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<!DOCTYPE html> |
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<meta charset="utf-8"> |
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<script src="https://d3js.org/d3.v4.min.js"></script> |
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<svg width="960" height="500"></svg> |
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<style> |
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text { |
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font: bold 48px monospace; |
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} |
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.enter { |
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fill: green; |
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} |
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.update { |
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fill: #333; |
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} |
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.exit { |
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fill: brown; |
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} |
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</style> |
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<script> |
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var svg = d3.select("svg"), |
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width = +svg.attr("width"), |
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height = +svg.attr("height"), |
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g = svg.append("g").attr("transform", "translate(32," + (height / 2) + ")"); |
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var alphabet = "abcdefghijklmnopqrstuvwxyz".split(""); |
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function update(data) { |
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// ---- create a transition func with duration -------------- |
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var t = d3.transition() |
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.duration(750); |
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var text = g.selectAll("text") |
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.data(data, function(d) { return d; }); |
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// ---- transit and remove exiting elements first ---------- |
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text.exit() |
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.attr("class", "exit") |
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// apply transition func variable here |
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.transition(t) |
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// transition to move down 60 px |
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.attr("y", 60) |
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// transition to grow value to transparent |
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.style("fill-opacity", 1e-6) |
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// finally remove it |
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.remove(); |
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text.attr("class", "update") |
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.attr("y", 0) |
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.style("fill-opacity", 1) |
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// above are states applied before transition |
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.transition(t) |
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// during transition, moving to position by index * 32 |
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.attr("x", function(d, i) { return i * 32; }); |
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// ---- update and exit elements are there already, entering elements needs created |
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text.enter().append("text") |
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.attr("class", "enter") |
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.attr("dy", "0.298834868872151em") |
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.attr("y", 0) |
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.attr("x", 0) |
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.style("fill-opacity", 1e-6) |
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.text(function(d) { return d; }) |
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.transition(t) |
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.attr("y", 0) |
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.attr("x", function(d, i) { return i * 32; }) |
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.style("fill-opacity", 1); |
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} |
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update(alphabet); |
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d3.interval(function() { |
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update(d3.shuffle(alphabet) |
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.slice(0, Math.floor(Math.random() * 26)) |
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.sort()); |
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}, 1000); |
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</script> |
