【发布时间】：2013-12-13 09:20:32
【问题描述】：
我正在使用 d3 库来绘制折线图。
以下是我生成折线图的代码。
<html>
<head>
<title>Simple Line Graph using SVG and d3.js</title>
<script src="http://mbostock.github.com/d3/d3.v2.js"></script>
<style>
/* tell the SVG path to be a thin blue line without any area fill */
path {
stroke: steelblue;
stroke-width: 1;
fill: none;
}
.axis {
shape-rendering: crispEdges;
}
.x.axis line {
stroke: lightgrey;
}
.x.axis .minor {
stroke-opacity: .5;
}
.x.axis path {
display: none;
}
.y.axis line, .y.axis path {
fill: none;
stroke: #000;
}
</style>
</head>
<body>
<div id="graph" class="aGraph" style="position:absolute;top:0px;left:0; float:left;"></div>
<script>
/* implementation heavily influenced by http://bl.ocks.org/1166403 */
// define dimensions of graph
var m = [80, 80, 80, 80]; // margins
var w = 1000 - m[1] - m[3]; // width
var h = 400 - m[0] - m[2]; // height
// create a simple data array that we'll plot with a line (this array represents only the Y values, X will just be the index location)
var data = [3, 6, 2, 7, 5, 2, 0, 3, 8, 9, 2, 5, 9, 3, 6, 3, 6, 2, 7, 5, 2, 1, 3, 8, 9, 2, 5, 9, 2, 7];
// X scale will fit all values from data[] within pixels 0-w
var x = d3.scale.linear().domain([0, data.length]).range([0, w]);
// Y scale will fit values from 0-10 within pixels h-0 (Note the inverted domain for the y-scale: bigger is up!)
var y = d3.scale.linear().domain([0, 10]).range([h, 0]);
// automatically determining max range can work something like this
// var y = d3.scale.linear().domain([0, d3.max(data)]).range([h, 0]);
// create a line function that can convert data[] into x and y points
var line = d3.svg.line()
// assign the X function to plot our line as we wish
.x(function(d, i) {
// verbose logging to show what's actually being done
console.log('Plotting X value for data point: ' + d + ' using index: ' + i + ' to be at: ' + x(i) + ' using our xScale.');
// return the X coordinate where we want to plot this datapoint
return x(i);
})
.y(function(d) {
// verbose logging to show what's actually being done
console.log('Plotting Y value for data point: ' + d + ' to be at: ' + y(d) + " using our yScale.");
// return the Y coordinate where we want to plot this datapoint
return y(d);
})
// Add an SVG element with the desired dimensions and margin.
var graph = d3.select("#graph").append("svg:svg")
.attr("width", w + m[1] + m[3])
.attr("height", h + m[0] + m[2])
.append("svg:g")
.attr("transform", "translate(" + m[3] + "," + m[0] + ")");
// create yAxis
var xAxis = d3.svg.axis().scale(x).tickSize(-h).tickSubdivide(true);
// Add the x-axis.
graph.append("svg:g")
.attr("class", "x axis")
.attr("transform", "translate(0," + h + ")")
.call(xAxis);
// create left yAxis
var yAxisLeft = d3.svg.axis().scale(y).ticks(4).orient("left");
// Add the y-axis to the left
graph.append("svg:g")
.attr("class", "y axis")
.attr("transform", "translate(-25,0)")
.call(yAxisLeft);
// Add the line by appending an svg:path element with the data line we created above
// do this AFTER the axes above so that the line is above the tick-lines
graph.append("svg:path").attr("d", line(data));
var line1 = graph.append('line')
.attr('transform', 'translate(100, 50)')
.attr({'x1': 0, 'y1': 0, 'x2': 0, 'y2': 1400})
.attr('class', 'selection_line');
graph.on('mousemove', function(e) {
var navigatorVersion = navigator.appVersion;
var navigatorAgent = navigator.userAgent;
var browserName = navigator.appName;
var fullVersionName = '' + parseFloat(navigator.appVersion);
var majorVersionName = parseInt(navigator.appVersion, 10);
var nameOffset, verOffset, ix;
// In Firefox, the true version is after "Firefox"
//To make line scroll horizontally in mozilla firefox use following code
if ((verOffset = navigatorAgent.indexOf("Firefox")) != -1) {
browserName = "Firefox";
fullVersionName = navigatorAgent.substring(verOffset + 8);
}
if (browserName == "Firefox") {
line1.attr("x1", d3.event.clientX - 100);
line1.attr("x2", d3.event.clientX - 100);
}
else {
line1.attr("x1", d3.event.x - 100);
line1.attr("x2", d3.event.x - 100);
}
});
</script>
</body>
</html>
在鼠标移动时，我想用鼠标移动一条垂直线，并想找到垂直线与折线图的交点。即找到垂直线与图形相交的折线图的x和y坐标。
知道为什么它不起作用吗？
【问题讨论】：
-
This question 应该会有所帮助。
-
那个错误，没有任何上下文，没有告诉我任何事情。
-
我认为是因为这条线。 var div_width = parseInt(d3.select('body').style('width').replace('px', ''));
-
好的，那么您是否尝试过替换该行以查看是否可以正常工作？
-
我试过删除这两行 var div_width = parseInt(d3.select('body').style('width').replace('px','')); var graph_width = (div_width > 695) ? div_width：695；错误消失了，但图表不显示
标签： javascript jquery d3.js