samples for tributary

bars.js

var w = 600
    , h = 467
var data1 = [
    5,
    20,
    55,
    60,
    89
];

function bars(data)
{
    var max = d3.max(data)

    //nice breakdown of d3 scales
    //http://www.jeromecukier.net/blog/2011/08/11/d3-scales-and-color/
    x = d3.scale.linear()
        .domain([0, max])
        .range([0, w])

    y = d3.scale.ordinal()
        .domain(d3.range(data.length))
        .rangeBands([0, h], .2)

    var vis = d3.select("svg")
    
    //a good written tutorial of d3 selections coming from protovis
    //http://www.jeromecukier.net/blog/2011/08/09/d3-adding-stuff-and-oh-understanding-selections/
    var bars = vis.selectAll("rect.bar")
        .data(data)

    //update
    bars
        .attr("fill", "#0a0")
        .attr("stroke", "#050")

    //enter
    bars.enter()
        .append("svg:rect")
        .attr("class", "bar")
        .attr("fill", "#800")
        .attr("stroke", "#800")


    //exit 
    bars.exit()
        .remove()


    //apply to everything (enter and update)
    bars
        .attr("stroke-width", 4)
        .attr("width", x)
        .attr("height", y.rangeBand())
        .attr("transform", function(d,i) {
            return "translate(" + [0, y(i)] + ")"
        })

}
bars(data1)