README.md

## README.md

      
        

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              README.md
            
          
        
      
    
  
    Built with blockbuilder.org

forked from sxywu's block: Chase Data: Bar Chart

  

  

## index.html
<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://npmcdn.com/babel-core@5.8.34/browser.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
  <script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.11.2/lodash.js'></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }

    .axis path,
    .axis line {
      fill: none;
      stroke: #000;
      shape-rendering: crispEdges;
    }
  </style>
</head>

<body>
  <input id="loadfile" type="file" multiple />
  <svg></svg>
  <div id='data'></div>
  <script type="text/babel">
    /**************
    * This section modified from @enjalot's block:
    http://bl.ocks.org/enjalot/63d06e2ccadad0cb30dc5f920efd1cdf
    ***************/

    d3.select("#loadfile").node()
      .addEventListener('change', loadFile, false);
    function loadFile(evt) {
      evt.stopPropagation();
    	evt.preventDefault();

      var files;
      if(evt.dataTransfer) {
        files = evt.dataTransfer.files;
      } else {
        files = evt.target.files;
      }
      var i = 0;
      var reader = new FileReader();
      reader.onload = function(e) {
        parseData(e.target.result);

				// start the next
        i += 1;
        files[i] && reader.readAsText(files[i]);
      }

      reader.readAsText(files[i]);
    }

    var allTransactions = [];
    function parseData(result) {
      var transactions = d3.csv.parse(result);
      // go through each transaction
      _.each(transactions, transaction => {
      	if (transaction['Type'] === 'Sale') {
        	allTransactions.push({
          	date: new Date(transaction['Trans Date']),
            amount: -1 * parseFloat(transaction['Amount']),
            title: transaction['Description'],
          });
        }
      });

      updateGraph(allTransactions);
    }

    // draw bar chart
    var width = 900;
    var height = 500;
    var barWidth = 1;
    var padding = {top: 40, left: 20};
    var linearGradient = d3.select('svg').append('defs')
    	.append("linearGradient")
      .attr("id", "linear-gradient")
      .attr({gradientUnits: 'userSpaceOnUse',
      	x1: 0,
        y1: 0,
        x2: 0,
        y2: height - padding.top});
    var svg = d3.select('svg')
    	.attr({width, height})
    	.append('g');
    var timeFormat = d3.time.format('%a %b %e');

    // do da linear gradient
    linearGradient.append("stop")
      .attr("offset", 0)
      .attr("stop-color", "#017351"); // start at red
   /**
    linearGradient.append("stop")
      .attr("offset", '50%')
      .attr("stop-color", "#03c383"); **/
    linearGradient.append("stop")
      .attr("offset", '100%')
      .attr("stop-color", "#aad962"); // end at green

    // initialize scales and axis
    var colorScale = d3.scale.linear()
    	.range(["#aad962", "#03c383", "#017351"]);
    var timeScale = d3.time.scale()
      .range([0, width - padding.left]);
    var xAxis = d3.svg.axis()
      .orient('bottom')
      .scale(timeScale);
    var heightScale = d3.scale.linear()
      .range([0, height - padding.top]);
    var yAxis = d3.svg.axis()
      .orient('left')
      .scale(heightScale);

    // initialize the containers
    var barsG = svg.append('g')
    	.attr('transform', 'translate(' + padding.left + ',0)');
    var xAxisG = svg.append('g')
    	.classed('axis', true)
    	.attr('transform',
      	'translate(' + padding.left + ',' + (height - padding.top) + ')');
    var yAxisG = svg.append('g')
      .classed('axis', true)
    	.attr('transform', 'translate(' + padding.left + ',0)');

    function updateGraph(data) {
    	// first group the data into days
      data = _.chain(data)
      	.groupBy(d => d.date)
        .map((transactions) => {
        	return {
          	date: transactions[0].date,
            transactions: _.sortBy(transactions, t => t.amount),
            total: _.reduce(transactions, (sum, t) => {
            	return t.amount ? sum + t.amount : sum;
            }, 0),
          };
        }).sortBy(d => d.date).value();
      barWidth = Math.floor((width - padding.left) / data.length) - 2;

      // update the scales
      timeScale.domain([data[0].date, _.last(data).date]);
      var maxTotal = d3.max(data, d => d.total);
      heightScale.domain([0, maxTotal]);
      colorScale.domain([0, maxTotal / 2, maxTotal]);

      xAxisG.call(xAxis);
      // yAxisG.call(yAxis);

      var bars = barsG.selectAll('g')
      	.data(data, d => d.date);

      bars.enter().append('g');
      bars.exit().remove();

      bars.attr('transform', d => {
      	return 'translate(' + timeScale(d.date) + ',' +
          (height - padding.top - heightScale(d.total)) + ')';
      });

      var bar = bars.selectAll('rect')
      	.data(d => d.transactions);

      bar.enter().append('rect');
      bar.exit().remove();

      var allY = 0;
      bar.attr({
        x: -barWidth / 2,
        y: (d, i) => {
        	var y = allY;
          allY += heightScale(d.amount);
        	if (!i) {
          	// if this is the first rect
            y = 0;
            allY = heightScale(d.amount);
          }
          return y;
        },
        width: barWidth,
        height: d => heightScale(d.amount),
        fill: d => colorScale(d.amount),
        'fill-opacity': 0.5,
        stroke: d => colorScale(d.amount),
        cursor: 'pointer',
      }).on('mouseover', d => {
        var html = d.title + ' ';
        html += '(' + timeFormat(d.date) + '): ';
        html += '<b>$' + d.amount + '</b><br>';
        d3.select('#data')
          .html(html);
      });

      // move the group to the correct place
      /**
      bars
        .attr({
          width: barWidth,
          height: d => heightScale(d.amount),
          fill: d => colorScale(d.amount),
          stroke: '#fff',
        })
        ;
        **/
    }
  </script>
</body>