我正在使用D3js v4。我想要实现的是将根据this示例的笔刷和缩放行为与单击为中心的笔刷相结合，其中单击后笔刷重新居中，并且笔刷边界通过平滑过渡而变圆。到目前为止，这是我的fiddle。
我的问题是，brushended函数永远不会执行。似乎缩放阻止笔刷接收mouseup事件。仅当通过注释掉所有缩放功能完全禁用缩放时，我才开始工作。
我在mousedown上尝试了event.stopPropagation和event.stopImmediatePropagation，如下面的代码片段所示，以防止缩放接收到mousedown和mouseup事件，但是它不起作用。
context.append("g")
.attr("class", "brush")
.call(brush)
.call(brush.move, [x2(new Date(2013, 0, 1)), x2(new Date(2013, 6, 1))])
.selectAll(".overlay")
.each(function(d) {
d.type = "selection";
})
.on("mousedown touchstart", function() { d3.event.stopPropagation(); })
.on("mousedown touchstart", brushcentered)
我是否将stopPropagation放在错误的位置，或者我完全错过了什么？任何帮助，将不胜感激。
最佳答案
哇！您在这里进行了很多事件处理。让我们分解一下，首先是这个调用：
svg.select(".zoom").call(zoom.transform, d3.zoomIdentity
.scale(width / (s[1] - s[0]))
.translate(-s[0], 0));
在
brushed事件处理程序中正在吞噬brushend。我首先想到的是使用简单的setTimeout hack来允许brushend处理。在此过程中，它只是引发了一个新问题，然后将brush.move中的brushedend作为缩放事件引发，而不在brushed中进行处理。因此，我只用缩放替换了移动，然后让缩放事件处理笔刷的位置，如下所示：function brushended() {
if (d3.event.sourceEvent && d3.event.sourceEvent.type === "zoom") return; // ignore brush-by-zoom
if (!d3.event.selection) return; // Ignore empty selections.
var d0 = d3.event.selection.map(x2.invert), //=Datum, linker+rechter Brush-Rand
d1 = d0.map(d3.timeMonth.round);
// If empty when rounded, use floor & ceil instead.
if (d1[0] >= d1[1]) {
d1[0] = d3.timeMonth.floor(d0[0]);
d1[1] = d3.timeMonth.offset(d1[0]);
};
var s = d1.map(x2);
setTimeout(function(){
svg.select(".zoom").call(zoom.transform, d3.zoomIdentity
.scale(width / (s[1] - s[0]))
.translate(-s[0], 0));
});
}
我认为这正在产生您想要的行为。
在下面运行代码和punker here：
<!DOCTYPE html>
<html>
<head>
<script src="https://d3js.org/d3.v4.js"></script>
<style>
#Type1 {
stroke: DarkTurquoise;
}
#Type2 {
stroke: steelblue;
}
.data-line {
fill: none;
stroke-width: 2.5;
opacity: 0.8;
stroke-linecap: round;
clip-path: url(#clip);
transition: 0.5s;
}
.context-line {
fill: none;
stroke-width: 1.5;
stroke: grey;
stroke-linecap: round;
clip-path: url(#clip);
}
div.svg-container {
display: inline-block;
position: relative;
width: 100%;
height: 100%;
vertical-align: top;
}
.zoom {
cursor: move;
fill: none;
pointer-events: all;
}
</style>
</head>
<body>
<div>
</div>
<script>
var svg = d3.select("div")
.append("div").classed("svg-container", true)
.append("svg")
.attr("width", 700)
.attr("height", 400)
var margin = {
top: 20,
right: 20,
bottom: 130,
left: 60
},
margin2 = {
top: 300,
right: 20,
bottom: 30,
left: 60
},
width = +svg.attr("width") - margin.left - margin.right,
height = +svg.attr("height") - margin.top - margin.bottom,
height2 = +svg.attr("height") - margin2.top - margin2.bottom;
// Achsen Datumsbehandlung
var parseDate = d3.timeParse("%Y-%m-%d %H:%M:%S");
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);
//Linien
var line = d3.line()
.x(function(d) {
return x(d.Datum);
})
// .y0(height) //nur area-chType
.y(function(d) {
return y(d.Summe);
});
// .y1(function(d) { return y(d.Summe); }); //nur area-chType
//Linien
var lineType1 = d3.line()
.curve(d3.curveStepAfter)
.x(function(d) {
return x(d.Datum);
})
.y(function(d) {
return y(d.Summe);
});
var line2 = d3.line()
.x(function(d) {
return x2(d.Datum);
})
.y(function(d) {
return y2(d.Summe);
});
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 + ")");
//Zoom & Brush
var brush = d3.brushX()
.extent([
[0, 0],
[width, height2]
])
.handleSize(10)
.on("start brush", brushed)
.on("end", brushended);
var zoom = d3.zoom()
.scaleExtent([1, 100])
.translateExtent([
[0, 0],
[width, height]
])
.extent([
[0, 0],
[width, height]
])
.on("zoom", zoomed);
// ===Daten===
var data = [{
"Datum": "2013-02-04 00:00:00",
"Summe": "1000.00",
"Type": "Type1",
"Notizen": null
}, {
"Datum": "2013-02-04 00:00:00",
"Summe": "200.00",
"Type": "Type2",
"Notizen": null
}, {
"Datum": "2013-02-21 00:00:00",
"Summe": "4000.00",
"Type": "Type1",
"Notizen": null
}, {
"Datum": "2013-02-23 00:00:00",
"Summe": "2000.00",
"Type": "Type1",
"Notizen": null
}, {
"Datum": "2013-02-23 00:00:00",
"Summe": "601.00",
"Type": "Type2",
"Notizen": null
}, {
"Datum": "2013-03-04 00:00:00",
"Summe": "775.00",
"Type": "Type1",
"Notizen": null
}, {
"Datum": "2013-03-04 00:00:00",
"Summe": "1395.10",
"Type": "Type2",
"Notizen": null
}, {
"Datum": "2013-04-03 00:00:00",
"Summe": "400.00",
"Type": "Type1",
"Notizen": null
}, {
"Datum": "2013-04-03 00:00:00",
"Summe": "1040.00",
"Type": "Type2",
"Notizen": null
}, {
"Datum": "2013-05-24 00:00:00",
"Summe": "400.00",
"Type": "Type1",
"Notizen": null
}, {
"Datum": "2013-05-24 00:00:00",
"Summe": "3288.88",
"Type": "Type2",
"Notizen": null
}, {
"Datum": "2013-05-28 00:00:00",
"Summe": "400.00",
"Type": "Type1",
"Notizen": null
}, {
"Datum": "2013-05-28 00:00:00",
"Summe": "4407.10",
"Type": "Type2",
"Notizen": null
}, {
"Datum": "2013-06-01 00:00:00",
"Summe": "400.00",
"Type": "Type1",
"Notizen": null
}, {
"Datum": "2013-06-01 00:00:00",
"Summe": "3525.86",
"Type": "Type2",
"Notizen": null
}, {
"Datum": "2013-06-04 00:00:00",
"Summe": "400.00",
"Type": "Type1",
"Notizen": null
}, {
"Datum": "2013-06-04 00:00:00",
"Summe": "2990.17",
"Type": "Type2",
"Notizen": null
}, {
"Datum": "2013-06-10 00:00:00",
"Summe": "390.00",
"Type": "Type1",
"Notizen": null
}, {
"Datum": "2013-06-10 00:00:00",
"Summe": "366.00",
"Type": "Type2",
"Notizen": null
}, {
"Datum": "2013-06-14 00:00:00",
"Summe": "390.00",
"Type": "Type1",
"Notizen": null
}, {
"Datum": "2013-06-14 00:00:00",
"Summe": "925.18",
"Type": "Type2",
"Notizen": null
}, {
"Datum": "2013-06-16 00:00:00",
"Summe": "708.44",
"Type": "Type1",
"Notizen": null
}, {
"Datum": "2013-06-16 00:00:00",
"Summe": "609.10",
"Type": "Type2",
"Notizen": null
}, {
"Datum": "2013-06-20 00:00:00",
"Summe": "708.44",
"Type": "Type1",
"Notizen": null
}, {
"Datum": "2013-06-20 00:00:00",
"Summe": "1760.80",
"Type": "Type2",
"Notizen": null
}]
data.forEach(function(d) {
d.Datum = parseDate(d.Datum);
d.Summe = +d.Summe;
});
x.domain([d3.min(data, function(d) {
return d.Datum;
}), d3.max(data, function(d) {
return d.Datum;
})]).nice(d3.timeYear);
y.domain([d3.min(data, function(d) {
return d.Summe;
}), 1.1 * d3.max(data, function(d) {
return d.Summe;
})]).nice();
x2.domain(x.domain());
y2.domain(y.domain());
var dataGroup = d3.nest()
.key(function(d) {
return d.Type;
})
.entries(data);
focus.append("rect")
.attr("class", "zoom")
.attr("width", width)
.attr("height", height)
.call(zoom);
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);
focus.selectAll("path#Type2")
.data(dataGroup)
.enter()
.append("path")
.filter(function(d) {
return d.key == "Type2"
})
.attr("class", "data-line")
.attr("d", function(d) {
return line(d.values);
})
.attr("id", function(d) {
return d.key
});
focus.selectAll("path#Type1")
.data(dataGroup)
.enter()
.append("path")
.filter(function(d) {
return d.key == "Type1"
})
.attr("class", "data-line")
.attr("d", function(d) {
return lineType1(d.values);
})
.attr("id", function(d) {
return d.key
});
context.selectAll(".context-line")
.data(dataGroup)
.enter()
.append("path")
.attr("class", "context-line")
.attr("d", function(d) {
return line2(d.values);
});
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, [x2(new Date(2013, 0, 1)), x2(new Date(2013, 6, 1))])
.selectAll(".overlay")
.each(function(d) {
d.type = "selection";
})
.on("mousedown touchstart", brushcentered);
// ===Funktionen===
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.selectAll("path#Type1").attr("d", function(d) {
return lineType1(d.values);
});
focus.selectAll("path#Type2").attr("d", function(d) {
return line(d.values);
});
focus.select(".axis--x").call(xAxis);
setTimeout(function(){
svg.select(".zoom").call(zoom.transform, d3.zoomIdentity
.scale(width / (s[1] - s[0]))
.translate(-s[0], 0));
});
}
function brushcentered() {
var dx = 30, // Use a fixed width when recentering, = ca 2 Monate
cx = d3.mouse(this)[0],
x0 = cx - dx / 2,
x1 = cx + dx / 2;
d3.select(this.parentNode).call(brush.move, x1 > width ? [width - dx, width] : x0 < 0 ? [0, dx] : [x0, x1]);
}
function brushended() {
if (d3.event.sourceEvent && d3.event.sourceEvent.type === "zoom") return; // ignore brush-by-zoom
if (!d3.event.selection) return; // Ignore empty selections.
var d0 = d3.event.selection.map(x2.invert), //=Datum, linker+rechter Brush-Rand
d1 = d0.map(d3.timeMonth.round);
// If empty when rounded, use floor & ceil instead.
if (d1[0] >= d1[1]) {
d1[0] = d3.timeMonth.floor(d0[0]);
d1[1] = d3.timeMonth.offset(d1[0]);
};
var s = d1.map(x2);
setTimeout(function(){
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());
focus.selectAll("path#Type1").attr("d", function(d) {
return lineType1(d.values)
});
focus.selectAll("path#Type2").attr("d", function(d) {
return line(d.values)
});
focus.select(".axis--x").call(xAxis);
context.select(".brush").call(brush.move, x.range().map(t.invertX, t));
}
</script>
</body>
</html>关于javascript - D3js v4笔刷，缩放和最新笔刷，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/45246500/