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Created February 21, 2012 00:29
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Animated Line Graphs / Sparklines using SVG Path and d3.js
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index.html
<html>
<head>
<title>Animated Sparkline using SVG Path and d3.js</title>
<script src="https://raw.github.com/mbostock/d3/master/d3.v2.min.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;
}
</style>
</head>
<body>
<p>
<b>Size:</b> 300x30 &nbsp;&nbsp;<b>Interpolation:</b> basis &nbsp;&nbsp;<b>Animation:</b> true &nbsp;&nbsp;<b>Transition:</b> 1000ms &nbsp;&nbsp;<b>Update Frequency:</b> 1000ms
<div id="graph1" class="aGraph" style="width:300px; height:30px;"></div>
</p>
<p>
<b>Size:</b> 150x15 &nbsp;&nbsp;<b>Interpolation:</b> basis &nbsp;&nbsp;<b>Animation:</b> true &nbsp;&nbsp;<b>Transition:</b> 1000ms &nbsp;&nbsp;<b>Update Frequency:</b> 1000ms
<div id="graph2" class="aGraph" style="width:150px; height:15px;"></div>
</p>
<p>
<b>Size:</b> 150x15 &nbsp;&nbsp;<b>Interpolation:</b> linear &nbsp;&nbsp;<b>Animation:</b> true &nbsp;&nbsp;<b>Transition:</b> 1000ms &nbsp;&nbsp;<b>Update Frequency:</b> 1000ms
<div id="graph3" class="aGraph" style="width:150px; height:15px;"></div>
</p>
<p>
<b>Size:</b> 150x15 &nbsp;&nbsp;<b>Interpolation:</b> linear &nbsp;&nbsp;<b>Animation:</b> false &nbsp;&nbsp;<b>Transition:</b> 1000ms &nbsp;&nbsp;<b>Update Frequency:</b> 1000ms
<div id="graph4" class="aGraph" style="width:150px; height:15px;"></div>
</p>
<p>
<b>Size:</b> 300x30 &nbsp;&nbsp;<b>Interpolation:</b> basis &nbsp;&nbsp;<b>Animation:</b> true &nbsp;&nbsp;<b>Transition:</b> 750ms &nbsp;&nbsp;<b>Update Frequency:</b> 1500ms
<div id="graph5" class="aGraph" style="width:300px; height:30px;"></div>
</p>
<p>
<b>Size:</b> 300x30 &nbsp;&nbsp;<b>Interpolation:</b> basis &nbsp;&nbsp;<b>Animation:</b> false &nbsp;&nbsp;<b>Transition:</b> 750ms &nbsp;&nbsp;<b>Update Frequency:</b> 1500ms
<div id="graph6" class="aGraph" style="width:300px; height:30px;"></div>
</p>
<script>
function displayGraphExample(id, width, height, interpolation, animate, updateDelay, transitionDelay) {
// create an SVG element inside the #graph div that fills 100% of the div
var graph = d3.select(id).append("svg:svg").attr("width", "100%").attr("height", "100%");
// 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, 1, 3, 8, 9, 2, 5, 9, 3, 6, 3, 6, 2, 7, 5, 2, 1, 3, 8, 9, 2, 5, 9, 2, 7, 5, 2, 1, 3, 8, 9, 2, 5, 9, 3, 6, 2, 7, 5, 2, 1, 3, 8, 9, 2, 9];
// X scale will fit values from 0-10 within pixels 0-100
var x = d3.scale.linear().domain([0, 48]).range([-5, width]); // starting point is -5 so the first value doesn't show and slides off the edge as part of the transition
// Y scale will fit values from 0-10 within pixels 0-100
var y = d3.scale.linear().domain([0, 10]).range([0, height]);
// create a line object that represents the SVN line we're creating
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);
})
.interpolate(interpolation)
// display the line by appending an svg:path element with the data line we created above
graph.append("svg:path").attr("d", line(data));
// or it can be done like this
//graph.selectAll("path").data([data]).enter().append("svg:path").attr("d", line);
function redrawWithAnimation() {
// update with animation
graph.selectAll("path")
.data([data]) // set the new data
.attr("transform", "translate(" + x(1) + ")") // set the transform to the right by x(1) pixels (6 for the scale we've set) to hide the new value
.attr("d", line) // apply the new data values ... but the new value is hidden at this point off the right of the canvas
.transition() // start a transition to bring the new value into view
.ease("linear")
.duration(transitionDelay) // for this demo we want a continual slide so set this to the same as the setInterval amount below
.attr("transform", "translate(" + x(0) + ")"); // animate a slide to the left back to x(0) pixels to reveal the new value
/* thanks to 'barrym' for examples of transform: https://gist.github.com/1137131 */
}
function redrawWithoutAnimation() {
// static update without animation
graph.selectAll("path")
.data([data]) // set the new data
.attr("d", line); // apply the new data values
}
setInterval(function() {
var v = data.shift(); // remove the first element of the array
data.push(v); // add a new element to the array (we're just taking the number we just shifted off the front and appending to the end)
if(animate) {
redrawWithAnimation();
} else {
redrawWithoutAnimation();
}
}, updateDelay);
}
displayGraphExample("#graph1", 300, 30, "basis", true, 1000, 1000);
displayGraphExample("#graph2", 150, 15, "basis", true, 1000, 1000);
displayGraphExample("#graph3", 150, 15, "linear", true, 1000, 1000);
displayGraphExample("#graph4", 150, 15, "linear", false, 1000, 1000);
displayGraphExample("#graph5", 300, 30, "basis", true, 1500, 750);
displayGraphExample("#graph6", 300, 30, "basis", false, 1500, 750);
</script>
</body>
</html>
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