Forgot to add fisheye.js 2 commits ago

lib/fisheye.js

@@ -0,0 +1,45 @@
+(function() {
+  d3.fisheye = function() {
+    var radius = 200,
+        power = 2,
+        k0,
+        k1,
+        center = [0, 0];
+
+    function fisheye(d) {
+      var dx = d.x - center[0],
+          dy = d.y - center[1],
+          dd = Math.sqrt(dx * dx + dy * dy);
+      if (dd >= radius) return {x: d.x, y: d.y, z: 1};
+      var k = k0 * (1 - Math.exp(-dd * k1)) / dd * .75 + .25;
+      return {x: center[0] + dx * k, y: center[1] + dy * k, z: Math.min(k, 10)};
+    }
+
+    function rescale() {
+      k0 = Math.exp(power);
+      k0 = k0 / (k0 - 1) * radius;
+      k1 = power / radius;
+      return fisheye;
+    }
+
+    fisheye.radius = function(_) {
+      if (!arguments.length) return radius;
+      radius = +_;
+      return rescale();
+    };
+
+    fisheye.power = function(_) {
+      if (!arguments.length) return power;
+      power = +_;
+      return rescale();
+    };
+
+    fisheye.center = function(_) {
+      if (!arguments.length) return center;
+      center = _;
+      return fisheye;
+    };
+
+    return rescale();
+  };
+})();