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October 12, 2012 09:28
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<!DOCTYPE html> | |
<html> | |
<head> | |
<meta http-equiv="Content-Type" content="text/html;charset=utf-8"> | |
<title>Simple Line Graph using SVG and d3.js</title> | |
<script src="http://mbostock.github.com/d3/d3.v2.js"></script> | |
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js"></script> | |
<script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.23/jquery-ui.min.js"></script> | |
<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.7.2/themes/ui-lightness/jquery-ui.css" type="text/css" media="all" /> | |
<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"></div> | |
<div id="slider-range" style="width: 80%px; margin-left:10%; margin-right:10%"></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 = [0]; | |
for (var i = 1; i < 1000; i++) { | |
var sign = Math.random() > 0.5 ? +1 : -1; | |
data.push(data[i-1] + sign * Math.random()); | |
} | |
// 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([d3.min(data), d3.max(data)]).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().interpolate("monotone") | |
// 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(3); | |
// 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); | |
var clip = graph.append("defs").append("svg:clipPath") | |
.attr("id", "clip") | |
.append("svg:rect") | |
.attr("id", "clip-rect") | |
.attr("x", "0") | |
.attr("y", "0") | |
.attr("width", w) | |
.attr("height", h); | |
// 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 | |
var path = graph.append("svg:path") | |
.attr("class","path") | |
.attr("clip-path", "url(#clip)") | |
.attr("d", line(data)); | |
function zoom(begin, end) { | |
x.domain([begin, end - 1]); | |
var t = graph.transition().duration(0); | |
var size = end - begin; | |
var step = size / 10; | |
var ticks = []; | |
for (var i = 0; i <= 10; i++) { | |
ticks.push(Math.floor(begin + step * i)); | |
} | |
xAxis.tickValues(ticks); | |
t.select(".x.axis").call(xAxis); | |
t.select('.path').attr("d", line(data)); | |
} | |
$(function() { | |
$( "#slider-range" ).slider({ | |
range: true, | |
min: 0, | |
max: 1000, | |
values: [ 0, 1000 ], | |
slide: function( event, ui ) { | |
var begin = d3.min([ui.values[0], data.length]); | |
var end = d3.max([ui.values[1], 0]); | |
console.log("begin:", begin, "end:", end); | |
zoom(begin, end); | |
} | |
}); | |
}); | |
</script> | |
</body> | |
</html> |
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