1
我有一個使用d3.js繪製的折線圖，它也帶有工具提示。d3.js - 添加到鼠標移動的圓形不可見
我現在想要的是在鼠標點上有一個圓圈，以便用戶看到他指向的位置。
http://bl.ocks.org/d3noob/6eb506b129f585ce5c8a
我的代碼如下。
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margin = {
top: 20,
right: 60,
bottom: 20,
left: 100
};
var width = 1000,
height = 500;
var vis = d3.select("#line_chart").append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom);
var parseTime = d3.time.format("%Y.%m.%d").parse;
max_y = 0;
min_y = data[0].close;
var extent = d3.extent(data.map(function (d) { return d.date }));
max_x = extent[1];
min = extent[0];
for (i = 0; i < data.length; i++) {
max_y = Math.max(max_y, data[i].close);
min_y = Math.min(min_y, data[i].close);
}
var x = d3.time.scale()
.rangeRound([margin.left, width]);
xScale = x.domain(d3.extent(data, function (d) {
return parseTime(d.date);
}));
yScale = d3.scale.linear().range([height - margin.top, margin.bottom]).domain([0, max_y]),
xAxis = d3.svg.axis()
.scale(xScale),
yAxis = d3.svg.axis()
.scale(yScale)
.orient("left")
.innerTickSize(-width)
.outerTickSize(0)
.tickPadding(10);
vis.append("svg:g")
.attr("class", "x axis")
.style({ 'stroke': 'Black', 'fill': 'none', 'stroke-width': '1px' })
.attr("transform", "translate(0," + (height - margin.bottom) + ")")
.call(xAxis)
.selectAll("text")
.attr("transform", "translate(-10,0) rotate(-40)")
.style("text-anchor", "end");
vis.append("text")
.attr("class", "x label")
.attr("text-anchor", "end")
.attr("x", width + 120)
.attr("y", height - 10)
.attr("font-weight", "bold")
.text("Selected Duration");
vis.append("svg:g")
.attr("class", "y axis")
.style({ 'stroke': 'Black', 'fill': 'none', 'stroke-width': '1px' })
.attr("transform", "translate(" + (margin.left) + ",0)")
.call(yAxis);
vis.append("text")
.attr("class", "y label")
.attr("text-anchor", "end")
.attr("x", margin.left + 5)
.attr("y", margin.top - 2)
.attr("font-weight", "bold")
.text("Portfolio Value ($)");
var line = d3.svg.line()
.x(function (d) {
return xScale(parseTime(d.date));
})
.y(function (d) {
return yScale(d.close);
})
.interpolate("basis");
vis.append('svg:path')
.datum(data)
.attr("fill", "none")
.attr("stroke", "steelblue")
.attr("stroke-linejoin", "round")
.attr("stroke-linecap", "round")
.attr("stroke-width", 1.5)
.attr("d", line);
var hoverLineGroup = vis.append("g")
.attr("class", "hover-line");
var hoverLine = hoverLineGroup.append("line")
.attr("stroke", "#000080")
.attr("stroke-width", "3px")
.attr("x1", 10).attr("x2", 10)
.attr("y1", 0).attr("y2", height);
var hoverTT = hoverLineGroup.append('text')
.attr("class", "hover-tex capo")
.attr('dy', "0.35em");
var hoverTT2 = hoverLineGroup.append('text')
.attr("class", "hover-text capo")
.attr('dy', "0.55em");
hoverLineGroup.style("opacity", 1e-6);
vis.on("mouseout", hoverMouseOff)
.on("mousemove", hoverMouseOn);
var bisectDate = d3.bisector(function (d) { return parseTime(d.date); }).left;
function hoverMouseOn() {
var mouse_x = d3.mouse(this)[0];
var mouse_y = d3.mouse(this)[1];
var graph_y = yScale.invert(mouse_y);
var graph_x = xScale.invert(mouse_x);
var mouseDate = xScale.invert(mouse_x);
var i = bisectDate(data, mouseDate);
var d0 = data[i - 1]
var d1 = data[i];
var d = mouseDate - d0[0] > d1[0] - mouseDate ? d1 : d0;
hoverTT.text("Date: " + d.date);
hoverTT.attr('x', mouse_x);
hoverTT.attr('y', yScale(d.close));
hoverTT2.text("Portfolio Value: " + Math.round(d.close * 100)/100)
.attr('x', mouse_x)
.attr('y', yScale(d.close) + 10);
hoverLine.attr("x1", mouse_x).attr("x2", mouse_x)
hoverLineGroup.style({ 'font-weight': 'bold', 'opacity': 1 });
hoverLine.append("circle")
.attr("class", "y")
.style("fill", "none")
.style("stroke", "blue")
.attr("r", 40)
.attr('x', mouse_x)
.attr('y', yScale(d.close) + 20);
}
function hoverMouseOff() {
hoverLineGroup.style("opacity", 1e-6);
}
</script>
如果你看到我已經附加了一圈的hoverLine，但仍是圈子是不可見的。
有人能幫我找出問題所在嗎？