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visu_forest/supermap/libs/d3/d3-hexbin.v0.2.js

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+// https://github.com/d3/d3-hexbin Version 0.2.2. Copyright 2017 Mike Bostock.
+//license:BSD 3-clause "New" or "Revised"
+(function (global, factory) {
+	typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
+	typeof define === 'function' && define.amd ? define(['exports'], factory) :
+	(factory((global.d3 = global.d3 || {})));
+}(this, (function (exports) { 'use strict';
+
+var thirdPi = Math.PI / 3;
+var angles = [0, thirdPi, 2 * thirdPi, 3 * thirdPi, 4 * thirdPi, 5 * thirdPi];
+
+function pointX(d) {
+  return d[0];
+}
+
+function pointY(d) {
+  return d[1];
+}
+
+var hexbin = function() {
+  var x0 = 0,
+      y0 = 0,
+      x1 = 1,
+      y1 = 1,
+      x = pointX,
+      y = pointY,
+      r,
+      dx,
+      dy;
+
+  function hexbin(points) {
+    var binsById = {}, bins = [], i, n = points.length;
+
+    for (i = 0; i < n; ++i) {
+      if (isNaN(px = +x.call(null, point = points[i], i, points))
+          || isNaN(py = +y.call(null, point, i, points))) continue;
+
+      var point,
+          px,
+          py,
+          pj = Math.round(py = py / dy),
+          pi = Math.round(px = px / dx - (pj & 1) / 2),
+          py1 = py - pj;
+
+      if (Math.abs(py1) * 3 > 1) {
+        var px1 = px - pi,
+            pi2 = pi + (px < pi ? -1 : 1) / 2,
+            pj2 = pj + (py < pj ? -1 : 1),
+            px2 = px - pi2,
+            py2 = py - pj2;
+        if (px1 * px1 + py1 * py1 > px2 * px2 + py2 * py2) pi = pi2 + (pj & 1 ? 1 : -1) / 2, pj = pj2;
+      }
+
+      var id = pi + "-" + pj, bin = binsById[id];
+      if (bin) bin.push(point);
+      else {
+        bins.push(bin = binsById[id] = [point]);
+        bin.x = (pi + (pj & 1) / 2) * dx;
+        bin.y = pj * dy;
+      }
+    }
+
+    return bins;
+  }
+
+  function hexagon(radius) {
+    var x0 = 0, y0 = 0;
+    return angles.map(function(angle) {
+      var x1 = Math.sin(angle) * radius,
+          y1 = -Math.cos(angle) * radius,
+          dx = x1 - x0,
+          dy = y1 - y0;
+      x0 = x1, y0 = y1;
+      return [dx, dy];
+    });
+  }
+
+  hexbin.hexagon = function(radius) {
+    return "m" + hexagon(radius == null ? r : +radius).join("l") + "z";
+  };
+
+  hexbin.centers = function() {
+    var centers = [],
+        j = Math.round(y0 / dy),
+        i = Math.round(x0 / dx);
+    for (var y = j * dy; y < y1 + r; y += dy, ++j) {
+      for (var x = i * dx + (j & 1) * dx / 2; x < x1 + dx / 2; x += dx) {
+        centers.push([x, y]);
+      }
+    }
+    return centers;
+  };
+
+  hexbin.mesh = function() {
+    var fragment = hexagon(r).slice(0, 4).join("l");
+    return hexbin.centers().map(function(p) { return "M" + p + "m" + fragment; }).join("");
+  };
+
+  hexbin.x = function(_) {
+    return arguments.length ? (x = _, hexbin) : x;
+  };
+
+  hexbin.y = function(_) {
+    return arguments.length ? (y = _, hexbin) : y;
+  };
+
+  hexbin.radius = function(_) {
+    return arguments.length ? (r = +_, dx = r * 2 * Math.sin(thirdPi), dy = r * 1.5, hexbin) : r;
+  };
+
+  hexbin.size = function(_) {
+    return arguments.length ? (x0 = y0 = 0, x1 = +_[0], y1 = +_[1], hexbin) : [x1 - x0, y1 - y0];
+  };
+
+  hexbin.extent = function(_) {
+    return arguments.length ? (x0 = +_[0][0], y0 = +_[0][1], x1 = +_[1][0], y1 = +_[1][1], hexbin) : [[x0, y0], [x1, y1]];
+  };
+
+  return hexbin.radius(1);
+};
+
+exports.hexbin = hexbin;
+
+Object.defineProperty(exports, '__esModule', { value: true });
+
+})));