Skip to content

Instantly share code, notes, and snippets.

@alokkshukla

alokkshukla/README.md

Created July 27, 2017 09:04
Show Gist options
  • Save alokkshukla/5306fdf5684f85d5b768d2bc02013b09 to your computer and use it in GitHub Desktop.
Save alokkshukla/5306fdf5684f85d5b768d2bc02013b09 to your computer and use it in GitHub Desktop.
Download ZIP
Dynamic Bar Chart with Transitions
Raw
README.md

Updates, Transitions, and Motion

Updating Visuals

Not smooth

  • For Bar chart, update dataset and update height, y values.
d3.select("p")
    .on("click", function() {

        //New values for dataset
        dataset = [ 11, 12, 15, 20, 18, 17, 16, 18, 23, 25,
                    5, 10, 13, 19, 21, 25, 22, 18, 15, 13 ];

        //Update all rects
        svg.selectAll("rect")
           .data(dataset)
           .attr("y", function(d) {
                return h - yScale(d);
           })
           .attr("height", function(d) {
                return yScale(d);
           });

    });

Update colors and labels similarly.

Introducing Transitions

                    //Update all rects
                    svg.selectAll("rect")
                        .data(dataset)
						.transition()
                        .delay(function(d, i) {
                            return i * 100;
                        })
						.duration(1000)
						.ease(d3.easeBounceOut)
                        .attr("y", function(d) {
                            return h - yScale(d);
                        })
                        .attr("height", function(d) {
                            return yScale(d);
                        })
                        .attr("fill", function(d) {
                            return "rgb(0,0," + Math.round(d * 10) + ")";
                        });

Ordinal Scales

                var xScale = d3.scaleBand()
							.domain(d3.range(dataset.length))
							.rangeRound([0, w])
							.paddingInner(0.08);
Raw
index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>D3: A flexible, scalable bar chart</title>
<script type="text/javascript" src="https://d3js.org/d3.v4.min.js"></script>
<style type="text/css">
div {
position:absolute;
margin:auto;
}
</style>
</head>
<body>
<div>
<button>Randomise!</button>
</div>
<br>
<script type="text/javascript">
//Width and height
var w = 960;
var h = 500;
var dataset = [ 5, 10, 13, 19, 21, 25, 22, 18, 15, 13,
11, 12, 15, 20, 18, 17, 16, 18, 23, 25,34,36,12,32,56,23,25,34,87,43,54 ];
var xScale = d3.scaleBand()
.domain(d3.range(dataset.length))
.rangeRound([0, w])
.paddingInner(0.08);
var yScale = d3.scaleLinear()
.domain([0, d3.max(dataset)])
.range([50, h]);
//Create SVG element
var svg = d3.select("body")
.append("svg")
.attr("width", w)
.attr("height", h);
//Create bars
svg.selectAll("rect")
.data(dataset)
.enter()
.append("rect")
.attr("x", function(d, i) {
return xScale(i);
})
.attr("y", function(d) {
return h - yScale(d);
})
.attr("width", xScale.bandwidth())
.attr("height", function(d) {
return yScale(d);
})
.attr("fill", function(d) {
return "rgb(0, 0, " + Math.round(d * 10) + ")";
});
//Create labels
svg.selectAll("text")
.data(dataset)
.enter()
.append("text")
.text(function(d) {
return d;
})
.attr("text-anchor", "middle")
.attr("x", function(d, i) {
return xScale(i) + xScale.bandwidth() / 2;
})
.attr("y", function(d) {
if(yScale(d)<=15) {
return h - yScale(d) - 2;
}else{
return h - yScale(d) + 14;
}
})
.attr("font-family", "sans-serif")
.attr("font-size", "11px")
.attr("fill", function (d) {
if(yScale(d)<=15){
return "black"
}else{
return "white";
}
});
//On click, update with new data
d3.select("button")
.on("click", function() {
//New values for dataset
var numValues = dataset.length; //Count original length of dataset
dataset = []; //Initialize empty array
var maxValue = 100;
for (var i = 0; i < numValues; i++) { //Loop numValues times
var newNumber = Math.floor(Math.random() * maxValue); //New random integer (0-24)
dataset.push(newNumber); //Add new number to array
}
yScale.domain([0, d3.max(dataset)]);
//Update all rects
svg.selectAll("rect")
.data(dataset)
.transition()
.delay(function(d, i) {
return i * 100;
})
.duration(1000)
.ease(d3.easeBounceOut)
.attr("y", function(d) {
return h - yScale(d);
})
.attr("height", function(d) {
return yScale(d);
})
.attr("fill", function(d) {
return "rgb(0,0," + Math.round(d * 10) + ")";
});
//Update all labels
svg.selectAll("text")
.data(dataset)
.transition() // <-- Now with
.delay(function(d, i) {
return i * 100;
})
.duration(1000)
.ease(d3.easeCircleIn)
.text(function(d) {
return d;
})
.attr("x", function(d, i) {
return xScale(i) + xScale.bandwidth() / 2;
})
.attr("y", function(d) {
if(yScale(d)<=15) {
return h - yScale(d) - 2;
}else{
return h - yScale(d) + 14;
}
})
.attr("fill", function (d) {
if(yScale(d)<=15){
return "black"
}else{
return "white";
}
});
});
</script>
</body>
</html>
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment