Add d3.hive plugin.

d3.hive.v0.js

@@ -0,0 +1,80 @@
+d3.hive = {};
+
+d3.hive.link = function() {
+  var source = function(d) { return d.source; },
+      target = function(d) { return d.target; },
+      angle = function(d) { return d.angle; },
+      startRadius = function(d) { return d.radius; },
+      endRadius = startRadius,
+      arcOffset = -Math.PI / 2;
+
+  function link(d, i) {
+    var s = node(source, this, d, i),
+        t = node(target, this, d, i),
+        x;
+    if (t.a < s.a) x = t, t = s, s = x;
+    if (t.a - s.a > Math.PI) s.a += 2 * Math.PI;
+    var a1 = s.a + (t.a - s.a) / 3,
+        a2 = t.a - (t.a - s.a) / 3;
+    return s.r0 - s.r1 || t.r0 - t.r1
+        ? "M" + Math.cos(s.a) * s.r0 + "," + Math.sin(s.a) * s.r0
+        + "L" + Math.cos(s.a) * s.r1 + "," + Math.sin(s.a) * s.r1
+        + "C" + Math.cos(a1) * s.r1 + "," + Math.sin(a1) * s.r1
+        + " " + Math.cos(a2) * t.r1 + "," + Math.sin(a2) * t.r1
+        + " " + Math.cos(t.a) * t.r1 + "," + Math.sin(t.a) * t.r1
+        + "L" + Math.cos(t.a) * t.r0 + "," + Math.sin(t.a) * t.r0
+        + "C" + Math.cos(a2) * t.r0 + "," + Math.sin(a2) * t.r0
+        + " " + Math.cos(a1) * s.r0 + "," + Math.sin(a1) * s.r0
+        + " " + Math.cos(s.a) * s.r0 + "," + Math.sin(s.a) * s.r0
+        : "M" + Math.cos(s.a) * s.r0 + "," + Math.sin(s.a) * s.r0
+        + "C" + Math.cos(a1) * s.r1 + "," + Math.sin(a1) * s.r1
+        + " " + Math.cos(a2) * t.r1 + "," + Math.sin(a2) * t.r1
+        + " " + Math.cos(t.a) * t.r1 + "," + Math.sin(t.a) * t.r1;
+  }
+
+  function node(method, thiz, d, i) {
+    var node = method.call(thiz, d, i),
+        a = +(typeof angle === "function" ? angle.call(thiz, node, i) : angle) + arcOffset,
+        r0 = +(typeof startRadius === "function" ? startRadius.call(thiz, node, i) : startRadius),
+        r1 = (startRadius === endRadius ? r0 : +(typeof endRadius === "function" ? endRadius.call(thiz, node, i) : endRadius));
+    return {r0: r0, r1: r1, a: a};
+  }
+
+  link.source = function(_) {
+    if (!arguments.length) return source;
+    source = _;
+    return link;
+  };
+
+  link.target = function(_) {
+    if (!arguments.length) return target;
+    target = _;
+    return link;
+  };
+
+  link.angle = function(_) {
+    if (!arguments.length) return angle;
+    angle = _;
+    return link;
+  };
+
+  link.radius = function(_) {
+    if (!arguments.length) return startRadius;
+    startRadius = endRadius = _;
+    return link;
+  };
+
+  link.startRadius = function(_) {
+    if (!arguments.length) return startRadius;
+    startRadius = _;
+    return link;
+  };
+
+  link.endRadius = function(_) {
+    if (!arguments.length) return endRadius;
+    endRadius = _;
+    return link;
+  };
+
+  return link;
+};