Add histogram.js

2026-07-28 11:18:16 +08:00 · 2014-08-02 15:06:16 +02:00
parent 33b0c16d82
commit 7429e489bd
1 changed files with 113 additions and 0 deletions
@@ -0,0 +1,113 @@
+
+function draw_hist(ident, vals) {
+
+    // A formatter for counts.
+    var formatCount = d3.format(",.0f");
+
+    var margin = {top: 10, right: 30, bottom: 30, left: 30},
+        width = 200 - margin.left - margin.right,
+        height = 100 - margin.top - margin.bottom;
+
+    var x = d3.scale.linear()
+        .domain([-5, 5])
+        .range([0, width]);
+
+    // Generate a histogram using twenty uniformly-spaced bins.
+    var data = d3.layout.histogram()
+        .bins(x.ticks(20))
+        (vals);
+
+    var y = d3.scale.linear()
+        .domain([0, d3.max(data, function(d) { return d.y; })])
+        .range([height, 0]);
+
+    var xAxis = d3.svg.axis()
+        .scale(x)
+        .ticks(5)
+        .tickFormat(function(d) { return '';})
+        .orient("bottom");
+
+    var yAxis = d3.svg.axis()
+        .scale(y)
+        .ticks(4)
+        //.tickFormat(function(d) { return ''; })
+        .orient("left");
+
+    var svg = d3.select(ident).append("svg")
+        .attr("width", width + margin.left + margin.right)
+        .attr("height", height + margin.top + margin.bottom)
+      .append("g")
+        .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
+
+    var bar = svg.selectAll(".bar")
+        .data(data)
+        .enter().append("svg:circle")
+        .attr("stroke", "black")
+        .attr("fill", function(d, i) { return "black" })
+        .attr("transform", function(d) { return "translate(" + x(d.x) + "," + y(d.y) + ")"; })
+        .attr("r", function(d, i) { return 1 });
+
+    svg.selectAll(".bar")
+        .data(data)
+        .enter().append("svg:line")
+        .attr("x1", 0)
+        .attr("x2", 0)
+        .attr("y1", function(d) { return y(Math.sqrt(d.y))-60; })
+        .attr("y2", function(d) { return -y(Math.sqrt(d.y))+60; })
+        .attr("transform", function(d) { return "translate(" + x(d.x) + "," + y(d.y) + ")"; })
+        .attr("stroke", "black")
+        .attr("stroke-width", 1)
+
+    svg.selectAll(".bar")
+        .data(data)
+        .enter().append("svg:line")
+        .attr("x1", -2)
+        .attr("x2", 2)
+        .attr("y1", function(d) { return y(Math.sqrt(d.y))-60; })
+        .attr("y2", function(d) { return y(Math.sqrt(d.y))-60; })
+        .attr("transform", function(d) { return "translate(" + x(d.x) + "," + y(d.y) + ")"; })
+        .attr("stroke", "black")
+        .attr("stroke-width", 1)
+
+    svg.selectAll(".bar")
+        .data(data)
+        .enter().append("svg:line")
+        .attr("x1", -2)
+        .attr("x2", 2)
+        .attr("y1", function(d) { return -y(Math.sqrt(d.y))+60; })
+        .attr("y2", function(d) { return -y(Math.sqrt(d.y))+60; })
+        .attr("transform", function(d) { return "translate(" + x(d.x) + "," + y(d.y) + ")"; })
+        .attr("stroke", "black")
+        .attr("stroke-width", 1)
+
+    bar.append("rect")
+        .attr("x", 1)
+        .attr("width", x(data[0].dx))
+        .attr("height", function(d) { return height - y(d.y); });
+
+    svg.append("g")
+        .attr("class", "x axis")
+        .attr("transform", "translate(0," + (height ) + ")")
+        .call(xAxis);
+
+    svg.append("g")
+        .attr("class", "y axis")
+        .attr("transform", "translate(0, 0)")
+        .call(yAxis);
+
+    return svg;
+}
+
+function Histogram(ident) {
+    // TODO: Allow for arbitrary numbers of events
+    this.values = d3.range(1000).map(d3.random.normal(0, 1));
+    this.counter = 0;
+    draw_hist(ident, []);
+
+    this.add_events = function(num) {
+        d3.select(ident).select("svg").remove();
+        draw_hist(ident, this.values.slice(0, this.counter+num));
+        this.counter += num;
+    }
+}
+