add builds per day

index.html

@@ -12,8 +12,15 @@
 		<input id="repo-name" type="text" value="wp-cli/wp-cli" />
 	</form>
 
+	<div class="column">
 		<h2>Build durations over time</h2>
 		<div id="build-times"></div>
+	</div>
+
+	<div class="column">
+		<h2>Builds per day</h2>
+		<div id="build-counts"></div>
+	</div>
 
 	<script src="http://d3js.org/d3.v2.min.js"></script>
 	<script src="script.js"></script>

script.js

@@ -1,4 +1,76 @@
-function renderBuildTimes(selector, data, baseUrl) {
+function renderBuildCounts(container, data) {
+	var valueLabelWidth = 40; // space reserved for value labels (right)
+	var barHeight = 20; // height of one bar
+	var barLabelWidth = 130; // space reserved for bar labels
+	var barLabelPadding = 5; // padding between bar and bar labels (left)
+	var gridLabelHeight = 18; // space reserved for gridline labels
+	var gridChartOffset = 3; // space between start of grid and first bar
+	var maxBarWidth = 420; // width of the bar with the max value
+
+	// accessor functions 
+	var barValue = function(d) { return d.value; };
+
+	// scales
+	var yScale = d3.scale.ordinal().domain(d3.range(0, data.length)).rangeBands([0, data.length * barHeight]);
+	var y = function(d, i) { return yScale(i); };
+	var yText = function(d, i) { return y(d, i) + yScale.rangeBand() / 2; };
+	var x = d3.scale.linear().domain([0, d3.max(data, barValue)]).range([0, maxBarWidth]);
+	// svg container element
+	var chart = d3.select().html('').append("svg")
+	var chart = d3.select(container).html('').append("svg")
+	.attr('width', maxBarWidth + barLabelWidth + valueLabelWidth)
+	.attr('height', gridLabelHeight + gridChartOffset + data.length * barHeight);
+	// grid line labels
+	var gridContainer = chart.append('g')
+	.attr('transform', 'translate(' + barLabelWidth + ',' + gridLabelHeight + ')'); 
+	gridContainer.selectAll("text").data(x.ticks(10)).enter().append("text")
+	.attr("x", x)
+	.attr("dy", -3)
+	.attr("text-anchor", "middle")
+	.text(String);
+	// vertical grid lines
+	gridContainer.selectAll("line").data(x.ticks(10)).enter().append("line")
+	.attr("x1", x)
+	.attr("x2", x)
+	.attr("y1", 0)
+	.attr("y2", yScale.rangeExtent()[1] + gridChartOffset)
+	.style("stroke", "#ccc");
+	// bar labels
+	var labelsContainer = chart.append('g')
+	.attr('transform', 'translate(' + (barLabelWidth - barLabelPadding) + ',' + (gridLabelHeight + gridChartOffset) + ')'); 
+	labelsContainer.selectAll('text').data(data).enter().append('text')
+	.attr('y', yText)
+	.attr("dy", ".35em") // vertical-align: middle
+	.attr('text-anchor', 'end')
+	.text(function(d) { return d.key; });
+
+	// bars
+	var barsContainer = chart.append('g')
+	.attr('transform', 'translate(' + barLabelWidth + ',' + (gridLabelHeight + gridChartOffset) + ')'); 
+	barsContainer.selectAll("rect").data(data).enter().append("rect")
+	.attr('y', y)
+	.attr('height', yScale.rangeBand())
+	.attr('width', function(d) { return x(barValue(d)); })
+	.attr('stroke', 'white')
+	.attr('fill', 'steelblue');
+	// bar value labels
+	barsContainer.selectAll("text").data(data).enter().append("text")
+	.attr("x", function(d) { return x(barValue(d)); })
+	.attr("y", yText)
+	.attr("dx", 3) // padding-left
+	.attr("dy", ".35em") // vertical-align: middle
+	.attr("text-anchor", "start") // text-align: right
+	.attr("fill", "black")
+	.attr("stroke", "none")
+	.text(function(d) { return d3.round(barValue(d), 2); });
+	// start line
+	barsContainer.append("line")
+	.attr("y1", -gridChartOffset)
+	.attr("y2", yScale.rangeExtent()[1] + gridChartOffset)
+	.style("stroke", "#000");
+}
+
+function renderBuildTimes(container, data, baseUrl) {
 	var valueLabelWidth = 40; // space reserved for value labels (right)
 	var barHeight = 20; // height of one bar
 	var barLabelWidth = 50; // space reserved for bar labels
@@ -17,7 +89,7 @@ function renderBuildTimes(selector, data, baseUrl) {
 	var x = d3.scale.linear().domain([0, d3.max(data, barValue)]).range([0, maxBarWidth]);
 	// svg container element
 	var chart = d3.select().html('').append("svg")
-	var chart = d3.select(selector).html('').append("svg")
+	var chart = d3.select(container).html('').append("svg")
 	.attr('width', maxBarWidth + barLabelWidth + valueLabelWidth)
 	.attr('height', gridLabelHeight + gridChartOffset + data.length * barHeight);
 	// grid line labels
@@ -76,6 +148,11 @@ function renderBuildTimes(selector, data, baseUrl) {
 	.style("stroke", "#000");
 }
 
+function getBuildDate(build) {
+	var dt = new Date(Date.parse(build.started_at));
+	return dt.toDateString();
+}
+
 function updateChart() {
 	var repoName = document.getElementById('repo-name').value;
 	var baseUrl = 'https://travis-ci.org/' + repoName + '/builds/';
@@ -87,6 +164,18 @@ function updateChart() {
 	var oldestBuild = Infinity;
 	var i=0, n=15;
 
+	var buildCounts = {};
+
+	function updateCount(build) {
+		var buildDate = getBuildDate(build);
+
+		if (!buildCounts[buildDate]) {
+			buildCounts[buildDate] = 1;
+		} else {
+			buildCounts[buildDate] += 1;
+		}
+	}
+
 	function filterBuilds(rawBuilds) {
 		var curOldestBuild = oldestBuild;
 
@@ -100,12 +189,12 @@ function updateChart() {
 				return;
 			}
 
-			build.started_at = Date.parse(build.started_at);
-
+			updateCount(build);
 			builds.push(build);
 		});
 
 		renderBuildTimes('#build-times', builds, baseUrl);
+		renderBuildCounts('#build-counts', d3.entries(buildCounts), baseUrl);
 
 		if (++i < n && curOldestBuild < oldestBuild) {
 			oldestBuild = curOldestBuild;

style.css

@@ -3,6 +3,11 @@ form {
 	margin-bottom: 10px;
 }
 
+.column {
+	width: 49%;
+	float: left;
+}
+
 .build-nr {
 	fill: blue;
 }