html D3.js：Barebones十字准线
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<!DOCTYPE html>
<html xmlns:xlink="http://www.w3.org/1999/xlink">
<head>
<title>D3: Crosshair</title>
<style type="text/css">
svg {
font: 11px sans-serif;
}
.line .crosshair {
fill: none;
stroke-width: 1px;
}
.line #crosshairX {
stroke: red;
}
.line #crosshairY {
stroke: blue;
}
.overlay {
fill: none;
stroke: black;
pointer-events: all;
stroke-width: 2px;
}
svg {
shape-rendering: crispEdges;
}
</style>
</head>
<body>
</body>
<script src="//cdnjs.cloudflare.com/ajax/libs/d3/3.4.11/d3.min.js"></script>
<script type="text/javascript">
var generateData = function generateData(size) {
var random = d3.random.normal(0, 100);
var array = [];
for (var i = 0; i < 2; i++) {
array.push([random(), random()]);
}
return array;
};
var renderGraph = function renderGraph(width, height, data) {
// create canvas
var svg = d3.select("body")
.append("svg")
.attr("width", width)
.attr("height", height);
var xDomain = d3.extent(data, function(d) {
return d[0];
});
var yDomain = d3.extent(data, function(d) {
return d[1];
});
var xScale = d3.scale.linear().range([0, width]).domain(xDomain);
var yScale = d3.scale.linear().range([height, 0]).domain(yDomain);
var g = svg.append("g");
var label = g.append("text")
.attr("x", width - 5)
.attr("y", height - 5)
.style("text-anchor", "end");
// create crosshairs
var crosshair = g.append("g")
.attr("class", "line");
// create horizontal line
crosshair.append("line")
.attr("id", "crosshairX")
.attr("class", "crosshair");
// create vertical line
crosshair.append("line")
.attr("id", "crosshairY")
.attr("class", "crosshair");
g.append("rect")
.attr("class", "overlay")
.attr("width", width)
.attr("height", height)
.on("mouseover", function() {
crosshair.style("display", null);
})
.on("mouseout", function() {
crosshair.style("display", "none");
label.text("");
})
.on("mousemove", function() {
var mouse = d3.mouse(this);
var x = mouse[0];
var y = mouse[1];
crosshair.select("#crosshairX")
.attr("x1", mouse[0])
.attr("y1", yScale(yDomain[0]))
.attr("x2", mouse[0])
.attr("y2", yScale(yDomain[1]));
crosshair.select("#crosshairY")
.attr("x1", xScale(xDomain[0]))
.attr("y1", mouse[1])
.attr("x2", xScale(xDomain[1]))
.attr("y2", mouse[1]);
label.text(function() {
return "x=" + x + ", y=" + y;
});
})
.on("click", function() {
console.log(d3.mouse(this));
});;
};
renderGraph(640, 480, generateData(100));
</script>
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