simple bar chart based on tutorial

by hrabinowitz

JavaScript

//Width and height
			var w = 500;
			var h = 100;
			var barPadding = 1;
			
			var dataset = [ 5, 10, null, -1, 21, 25, 22, 18, 15, 13,
							11, 12, 15, 20, 18, 17, 16, 18, 23, 25 ];
			
			//Create SVG element
			var svg = d3.select("body")
						.append("svg")
						.attr("width", w)
						.attr("height", h);

			var rects = svg.selectAll("rect")
			   .data(dataset)
			   .enter()
			   .append("rect")
			   .attr("x", function(d, i) {
			   		return i * (w / dataset.length);
			   })
			   .attr("y", function(d) {
			   		return h - (d * 4);
			   })
			   .attr("width", w / dataset.length - barPadding)
			   .attr("height", function(d) {
			   		return d * 4;
			   })
			   .attr("fill", "teal");
                
            var labels = svg.selectAll("text")
                .data(dataset)
                .enter()
                .append("text")
                .text(function(d) {
                    return d;
                })
                .attr("x", function(d, i) {
                    return i * (w / dataset.length) + (w / dataset.length - barPadding) / 2;
                })
               .attr("y", function(d) {
                    return h - (d * 4) + 15;              // +15
               })
               .attr("font-family", "sans-serif")
               .attr("font-size", "11px")
               .attr("fill", "white")
               .attr("text-anchor", "middle");