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meilivh/.block

Last active May 6, 2017 18:02
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Update Pattern Bar Chart
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.block
license: mit
Raw
index.html
<!DOCTYPE html>
<head>
<meta charset="utf-8">
<script src="https://d3js.org/d3.v4.min.js"></script>
<style>
.enter {
fill: green;
}
.update {
fill: #333;
}
body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
</style>
</head>
<body>
<div id="chart" width=1000 height=300></div>
<script>
var myData = [1,2,3,4,5,6,7,8,9,0];
var svg = d3.select("#chart")
.append('svg')
.attr('width',500)
.attr('height',200)
.attr("transform", "translate(300,100)");
function update(data) {
let BAR_WIDTH = 30;
var y = d3.scaleLinear()
.domain([0,d3.max(data)])
.range([200,0]);
rects = svg.selectAll('rect')
.data(data);
// Update
rects.attr('class','update');
// Enter
rects.enter().append('rect')
.attr('class','enter')
.attr('x',function(d,i) {
return i * (BAR_WIDTH+2)
})
.attr('width',BAR_WIDTH)
.attr('height',200)
.attr('y',200)
.merge(rects)
.transition()
.duration(1000)
.attr('y', function (d,i) {
return y(d);
});
rects.exit()
.transition()
.duration(1000)
.attr('y',200)
.remove();
}
update(myData);
d3.interval(function(){
return update(myData.slice(0,Math.random()*myData.length));
}, 1500)
</script>
</body>
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