我有一个图表，我需要一个参考线，鼠标光标在这个图表内的任何地方。这条参考线将跟随图表内的鼠标移动。
但这似乎不能正常工作。它仅适用于轴和轴的刻度线（.axis 线）。在调试时，我发现鼠标事件在应用于 SVG 但在组上时工作正常，为什么会这样？
这是我的代码：
测试.html
<html>
<head>
<script src="jquery.js">
</script>
<script src="d3.v2.js">
</script>
<script src="retest.js">
</script>
<style type="text/css">
.g_main {
cursor:pointer;
}
.axis path, .axis line {
stroke: #DBDBDB;
/*shape-rendering: crispEdges;
*/
}
.y g:first-child text {
display:none;
}
.y g:first-child line {
stroke: #989898 ;
stroke-width: 2.5px;
}
/*.x g:first-child line {
stroke: black ;
stroke-width: 2.5px;
}
*/
.y path {
stroke: #989898 ;
stroke-width: 2.5px;
}
</style>
</head>
<body>
<center>
<button id="reload" onclick="loadViz();">
load Graph
</button>
<div id="viz" class="viz">
</div>
</center>
<script>
loadViz();
</script>
</body>
</html>
重新测试.js
var series,
classifications,
minVal,
maxVal,
svgW = 600,
svgH = 600,
//w = 1200,
//h = 1200,
vizPadding = {
top: 120,
right: 30,
bottom: 120,
left: 50
},
yAxMin_PA = 0,
yAxMax_PA = 50,
xAxMin_PA = 2002,
xAxMax_PA = 2008,
areaStrokeColors = ['#FF6600', '#3366FF', '#B8860B', '#458B00', 'white'];
var loadViz = function () {
color = d3.scale.category10();
data = {
"lines": [{
"line": [{
"X": 2002,
"Y": 42
}, {
"X": 2003,
"Y": 45
},
{
"X": 2005,
"Y": 47
},
{
"X": 2007,
"Y": 41
}
]
}, {
"line": [{
"X": 2003,
"Y": 33
}, {
"X": 2005,
"Y": 38
}, {
"Y": 36,
"X": 2008
}
]
}, {
"line": [{
"X": 2004,
"Y": 13
}, {
"X": 2005,
"Y": 19
}, {
"X": 2008,
"Y": 21
}
]
}, {
"line": [{
"X": 2003,
"Y": 20
}, {
"X": 2005,
"Y": 27
}, {
"X": 2008,
"Y": 29
}
]
}
]
};
$("#viz").html("");
buildBase();
//setScales();
};
var buildBase = function () {
margin = {
top: 80,
right: 120,
bottom: 40,
left: 40
},
width = 960 - margin.left - margin.right,
height = 550 - margin.top - margin.bottom;
t2 = height + margin.top + margin.bottom;
x = d3.scale.linear()
.domain([xAxMin_PA, xAxMax_PA])
.range([0, width]);
y = d3.scale.linear()
.domain([yAxMin_PA, yAxMax_PA])
.range([height, 0]);
tickSizeToApplyX = 5;
tickSizeToApplyY = 10;
// Function to draw X-axis
xAxis = d3.svg.axis()
.scale(x)
.ticks(tickSizeToApplyX)
.tickSize(-height, 0, 0)
//.tickSize(10)
.orient("bottom")
.tickPadding(5);
// Function to draw Y-axis
yAxis = d3.svg.axis()
.scale(y)
.ticks(tickSizeToApplyY)
.tickSize(-width, 0, 0)
//.tickSize(0)
.orient("left")
.tickPadding(5);
// Define the line
var valueline = d3.svg.line()
.x(function (d) { /*console.log(d.X);*/
return x(d.X);
})
.y(function (d) { /*console.log(d.Y);*/
return y(d.Y);
});
// Define the line
var referline = d3.svg.line()
.x(function (dx) { /*console.log(d.X);*/
return dx;
})
.y(function (dy) { /*console.log(d.Y);*/
return dy;
});
// Append SVG into the html
var viz = d3.select("#viz")
.append("svg")
.attr("width", width + margin.left + margin.right + 10)
.attr("height", height + margin.top + margin.bottom)
.append("g")
.attr("class", "g_main")
.attr("transform", "translate(" + margin.left + "," + ((margin.top) - 30) + ")");
viz.on("mousemove", function () {
cx = d3.mouse(this)[0];
cy = d3.mouse(this)[1];
console.log("xx=>" + cx + "yy=>" + cy);
redrawline(cx, cy);
})
.on("mouseover", function () {
d3.selectAll('.line_over').style("display", "block");
})
.on("mouseout", function () {
d3.selectAll('.line_over').style("display", "none");
});
//console.log(this);
viz.append("line")
//d3.select("svg").append("line")
.attr("class", 'line_over')
.attr("x1", 0)
.attr("y1", 0)
.attr("x2", x(xAxMax_PA))
.attr("y2", 0)
.style("stroke", "gray")
.attr("stroke-dasharray", ("5,5"))
.style("stroke-width", "1.5")
.style("display", "none");
// Draw X-axis
viz.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + height + ")")
.call(xAxis);
// Draw Y-axis
viz.append("g")
.attr("class", function (d, i) {
return "y axis"
})
.call(yAxis);
function redrawline(cx, cy) {
d3.selectAll('.line_over')
.attr("x1", 0)
.attr("y1", cy)
.attr("x2", x(xAxMax_PA))
.attr("y2", cy)
.style("display", "block");
}
};