如何在D3折线图中添加轴和线之间的空间? [英] How to add space between axis and line in D3 line chart?
问题描述
我创建了这个简单的图表:
var data = [[2013-01-24 06:38:02.235191 ,52],[2013-01-23 06:38:02.235310,54],[2013-01-22 06:38:02.235330,45],[2013-01-21 06:38:
margin = {top:20,right:20,bottom:20},
maxValue = d3.max(data,function(d){return d [1];} 50,left:50},
width = 500 - margin.left - margin.right,
height = 300 - margin.top - margin.bottom,
svg,x,y,xAxis ,yAxis,line;
$ .each(data,function(index,val){
val [0] = new Date(val [0]);
}
x = d3.time.scale()
.range([0,width])
y = d3.scale.linear()
。 domain([0,maxValue])
.range([height,0]);
xAxis = d3.svg.axis()
.scale(x)
.tickSize(4,2,0)
.ticks days,1)
.tickFormat(d3.time.format(%m /%d))
.orient(bottom);
yAxis = d3.svg.axis()
.scale(y)
// .ticks(5)
// .tickValues([0,maxValue * 0.25,maxValue * 0.5,maxValue * 0.75,maxValue])
.tickSize(4,2,0)
。
line = d3.svg.line()
.x(function(d){return x(d [0]);})
.y ){return y(d [1]);});
svg = d3.select(#chart-holder)。append(svg)
.attr(width,width + margin.left + margin.right)
.attr(height,height + margin.top + margin.bottom)
.append(g)
.attr(transform,translate +,+ margin.top +));
x.domain(d3.extent(data,function(d){return d [0];}));
y.domain(d3.extent(data,function(d){return d [1];}));
svg.append(g)
.attr(class,x axis)
.attr(transform height)
.call(xAxis)
.selectAll(text)
.attr(transform,function(d){
returnrotate -60)translate(+ -this.getBBox()。height * 1.7 +,+
-this.getBBox()。width / 4 +);
}
svg.append(g)
.attr(class,y axis)
.call(yAxis);
svg.append(path)
.datum(data)
.attr(class,line)
.attr ,line);
svg
.selectAll(circle)
.data(data)
.enter()。append(circle)
.attr (fill,#0b8da0)
.attr(r,3.5)
.attr(cx,function(d){return x(d [0]);})
.attr(cy,function(d){return y(d [1]);});
如何在轴和线之间添加一个空格, / p>
还有一种方法可以强制yAxis的ticks总是从0开始,无论数据集中的最小值是什么?
工作示例可以在这里找到: http://jsfiddle.net/n7Vmr/
您可以更改用于绘制y轴的标度的域,查找线
y.domain(d3.extent(data,function(d){return d [1];}));
需要更改,如果您希望它小于数据集中的最小值use
y.domain([d3.min(data,function(d){return d [1];}) - 1,maxValue ]);
或如果您希望它从0开始,不管数据如何
y.domain([0,maxValue]);
Given this simple chart I created:
var data = [["2013-01-24 06:38:02.235191", 52], ["2013-01-23 06:38:02.235310", 54], ["2013-01-22 06:38:02.235330", 45], ["2013-01-21 06:38:02.235346", 53]],
maxValue = d3.max(data, function (d) { return d[1]; }),
margin = {top: 20, right: 20, bottom: 50, left: 50},
width = 500 - margin.left - margin.right,
height = 300 - margin.top - margin.bottom,
svg, x, y, xAxis, yAxis, line;
$.each(data, function(index, val) {
val[0] = new Date(val[0]);
});
x = d3.time.scale()
.range([0, width])
y = d3.scale.linear()
.domain([0, maxValue])
.range([height, 0]);
xAxis = d3.svg.axis()
.scale(x)
.tickSize(4, 2, 0)
.ticks(d3.time.days, 1)
.tickFormat(d3.time.format("%m/%d"))
.orient("bottom");
yAxis = d3.svg.axis()
.scale(y)
// .ticks(5)
// .tickValues([0, maxValue * 0.25, maxValue * 0.5, maxValue * 0.75, maxValue])
.tickSize(4, 2, 0)
.orient("left");
line = d3.svg.line()
.x(function(d) { return x(d[0]); })
.y(function(d) { return y(d[1]); });
svg = d3.select("#chart-holder").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 + ")");
x.domain(d3.extent(data, function(d) { return d[0]; }));
y.domain(d3.extent(data, function(d) { return d[1]; }));
svg.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + height + ")")
.call(xAxis)
.selectAll("text")
.attr("transform", function(d) {
return "rotate(-60)translate(" + -this.getBBox().height * 1.7 + "," +
-this.getBBox().width/4 + ")";
});
svg.append("g")
.attr("class", "y axis")
.call(yAxis);
svg.append("path")
.datum(data)
.attr("class", "line")
.attr("d", line);
svg
.selectAll("circle")
.data(data)
.enter().append("circle")
.attr("fill", "#0b8da0")
.attr("r", 3.5)
.attr("cx", function(d) { return x(d[0]); })
.attr("cy", function(d) { return y(d[1]); });
How can I add a space between axis and line, so it won't touch the axis.
Also is there a way to force yAxis ticks to always start from 0, no matter what is the smallest value in the data set?
Working example can be found here: http://jsfiddle.net/n7Vmr/
You can just change the domain of the scale used to draw the y-axis, look for the line
y.domain(d3.extent(data, function(d) { return d[1]; }));
needs to be changed, if you want it one less than the smallest value in your dataset use
y.domain([d3.min(data, function (d) { return d[1]; })-1, maxValue]);
or if you want it to start from 0, regardless of the data
y.domain([0, maxValue]);
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