0
我想創建一個使用畫筆和縮放的條形圖。我想讓圖表在一天內顯示買入價格和賣出價格。到目前爲止，我能夠像這樣添加購買價格https://jsfiddle.net/070yqew2/如何在d3中繪製鏡像的x軸（反轉）條形圖？
我發現this和this作爲與設計相關的有趣圖表。我沒有發現任何想法來實現這一點，任何使用畫筆和縮放顯示鏡像表示的圖都會有所幫助。
<!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>
</body>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>
function randomData(samples) {
var data = [],
random = d3.randomNormal();
for (i = 0; i < samples; i++) {
data.push({
"Date" : new Date("May"+ (i+1)+", 2016 "),
"Buy" : Math.floor(Math.random()*100000),
"Sell" : Math.floor(Math.random()*100000)
});
}
return data;
}
var data = randomData(30);
var xMin = d3.min(data, function(d) { return d["Date"] });
var yMax = Math.max(20, d3.max(data, function(d) { return d["Buy"] }));
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 x = d3.scaleTime().range([0, width]),
x2 = d3.scaleTime().range([0, width]),
y = d3.scaleLinear().range([height, 0]),
y2 = d3.scaleLinear().range([height2, 0]);
x.domain([xMin, new Date()]);
y.domain([0, yMax]);
x2.domain(x.domain());
y2.domain(y.domain());
var xAxis = d3.axisBottom(x).tickSize(0),
xAxis2 = d3.axisBottom(x2).tickSize(0),
yAxis = d3.axisLeft(y).tickSize(0);
var brush = d3.brushX()
.extent([[0, 0], [width, height2]])
.on("brush", brushed);
var zoom = d3.zoom()
.scaleExtent([1, Infinity])
.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 + ")");
var bars = focus.append("g");
bars.attr("clip-path", "url(#clip)");
bars.selectAll("bar")
.data(data)
.enter().append("rect")
.attr('class', 'bar')
.attr('x',function(d) { return x(d["Date"]) })
.attr('y',function(d) { return y(d["Buy"]) })
.attr('width',7)
.attr('height',(d=>height-y(d["Buy"])))
.style("fill","03a63c")
.style("opacity",0.8)
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("bars (in the day)");
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);
// append scatter plot to brush chart area
var bars = context.append("g");
bars.attr("clip-path", "url(#clip)");
bars.selectAll("bar")
.data(data)
.enter().append("rect")
.attr('class', 'barContext')
.attr('x',function(d) { return x2(d["Date"]) })
.attr('y',function(d) { return y2(d["Buy"]) })
.attr('width',2)
.attr('height',(d=>height2-y2(d["Buy"])))
.style("fill","03a63c")
.style("opacity",0.8)
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(".bar")
.attr("x", function(d) { return x(d["Date"]); })
.attr("y", function(d) { return y(d["Buy"]); });
focus.select(".x-axis").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.selectAll(".bar")
.attr("x", function(d) { return x(d["Date"]); })
.attr("y", function(d) { return y(d["Buy"]); });
focus.select(".x-axis").call(xAxis);
context.select(".brush").call(brush.move, x.range().map(t.invertX, t));
};
</script>
我需要的是這樣的
