我目前正在尝试学习 d3，想做一个小项目，但遇到了问题。我一直使用这个 block 作为基础:Brush & Zoom
并用我拥有的散点图数据替换区域填充。我能够获得要渲染的点，但是当在第二个轴上移动缩放/画笔时，.focus 图表的 x 轴会发生变化，但我的散点图却没有。我尝试了多种方法，包括查看是否将其附加到正确的 svg 元素，但以我对 D3 的有限理解，我不太确定出了什么问题。我的示例代码如下:
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.4.11/d3.min.js"></script>
<!DOCTYPE html>
<meta charset="utf-8">
<style>
.area {
fill: #FDB827;
clip-path: url(#clip);
}
.zoom {
cursor: move;
fill: none;
pointer-events: all;
}
</style>
<svg width="960" height="500"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>
var svg = d3.select("svg"),
margin = {top: 20, right: 20, bottom: 110, left: 40},
margin2 = {top: 430, right: 20, bottom: 30, left: 40},
width = +svg.attr("width") - margin.left - margin.right,
height = +svg.attr("height") - margin.top - margin.bottom,
height2 = +svg.attr("height") - 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()
.extent([[0, 0], [width, height2]])
.on("brush end", brushed);
var zoom = d3.zoom()
.scaleExtent([1, Infinity])
.translateExtent([[0, 0], [width, height]])
.extent([[0, 0], [width, height]])
.on("zoom", zoomed);
var area = d3.area()
.curve(d3.curveMonotoneX)
.x(function(d) { return x(d.date); })
.y0(height)
.y1(function(d) { return y(d.PTS); });
var area2 = d3.area()
.curve(d3.curveMonotoneX)
.x(function(d) { return x2(d.date); })
.y0(height2)
.y1(function(d) { return y2(d.PTS); });
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("./data/kobe-playoff1.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.PTS; })]);
x2.domain(x.domain());
y2.domain(y.domain());
let fixedData ={};
let arr = [];
data.forEach((d)=>{
fixedData["date"] = d.date;
fixedData["PTS"] = d.PTS;
arr.push(fixedData);
fixedData = {};
})
//
focus.append("path")
.datum(arr)
.attr("class", "area")
.attr("d", area);
// draw dots
focus.selectAll("circle")
.data(data)
.enter().append("circle")
.attr("class", "brush")
// .attr("class", "brush")
.attr("r", (d)=>{return (d.PTS)})
.attr("cx", (d)=>{return x(d.date)})
.attr("cy", (d)=>{return y(d.PTS)})
.style("fill", "#552583");
// .on("mouseover", function(d) {
// tooltip.transition()
// .duration(200)
// .style("opacity", .9);
// tooltip.html(d["date"] + "<br/> (" + xValue(d)
// + ", " + yValue(d) + ")")
// .style("left", (d3.event.pageX + 5) + "px")
// .style("top", (d3.event.pageY - 28) + "px");
// })
// .on("mouseout", function(d) {
// tooltip.transition()
// .duration(500)
// .style("opacity", 0);
// });
focus.append("g")
.attr("class", "axis axis--x")
.attr("transform", "translate(0," + height + ")")
.call(xAxis);
focus.append("g")
.attr("class", "axis axis--y")
.call(yAxis);
context.append("path")
.datum(data)
.attr("class", "area")
.attr("d", area2);
context.append("g")
.attr("class", "axis axis--x")
.attr("transform", "translate(0," + height2 + ")")
.call(xAxis2);
context.append("g")
.attr("class", "brush")
.call(brush)
.call(brush.move, x.range());
focus.append("g")
.attr("class", "zoom")
.attr("width", width)
.attr("height", height)
.attr("transform", "translate(" + margin.left + "," + margin.top + ")")
.call(zoom);
});
function brushed() {
if (d3.event.sourceEvent && d3.event.sourceEvent.type === "zoom") return; // ignore brush-by-zoom
var s = d3.event.selection || x2.range();
x.domain(s.map(x2.invert, x2));
focus.select(".area").attr("d", area);
focus.select(".axis--x").call(xAxis);
svg.select(".zoom").call(zoom.transform, d3.zoomIdentity
.scale(width / (s[1] - s[0]))
.translate(-s[0], 0));
}
function zoomed() {
if (d3.event.sourceEvent && d3.event.sourceEvent.type === "brush") return; // ignore zoom-by-brush
var t = d3.event.transform;
x.domain(t.rescaleX(x2).domain());
focus.select(".area").attr("d", area);
focus.select(".axis--x").call(xAxis);
context.select(".brush").call(brush.move, x.range().map(t.invertX, t));
}
function type(d) {
// d.date = parseDate(d.date);
// d.price = +d.price;
// d.date = new Date(d.Date);
d.date = Date.parse(d.Date);
d.PTS = +d.PTS;
return d;
}
</script>我使用的示例数据如下:
Rk,G,Date,Age,Tm,,Opp,,GS,MP,FG,FGA,FG%,3P,3PA,3P%,FT,FTA,FT%,ORB,DRB,TRB,AST,STL,BLK,TOV,PF,PTS,GmSc
1,1,1997-04-25,18-245,LAL,,POR,W (+18),0,1:00,1,1,1.000,0,0,,0,0,,0,0,0,0,0,0,0,0,2,1.7
2,2,1997-04-27,18-247,LAL,,POR,W (+14),0,5:00,1,3,.333,0,1,.000,4,4,1.000,0,0,0,0,0,0,0,1,6,3.9
3,3,1997-04-30,18-250,LAL,@,POR,L (-8),0,27:00,7,13,.538,2,3,.667,6,8,.750,0,4,4,2,1,0,4,5,22,12.5
4,4,1997-05-02,18-252,LAL,@,POR,W (+4),0,6:00,0,0,,0,0,,0,0,,0,0,0,0,0,0,0,0,0,0.0
5,5,1997-05-04,18-254,LAL,@,UTA,L (-16),0,14:00,1,7,.143,1,5,.200,0,1,.000,1,1,2,3,0,1,0,5,3,-0.1
6,6,1997-05-06,18-256,LAL,@,UTA,L (-2),0,4:00,1,1,1.000,0,0,,0,0,,0,0,0,1,0,0,1,2,2,0.6
7,7,1997-05-08,18-258,LAL,,UTA,W (+20),0,19:00,3,7,.429,0,2,.000,13,14,.929,0,1,1,3,1,1,3,3,19,14.8
8,8,1997-05-10,18-260,LAL,,UTA,L (-15),0,28:00,3,9,.333,3,6,.500,0,0,,0,2,2,0,0,0,5,4,9,-2.1
9,9,1997-05-12,18-262,LAL,@,UTA,L (-5),0,29:00,4,14,.286,0,6,.000,3,3,1.000,0,2,2,2,1,0,1,3,11,3.6 
任何帮助将不胜感激!谢谢。
最佳答案
在画笔和缩放功能中，您需要选择圆圈并应用动态属性。但在此之前，您需要为您的圈子重命名该类。像这样的东西:
// draw dots
focus.selectAll("circle")
.data(data)
.enter().append("circle")
.attr("class", "circle")
...
function brushed() {
if (d3.event.sourceEvent && d3.event.sourceEvent.type === "zoom") return; // ignore brush-by-zoom
var s = d3.event.selection || x2.range();
x.domain(s.map(x2.invert, x2));
focus.select(".area").attr("d", area);
focus.select(".axis--x").call(xAxis);
focus.selectAll(".circle")
.attr("r", (d)=>{return (d.PTS)})
.attr("cx", (d)=>{return x(d.date)})
.attr("cy", (d)=>{return y(d.PTS)})
svg.select(".zoom").call(zoom.transform, d3.zoomIdentity
.scale(width / (s[1] - s[0]))
.translate(-s[0], 0));
}
function zoomed() {
if (d3.event.sourceEvent && d3.event.sourceEvent.type === "brush") return; // ignore zoom-by-brush
var t = d3.event.transform;
x.domain(t.rescaleX(x2).domain());
focus.select(".area").attr("d", area);
focus.select(".axis--x").call(xAxis);
focus.selectAll(".circle")
.attr("r", (d)=>{return (d.PTS)})
.attr("cx", (d)=>{return x(d.date)})
.attr("cy", (d)=>{return y(d.PTS)})
context.select(".brush").call(brush.move, x.range().map(t.invertX, t));
}
关于javascript - 尝试使用画笔/缩放在 d3 图表中使用散点图，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/48773281/