javascript d3js 轴日期仅开始和结束值
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d3js axis dates start and end value only
提问by Bjarte
Resolved:
解决：
Thanks, the tickValues gave me the wanted result. I used the values from d3.min and d3.max:
谢谢，tickValues 给了我想要的结果。我使用了 d3.min 和 d3.max 中的值：
var xMin = d3.min(groups, function(c) { return d3.min(c.values, function(v) { return v.date; }); });
var xMax = d3.max(groups, function (c) { return d3.max(c.values, function (v) { return v.date; }); });
x.domain([xMin,xMax]);
var xAxis = d3.svg.axis()
.scale(x)
.tickFormat(d3.time.format('%y-%m-%d'))
.orient("bottom")
.tickValues([xMin, xMax]);
Problem:
问题：
So I have a D3js multi-series line chart.
所以我有一个 D3js 多系列折线图。
The X axis is bottom and is time (the range of this depends on the user selection, can be few days, weeks, months or years even). The Y axis is value and is decimal.
X 轴是底部，是时间（其范围取决于用户选择，可以是几天、几周、几个月甚至几年）。Y 轴是数值，是十进制的。
What I have problem with is that the labels on the axis is overlapping and it's looking rather poorly.
我的问题是轴上的标签重叠并且看起来很糟糕。
So my question is if there is a way to show only the first date on the axis and the last date?
所以我的问题是是否有办法只显示轴上的第一个日期和最后一个日期？
I have based the chart on this one: http://bl.ocks.org/3884955
我的图表基于这个：http: //bl.ocks.org/3884955
My code for x-axis:
我的 x 轴代码：
var x = d3.time.scale().range([0, dimensions.width]);
x.domain([
d3.min(groups, function (c) { return d3.min(c.values, function (v) { return v.date; }); }),
d3.max(groups, function (c) { return d3.max(c.values, function (v) { return v.date; }); })
]);
var xAxis = d3.svg.axis()
.scale(x)
.tickFormat(d3.time.format('%a %d'))
.orient("bottom")
.ticks(5);
svg.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + dimensions.height + ")")
.call(xAxis);
回答by Lars Kotthoff
Try adjusting the number of ticks with the ticks()functionor, if that doesn't produce the desired result, try setting the tick values explicitly with tickValues().
尝试使用该ticks()函数调整刻度数，或者，如果这不会产生所需的结果，请尝试使用 显式设置刻度值tickValues()。
