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August 15, 2011 23:59
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Animated Sparkline using SVG Path and d3.js
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| <html> | |
| <head> | |
| <title>Animated Sparkline using SVG Path 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; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div id="graph" class="aGraph" style="position:absolute;top:10px;left:10px; float:left; width:300px; height:30px;"></div> | |
| <script> | |
| // create an SVG element inside the #graph div that fills 100% of the div | |
| var graph = d3.select("#graph").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, 300]); // 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, 30]); | |
| // 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("basis") | |
| // 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(1000) // 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) | |
| redrawWithAnimation(); | |
| //redrawWithoutAnimation(); | |
| }, 1000); | |
| </script> | |
| </body> | |
| </html> |
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Updated the d3.js link to http://mbostock.github.com/d3/d3.v2.js