README.md

## README.md

      
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              README.md
            
          
    A bar chart using Mike Bostock's pattern of reusable charts.

  
## index.html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Updatable Charts (3 of 4)</title>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
    <script src="reusableBarChart.js"></script>
    <style>
        body {
            padding: 20px 0 0 10px;
        }
    </style>
</head>
<body>
<div id="weatherHistory"></div>
<br>
<div id="runningHistory"></div>
<script>

    var milesRun = [2, 5, 4, 1, 2, 6, 5];
    var highTemperatures = [77, 71, 82, 87, 84, 78, 80, 84, 86, 72, 71, 68, 75, 73, 80, 85, 86, 80];

    var runningChart = barChart().barPadding(2);

    d3.select('#runningHistory')
            .datum(milesRun)
            .call(runningChart);

    var weatherChart = barChart().fillColor('coral');

    d3.select('#weatherHistory')
            .datum(highTemperatures)
            .call(weatherChart);

</script>
</body>
</html>

## reusableBarChart.js
// Using Mike Bostock's Towards Reusable Charts Pattern
function barChart() {

    // All options that should be accessible to caller
    var width = 900;
    var height = 200;
    var barPadding = 1;
    var fillColor = 'steelblue';

    function chart(selection){
        selection.each(function (data) {
            var barSpacing = height / data.length;
            var barHeight = barSpacing - barPadding;
            var maxValue = d3.max(data);
            var widthScale = width / maxValue;

            d3.select(this).append('svg')
                .attr('height', height)
                .attr('width', width)
                .selectAll('rect')
                .data(data)
                .enter()
                .append('rect')
                .attr('y', function (d, i) { return i * barSpacing })
                .attr('height', barHeight)
                .attr('x', 0)
                .attr('width', function (d) { return d*widthScale})
                .style('fill', fillColor);
        });
    }

    chart.width = function(value) {
        if (!arguments.length) return margin;
        width = value;
        return chart;
    };

    chart.height = function(value) {
        if (!arguments.length) return height;
        height = value;
        return chart;
    };

    chart.barPadding = function(value) {
        if (!arguments.length) return barPadding;
        barPadding = value;
        return chart;
    };

    chart.fillColor = function(value) {
        if (!arguments.length) return fillColor;
        fillColor = value;
        return chart;
    };

    return chart;
}


## thumbnail.png

      
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              thumbnail.png