Change size of bubble in Scatter Plot for c3.js

Question

I have a scatter plot charge where i want to change the size of the dots to make them look like bubble. Can someone show me how to change size of the bubble?

Here is my code:

var chart = c3.generate({
    data: {
        xs: {
            IBM: 'ibm_x',
            Microsoft: 'microsoft_x',
        },

        columns: [
            ["ibm_x", 3.5, 3.0, 3.2, 3.1, 3.6, 3.9, 3.4, 3.4, 2.9, 3.1, 3.7, 3.4, 3.0, 3.0, 4.0, 4.4, 3.9, 3.5, 3.8, 3.8, 3.4, 3.7, 3.6, 3.3, 3.4, 3.0, 3.4, 3.5, 3.4, 3.2, 3.1, 3.4, 4.1, 4.2, 3.1, 3.2, 3.5, 3.6, 3.0, 3.4, 3.5, 2.3, 3.2, 3.5, 3.8, 3.0, 3.8, 3.2, 3.7, 3.3],
            ["microsoft_x", 3.2, 3.2, 3.1, 2.3, 2.8, 2.8, 3.3, 2.4, 2.9, 2.7, 2.0, 3.0, 2.2, 2.9, 2.9, 3.1, 3.0, 2.7, 2.2, 2.5, 3.2, 2.8, 2.5, 2.8, 2.9, 3.0, 2.8, 3.0, 2.9, 2.6, 2.4, 2.4, 2.7, 2.7, 3.0, 3.4, 3.1, 2.3, 3.0, 2.5, 2.6, 3.0, 2.6, 2.3, 2.7, 3.0, 2.9, 2.9, 2.5, 2.8],
            ["IBM", 0.2, 0.2, 0.2, 0.2, 0.2, 0.4, 0.3, 0.2, 0.2, 0.1, 0.2, 0.2, 0.1, 0.1, 0.2, 0.4, 0.4, 0.3, 0.3, 0.3, 0.2, 0.4, 0.2, 0.5, 0.2, 0.2, 0.4, 0.2, 0.2, 0.2, 0.2, 0.4, 0.1, 0.2, 0.2, 0.2, 0.2, 0.1, 0.2, 0.2, 0.3, 0.3, 0.2, 0.6, 0.4, 0.3, 0.2, 0.2, 0.2, 0.2],
            ["Microsoft", 1.4, 1.5, 1.5, 1.3, 1.5, 1.3, 1.6, 1.0, 1.3, 1.4, 1.0, 1.5, 1.0, 1.4, 1.3, 1.4, 1.5, 1.0, 1.5, 1.1, 1.8, 1.3, 1.5, 1.2, 1.3, 1.4, 1.4, 1.7, 1.5, 1.0, 1.1, 1.0, 1.2, 1.6, 1.5, 1.6, 1.5, 1.3, 1.3, 1.3, 1.2, 1.4, 1.2, 1.0, 1.3, 1.2, 1.3, 1.3, 1.1, 1.3],
        ],
        type: 'scatter'
    },
             color: {
        pattern: ['#4C7A9F', '#E25459']
    },

});

setTimeout(function () {
    chart.load({
        columns: [
            ["IBM", 0.2, 0.2, 0.2, 0.2, 0.2, 0.4, 0.3, 0.2, 0.2, 0.1, 0.2, 0.2, 0.1, 0.1, 0.2, 0.4, 0.4, 0.3, 0.3, 0.3, 0.2, 0.4, 0.2, 0.5, 0.2, 0.2, 0.4, 0.2, 0.2, 0.2, 0.2, 0.4, 0.1, 0.2, 0.2, 0.2, 0.2, 0.1, 0.2, 0.2, 0.3, 0.3, 0.2, 0.6, 0.4, 0.3, 0.2, 0.2, 0.2, 0.2],
        ]
    });
}, 1000);

setTimeout(function () {
    chart.load({
        columns: [
            ["IBM", 10.2, 10.2, 10.2, 10.2, 10.2, 11.4, 10.3, 10.2, 10.2, 0.1, 0.2, 0.2, 0.1, 0.1, 0.2, 0.4, 0.4, 0.3, 0.3, 0.3, 0.2, 0.4, 0.2, 0.5, 0.2, 0.2, 0.4, 0.2, 0.2, 0.2, 0.2, 0.4, 0.1, 0.2, 0.2, 0.2, 0.2, 0.1, 0.2, 0.2, 0.3, 0.3, 0.2, 0.6, 0.4, 0.3, 0.2, 0.2, 0.2, 0.2],
        ]
    });
}, 2000);

            setTimeout(function () {
    chart.load({
        columns: [
            ["Microsoft", 10.2, 10.2, 10.2, 10.2, 10.2, 11.4, 10.3, 10.2, 10.2, 10.1, 10.2, 10.2, 10.1, 0.1, 0.2, 0.4, 0.4, 0.3, 0.3, 0.3, 0.2, 0.4, 0.2, 0.5, 0.2, 0.2, 0.4, 0.2, 0.2, 0.2, 0.2, 0.4, 0.1, 0.2, 0.2, 0.2, 0.2, 0.1, 0.2, 0.2, 0.3, 0.3, 0.2, 0.6, 0.4, 0.3, 0.2, 0.2, 0.2, 0.2],
        ]
    });
}, 3000);

This is my FIDDLE. I am basically trying to get my graph to look like this

Answer 1

With c3, if you just want to increase the point size uniformly, just add a property for points and specify the radius

point: {
    r: 15
},

Fiddle - http://jsfiddle.net/3jfe75r8/

---

If you want to make the point size dependent on one of the dimensions you can replace the hardcoded 15 by a function. For instance

point: {
    r: function(d) { 
       return d.value * 5;
    }
},

Notice that I multiplied by a scaling factor of 5, so that the points would be large enough. If your data values are large enough, you actually don't need this scaling factor.

---

If you want to make the point size dependent on both the the dimensions you would do this

point: {
    r: function(d) { 
       return (d.x + d.value) * 5;
    }
},

Or whatever expression that strikes your fancy.

---

If you want to scale the size by one of the dimension, you can define your own scaling function and use that. For instance

var rs = d3.scale.linear()
          .domain([0.01, 5])
          .range([5, 50]);

and then

point: {
    r: function(d) {
        return rs(d.value)
    }
},

Which would scale the radius linearly from 5 to 50 for values from 0.01 to 5.

---

You could also replace 0.01 and 5 by the actual min and max values from your dataset (use d3.min(< < array > >) and d3.max(< < array > >)). If you data is multidimensional, you'll have to flatten it into an array.

If your data changes dynamically either redefine your scaling function or have it depend on the data (vs. values calculated from the data)

Answer 2

d3 size would work for you. For example:

var circle = svg.selectAll("circle")
    .data([32, 57, 293], String);

circle.enter().append("svg:circle")
    .attr("cy", 90)
    .attr("cx", String)
    .attr("r", Math.sqrt);

This can be also a good reference: Link or visit this Gist. The file index_previous.html is an example similar to what you are looking for, simply download the example, the data and remove the "//" from this line:

//bubbles.addMeasureAxis("z", "Delay_per_Flight (minutes)");