带有比例带标签的平滑滚动画笔
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问题：使用scaleband不能平滑地使用scaleband。
https://shanegibney.github.io/D3-v4-Bar-chart-Scaleband-with-Brush/
以下是在x轴上使用日期进行平滑平移的示例。
https://shanegibney.github.io/d3-Bar-Chart-Pan-And-Zoom/
但这只适用于x域连续的情况。
使用linearscale，我想用数据d.name中的字符串替换x轴上的值。问题是当缩放时，在值之间创建新的刻度。例如，缩放时的值1和2将产生1,1和2和2.5等的值和tciks。这意味着名称不再匹配。
这可以通过两件事来解决;
- 防止在放大时出现新的刻度。我不知道该怎么做。
- 用数据中的d.name替换x轴刻度上的每个标签
这些是我尝试这样做的，
var xAxis = d3.axisBottom(x)
.tickFormat(function(d, i) {
label = data[i].name;
local.set(this, data[i].name);
return "test";
return data[i].name;
return label;
return i;
return d;
});
这些都不起作用。
Plunker
答案
在tickFormat函数内部，检查数字刻度是否对应于data数组中的任何值。如果是，返回name，否则不返回：
var xAxis = d3.axisBottom(x)
.tickFormat(function(d) {
var found = data.find(function(e){
return e.num === d
});
return found ? found.name : null;
})
以下是具有该更改的代码：
<!DOCTYPE html>
<meta charset="utf-8">
<style type="text/css">
body {
font-family: avenir next, sans-serif;
font-size: 12px;
}
.zoom {
cursor: move;
fill: none;
pointer-events: all;
}
.axis {
stroke-width: 0.5px;
stroke: #888;
font: 10px avenir next, sans-serif;
}
.axis>path {
stroke: #888;
}
</style>
<body>
<div id="totalDistance">
</div>
</body>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>
/* Adapted from: https://bl.ocks.org/mbostock/34f08d5e11952a80609169b7917d4172 */
var data = [{
"name": "A",
"date": "2016-11-09 11:15",
"num": "1",
"distance": "1900"
},
{
"name": "B",
"date": "2016-11-10 10:40",
"num": "2",
"distance": "1500"
},
{
"name": "C",
"date": "2016-11-11 16:45",
"num": "3",
"distance": "2500"
},
{
"name": "D",
"date": "2016-11-12 12:48",
"num": "4",
"distance": "2300"
},
{
"name": "E",
"date": "2016-11-15 20:00",
"num": "5",
"distance": "2000"
}
];
var margin = {
top: 20,
right: 20,
bottom: 90,
left: 50
},
margin2 = {
top: 230,
right: 20,
bottom: 30,
left: 50
},
width = 960 - margin.left - margin.right,
height = 300 - margin.top - margin.bottom,
height2 = 300 - margin2.top - margin2.bottom;
var parseTime = d3.timeParse("%Y-%m-%d %H:%M");
var local = d3.local();
var x = d3.scaleLinear().range([0, width]),
x2 = d3.scaleLinear().range([0, width]),
y = d3.scaleLinear().range([height, 0]),
y2 = d3.scaleLinear().range([height2, 0]);
// dur = d3.scaleLinear().range([0, 12]);
var tickLabels = ['a', 'b', 'c', 'd'];
var newData = [];
data.forEach(function(e) {
newData.push({
"name": e.name
});
});
//var xAxis = d3.axisBottom(x).tickSize(0);
var xAxis2 = d3.axisBottom(x2).tickSize(0)
.tickFormat(function(d) {
var found = data.find(function(e) {
return e.num === d
});
return found ? found.name : null;
})
yAxis = d3.axisLeft(y).tickSize(0);
var xAxis = d3.axisBottom(x)
.tickFormat(function(d) {
var found = data.find(function(e) {
return e.num === d
});
if (!found) {
d3.select(this.parentNode).select("line").remove()
}
return found ? found.name : null;
})
// var xAxis = d3.axisBottom(x)
// .tickFormat(function(d, i) {
// label = data[i].name;
// local.set(this, data[i].name);
// return "test";
// return data[i].name;
// return label;
// return i;
// return d;
// });
var brush = d3.brushX()
.extent([
[0, 0],
[width, height2]
])
.on("start brush end", brushed);
var zoom = d3.zoom()
.scaleExtent([1, 10])
.translateExtent([
[0, 0],
[width, height]
])
.extent([
[0, 0],
[width, height]
])
.on("zoom", zoomed);
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.json("data.json", function(error, data) {
// if (error) throw error;
var parseTime = d3.timeParse("%Y-%m-%d %H:%M");
var mouseoverTime = d3.timeFormat("%a %e %b %Y %H:%M");
var minTime = d3.timeFormat("%b%e, %Y");
var parseDate = d3.timeParse("%b %Y");
data.forEach(function(d) {
d.distance = +d.distance;
d.num = +d.num;
return d;
},
function(error, data) {
if (error) throw error;
});
var total = 0;
data.forEach(function(d) {
total = d.distance + total;
});
var minDate = d3.min(data, function(d) {
return d.num;
});
var xMin = d3.min(data, function(d) {
return d.num;
});
var yMax = Math.max(20, d3.max(data, function(d) {
return d.distance;
}));
x.domain([xMin, d3.max(data, function(d) {
return d.num;
})]);
y.domain([0, yMax]);
x2.domain(x.domain());
y2.domain(y.domain());
var rects = focus.append("g");
rects.attr("clip-path", "url(#clip)");
rects.selectAll("rects")
.data(data)
.enter().append("rect")
.style("fill", function(d) {
return "#8DA5ED";
})
.attr("class", "rects")
.attr("x", function(d) {
return x(d.num);
})
.attr("y", function(d) {
return y(d.distance);
})
.attr("width", function(d) {
return 10;
})
.attr("height", function(d) {
return height - y(d.distance);
});
focus.append("g")
.attr("class", "axis x-axis")
.attr("transform", "translate(0," + height + ")")
.call(xAxis);
focus.append("g")
.attr("class", "axis axis--y")
.call(yAxis);
// Summary Stats
focus.append("text")
.attr("transform", "rotate(-90)")
.attr("y", 0 - margin.left)
.attr("x", 0 - (height / 2))
.attr("dy", "1em")
.style("text-anchor", "middle")
.text("Distance in meters");
svg.append("text")
.attr("transform",
"translate(" + ((width + margin.right + margin.left) / 2) + " ," +
(height + margin.top + margin.bottom) + ")")
.style("text-anchor", "middle")
.text("Date");
svg.append("rect")
.attr("class", "zoom")
.attr("width", width)
.attr("height", height)
.attr("transform", "translate(" + margin.left + "," + margin.top + ")")
.call(zoom);
var rects = context.append("g");
rects.attr("clip-path", "url(#clip)");
rects.selectAll("rects")
.data(data)
.enter().append("rect")
.style("fill", function(d) {
return "#8DA5ED";
})
.attr("class", "rects")
.attr("x", function(d) {
return x2(d.num);
})
.attr("y", function(d) {
return y2(d.distance);
})
.attr("width", function(d) {
return 10;
})
.attr("height", function(d) {
return height2 - y2(d.distance);
});
context.append("g")
.attr("class", "axis x-axis")
.attr("transform", "translate(0," + height2 + ")")
.call(xAxis2);
context.append("g")
.attr("class", "brush")
.call(brush)
.call(brush.move, x.range());
// });
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(".rects")
.attr("x", function(d) {
return x(d.num);
})
.attr("y", function(d) {
return y(d.distance);
})
.attr("width", function(d) {
return 10;
})
.attr("height", function(d) {
return height - y(d.distance);
});
focus.select(".x-axis").call(xAxis);
svg.select(".zoom").call(zoom.transform, d3.zoomIdentity
.scale(width / (s[1] - s[0]))
.translate(-s[0], 0));
var e = d3.event.selection;
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