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05_bar_loading_bars.html
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05_bar_loading_bars.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>D3: Loading transitions</title>
<script type="text/javascript" src="d3.js"></script>
<style type="text/css">
body {
background-color: gray;
}
svg {
background-color: white;
}
svg rect {
fill: SteelBlue;
}
svg rect.highlight {
fill: DarkOrange;
}
.axis path,
.axis line {
fill: none;
stroke: black;
shape-rendering: crispEdges;
}
.axis text {
font-family: sans-serif;
font-size: 11px;
}
</style>
</head>
<body>
<script type="text/javascript">
//Width, height, padding
var w = 600;
var h = 250;
var padding = 25;
//Array of dummy data values
var dataset = [ 5, 10, 13, 19, 21, 25, 22, 18, 15, 13,
11, 12, 15, 20, 18, 17, 16, 18, 23, 25 ];
//Configure x and y scale functions
var xScale = d3.scale.ordinal()
.domain(d3.range(dataset.length))
.rangeRoundBands([ padding, w - padding ], 0.05);
var yScale = d3.scale.linear()
.domain([ 0, d3.max(dataset) ])
.rangeRound([ h - padding, padding ]);
//Configure y axis generator
var yAxis = d3.svg.axis()
.scale(yScale)
.orient("left")
.ticks(5);
//Create SVG element
var svg = d3.select("body")
.append("svg")
.attr("width", w)
.attr("height", h);
//Create bars
//…and set initial (default) values
var rects = svg.selectAll("rect")
.data(dataset)
.enter()
.append("rect")
.classed("highlight", function(d) {
if (d > 20) {
return true;
}
return false;
})
.attr("x", function(d, i) {
return xScale(i);
})
.attr("y", function(d) {
//Starting y value for rect is at the
//bottom of the frame (so it can grow "up")
return h - padding;
})
.attr("width", xScale.rangeBand())
.attr("height", 0); //Starting height for all rects is zero
//We re-select the rects, intiate a transition,
//and move their y and height values into place.
rects.transition()
// .delay(function(d, i) { //Uncomment these lines for fun!
// return i * 100; //Set a per-element delay
// })
.duration(1500)
.attr("y", function(d) {
return yScale(d); //Normal y value
})
.attr("height", function(d) {
return h - padding - yScale(d); //Normal height value
});
//Create y axis
svg.append("g")
.attr("class", "axis")
.attr("transform", "translate(" + padding + ",0)")
.call(yAxis);
</script>
</body>
</html>