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POD3.js enter transition for path not working
 

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  1. POD3.js enter transition for path not working
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    <p>I am using d3 to create a line graph visualization for a bunch of data. The data for the line comes as an array of objects, and I use this function to translate that data into an svg path that can be displayed:</p> <pre><code>this.line = d3.svg.line() .interpolate('linear') // .x(function(d,i) {return x(d['date']);}) .x(function (d,i) {return x(i);}) .y(function (d,i) {return y(d[this.key]) - this.yOffset;}); </code></pre> <p>However, if I leave all my data as a single array of objects (and set that as the only data point for the path), then I will not be able to use enter and exit transitions to add/remove only some segments composing the line if my data set changes size. So, to solve this issue, I use this function to split my array of points into a 2D array: an array of arrays of length 2 that each contain the start and end point for one particular segment of my line, and then I use that array as the data for my path, with each segment on the screen bound separately to its own 2-element array.</p> <p>When I call setData and enter, the path draws exactly as it should. However, when I update the data with the update function (in this case I am transitioning to a longer data set), the path goes through the appropriate update and exit transitions, which shows that my key function that I supplied when binding the data is working as expected. But then when I call enter again, it doesn't just draw the one segment that needs to be added -- instead, it erases the existing path, and redraws the <strong>whole</strong> line, this time including the new segment.</p> <p>Is there something I'm missing here? How do I get it to only animate the drawing of the new segment, and not erase the existing line segments?</p> <p>All relevant code is below -- feel free to comment if I need to clarify more:</p> <p>Thanks in advance!</p> <pre><code>this.line = d3.svg.line() .interpolate('linear') .x(function (d,i) {return x(d['date']);}) .y(function (d,i) {return y(d[this.key]) - this.yOffset;}); this.pathEnterData = function(selection) { this.path = selection.enter().append('path') .attr('class','segment') .attr('d',function(d, i) {return mThis.line(d);}) .style('stroke', mThis.pathColor) .style('stroke-width',2) .style('fill','none'); }; this.pathEnterTransition = function(selection) { return selection .attr("stroke-dasharray", function(d) { var totLength = d3.select(this).node().getTotalLength(); return totLength + " " + totLength; }) .attr("stroke-dashoffset", function(d) { var totLength = d3.select(this).node().getTotalLength(); return totLength; }) .transition() .delay(function(d,i) { return segmentDuration*i; }) .duration(segmentDuration) .ease("linear") .attr('stroke-dashoffset',0); }; this.enterData = function() { this.path.call(this.pathEnterData); }; this.enterTransition = function() { this.path.call(this.pathEnterTransition); }; this.enter = function() { this.enterData(); this.enterTransition(); }; this.exitTransition = function() { this.path.exit().transition() .duration(exitTransitionDuration) .style("stroke-opacity", 0.0) .style("fill-opacity", 0.0) .remove(); }; this.update = function(newData) { this.setData(newData); this.exitTransition(); this.updateTransition(); setTimeout(function() {mThis.enter();},updateTransitionDuration); }; this.updateTransition = function() { this.bubbleCircles.transition() .duration(updateTransitionDuration) .attr("cx", function (d, i) { return x(d['date']); }) .call(mThis.setCircleY); this.bubbleText.transition() .duration(updateTransitionDuration) .attr("x", function (d, i) { return x(d['date']) - (13.0/16)*bubbleNumberSize; }) .call(mThis.setTextY); }; this.setData = function(points) { var splitPoints = new Array(points.length-1); for(var i=0; i&lt;points.length-1; i++) { splitPoints[i] = [points[i],points[i+1]];//{'start':points[i],'end':points[i+1]}; } this.path = this.path.data(splitPoints,function(d,i){return d[1]['date']}); }; </code></pre>
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    1. USAlex Hornbake
    1. USRyan Chipman
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    1. COCould you post the full code? In particular the definitions of `updateTransition` and `mThis`.
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      1. USLars Kotthoff
    2. COUpdated the code with updateTransition -- I won't include full code, since this is just on e part of a >1000 line project, but I think I have all relevant code posted. mThisis just being used to access instance variables within functions; this code is all contained within an object, so it's just for dealing with scope issues
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      1. POD3.js enter transition for path not working
      1. USRyan Chipman
    3. COJust a hunch, by try redefining your selection before calling stuff on it. I found that, if I re-used my older selection that I'd done some operations on earlier, it messed up something in the enter/exit/update pattern. I have no idea why. (I might post a question on it at some point if I have time to cook up a good fiddle.) Also, that is `this`? And what's `this.node()`?
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      1. POD3.js enter transition for path not working
      1. USckersch
 

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