javascript – d3 v4实现中d3-brush的JS错误
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此示例适用于d3 v3版本.它是this sample的修剪版本,在与按钮交互时,画笔在其新位置动画.
我实际上是尝试使用d3 v4版本来做this.
修剪是为了识别关注的区域.修剪过的代码是
var margin = { top: 10, right: 10, bottom: 100, left: 40 },
margin2 = { top: 430, right: 10, bottom: 20, left: 40 },
width = 960 - margin.left - margin.right,
height = 500 - margin.top - margin.bottom,
height2 = 500 - margin2.top - margin2.bottom;
var parseDate = d3.timeParse("%b %Y");
var x = d3.scaleTime().range([0, width]),
x2 = d3.scaleTime().range([0, width]),
y = d3.scaleLinear().range([height, 0]),
y2 = d3.scaleLinear().range([height2, 0]);
var xAxis = d3.axisBottom(x),
xAxis2 = d3.axisBottom(x2),
yAxis = d3.axisLeft(y);
var brush = d3.brushX(x2)
.on("brush end", brushed);
var area1 = d3.area()
.curve(d3.curveMonotoneX)
.x(function(d) { return x(d.date); })
.y0(height)
.y1(function(d) { return y(d.price); });
var area2 = d3.area()
.curve(d3.curveMonotoneX)
.x(function(d) { return x2(d.date); })
.y0(height2)
.y1(function(d) { return y2(d.price); });
// make some buttons to drive our zoom
d3.select("body").append("div")
.attr("id","btnDiv")
.style('font-size','75%')
.style("width","250px")
.style("position","absolute")
.style("left","5%")
.style("top","200px")
var btns = d3.select("#btnDiv").selectAll("button").data([2001, 2002, 2003, 2004])
btns = btns.enter().append("button").style("display","inline-block")
// fill the buttons with the year from the data assigned to them
btns.each(function (d) {
this.innerText = d;
})
btns.on("click", drawBrush);
function drawBrush() {
// define our brush extent to be begin and end of the year
brush.extent([new Date(this.innerText + '-01-01'), new Date(this.innerText + '-12-31')])
// now draw the brush to match our extent
// use transition to slow it down so we can see what is happening
// remove transition so just d3.select(".brush") to just draw
brush(d3.select(".brush").transition());
// now fire the brushstart, brushmove, and brushend events
// remove transition so just d3.select(".brush") to just draw
brush.event(d3.select(".brush").transition().delay(1000))
}
var svg = d3.select("body").append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom);
svg.append("defs").append("clipPath")
.attr("id", "clip")
.append("rect")
.attr("width", width)
.attr("height", height);
var focus = svg.append("g")
.attr("class", "focus")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
var context = svg.append("g")
.attr("class", "context")
.attr("transform", "translate(" + margin2.left + "," + margin2.top + ")");
d3.csv("sp500.csv", type, function(error, data) {
if (error) throw error;
x.domain(d3.extent(data, function(d) { return d.date; }));
y.domain([0, d3.max(data, function(d) { return d.price; })]);
x2.domain(x.domain());
y2.domain(y.domain());
context.append("g")
.attr("class", "x brush")
.call(brush)
.selectAll("rect")
.attr("y", -6)
.attr("height", height2 + 7);
});
function brushed() {
x.domain(brush.empty() ? x2.domain() : brush.extent());
}
function type(d) {
d.date = parseDate(d.date);
d.price = +d.price;
return d;
}svg {
font: 10px sans-serif;
}
.area {
fill: steelblue;
clip-path: url(#clip);
}
.axis path,
.axis line {
fill: none;
stroke: #000;
shape-rendering: crispEdges;
}
.brush .extent {
stroke: #fff;
fill-opacity: .125;
shape-rendering: crispEdges;
}<!DOCTYPE html>
<meta charset="utf-8">
<style>
svg {
font: 10px sans-serif;
}
.area {
fill: steelblue;
clip-path: url(#clip);
}
.axis path,
.axis line {
fill: none;
stroke: #000;
shape-rendering: crispEdges;
}
.brush .extent {
stroke: #fff;
fill-opacity: .125;
shape-rendering: crispEdges;
}
</style>
<body>
<script src="http://d3js.org/d3.v4.js"></script>
</body>请参阅fiddle以获取正确的错误.附加在代码段中时,错误会有所不同
任何帮助都非常值得赞赏.
更新：
错误是
d3.v4.js:12632 Uncaught TypeError: group.property is not a function
有没有人有一个预感是什么新的API来解决点击这个fiddle中的按钮的错误如果一个人可以更新它的小提琴将是很棒的.或者至少让我知道修改后的API,因为样本适用于v3.
解决方法:
我在上述示例后遇到了同样的错误并找到了您的问题.由于您的小提琴不能正常工作(无法访问CSV),我无法确认我的答案是否适合您.但它在我本地工作.
它在v4上变得异常简单.只需调用brush.move(group, selection)以编程方式移动画笔选择.但是,参数选择似乎是基于画笔范围的相对坐标,因此如果您的轴是日期/时间,则可能必须将日期转换为坐标编号.
例如,我在定义画笔时传递了一个参数.
let width = 200;
let height = 80;
let x = d3.scaleTime().range([0, width]);
let brush = d3.brushX()
.extent([[0, 0], [width, height]])
.on("brush end", brushed);
context.append("g")
.attr("class", "brush")
.call(brush)
.call(brush.move, x.range());
然后我修改了drawBrush()函数,只使用了brush.move()：
function drawBrush() {
// Convert your dates to pixels along the brush's width.
let start = x(new Date(this.innerText + '-01-01'));
let end = x(new Date(this.innerText + '-12-31'));
// Alternatively, let's say the coordinates of your year is from 20% to 40% of your graph.
// let start = 0.2 * width;
// let end = 0.4 * width;
brush.move(context.select("g.brush").transition().delay(1000).duration(500), [start, end]);
}
不幸的是,这个解决方案将打破drawBrush()函数的两步转换,并将其合并为一个动画.您必须自己进行其他修改.
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