Question

大家好，请帮助我，以下是我的代码。所以实际上我将所有条形颜色都变成了黑色，我的要求是动态生成具有不同值，不同颜色梯度的条形颜色，不需要在条形之间放置空格，只需要根据我提供的数据绘制具有不同颜色的条形图即可**

var chartdata = [10, 21, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120,
  135, 150, 165, 180, 200, 220, 240, 270, 300, 330, 370, 410
];

var margin = {
  top: 30,
  right: 10,
  bottom: 30,
  left: 50
}

var height = 400 - margin.top - margin.bottom,
  width = 720 - margin.left - margin.right,
  barWidth = 40,
  barOffset = 20;

var dynamicColor;

var yScale = d3.scaleLinear()
  .domain([0, d3.max(chartdata)])
  .range([0, height])

var xScale = d3.scaleBand()
  .domain(d3.range(0, chartdata.length))
  .range([0, width])

var colors = d3.scaleLinear()
  .domain([0, chartdata.length * .33, chartdata.length * .66, chartdata.length])
  .range(['#d6e9c6', '#bce8f1', '#faebcc', '#ebccd1'])

var awesome = d3.select('#bar-chart').append('svg')
  .attr('width', width + margin.left + margin.right)
  .attr('height', height + margin.top + margin.bottom)
  .style('background', '#bce8f1')
  .append('g')
  .attr('transform', 'translate(' + margin.left + ', ' + margin.top + ')')
  .selectAll('rect').data(chartdata)
  .enter().append('rect')
  .attr('width', xScale.bandwidth())
  .attr('x', function(data, i) {
    return xScale(i);
  })
  .attr('height', 0)
  .attr('y', height)
  .on('mouseover', function(data) {
    dynamicColor = this.style.fill;
    d3.select(this)
      .style('fill', '#3c763d')
  })

.on('mouseout', function(data) {
  d3.select(this)
    .style('fill', dynamicColor)
})

awesome.transition()
  .attr('height', function(data) {
    return yScale(data);
  })
  .attr('y', function(data) {
    return height - yScale(data);
  })
  .delay(function(data, i) {
    return i * 20;
  })
  .duration(2000)
  .ease(d3.easeElastic)

var verticalGuideScale = d3.scaleLinear()
  .domain([0, d3.max(chartdata)])
  .range([height, 0])

var vAxis = d3.axisLeft(verticalGuideScale)
  .ticks(10)

var verticalGuide = d3.select('svg').append('g')
vAxis(verticalGuide)
verticalGuide.attr('transform', 'translate(' + margin.left + ', ' + margin.top + ')')
verticalGuide.selectAll('path')
  .styles({
    fill: 'none',
    stroke: "#3c763d"
  })
verticalGuide.selectAll('line')
  .styles({
    stroke: "#3c763d"
  })

var hAxis = d3.axisBottom(xScale)
  .ticks(chartdata.size)

var horizontalGuide = d3.select('svg').append('g')
hAxis(horizontalGuide)
horizontalGuide.attr('transform', 'translate(' + margin.left + ', ' + (height + margin.top) + ')')
horizontalGuide.selectAll('path')
  .styles({
    fill: 'none',
    stroke: "#3c763d"
  })
horizontalGuide.selectAll('line')
  .styles({
    stroke: "#3c763d"
  });

<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="https://d3js.org/d3-selection-multi.v1.min.js"></script>
<div class="someclass">
  <h2>barchart</h2>
  <div id="bar-chart">
  </div>
</div>

Answer 1

您好，尝试以下代码

var chartdata = [10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120,
  135, 150, 165, 180, 200, 220, 240, 270, 300, 330, 370, 410
];

var margin = {
  top: 30,
  right: 10,
  bottom: 30,
  left: 50
}

var height = 400 - margin.top - margin.bottom,
  width = 720 - margin.left - margin.right,
  barWidth = 40,
  barOffset = 20;

var dynamicColor;

var yScale = d3.scaleLinear()
  .domain([0, d3.max(chartdata)])
  .range([0, height])

var xScale = d3.scaleBand()
  .domain(d3.range(0, chartdata.length))
  .range([0, width])

var colors = d3.scaleLinear()
  .domain([0, chartdata.length * .33, chartdata.length * .66, chartdata.length])
  .range(['#d6e9c6', '#bce8f1', '#faebcc', '#ebccd1'])

var awesome = d3.select('#bar-chart').append('svg')
  .attr('width', width + margin.left + margin.right)
  .attr('height', height + margin.top + margin.bottom)
  .style('background', '#bce8f1')
  .append('g')
  .attr('transform', 'translate(' + margin.left + ', ' + margin.top + ')')
  .selectAll('rect').data(chartdata)
  .enter().append('rect')
  .styles({
    'fill': function(data, i) {
      return colors(i);
    },
    'stroke': '#31708f',
    'stroke-width': '1'
  })
  .attr('width', xScale.bandwidth())
  .attr('x', function(data, i) {
    return xScale(i);
  })
  .attr('height', 0)
  .attr('y', height)
  .on('mouseover', function(data) {
    dynamicColor = this.style.fill;
    d3.select(this)
      .style('fill', '#3c763d')
  })

.on('mouseout', function(data) {
  d3.select(this)
    .style('fill', dynamicColor)
})

awesome.transition()
  .attr('height', function(data) {
    return yScale(data);
  })
  .attr('y', function(data) {
    return height - yScale(data);
  })
  .delay(function(data, i) {
    return i * 20;
  })
  .duration(2000)
  .ease(d3.easeElastic)

var verticalGuideScale = d3.scaleLinear()
  .domain([0, d3.max(chartdata)])
  .range([height, 0])

var vAxis = d3.axisLeft(verticalGuideScale)
  .ticks(10)

var verticalGuide = d3.select('svg').append('g')
vAxis(verticalGuide)
verticalGuide.attr('transform', 'translate(' + margin.left + ', ' + margin.top + ')')
verticalGuide.selectAll('path')
  .styles({
    fill: 'none',
    stroke: "#3c763d"
  })
verticalGuide.selectAll('line')
  .styles({
    stroke: "#3c763d"
  })

var hAxis = d3.axisBottom(xScale)
  .ticks(chartdata.size)

var horizontalGuide = d3.select('svg').append('g')
hAxis(horizontalGuide)
horizontalGuide.attr('transform', 'translate(' + margin.left + ', ' + (height + margin.top) + ')')
horizontalGuide.selectAll('path')
  .styles({
    fill: 'none',
    stroke: "#3c763d"
  })
horizontalGuide.selectAll('line')
  .styles({
    stroke: "#3c763d"
  });

我刚刚添加

 .styles({
    'fill': function(data, i) {
      return colors(i);
    },
    'stroke': '#31708f',
    'stroke-width': '1'
  })

D3.js条形图根据权重或数据值生成条形颜色

1 个答案: