score:0

The short guide.

  1. Use stack for the original data set.
  2. Use special settings of D3 scale to create a second data set with logarithmic values.
  3. Use stack again for the resulting set.
// Original linear data
var linData = [
    [
        { x: 0, y:     0.1 },
        { x: 1, y:     1.0 },
        { x: 2, y:   100.0 },
        { x: 3, y: 10000.0 }
    ],
    [
        { x: 0, y:     0.2 },
        { x: 1, y:     2.0 },
        { x: 2, y:   200.0 },
        { x: 3, y: 20000.0 }
    ],
    [
        { x: 0, y:     0.3 },
        { x: 1, y:     3.0 },
        { x: 2, y:   300.0 },
        { x: 3, y: 30000.0 }
    ]
];


// Calculating y0 for linear data
var stack = d3.layout.stack();
stack(linData);

// Setting conversion values from linear to logarithmic without scaling
var yScaleLog = d3.scale.log()
        .domain([0.01,
            d3.max(linData, function(d) {
                return d3.max(d, function(d) {
                    return d.y0 + d.y;
                });
            })
        ])
        .range([0,
            d3.max(linData, function(d) {
                return d3.max(d, function(d) {
                    return d.y0 + d.y;
                });
            })
        ]);

// Creating new set of data with logarithmized values
var logData = [];
for (var i = 0; i < linData.length; i++) {
    logData[i] = [];
    for (var j = 0; j < linData[i].length; j++) {
        logData[i][j] = {
            x: linData[i][j].x,
            y: yScaleLog(linData[i][j].y)
        };
    }
}

// Calculating y0 for logarithmic data
stack(logData);

Full code: http://jsfiddle.net/romanshamin/5vF6a/2/

score:1

I think it would be helpful for you to start out with a basic (non-stacked) bar chart with a logarithmic scale --

You will want to give your scale representation a name, such as:

var myscale = d3.scale.log().domain([minNum,maxNum]).range([height,0]);

Then use this scale later to change to screen space, for example:

.attr("height", function(d) {return myscale(d);})

Here is a basic example for you to look over: http://jsfiddle.net/jsl6906/qAHC2/10/

score:2

I ran into this super old thread, here's info on why a log scale almost never makes sense for stacked bars, and rarely for regular bar charts or area charts (ie. charts with shapes that have a base)

enter image description here


Related Query

More Query from same tag