":"54.4","Second Line":"56.1"},{"date":"20111028","First Line":"42.5","Second Line":"58.1"},{"date":"20111029","First Line":"40.9","Second Line":"57.5"},{"date":"20111030","First Line":"38.6","Second Line":"57.7"},{"date":"20111031","First Line":"44.2","Second Line":"55.1"},{"date":"20111101","First Line":"49.6","Second 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width = 960 - margin.left - margin.right,
height = 500 - margin.top - margin.bottom;
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]);
svg.datum(data);
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.append("path")
.attr("d", area.y0(height));
svg.append("clipPath")
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.attr("d", area.y0(0));
svg.append("path")
.attr("class", "area below")
.attr("clip-path", "url(#clip-below)")
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svg.append("path")
.attr("class", "area above")
.attr("clip-path", "url(#clip-above)")
.attr("d", area);
svg.append("path")
.attr("class", "line")
.attr("d", line.y0(height));
svg.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + height + ")")
.call(xAxis);
svg.append("g")
.attr("class", "y axis")
.call(yAxis)
.append("text")
.attr("transform", "rotate(-90)")
.attr("y", 6)
.attr("dy", ".71em")
.style("text-anchor", "end")
.text("Temperature (ºF)");body {
font: 10px sans-serif;
}
.axis path,
.axis line {
fill: none;
stroke: #000;
shape-rendering: crispEdges;
}
.x.axis path {
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}
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fill: rgb(252,141,89);
stroke: #000;
stroke-width: 1px;
}
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fill: rgb(145,207,96);
stroke: #000;
stroke-width: 1px;
}
.line {
fill: #ccc;
stroke: #000;
stroke-width: 0.5px;
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<div id="chart"></div>