我有以下d3代码:
var json = [
{
date: "05/17",
numTags: 23
}
];
d3.select('summary-graph').selectAll('*').remove();
var svg = d3.select("summary-graph"),
margin = {
top: 20,
right: 30,
bottom: 30,
left: 40
},
width = svg.attr("width") - margin.left - margin.right,
height = svg.attr("height") - margin.top - margin.bottom;
var parseTime = d3.timeParse("%m/%y");
var svg = d3.select("summary-graph").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 + ")");
// Get the data
var data = json;
// format the data
data.forEach(function (d) {
console.log(d);
d.date = parseTime(d.date);
d.numTags = +d.numTags;
});
// set the ranges
var xScale = d3.scaleTime()
.range([0, width])
.domain(d3.extent(data, function (d) {
return d.date;
}))
.nice();
var yScale = d3.scaleLinear()
.range([height, 0])
.domain([0, d3.max(data, function (d) {
return Math.max(d.numTags);
})])
.nice();
// define the 1st line
var tagLine = d3.line()
.x(function (d) {
return xScale(d.date);
})
.y(function (d) {
return yScale(d.numTags);
});
// Axes
var xAxis = d3.axisBottom()
.scale(xScale)
.ticks(json.length)
.tickSizeOuter(0)
.tickFormat(d3.timeFormat('%B %Y'));
var yAxis = d3.axisLeft().scale(yScale);
svg.append("path")
.data([data])
.attr("class", "line")
.style("stroke", "blue")
.attr("d", tagLine);
var points = svg.selectAll(".point")
.data(data)
.enter().append("svg:circle")
.attr("stroke", "green")
.attr("fill", function(d, i) { return "blue" })
.attr("cx", function(d, i) { return xScale(d.date) })
.attr("cy", function(d, i) { return yScale(d.numTags) })
.attr("r", function(d, i) { return 10 });
// Add the X Axis
svg.append("g")
.attr("transform", "translate(0," + height + ")")
.call(xAxis)
.style("font-size","14px");;
// Add the Y Axis
svg.append("g")
.call(yAxis);
产生以下可视化:
我正在试图找出如何将刻度线居中并在只有1个这样的数据点时显示x轴标签。在2个数据点,我不喜欢它如何在x轴的最末端设置刻度线。对于3个数据点及以上,它看起来不错(感谢.nice(),似乎)。
任何帮助?
根据Gerado的回应,我能够接近。最后一个问题是X轴的左侧现在有月(3月),尽管当天没有数据。
修正: 将.ticks(json.length)更改为.ticks(d3.timeMonth.every(1))
答案 0 :(得分:3)
由于您只使用一个数据点,因此您的日期刻度具有一个域,其中较低和较高的值相同:
[
Mon May 01 2017 00: 00: 00 GMT + 1000,
Mon May 01 2017 00: 00: 00 GMT + 1000
]
要将该圆放在x轴的中间,您必须为比例域设置不同的值。
有几种方法可以做到这一点。我在此提出的解决方案涉及验证域的值是否相同......
if (xScale.domain()[0].getTime() == xScale.domain()[1].getTime()) {
......如果是的话,改变它们。在这种情况下,我会从下限减去一天,并在上限中加一天:
if (xScale.domain()[0].getTime() == xScale.domain()[1].getTime()) {
var dateLess = d3.timeDay.offset(xScale.domain()[0], -1);
var dateMore = d3.timeDay.offset(xScale.domain()[0], 1);
xScale.domain([dateLess, dateMore])
}
检查结果:
var json = [{
date: "05/17",
numTags: 23
}];
var margin = {
top: 20,
right: 30,
bottom: 30,
left: 40
},
width = 400,
height = 200;
var parseTime = d3.timeParse("%m/%y");
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 + ")");
// Get the data
var data = json;
// format the data
data.forEach(function(d) {
d.date = parseTime(d.date);
d.numTags = +d.numTags;
});
// set the ranges
var xScale = d3.scaleTime()
.range([0, width])
.domain(d3.extent(data, function(d) {
return d.date;
}))
.nice();
if (xScale.domain()[0].getTime() == xScale.domain()[1].getTime()) {
var dateLess = d3.timeDay.offset(xScale.domain()[0], -1);
var dateMore = d3.timeDay.offset(xScale.domain()[0], 1);
xScale.domain([dateLess, dateMore])
}
var yScale = d3.scaleLinear()
.range([height, 0])
.domain([0, d3.max(data, function(d) {
return Math.max(d.numTags);
})])
.nice();
// define the 1st line
var tagLine = d3.line()
.x(function(d) {
return xScale(d.date);
})
.y(function(d) {
return yScale(d.numTags);
});
// Axes
var xAxis = d3.axisBottom()
.scale(xScale)
.ticks(json.length)
.tickSizeOuter(0)
.tickFormat(d3.timeFormat('%B %Y'));
var yAxis = d3.axisLeft().scale(yScale);
svg.append("path")
.data([data])
.attr("class", "line")
.style("stroke", "blue")
.attr("d", tagLine);
var points = svg.selectAll(".point")
.data(data)
.enter().append("svg:circle")
.attr("stroke", "green")
.attr("fill", function(d, i) {
return "blue"
})
.attr("cx", function(d, i) {
return xScale(d.date)
})
.attr("cy", function(d, i) {
return yScale(d.numTags)
})
.attr("r", function(d, i) {
return 10
});
// Add the X Axis
svg.append("g")
.attr("transform", "translate(0," + height + ")")
.call(xAxis)
.style("font-size", "14px");;
// Add the Y Axis
svg.append("g")
.call(yAxis);

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编辑:正如您在编辑中提到的那样,当您有两个数据值时,我的解决方案将在限制上创建额外的滴答,这是预期的行为:
var json = [{
date: "05/17",
numTags: 23
}, {
date: "05/17",
numTags: 17
}];
var margin = {
top: 20,
right: 30,
bottom: 30,
left: 40
},
width = 400,
height = 200;
var parseTime = d3.timeParse("%m/%y");
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 + ")");
// Get the data
var data = json;
// format the data
data.forEach(function(d) {
d.date = parseTime(d.date);
d.numTags = +d.numTags;
});
// set the ranges
var xScale = d3.scaleTime()
.range([0, width])
.domain(d3.extent(data, function(d) {
return d.date;
}))
.nice();
if (xScale.domain()[0].getTime() == xScale.domain()[1].getTime()) {
var dateLess = d3.timeDay.offset(xScale.domain()[0], -1);
var dateMore = d3.timeDay.offset(xScale.domain()[0], 1);
xScale.domain([dateLess, dateMore])
}
var yScale = d3.scaleLinear()
.range([height, 0])
.domain([0, d3.max(data, function(d) {
return Math.max(d.numTags);
})])
.nice();
// define the 1st line
var tagLine = d3.line()
.x(function(d) {
return xScale(d.date);
})
.y(function(d) {
return yScale(d.numTags);
});
// Axes
var xAxis = d3.axisBottom()
.scale(xScale)
.ticks(json.length)
.tickSizeOuter(0)
.tickFormat(d3.timeFormat('%B %Y'));
var yAxis = d3.axisLeft().scale(yScale);
svg.append("path")
.data([data])
.attr("class", "line")
.style("stroke", "blue")
.attr("d", tagLine);
var points = svg.selectAll(".point")
.data(data)
.enter().append("svg:circle")
.attr("stroke", "green")
.attr("fill", function(d, i) {
return "blue"
})
.attr("cx", function(d, i) {
return xScale(d.date)
})
.attr("cy", function(d, i) {
return yScale(d.numTags)
})
.attr("r", function(d, i) {
return 10
});
// Add the X Axis
svg.append("g")
.attr("transform", "translate(0," + height + ")")
.call(xAxis)
.style("font-size", "14px");;
// Add the Y Axis
svg.append("g")
.call(yAxis);
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<script src="https://d3js.org/d3.v4.js"></script>
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有几种方法可以删除这些标记。其中一个是使用tickValues
:
.tickValues(data.map(function(d){ return d.date}))
以下是演示:
var json = [{
date: "05/17",
numTags: 23
}, {
date: "05/17",
numTags: 17
}];
var margin = {
top: 20,
right: 30,
bottom: 30,
left: 40
},
width = 400,
height = 200;
var parseTime = d3.timeParse("%m/%y");
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 + ")");
// Get the data
var data = json;
// format the data
data.forEach(function(d) {
d.date = parseTime(d.date);
d.numTags = +d.numTags;
});
// set the ranges
var xScale = d3.scaleTime()
.range([0, width])
.domain(d3.extent(data, function(d) {
return d.date;
}))
.nice();
if (xScale.domain()[0].getTime() == xScale.domain()[1].getTime()) {
var dateLess = d3.timeDay.offset(xScale.domain()[0], -1);
var dateMore = d3.timeDay.offset(xScale.domain()[0], 1);
xScale.domain([dateLess, dateMore])
}
var yScale = d3.scaleLinear()
.range([height, 0])
.domain([0, d3.max(data, function(d) {
return Math.max(d.numTags);
})])
.nice();
// define the 1st line
var tagLine = d3.line()
.x(function(d) {
return xScale(d.date);
})
.y(function(d) {
return yScale(d.numTags);
});
// Axes
var xAxis = d3.axisBottom()
.scale(xScale)
.ticks(json.length)
.tickSizeOuter(0)
.tickValues(data.map(function(d){ return d.date}))
.tickFormat(d3.timeFormat('%B %Y'));
var yAxis = d3.axisLeft().scale(yScale);
svg.append("path")
.data([data])
.attr("class", "line")
.style("stroke", "blue")
.attr("d", tagLine);
var points = svg.selectAll(".point")
.data(data)
.enter().append("svg:circle")
.attr("stroke", "green")
.attr("fill", function(d, i) {
return "blue"
})
.attr("cx", function(d, i) {
return xScale(d.date)
})
.attr("cy", function(d, i) {
return yScale(d.numTags)
})
.attr("r", function(d, i) {
return 10
});
// Add the X Axis
svg.append("g")
.attr("transform", "translate(0," + height + ")")
.call(xAxis)
.style("font-size", "14px");;
// Add the Y Axis
svg.append("g")
.call(yAxis);
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<script src="https://d3js.org/d3.v4.js"></script>
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