Fire event during a transition
https://github.com/mbostock/d3/wiki/Transitions#wiki-attrTween
https://github.com/mbostock/d3/wiki/Transitions#interpolation
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 400, | |
| parameters = [0.4, 0.3, 0.2, 0.1]; | |
| var x = d3.scale.ordinal() | |
| .domain(parameters) | |
| .rangeRoundBands([0, width], .5); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| svg.append("rect") | |
| .attr("width", x.rangeBand()) | |
| .attr("height", x.rangeBand()) | |
| .attr("x", x) | |
| .attr("y", -x.rangeBand()) | |
| .transition().duration(3000) | |
| .attrTween('y', function(d, i, a){ | |
| var interpolator = d3.interpolate(a, 400); | |
| var halfWayDone = false; | |
| return function(t){ | |
| if (t > .5 && !halfWayDone){ | |
| d3.select('body').append('div').text('halfway done at ' + t); | |
| halfWayDone = true; | |
| } | |
| return interpolator(t); | |
| } | |
| }) | |
| </script> |
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