多线图中的笔刷仅适用于一条线 [英] brush in multiline chart is working for only one line
本文介绍了多线图中的笔刷仅适用于一条线的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在使用多条线图绘制两条线并使用画笔和d3 v4缩放，当我进行画笔绘制时，只有一条线在移动，而另一条线则保持不变.由于我只是自己开始学习这项技术，因此我不知道必须进行哪些更改，以便在笔刷时两条线都可以移动.任何类型的建议都会有很大的帮助.
am working on multi line chart with two lines and with brush and zoom in d3 v4, when i brush my only one line is moving my another line remains constant. Since i have just started learning this on my own i don't have idea on what changes i have to make so that my both lines moves when i brush. Any kind of suggestions would be of a great help.
<!DOCTYPE html>
<meta charset="utf-8">
<style>
.line {
fill: none;
stroke: steelblue;
stroke-width: 1.5px;
}
.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("%Y-%m-%d");
var x = d3.scaleTime().range([0, width]),
y = d3.scaleLinear().range([height, 0]),
//brush
x2 = d3.scaleTime().range([0, width]),
y2 = d3.scaleLinear().range([height2, 0]);
var xAxis = d3.axisBottom(x),
yAxis = d3.axisLeft(y),
//brush
xAxis2 = d3.axisBottom(x2);
//slider that grey selection one
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 line = d3.line()
.x(function (d) { return x(d.date); })
.y(function (d) { return y(d.extra); });
var line1 = d3.line()
.x(function(d) { return x(d.date); })
.y(function(d) { return y(d.Speed); });
//slider line
var line2 = d3.line()
.x(function (d) { return x2(d.date); })
.y(function (d) { return y2(d.Speed); });
var clip = svg.append("defs").append("svg:clipPath")
.attr("id", "clip")
.append("svg:rect")
.attr("width", width)
.attr("height", height)
.attr("x", 0)
.attr("y", 0);
var Line_chart = svg.append("g")
.attr("class", "focus")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")")
.attr("clip-path", "url(#clip)");
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/morley.csv", type, function (error, data) {
if (error) throw error;
data.sort(function(a,b){
return a.date-b.date
});
x.domain(d3.extent(data, function(d) { return d.date; }));
y.domain([0, d3.max(data, function(d) {
return Math.max(d.Speed, d.extra); })]);
//slider
x2.domain(x.domain());
y2.domain(y.domain());
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);
Line_chart.append("path")
.datum(data)
.attr("class", "line")
.style("stroke", "green")
.attr("d", line);
Line_chart.append("path")
.datum(data)
.attr("class", "line")
.style("stroke", "blue")
.attr("d", line1);
//slider line
context.append("path")
.datum(data)
.attr("class", "line")
.attr("d", line2);
context.append("g")
.attr("class", "axis axis--x")
.attr("transform", "translate(0," + height2 + ")")
.call(xAxis2);
//slider
context.append("g")
.attr("class", "brush")
.call(brush)
.call(brush.move, x.range());
svg.append("rect")
.attr("class", "zoom")
.attr("width", width)
.attr("height", height)
.attr("transform", "translate(" + margin.left + "," + margin.top + ")")
.call(zoom);
});
//selection in slider
function brushed() {
if (d3.event.sourceEvent && d3.event.sourceEvent.type === "zoom") return;
var s = d3.event.selection || x2.range();
x.domain(s.map(x2.invert, x2));
Line_chart.select(".line").attr("d", line);
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;
var t = d3.event.transform;
x.domain(t.rescaleX(x2).domain());
Line_chart.select(".line").attr("d", line);
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.extra = +d.extra;
d.Speed=+d.Speed
return d;
}
</script>
推荐答案
在brushed()和zoomed()函数中，您仅在更新绿线(附加日期).您必须标识每一行(例如，使用特定的类)，并使用它们各自的d3.line函数来更新它们:
In the brushed() and zoomed() functions, you are only updating the green line (extra VS. date). You have to identify each line (for example with a specific class), and update both using their respective d3.line functions:
Line_chart.append("path")
.datum(data)
.attr("class", "line line-extra") // <-- class added here
.style("stroke", "green")
.attr("d", line);
Line_chart.append("path")
.datum(data)
.attr("class", "line line-speed") // <-- and here
.style("stroke", "blue")
.attr("d", line1);
[...]
function updateLines() {
Line_chart.select(".line-extra").attr("d", line);
Line_chart.select(".line-speed").attr("d", line1);
}
function brushed() {
[...]
updateLines();
}
function zoomed() {
[...]
updateLines();
}
这篇关于多线图中的笔刷仅适用于一条线的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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