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javascript - 旋转长 x 轴标签的可排序条形图

问题描述

我需要为长 X 轴标签调整 Mike Bostock 的可排序条形图（可在此处获得）。我将它们旋转为略微垂直，最初的结果是它们被很好地分开并且在 X 轴下方，但是当排序过程开始时，它们会回到轴上。如果有人能帮我把标签放在正确的地方，我会很高兴的！

我的 JSFiddle 在这里可用，JavaScript 代码如下：

var margin = {
    top: 20,
    right: 20,
    bottom: 60,
    left: 40
  },
  width = 960 - margin.left - margin.right,
  height = 600 - margin.top - margin.bottom;
var formatPercent = d3.format(".0%");
var x = d3.scale.ordinal()
  .rangeRoundBands([0, width], .1, 1);
var y = d3.scale.linear()
  .range([height, 0]);
var xAxis = d3.svg.axis()
  .scale(x)
  .orient("bottom");
var yAxis = d3.svg.axis()
  .scale(y)
  .orient("left")
  .tickFormat(formatPercent);
var svg = d3.select("body").append("svg")
  .attr("width", width + margin.left + margin.right)
  .attr("height", height + margin.top + margin.bottom)
  .append("g")
  .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
data = [{
    letter: "Alongname1",
    frequency: 0.08167
  },
  {
    letter: "Alongname2",
    frequency: 0.01492
  },
  {
    letter: "Alongname3",
    frequency: 0.0278
  },
  {
    letter: "Alongname4",
    frequency: 0.04253
  },
  {
    letter: "Alongname5",
    frequency: 0.12702
  },
  {
    letter: "Alongname6",
    frequency: 0.02288
  },
  {
    letter: "Alongname7",
    frequency: 0.02022
  },
  {
    letter: "Alongname8",
    frequency: 0.06094
  },
  {
    letter: "Alongname9",
    frequency: 0.06973
  },
  {
    letter: "Alongname10",
    frequency: 0.00153
  },
  {
    letter: "Alongname11",
    frequency: 0.00747
  },
  {
    letter: "Alongname12",
    frequency: 0.04025
  },
  {
    letter: "Alongname13",
    frequency: 0.02517
  },
  {
    letter: "Alongname14",
    frequency: 0.06749
  },
  {
    letter: "Alongname15",
    frequency: 0.07507
  },
  {
    letter: "Alongname16",
    frequency: 0.01929
  },
  {
    letter: "Alongname17",
    frequency: 0.00098
  },
  {
    letter: "Alongname18",
    frequency: 0.05987
  }
];
data.forEach(function(d) {
  d.frequency = +d.frequency;
});
x.domain(data.map(function(d) {
  return d.letter;
}));
y.domain([0, d3.max(data, function(d) {
  return d.frequency;
})]);
svg.append("g")
  .attr("class", "x axis")
  .attr("transform", "translate(0," + height + ")")
  .call(xAxis)
  .selectAll("text")
  .style("text-anchor", "end")
  .attr("dx", "-.8em")
  .attr("dy", ".35em")
  .attr("transform", "rotate(-65)");
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("Frequency");
svg.selectAll(".bar")
  .data(data)
  .enter().append("rect")
  .attr("class", "bar")
  .attr("x", function(d) {
    return x(d.letter);
  })
  .attr("width", x.rangeBand())
  .attr("y", function(d) {
    return y(d.frequency);
  })
  .attr("height", function(d) {
    return height - y(d.frequency);
  });
var sortTimeout = setTimeout(function() {
  d3.select("input").property("checked", true).each(change);
}, 2000);

function change() {
  clearTimeout(sortTimeout);
  // Copy-on-write since tweens are evaluated after a delay.
  var x0 = x.domain(data.sort(this.checked ?
        function(a, b) {
          return b.frequency - a.frequency;
        } :
        function(a, b) {
          return d3.ascending(a.letter, b.letter);
        })
      .map(function(d) {
        return d.letter;
      }))
    .copy();
  svg.selectAll(".bar")
    .sort(function(a, b) {
      return x0(a.letter) - x0(b.letter);
    });
  var transition = svg.transition().duration(750),
    delay = function(d, i) {
      return i * 50;
    };
  transition.selectAll(".bar")
    .delay(delay)
    .attr("x", function(d) {
      return x0(d.letter);
    });
  transition.select(".x.axis")
    .call(xAxis)
    .selectAll("g")
    .delay(delay);
}

标签： javascriptd3.jsbar-chart

解决方案

这种行为实际上是预期的：当您再次调用轴时，轴生成器会重置dxanddy属性。

您可以在第二次调用后再次应用它们，就像您在第一次调用中所做的那样，但您会注意到文本会在转到新位置之前快速闪烁。

因此，一个避免闪烁的简单替代方法是使用rotate自身设置标签的位置。例如（硬编码值）：

.attr("transform", "rotate(-65 12 32)");

这是进行更改的代码：

var margin = {
    top: 20,
    right: 20,
    bottom: 60,
    left: 40
  },
  width = 960 - margin.left - margin.right,
  height = 600 - margin.top - margin.bottom;
var formatPercent = d3.format(".0%");
var x = d3.scale.ordinal()
  .rangeRoundBands([0, width], .1, 1);
var y = d3.scale.linear()
  .range([height, 0]);
var xAxis = d3.svg.axis()
  .scale(x)
  .orient("bottom");
var yAxis = d3.svg.axis()
  .scale(y)
  .orient("left")
  .tickFormat(formatPercent);
var svg = d3.select("body").append("svg")
  .attr("width", width + margin.left + margin.right)
  .attr("height", height + margin.top + margin.bottom)
  .append("g")
  .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
data = [{
    letter: "Alongname1",
    frequency: 0.08167
  },
  {
    letter: "Alongname2",
    frequency: 0.01492
  },
  {
    letter: "Alongname3",
    frequency: 0.0278
  },
  {
    letter: "Alongname4",
    frequency: 0.04253
  },
  {
    letter: "Alongname5",
    frequency: 0.12702
  },
  {
    letter: "Alongname6",
    frequency: 0.02288
  },
  {
    letter: "Alongname7",
    frequency: 0.02022
  },
  {
    letter: "Alongname8",
    frequency: 0.06094
  },
  {
    letter: "Alongname9",
    frequency: 0.06973
  },
  {
    letter: "Alongname10",
    frequency: 0.00153
  },
  {
    letter: "Alongname11",
    frequency: 0.00747
  },
  {
    letter: "Alongname12",
    frequency: 0.04025
  },
  {
    letter: "Alongname13",
    frequency: 0.02517
  },
  {
    letter: "Alongname14",
    frequency: 0.06749
  },
  {
    letter: "Alongname15",
    frequency: 0.07507
  },
  {
    letter: "Alongname16",
    frequency: 0.01929
  },
  {
    letter: "Alongname17",
    frequency: 0.00098
  },
  {
    letter: "Alongname18",
    frequency: 0.05987
  }
];
data.forEach(function(d) {
  d.frequency = +d.frequency;
});
x.domain(data.map(function(d) {
  return d.letter;
}));
y.domain([0, d3.max(data, function(d) {
  return d.frequency;
})]);
svg.append("g")
  .attr("class", "x axis")
  .attr("transform", "translate(0," + height + ")")
  .call(xAxis)
  .selectAll("text")
  .attr("transform", "rotate(-65 12 32)");
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("Frequency");
svg.selectAll(".bar")
  .data(data)
  .enter().append("rect")
  .attr("class", "bar")
  .attr("x", function(d) {
    return x(d.letter);
  })
  .attr("width", x.rangeBand())
  .attr("y", function(d) {
    return y(d.frequency);
  })
  .attr("height", function(d) {
    return height - y(d.frequency);
  });
var sortTimeout = setTimeout(function() {
  d3.select("input").property("checked", true).each(change);
}, 2000);

function change() {
  clearTimeout(sortTimeout);
  // Copy-on-write since tweens are evaluated after a delay.
  var x0 = x.domain(data.sort(this.checked ?
        function(a, b) {
          return b.frequency - a.frequency;
        } :
        function(a, b) {
          return d3.ascending(a.letter, b.letter);
        })
      .map(function(d) {
        return d.letter;
      }))
    .copy();
  svg.selectAll(".bar")
    .sort(function(a, b) {
      return x0(a.letter) - x0(b.letter);
    });
  var transition = svg.transition().duration(750),
    delay = function(d, i) {
      return i * 50;
    };
  transition.selectAll(".bar")
    .delay(delay)
    .attr("x", function(d) {
      return x0(d.letter);
    });
  transition.select(".x.axis")
    .call(xAxis)
    .selectAll("g")
    .delay(delay);
}
body {
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  position: relative;
  width: 960px;
}

.axis text {
  font: 10px sans-serif;
}

.axis path,
.axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}

.bar {
  fill: steelblue;
  fill-opacity: .9;
}

.x.axis path {
  display: none;
}

label {
  position: absolute;
  top: 10px;
  right: 10px;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.4.11/d3.min.js"></script>
<label><input type="checkbox"> Sort values</label>

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