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August 16, 2011 03:21
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Animated Line Graphs / Sparklines 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> | |
| <p> | |
| <b>Size:</b> 300x30 <b>Interpolation:</b> basis <b>Animation:</b> true <b>Transition:</b> 1000ms <b>Update Frequency:</b> 1000ms | |
| <div id="graph1" class="aGraph" style="width:300px; height:30px;"></div> | |
| </p> | |
| <p> | |
| <b>Size:</b> 150x15 <b>Interpolation:</b> basis <b>Animation:</b> true <b>Transition:</b> 1000ms <b>Update Frequency:</b> 1000ms | |
| <div id="graph2" class="aGraph" style="width:150px; height:15px;"></div> | |
| </p> | |
| <p> | |
| <b>Size:</b> 150x15 <b>Interpolation:</b> linear <b>Animation:</b> true <b>Transition:</b> 1000ms <b>Update Frequency:</b> 1000ms | |
| <div id="graph3" class="aGraph" style="width:150px; height:15px;"></div> | |
| </p> | |
| <p> | |
| <b>Size:</b> 150x15 <b>Interpolation:</b> linear <b>Animation:</b> false <b>Transition:</b> 1000ms <b>Update Frequency:</b> 1000ms | |
| <div id="graph4" class="aGraph" style="width:150px; height:15px;"></div> | |
| </p> | |
| <p> | |
| <b>Size:</b> 300x30 <b>Interpolation:</b> basis <b>Animation:</b> true <b>Transition:</b> 750ms <b>Update Frequency:</b> 1500ms | |
| <div id="graph5" class="aGraph" style="width:300px; height:30px;"></div> | |
| </p> | |
| <p> | |
| <b>Size:</b> 300x30 <b>Interpolation:</b> basis <b>Animation:</b> false <b>Transition:</b> 750ms <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> |
Updated the d3.js link to http://mbostock.github.com/d3/d3.v2.js
Hi,
My project is running d3.v3 (version 3). I need to implement the first sample (#graph1) which is smooth while using v2. But, it is not running smooth when I include v3 in the sample. Can you please suggest a solution?? How can I run it smoothly under v3 ??
It's so cool. I am lucky to find it
Thanks for this! I am still learning D3 and this code was awesome. =)
@ankitgautam, it gets worse. Compare...
https://jsfiddle.net/RichardBronosky/o0qfdaL1/ which uses https://d3js.org/d3.v2.js
...to...
https://jsfiddle.net/RichardBronosky/o0qfdaL1/2/ which uses https://d3js.org/d3.v4.js and doesn't work
...to...
https://jsfiddle.net/RichardBronosky/o0qfdaL1/3/ which has been updated according to https://github.com/d3/d3/blob/0730276166e15d2a164cd816906ea17a2a42cfb4/CHANGES.md
Okay, one more. I found that slowing the duration down to 95% made it smooth. Search for 0.95 in...
https://jsfiddle.net/RichardBronosky/o0qfdaL1/4/
I also had to replace ease(d3."linear") with ease(d3.easeLinear) to better match the CHANGES.md above.
thanks a ton. it is useful even now
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