Bring voroboids examples up-to-date

examples/voroboids/boid.js

@@ -184,10 +184,10 @@ var boid = (function() {
   }
 
   function d3_ai_boidWrap(position) {
-    if (position[0] > w) position[0] = 0;
-    else if (position[0] < 0) position[0] = w;
-    if (position[1] > h) position[1] = 0;
-    else if (position[1] < 0) position[1] = h;
+    if (position[0] > width) position[0] = 0;
+    else if (position[0] < 0) position[0] = width;
+    if (position[1] > height) position[1] = 0;
+    else if (position[1] < 0) position[1] = height;
   }
 
   function d3_ai_boidGravity(center, position, neighborRadius) {
@@ -207,8 +207,8 @@ var boid = (function() {
   function d3_ai_boidDistance(a, b) {
     var dx = a[0] - b[0],
         dy = a[1] - b[1];
-    if (dx > w / 2) dx = w - dx;
-    if (dy > h / 2) dy = h - dy;
+    if (dx > width / 2) dx = width - dx;
+    if (dy > height / 2) dy = height - dy;
     return Math.sqrt(dx * dx + dy * dy);
   }
 

examples/voroboids/voroboids.js

@@ -1,12 +1,15 @@
-var w = 960,
-    h = 500,
-    mouse = [null, null],
-    fill = d3.scale.linear().domain([0, 1e4]).range(["brown", "steelblue"]);
+var width = 960,
+    height = 500,
+    mouse = [null, null];
+
+var fill = d3.scale.linear()
+    .domain([0, 1e4])
+    .range(["brown", "steelblue"]);
 
 // Initialise boids.
 var boids = d3.range(100).map(function() {
   return boid()
-      .position([Math.random() * w, Math.random() * h])
+      .position([Math.random() * width, Math.random() * height])
       .velocity([Math.random() * 2 - 1, Math.random() * 2 - 1])
       .gravityCenter(mouse);
 });
@@ -20,8 +23,8 @@ d3.select(window).on("blur", nullGravity);
 
 var svg = d3.select("#vis")
   .append("svg")
-    .attr("width", w)
-    .attr("height", h)
+    .attr("width", width)
+    .attr("height", height)
     .attr("class", "PiYG")
     .on("mousemove", function() {
       var m = d3.mouse(this);