From f429ab1582d397a5c6bad45a6c5e4bde91882a07 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Philippe=20Rivi=C3=A8re?= <fil@rezo.net>
Date: Mon, 27 Jul 2020 12:18:27 +0200
Subject: [PATCH 1/5] prepare deps for d3v6

---
 package.json |  6 +++---
 yarn.lock    | 28 ++++++++++++++--------------
 2 files changed, 17 insertions(+), 17 deletions(-)

diff --git a/package.json b/package.json
index 08369af..062929b 100644
--- a/package.json
+++ b/package.json
@@ -37,9 +37,9 @@
     "dist/**/*.js"
   ],
   "dependencies": {
-    "d3-dispatch": "1",
-    "d3-quadtree": "1",
-    "d3-timer": "1"
+    "d3-dispatch": ">=2.0.0-rc.1",
+    "d3-quadtree": ">=2.0.0-rc.1",
+    "d3-timer": ">=2.0.0-rc.1"
   },
   "sideEffects": false,
   "devDependencies": {
diff --git a/yarn.lock b/yarn.lock
index 65f272d..26a8eeb 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -169,20 +169,20 @@ cross-spawn@^6.0.5:
     shebang-command "^1.2.0"
     which "^1.2.9"
 
-d3-dispatch@1:
-  version "1.0.5"
-  resolved "https://registry.yarnpkg.com/d3-dispatch/-/d3-dispatch-1.0.5.tgz#e25c10a186517cd6c82dd19ea018f07e01e39015"
-  integrity sha512-vwKx+lAqB1UuCeklr6Jh1bvC4SZgbSqbkGBLClItFBIYH4vqDJCA7qfoy14lXmJdnBOdxndAMxjCbImJYW7e6g==
-
-d3-quadtree@1:
-  version "1.0.6"
-  resolved "https://registry.yarnpkg.com/d3-quadtree/-/d3-quadtree-1.0.6.tgz#d1ab2a95a7f27bbde88582c94166f6ae35f32056"
-  integrity sha512-NUgeo9G+ENQCQ1LsRr2qJg3MQ4DJvxcDNCiohdJGHt5gRhBW6orIB5m5FJ9kK3HNL8g9F4ERVoBzcEwQBfXWVA==
-
-d3-timer@1:
-  version "1.0.9"
-  resolved "https://registry.yarnpkg.com/d3-timer/-/d3-timer-1.0.9.tgz#f7bb8c0d597d792ff7131e1c24a36dd471a471ba"
-  integrity sha512-rT34J5HnQUHhcLvhSB9GjCkN0Ddd5Y8nCwDBG2u6wQEeYxT/Lf51fTFFkldeib/sE/J0clIe0pnCfs6g/lRbyg==
+d3-dispatch@>=2.0.0-rc.1:
+  version "2.0.0-rc.1"
+  resolved "https://registry.yarnpkg.com/d3-dispatch/-/d3-dispatch-2.0.0-rc.1.tgz#cb7a29779b4dd4241ccef5b8a19f46a5e727f47b"
+  integrity sha512-JRzTbYPZ1GDu+eGZPOVyyhveu49PEL3msPVXBFEUDk0xCqhX7Eu2tCVcl+1gculBCkj6LEW2f725QmxWVsOPaA==
+
+d3-quadtree@>=2.0.0-rc.1:
+  version "2.0.0-rc.1"
+  resolved "https://registry.yarnpkg.com/d3-quadtree/-/d3-quadtree-2.0.0-rc.1.tgz#afc76b7ca3f63c3e0cb88fc246b30276beab0623"
+  integrity sha512-rt2PaorxXzxZYHw1nSM82nJjIj91VU3/r40LPNBGqIhRXlTuAlgspOH8/w85OOCqxSsV0c1qKwbzYIu/8bwD7A==
+
+d3-timer@>=2.0.0-rc.1:
+  version "2.0.0-rc.1"
+  resolved "https://registry.yarnpkg.com/d3-timer/-/d3-timer-2.0.0-rc.1.tgz#8afc777810198f28d9b2ac1ef8765b767ce4bc22"
+  integrity sha512-Kfi4LnjFC1t1MnnjCrHh3TyQIJr9/mMjmjeTFYwG364CtTKtv8snI/juT5zoiCCsMwrxdzwrM7Kmpj24p/AClw==
 
 debug@^4.0.1:
   version "4.1.1"

From f3bb4780797368c79e79b9cc2fb77b2cfadc3fef Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Philippe=20Rivi=C3=A8re?= <fil@rezo.net>
Date: Thu, 25 Jun 2020 17:14:07 +0200
Subject: [PATCH 2/5] deterministic prng fixes #121 thanks, @benstevens48!

---
 src/jiggle.js | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/jiggle.js b/src/jiggle.js
index de46cff..04231fe 100644
--- a/src/jiggle.js
+++ b/src/jiggle.js
@@ -1,3 +1,9 @@
-export default function() {
-  return (Math.random() - 0.5) * 1e-6;
+// https://en.wikipedia.org/wiki/Linear_congruential_generator#Parameters_in_common_use
+const a = 1664525,
+      c = 1013904223,
+      m = 4294967296;
+let s = 1;
+export default function(seed) {
+  if (seed) s = Math.abs(a * seed);
+  return ((s = (a * s + c) % m) / m - 0.5) * 1e-6;
 }

From 8f588179737ac62f68042a1ae89ddee3c0bba1ab Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Philippe=20Rivi=C3=A8re?= <fil@rezo.net>
Date: Tue, 28 Jul 2020 11:14:57 +0200
Subject: [PATCH 3/5] v2.1.0-rc.2

---
 package.json | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/package.json b/package.json
index 062929b..8f8a8e2 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,9 @@
 {
   "name": "d3-force",
-  "version": "2.0.1",
+  "version": "2.1.0-rc.2",
+  "publishConfig": {
+    "tag": "next"
+  },
   "description": "Force-directed graph layout using velocity Verlet integration.",
   "keywords": [
     "d3",

From 8ac135ee5adeebc6e4861e755805d0eb812e6101 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Philippe=20Rivi=C3=A8re?= <fil@rezo.net>
Date: Tue, 28 Jul 2020 11:24:45 +0200
Subject: [PATCH 4/5] links

---
 README.md | 108 +++++++++++++++++++++++++++---------------------------
 1 file changed, 54 insertions(+), 54 deletions(-)

diff --git a/README.md b/README.md
index bf24aef..667e5b5 100644
--- a/README.md
+++ b/README.md
@@ -2,17 +2,17 @@
 
 This module implements a [velocity Verlet](https://en.wikipedia.org/wiki/Verlet_integration) numerical integrator for simulating physical forces on particles. The simulation is simplified: it assumes a constant unit time step Δ*t* = 1 for each step, and a constant unit mass *m* = 1 for all particles. As a result, a force *F* acting on a particle is equivalent to a constant acceleration *a* over the time interval Δ*t*, and can be simulated simply by adding to the particle’s velocity, which is then added to the particle’s position.
 
-In the domain of information visualization, physical simulations are useful for studying [networks](http://bl.ocks.org/mbostock/ad70335eeef6d167bc36fd3c04378048) and [hierarchies](http://bl.ocks.org/mbostock/95aa92e2f4e8345aaa55a4a94d41ce37)!
+In the domain of information visualization, physical simulations are useful for studying [networks](https://bl.ocks.org/mbostock/ad70335eeef6d167bc36fd3c04378048) and [hierarchies](https://observablehq.com/@d3/force-directed-tree)!
 
-[<img alt="Force Dragging III" src="https://raw.githubusercontent.com/d3/d3-force/master/img/graph.png" width="420" height="219">](http://bl.ocks.org/mbostock/ad70335eeef6d167bc36fd3c04378048)[<img alt="Force-Directed Tree" src="https://raw.githubusercontent.com/d3/d3-force/master/img/tree.png" width="420" height="219">](http://bl.ocks.org/mbostock/95aa92e2f4e8345aaa55a4a94d41ce37)
+[<img alt="Force Dragging III" src="https://raw.githubusercontent.com/d3/d3-force/master/img/graph.png" width="420" height="219">](https://bl.ocks.org/mbostock/ad70335eeef6d167bc36fd3c04378048)[<img alt="Force-Directed Tree" src="https://raw.githubusercontent.com/d3/d3-force/master/img/tree.png" width="420" height="219">](https://observablehq.com/@d3/force-directed-tree)
 
-You can also simulate circles (disks) with collision, such as for [bubble charts](http://www.nytimes.com/interactive/2012/09/06/us/politics/convention-word-counts.html) or [beeswarm plots](http://bl.ocks.org/mbostock/6526445e2b44303eebf21da3b6627320):
+You can also simulate circles (disks) with collision, such as for [bubble charts](http://www.nytimes.com/interactive/2012/09/06/us/politics/convention-word-counts.html) or [beeswarm plots](https://observablehq.com/@d3/beeswarm):
 
-[<img alt="Collision Detection" src="https://raw.githubusercontent.com/d3/d3-force/master/img/collide.png" width="420" height="219">](http://bl.ocks.org/mbostock/31ce330646fa8bcb7289ff3b97aab3f5)[<img alt="Beeswarm" src="https://raw.githubusercontent.com/d3/d3-force/master/img/beeswarm.png" width="420" height="219">](http://bl.ocks.org/mbostock/6526445e2b44303eebf21da3b6627320)
+[<img alt="Collision Detection" src="https://raw.githubusercontent.com/d3/d3-force/master/img/collide.png" width="420" height="219">](https://bl.ocks.org/mbostock/31ce330646fa8bcb7289ff3b97aab3f5)[<img alt="Beeswarm" src="https://raw.githubusercontent.com/d3/d3-force/master/img/beeswarm.png" width="420" height="219">](https://observablehq.com/@d3/beeswarm)
 
 You can even use it as a rudimentary physics engine, say to simulate cloth:
 
-[<img alt="Force-Directed Lattice" src="https://raw.githubusercontent.com/d3/d3-force/master/img/lattice.png" width="480" height="250">](http://bl.ocks.org/mbostock/1b64ec067fcfc51e7471d944f51f1611)
+[<img alt="Force-Directed Lattice" src="https://raw.githubusercontent.com/d3/d3-force/master/img/lattice.png" width="480" height="250">](https://bl.ocks.org/mbostock/1b64ec067fcfc51e7471d944f51f1611)
 
 To use this module, create a [simulation](#simulation) for an array of [nodes](#simulation_nodes), and compose the desired [forces](#simulation_force). Then [listen](#simulation_on) for tick events to render the nodes as they update in your preferred graphics system, such as Canvas or SVG.
 
@@ -21,9 +21,9 @@ To use this module, create a [simulation](#simulation) for an array of [nodes](#
 If you use NPM, `npm install d3-force`. Otherwise, download the [latest release](https://github.com/d3/d3-force/releases/latest). You can also load directly from [d3js.org](https://d3js.org), either as a [standalone library](https://d3js.org/d3-force.v2.min.js) or as part of [D3](https://github.com/d3/d3). AMD, CommonJS, and vanilla environments are supported. In vanilla, a `d3_force` global is exported:
 
 ```html
-<script src="https://d3js.org/d3-dispatch.v1.min.js"></script>
-<script src="https://d3js.org/d3-quadtree.v1.min.js"></script>
-<script src="https://d3js.org/d3-timer.v1.min.js"></script>
+<script src="https://d3js.org/d3-dispatch.v2.min.js"></script>
+<script src="https://d3js.org/d3-quadtree.v2.min.js"></script>
+<script src="https://d3js.org/d3-timer.v2.min.js"></script>
 <script src="https://d3js.org/d3-force.v2.min.js"></script>
 <script>
 
@@ -38,19 +38,19 @@ var simulation = d3.forceSimulation(nodes);
 
 ### Simulation
 
-<a name="forceSimulation" href="#forceSimulation">#</a> d3.<b>forceSimulation</b>([<i>nodes</i>]) [<>](https://github.com/d3/d3-force/blob/master/src/simulation.js "Source")
+<a name="forceSimulation" href="#forceSimulation">#</a> d3.<b>forceSimulation</b>([<i>nodes</i>]) · [Source](https://github.com/d3/d3-force/blob/master/src/simulation.js)
 
 Creates a new simulation with the specified array of [*nodes*](#simulation_nodes) and no [forces](#simulation_force). If *nodes* is not specified, it defaults to the empty array. The simulator [starts](#simulation_restart) automatically; use [*simulation*.on](#simulation_on) to listen for tick events as the simulation runs. If you wish to run the simulation manually instead, call [*simulation*.stop](#simulation_stop), and then call [*simulation*.tick](#simulation_tick) as desired.
 
-<a name="simulation_restart" href="#simulation_restart">#</a> <i>simulation</i>.<b>restart</b>() [<>](https://github.com/d3/d3-force/blob/master/src/simulation.js#L86 "Source")
+<a name="simulation_restart" href="#simulation_restart">#</a> <i>simulation</i>.<b>restart</b>() · [Source](https://github.com/d3/d3-force/blob/master/src/simulation.js)
 
 Restarts the simulation’s internal timer and returns the simulation. In conjunction with [*simulation*.alphaTarget](#simulation_alphaTarget) or [*simulation*.alpha](#simulation_alpha), this method can be used to “reheat” the simulation during interaction, such as when dragging a node, or to resume the simulation after temporarily pausing it with [*simulation*.stop](#simulation_stop).
 
-<a name="simulation_stop" href="#simulation_stop">#</a> <i>simulation</i>.<b>stop</b>() [<>](https://github.com/d3/d3-force/blob/master/src/simulation.js#L90 "Source")
+<a name="simulation_stop" href="#simulation_stop">#</a> <i>simulation</i>.<b>stop</b>() · [Source](https://github.com/d3/d3-force/blob/master/src/simulation.js)
 
 Stops the simulation’s internal timer, if it is running, and returns the simulation. If the timer is already stopped, this method does nothing. This method is useful for running the simulation manually; see [*simulation*.tick](#simulation_tick).
 
-<a name="simulation_tick" href="#simulation_tick">#</a> <i>simulation</i>.<b>tick</b>([<i>iterations</i>]) [<>](https://github.com/d3/d3-force/blob/master/src/simulation.js#L38 "Source")
+<a name="simulation_tick" href="#simulation_tick">#</a> <i>simulation</i>.<b>tick</b>([<i>iterations</i>]) · [Source](https://github.com/d3/d3-force/blob/master/src/simulation.js)
 
 Manually steps the simulation by the specified number of *iterations*, and returns the simulation. If *iterations* is not specified, it defaults to 1 (single step).
 
@@ -60,7 +60,7 @@ This method does not dispatch [events](#simulation_on); events are only dispatch
 
 This method can be used in conjunction with [*simulation*.stop](#simulation_stop) to compute a [static force layout](https://bl.ocks.org/mbostock/1667139). For large graphs, static layouts should be computed [in a web worker](https://bl.ocks.org/mbostock/01ab2e85e8727d6529d20391c0fd9a16) to avoid freezing the user interface.
 
-<a name="simulation_nodes" href="#simulation_nodes">#</a> <i>simulation</i>.<b>nodes</b>([<i>nodes</i>]) [<>](https://github.com/d3/d3-force/blob/master/src/simulation.js#L94 "Source")
+<a name="simulation_nodes" href="#simulation_nodes">#</a> <i>simulation</i>.<b>nodes</b>([<i>nodes</i>]) · [Source](https://github.com/d3/d3-force/blob/master/src/simulation.js)
 
 If *nodes* is specified, sets the simulation’s nodes to the specified array of objects, initializing their positions and velocities if necessary, and then [re-initializes](#force_initialize) any bound [forces](#simulation_force); returns the simulation. If *nodes* is not specified, returns the simulation’s array of nodes as specified to the [constructor](#forceSimulation).
 
@@ -83,31 +83,31 @@ At the end of each [tick](#simulation_tick), after the application of any forces
 
 If the specified array of *nodes* is modified, such as when nodes are added to or removed from the simulation, this method must be called again with the new (or changed) array to notify the simulation and bound forces of the change; the simulation does not make a defensive copy of the specified array.
 
-<a name="simulation_alpha" href="#simulation_alpha">#</a> <i>simulation</i>.<b>alpha</b>([<i>alpha</i>]) [<>](https://github.com/d3/d3-force/blob/master/src/simulation.js#L98 "Source")
+<a name="simulation_alpha" href="#simulation_alpha">#</a> <i>simulation</i>.<b>alpha</b>([<i>alpha</i>]) · [Source](https://github.com/d3/d3-force/blob/master/src/simulation.js)
 
 *alpha* is roughly analogous to temperature in [simulated annealing](https://en.wikipedia.org/wiki/Simulated_annealing#Overview). It decreases over time as the simulation “cools down”. When *alpha* reaches *alphaMin*, the simulation stops; see [*simulation*.restart](#simulation_restart).
 
 If *alpha* is specified, sets the current alpha to the specified number in the range [0,1] and returns this simulation. If *alpha* is not specified, returns the current alpha value, which defaults to 1.
 
-<a name="simulation_alphaMin" href="#simulation_alphaMin">#</a> <i>simulation</i>.<b>alphaMin</b>([<i>min</i>]) [<>](https://github.com/d3/d3-force/blob/master/src/simulation.js#L102 "Source")
+<a name="simulation_alphaMin" href="#simulation_alphaMin">#</a> <i>simulation</i>.<b>alphaMin</b>([<i>min</i>]) · [Source](https://github.com/d3/d3-force/blob/master/src/simulation.js)
 
 If *min* is specified, sets the minimum *alpha* to the specified number in the range [0,1] and returns this simulation. If *min* is not specified, returns the current minimum *alpha* value, which defaults to 0.001. The simulation’s internal timer stops when the current [*alpha*](#simulation_alpha) is less than the minimum *alpha*. The default [alpha decay rate](#simulation_alphaDecay) of ~0.0228 corresponds to 300 iterations.
 
-<a name="simulation_alphaDecay" href="#simulation_alphaDecay">#</a> <i>simulation</i>.<b>alphaDecay</b>([<i>decay</i>]) [<>](https://github.com/d3/d3-force/blob/master/src/simulation.js#L106 "Source")
+<a name="simulation_alphaDecay" href="#simulation_alphaDecay">#</a> <i>simulation</i>.<b>alphaDecay</b>([<i>decay</i>]) · [Source](https://github.com/d3/d3-force/blob/master/src/simulation.js)
 
 If *decay* is specified, sets the [*alpha*](#simulation_alpha) decay rate to the specified number in the range [0,1] and returns this simulation. If *decay* is not specified, returns the current *alpha* decay rate, which defaults to 0.0228… = 1 - *pow*(0.001, 1 / 300) where 0.001 is the default [minimum *alpha*](#simulation_alphaMin).
 
 The alpha decay rate determines how quickly the current alpha interpolates towards the desired [target *alpha*](#simulation_alphaTarget); since the default target *alpha* is zero, by default this controls how quickly the simulation cools. Higher decay rates cause the simulation to stabilize more quickly, but risk getting stuck in a local minimum; lower values cause the simulation to take longer to run, but typically converge on a better layout. To have the simulation run forever at the current *alpha*, set the *decay* rate to zero; alternatively, set a [target *alpha*](#simulation_alphaTarget) greater than the [minimum *alpha*](#simulation_alphaMin).
 
-<a name="simulation_alphaTarget" href="#simulation_alphaTarget">#</a> <i>simulation</i>.<b>alphaTarget</b>([<i>target</i>]) [<>](https://github.com/d3/d3-force/blob/master/src/simulation.js#L110 "Source")
+<a name="simulation_alphaTarget" href="#simulation_alphaTarget">#</a> <i>simulation</i>.<b>alphaTarget</b>([<i>target</i>]) · [Source](https://github.com/d3/d3-force/blob/master/src/simulation.js)
 
 If *target* is specified, sets the current target [*alpha*](#simulation_alpha) to the specified number in the range [0,1] and returns this simulation. If *target* is not specified, returns the current target alpha value, which defaults to 0.
 
-<a name="simulation_velocityDecay" href="#simulation_velocityDecay">#</a> <i>simulation</i>.<b>velocityDecay</b>([<i>decay</i>]) [<>](https://github.com/d3/d3-force/blob/master/src/simulation.js#L114 "Source")
+<a name="simulation_velocityDecay" href="#simulation_velocityDecay">#</a> <i>simulation</i>.<b>velocityDecay</b>([<i>decay</i>]) · [Source](https://github.com/d3/d3-force/blob/master/src/simulation.js)
 
 If *decay* is specified, sets the velocity decay factor to the specified number in the range [0,1] and returns this simulation. If *decay* is not specified, returns the current velocity decay factor, which defaults to 0.4. The decay factor is akin to atmospheric friction; after the application of any forces during a [tick](#simulation_tick), each node’s velocity is multiplied by 1 - *decay*. As with lowering the [alpha decay rate](#simulation_alphaDecay), less velocity decay may converge on a better solution, but risks numerical instabilities and oscillation.
 
-<a name="simulation_force" href="#simulation_force">#</a> <i>simulation</i>.<b>force</b>(<i>name</i>[, <i>force</i>]) [<>](https://github.com/d3/d3-force/blob/master/src/simulation.js#L118 "Source")
+<a name="simulation_force" href="#simulation_force">#</a> <i>simulation</i>.<b>force</b>(<i>name</i>[, <i>force</i>]) · [Source](https://github.com/d3/d3-force/blob/master/src/simulation.js)
 
 If *force* is specified, assigns the [force](#forces) for the specified *name* and returns this simulation. If *force* is not specified, returns the force with the specified name, or undefined if there is no such force. (By default, new simulations have no forces.) For example, to create a new simulation to layout a graph, you might say:
 
@@ -124,11 +124,11 @@ To remove the force with the given *name*, pass null as the *force*. For example
 simulation.force("charge", null);
 ```
 
-<a name="simulation_find" href="#simulation_find">#</a> <i>simulation</i>.<b>find</b>(<i>x</i>, <i>y</i>[, <i>radius</i>]) [<>](https://github.com/d3/d3-force/blob/master/src/simulation.js#L122 "Source")
+<a name="simulation_find" href="#simulation_find">#</a> <i>simulation</i>.<b>find</b>(<i>x</i>, <i>y</i>[, <i>radius</i>]) · [Source](https://github.com/d3/d3-force/blob/master/src/simulation.js)
 
 Returns the node closest to the position ⟨*x*,*y*⟩ with the given search *radius*. If *radius* is not specified, it defaults to infinity. If there is no node within the search area, returns undefined.
 
-<a name="simulation_on" href="#simulation_on">#</a> <i>simulation</i>.<b>on</b>(<i>typenames</i>, [<i>listener</i>]) [<>](https://github.com/d3/d3-force/blob/master/src/simulation.js#L145 "Source")
+<a name="simulation_on" href="#simulation_on">#</a> <i>simulation</i>.<b>on</b>(<i>typenames</i>, [<i>listener</i>]) · [Source](https://github.com/d3/d3-force/blob/master/src/simulation.js)
 
 If *listener* is specified, sets the event *listener* for the specified *typenames* and returns this simulation. If an event listener was already registered for the same type and name, the existing listener is removed before the new listener is added. If *listener* is null, removes the current event listeners for the specified *typenames*, if any. If *listener* is not specified, returns the first currently-assigned listener matching the specified *typenames*, if any. When a specified event is dispatched, each *listener* will be invoked with the `this` context as the simulation.
 
@@ -167,11 +167,11 @@ Simulations typically compose multiple forces as desired. This module provides s
 
 Forces may optionally implement [*force*.initialize](#force_initialize) to receive the simulation’s array of nodes.
 
-<a name="_force" href="#_force">#</a> <i>force</i>(<i>alpha</i>) [<>](https://github.com/d3/d3-force/blob/master/src/simulation.js#L47 "Source")
+<a name="_force" href="#_force">#</a> <i>force</i>(<i>alpha</i>) · [Source](https://github.com/d3/d3-force/blob/master/src/simulation.js)
 
 Applies this force, optionally observing the specified *alpha*. Typically, the force is applied to the array of nodes previously passed to [*force*.initialize](#force_initialize), however, some forces may apply to a subset of nodes, or behave differently. For example, [d3.forceLink](#links) applies to the source and target of each link.
 
-<a name="force_initialize" href="#force_initialize">#</a> <i>force</i>.<b>initialize</b>(<i>nodes</i>) [<>](https://github.com/d3/d3-force/blob/master/src/simulation.js#L77 "Source")
+<a name="force_initialize" href="#force_initialize">#</a> <i>force</i>.<b>initialize</b>(<i>nodes</i>) · [Source](https://github.com/d3/d3-force/blob/master/src/simulation.js)
 
 Assigns the array of *nodes* to this force. This method is called when a force is bound to a simulation via [*simulation*.force](#simulation_force) and when the simulation’s nodes change via [*simulation*.nodes](#simulation_nodes). A force may perform necessary work during initialization, such as evaluating per-node parameters, to avoid repeatedly performing work during each application of the force.
 
@@ -179,15 +179,15 @@ Assigns the array of *nodes* to this force. This method is called when a force i
 
 The centering force translates nodes uniformly so that the mean position of all nodes (the center of mass if all nodes have equal weight) is at the given position ⟨[*x*](#center_x),[*y*](#center_y)⟩. This force modifies the positions of nodes on each application; it does not modify velocities, as doing so would typically cause the nodes to overshoot and oscillate around the desired center. This force helps keeps nodes in the center of the viewport, and unlike the [positioning force](#positioning), it does not distort their relative positions.
 
-<a name="forceCenter" href="#forceCenter">#</a> d3.<b>forceCenter</b>([<i>x</i>, <i>y</i>]) [<>](https://github.com/d3/d3-force/blob/master/src/center.js#L1 "Source")
+<a name="forceCenter" href="#forceCenter">#</a> d3.<b>forceCenter</b>([<i>x</i>, <i>y</i>]) · [Source](https://github.com/d3/d3-force/blob/master/src/center.js)
 
 Creates a new centering force with the specified [*x*-](#center_x) and [*y*-](#center_y) coordinates. If *x* and *y* are not specified, they default to ⟨0,0⟩.
 
-<a name="center_x" href="#center_x">#</a> <i>center</i>.<b>x</b>([<i>x</i>]) [<>](https://github.com/d3/d3-force/blob/master/src/center.js#L27 "Source")
+<a name="center_x" href="#center_x">#</a> <i>center</i>.<b>x</b>([<i>x</i>]) · [Source](https://github.com/d3/d3-force/blob/master/src/center.js)
 
 If *x* is specified, sets the *x*-coordinate of the centering position to the specified number and returns this force. If *x* is not specified, returns the current *x*-coordinate, which defaults to zero.
 
-<a name="center_y" href="#center_y">#</a> <i>center</i>.<b>y</b>([<i>y</i>]) [<>](https://github.com/d3/d3-force/blob/master/src/center.js#L31 "Source")
+<a name="center_y" href="#center_y">#</a> <i>center</i>.<b>y</b>([<i>y</i>]) · [Source](https://github.com/d3/d3-force/blob/master/src/center.js)
 
 If *y* is specified, sets the *y*-coordinate of the centering position to the specified number and returns this force. If *y* is not specified, returns the current *y*-coordinate, which defaults to zero.
 
@@ -195,11 +195,11 @@ If *y* is specified, sets the *y*-coordinate of the centering position to the sp
 
 The collision force treats nodes as circles with a given [radius](#collide_radius), rather than points, and prevents nodes from overlapping. More formally, two nodes *a* and *b* are separated so that the distance between *a* and *b* is at least *radius*(*a*) + *radius*(*b*). To reduce jitter, this is by default a “soft” constraint with a configurable [strength](#collide_strength) and [iteration count](#collide_iterations).
 
-<a name="forceCollide" href="#forceCollide">#</a> d3.<b>forceCollide</b>([<i>radius</i>]) [<>](https://github.com/d3/d3-force/blob/master/src/collide.js "Source")
+<a name="forceCollide" href="#forceCollide">#</a> d3.<b>forceCollide</b>([<i>radius</i>]) · [Source](https://github.com/d3/d3-force/blob/master/src/collide.js)
 
 Creates a new circle collision force with the specified [*radius*](#collide_radius). If *radius* is not specified, it defaults to the constant one for all nodes.
 
-<a name="collide_radius" href="#collide_radius">#</a> <i>collide</i>.<b>radius</b>([<i>radius</i>]) [<>](https://github.com/d3/d3-force/blob/master/src/collide.js#L86 "Source")
+<a name="collide_radius" href="#collide_radius">#</a> <i>collide</i>.<b>radius</b>([<i>radius</i>]) · [Source](https://github.com/d3/d3-force/blob/master/src/collide.js)
 
 If *radius* is specified, sets the radius accessor to the specified number or function, re-evaluates the radius accessor for each node, and returns this force. If *radius* is not specified, returns the current radius accessor, which defaults to:
 
@@ -211,13 +211,13 @@ function radius() {
 
 The radius accessor is invoked for each [node](#simulation_nodes) in the simulation, being passed the *node* and its zero-based *index*. The resulting number is then stored internally, such that the radius of each node is only recomputed when the force is initialized or when this method is called with a new *radius*, and not on every application of the force.
 
-<a name="collide_strength" href="#collide_strength">#</a> <i>collide</i>.<b>strength</b>([<i>strength</i>]) [<>](https://github.com/d3/d3-force/blob/master/src/collide.js#L82 "Source")
+<a name="collide_strength" href="#collide_strength">#</a> <i>collide</i>.<b>strength</b>([<i>strength</i>]) · [Source](https://github.com/d3/d3-force/blob/master/src/collide.js)
 
 If *strength* is specified, sets the force strength to the specified number in the range [0,1] and returns this force. If *strength* is not specified, returns the current strength which defaults to 1.
 
 Overlapping nodes are resolved through iterative relaxation. For each node, the other nodes that are anticipated to overlap at the next tick (using the anticipated positions ⟨*x* + *vx*,*y* + *vy*⟩) are determined; the node’s velocity is then modified to push the node out of each overlapping node. The change in velocity is dampened by the force’s strength such that the resolution of simultaneous overlaps can be blended together to find a stable solution.
 
-<a name="collide_iterations" href="#collide_iterations">#</a> <i>collide</i>.<b>iterations</b>([<i>iterations</i>]) [<>](https://github.com/d3/d3-force/blob/master/src/collide.js#L78 "Source")
+<a name="collide_iterations" href="#collide_iterations">#</a> <i>collide</i>.<b>iterations</b>([<i>iterations</i>]) · [Source](https://github.com/d3/d3-force/blob/master/src/collide.js)
 
 If *iterations* is specified, sets the number of iterations per application to the specified number and returns this force. If *iterations* is not specified, returns the current iteration count which defaults to 1. Increasing the number of iterations greatly increases the rigidity of the constraint and avoids partial overlap of nodes, but also increases the runtime cost to evaluate the force.
 
@@ -225,11 +225,11 @@ If *iterations* is specified, sets the number of iterations per application to t
 
 The link force pushes linked nodes together or apart according to the desired [link distance](#link_distance). The strength of the force is proportional to the difference between the linked nodes’ distance and the target distance, similar to a spring force.
 
-<a name="forceLink" href="#forceLink">#</a> d3.<b>forceLink</b>([<i>links</i>]) [<>](https://github.com/d3/d3-force/blob/master/src/link.js "Source")
+<a name="forceLink" href="#forceLink">#</a> d3.<b>forceLink</b>([<i>links</i>]) · [Source](https://github.com/d3/d3-force/blob/master/src/link.js)
 
 Creates a new link force with the specified *links* and default parameters. If *links* is not specified, it defaults to the empty array.
 
-<a name="link_links" href="#link_links">#</a> <i>link</i>.<b>links</b>([<i>links</i>]) [<>](https://github.com/d3/d3-force/blob/master/src/link.js#L92 "Source")
+<a name="link_links" href="#link_links">#</a> <i>link</i>.<b>links</b>([<i>links</i>]) · [Source](https://github.com/d3/d3-force/blob/master/src/link.js)
 
 If *links* is specified, sets the array of links associated with this force, recomputes the [distance](#link_distance) and [strength](#link_strength) parameters for each link, and returns this force. If *links* is not specified, returns the current array of links, which defaults to the empty array.
 
@@ -243,7 +243,7 @@ For convenience, a link’s source and target properties may be initialized usin
 
 If the specified array of *links* is modified, such as when links are added to or removed from the simulation, this method must be called again with the new (or changed) array to notify the force of the change; the force does not make a defensive copy of the specified array.
 
-<a name="link_id" href="#link_id">#</a> <i>link</i>.<b>id</b>([<i>id</i>]) [<>](https://github.com/d3/d3-force/blob/master/src/link.js#L96 "Source")
+<a name="link_id" href="#link_id">#</a> <i>link</i>.<b>id</b>([<i>id</i>]) · [Source](https://github.com/d3/d3-force/blob/master/src/link.js)
 
 If *id* is specified, sets the node id accessor to the specified function and returns this force. If *id* is not specified, returns the current node id accessor, which defaults to the numeric *node*.index:
 
@@ -291,11 +291,11 @@ var links = [
 ];
 ```
 
-This is particularly useful when representing graphs in JSON, as JSON does not allow references. See [this example](http://bl.ocks.org/mbostock/f584aa36df54c451c94a9d0798caed35).
+This is particularly useful when representing graphs in JSON, as JSON does not allow references. See [this example](https://bl.ocks.org/mbostock/f584aa36df54c451c94a9d0798caed35).
 
 The id accessor is invoked for each node whenever the force is initialized, as when the [nodes](#simulation_nodes) or [links](#link_links) change, being passed the node and its zero-based index.
 
-<a name="link_distance" href="#link_distance">#</a> <i>link</i>.<b>distance</b>([<i>distance</i>]) [<>](https://github.com/d3/d3-force/blob/master/src/link.js#L108 "Source")
+<a name="link_distance" href="#link_distance">#</a> <i>link</i>.<b>distance</b>([<i>distance</i>]) · [Source](https://github.com/d3/d3-force/blob/master/src/link.js)
 
 If *distance* is specified, sets the distance accessor to the specified number or function, re-evaluates the distance accessor for each link, and returns this force. If *distance* is not specified, returns the current distance accessor, which defaults to:
 
@@ -307,7 +307,7 @@ function distance() {
 
 The distance accessor is invoked for each [link](#link_links), being passed the *link* and its zero-based *index*. The resulting number is then stored internally, such that the distance of each link is only recomputed when the force is initialized or when this method is called with a new *distance*, and not on every application of the force.
 
-<a name="link_strength" href="#link_strength">#</a> <i>link</i>.<b>strength</b>([<i>strength</i>]) [<>](https://github.com/d3/d3-force/blob/master/src/link.js#L104 "Source")
+<a name="link_strength" href="#link_strength">#</a> <i>link</i>.<b>strength</b>([<i>strength</i>]) · [Source](https://github.com/d3/d3-force/blob/master/src/link.js)
 
 If *strength* is specified, sets the strength accessor to the specified number or function, re-evaluates the strength accessor for each link, and returns this force. If *strength* is not specified, returns the current strength accessor, which defaults to:
 
@@ -321,9 +321,9 @@ Where *count*(*node*) is a function that returns the number of links with the gi
 
 The strength accessor is invoked for each [link](#link_links), being passed the *link* and its zero-based *index*. The resulting number is then stored internally, such that the strength of each link is only recomputed when the force is initialized or when this method is called with a new *strength*, and not on every application of the force.
 
-<a name="link_iterations" href="#link_iterations">#</a> <i>link</i>.<b>iterations</b>([<i>iterations</i>]) [<>](https://github.com/d3/d3-force/blob/master/src/link.js#L100 "Source")
+<a name="link_iterations" href="#link_iterations">#</a> <i>link</i>.<b>iterations</b>([<i>iterations</i>]) · [Source](https://github.com/d3/d3-force/blob/master/src/link.js)
 
-If *iterations* is specified, sets the number of iterations per application to the specified number and returns this force. If *iterations* is not specified, returns the current iteration count which defaults to 1. Increasing the number of iterations greatly increases the rigidity of the constraint and is useful for [complex structures such as lattices](http://bl.ocks.org/mbostock/1b64ec067fcfc51e7471d944f51f1611), but also increases the runtime cost to evaluate the force.
+If *iterations* is specified, sets the number of iterations per application to the specified number and returns this force. If *iterations* is not specified, returns the current iteration count which defaults to 1. Increasing the number of iterations greatly increases the rigidity of the constraint and is useful for [complex structures such as lattices](https://bl.ocks.org/mbostock/1b64ec067fcfc51e7471d944f51f1611), but also increases the runtime cost to evaluate the force.
 
 #### Many-Body
 
@@ -331,11 +331,11 @@ The many-body (or *n*-body) force applies mutually amongst all [nodes](#simulati
 
 Unlike links, which only affect two linked nodes, the charge force is global: every node affects every other node, even if they are on disconnected subgraphs.
 
-<a name="forceManyBody" href="#forceManyBody">#</a> d3.<b>forceManyBody</b>() [<>](https://github.com/d3/d3-force/blob/master/src/manyBody.js "Source")
+<a name="forceManyBody" href="#forceManyBody">#</a> d3.<b>forceManyBody</b>() · [Source](https://github.com/d3/d3-force/blob/master/src/manyBody.js)
 
 Creates a new many-body force with the default parameters.
 
-<a name="manyBody_strength" href="#manyBody_strength">#</a> <i>manyBody</i>.<b>strength</b>([<i>strength</i>]) [<>](https://github.com/d3/d3-force/blob/master/src/manyBody.js#L97 "Source")
+<a name="manyBody_strength" href="#manyBody_strength">#</a> <i>manyBody</i>.<b>strength</b>([<i>strength</i>]) · [Source](https://github.com/d3/d3-force/blob/master/src/manyBody.js)
 
 If *strength* is specified, sets the strength accessor to the specified number or function, re-evaluates the strength accessor for each node, and returns this force. A positive value causes nodes to attract each other, similar to gravity, while a negative value causes nodes to repel each other, similar to electrostatic charge. If *strength* is not specified, returns the current strength accessor, which defaults to:
 
@@ -347,17 +347,17 @@ function strength() {
 
 The strength accessor is invoked for each [node](#simulation_nodes) in the simulation, being passed the *node* and its zero-based *index*. The resulting number is then stored internally, such that the strength of each node is only recomputed when the force is initialized or when this method is called with a new *strength*, and not on every application of the force.
 
-<a name="manyBody_theta" href="#manyBody_theta">#</a> <i>manyBody</i>.<b>theta</b>([<i>theta</i>]) [<>](https://github.com/d3/d3-force/blob/master/src/manyBody.js#L109 "Source")
+<a name="manyBody_theta" href="#manyBody_theta">#</a> <i>manyBody</i>.<b>theta</b>([<i>theta</i>]) · [Source](https://github.com/d3/d3-force/blob/master/src/manyBody.js)
 
 If *theta* is specified, sets the Barnes–Hut approximation criterion to the specified number and returns this force. If *theta* is not specified, returns the current value, which defaults to 0.9.
 
 To accelerate computation, this force implements the [Barnes–Hut approximation](http://en.wikipedia.org/wiki/Barnes–Hut_simulation) which takes O(*n* log *n*) per application where *n* is the number of [nodes](#simulation_nodes). For each application, a [quadtree](https://github.com/d3/d3-quadtree) stores the current node positions; then for each node, the combined force of all other nodes on the given node is computed. For a cluster of nodes that is far away, the charge force can be approximated by treating the cluster as a single, larger node. The *theta* parameter determines the accuracy of the approximation: if the ratio *w* / *l* of the width *w* of the quadtree cell to the distance *l* from the node to the cell’s center of mass is less than *theta*, all nodes in the given cell are treated as a single node rather than individually.
 
-<a name="manyBody_distanceMin" href="#manyBody_distanceMin">#</a> <i>manyBody</i>.<b>distanceMin</b>([<i>distance</i>]) [<>](https://github.com/d3/d3-force/blob/master/src/manyBody.js#L101 "Source")
+<a name="manyBody_distanceMin" href="#manyBody_distanceMin">#</a> <i>manyBody</i>.<b>distanceMin</b>([<i>distance</i>]) · [Source](https://github.com/d3/d3-force/blob/master/src/manyBody.js)
 
 If *distance* is specified, sets the minimum distance between nodes over which this force is considered. If *distance* is not specified, returns the current minimum distance, which defaults to 1. A minimum distance establishes an upper bound on the strength of the force between two nearby nodes, avoiding instability. In particular, it avoids an infinitely-strong force if two nodes are exactly coincident; in this case, the direction of the force is random.
 
-<a name="manyBody_distanceMax" href="#manyBody_distanceMax">#</a> <i>manyBody</i>.<b>distanceMax</b>([<i>distance</i>]) [<>](https://github.com/d3/d3-force/blob/master/src/manyBody.js#L105 "Source")
+<a name="manyBody_distanceMax" href="#manyBody_distanceMax">#</a> <i>manyBody</i>.<b>distanceMax</b>([<i>distance</i>]) · [Source](https://github.com/d3/d3-force/blob/master/src/manyBody.js)
 
 If *distance* is specified, sets the maximum distance between nodes over which this force is considered. If *distance* is not specified, returns the current maximum distance, which defaults to infinity. Specifying a finite maximum distance improves performance and produces a more localized layout.
 
@@ -365,11 +365,11 @@ If *distance* is specified, sets the maximum distance between nodes over which t
 
 The [*x*](#forceX)- and [*y*](#forceY)-positioning forces push nodes towards a desired position along the given dimension with a configurable strength. The [*radial*](#forceRadial) force is similar, except it pushes nodes towards the closest point on a given circle. The strength of the force is proportional to the one-dimensional distance between the node’s position and the target position. While these forces can be used to position individual nodes, they are intended primarily for global forces that apply to all (or most) nodes.
 
-<a name="forceX" href="#forceX">#</a> d3.<b>forceX</b>([<i>x</i>]) [<>](https://github.com/d3/d3-force/blob/master/src/x.js "Source")
+<a name="forceX" href="#forceX">#</a> d3.<b>forceX</b>([<i>x</i>]) · [Source](https://github.com/d3/d3-force/blob/master/src/x.js)
 
 Creates a new positioning force along the *x*-axis towards the given position [*x*](#x_x). If *x* is not specified, it defaults to 0.
 
-<a name="x_strength" href="#x_strength">#</a> <i>x</i>.<b>strength</b>([<i>strength</i>]) [<>](https://github.com/d3/d3-force/blob/master/src/x.js#L32 "Source")
+<a name="x_strength" href="#x_strength">#</a> <i>x</i>.<b>strength</b>([<i>strength</i>]) · [Source](https://github.com/d3/d3-force/blob/master/src/x.js)
 
 If *strength* is specified, sets the strength accessor to the specified number or function, re-evaluates the strength accessor for each node, and returns this force. The *strength* determines how much to increment the node’s *x*-velocity: ([*x*](#x_x) - *node*.x) × *strength*. For example, a value of 0.1 indicates that the node should move a tenth of the way from its current *x*-position to the target *x*-position with each application. Higher values moves nodes more quickly to the target position, often at the expense of other forces or constraints. A value outside the range [0,1] is not recommended.
 
@@ -383,7 +383,7 @@ function strength() {
 
 The strength accessor is invoked for each [node](#simulation_nodes) in the simulation, being passed the *node* and its zero-based *index*. The resulting number is then stored internally, such that the strength of each node is only recomputed when the force is initialized or when this method is called with a new *strength*, and not on every application of the force.
 
-<a name="x_x" href="#x_x">#</a> <i>x</i>.<b>x</b>([<i>x</i>]) [<>](https://github.com/d3/d3-force/blob/master/src/x.js#L36 "Source")
+<a name="x_x" href="#x_x">#</a> <i>x</i>.<b>x</b>([<i>x</i>]) · [Source](https://github.com/d3/d3-force/blob/master/src/x.js)
 
 If *x* is specified, sets the *x*-coordinate accessor to the specified number or function, re-evaluates the *x*-accessor for each node, and returns this force. If *x* is not specified, returns the current *x*-accessor, which defaults to:
 
@@ -395,11 +395,11 @@ function x() {
 
 The *x*-accessor is invoked for each [node](#simulation_nodes) in the simulation, being passed the *node* and its zero-based *index*. The resulting number is then stored internally, such that the target *x*-coordinate of each node is only recomputed when the force is initialized or when this method is called with a new *x*, and not on every application of the force.
 
-<a name="forceY" href="#forceY">#</a> d3.<b>forceY</b>([<i>y</i>]) [<>](https://github.com/d3/d3-force/blob/master/src/y.js "Source")
+<a name="forceY" href="#forceY">#</a> d3.<b>forceY</b>([<i>y</i>]) · [Source](https://github.com/d3/d3-force/blob/master/src/y.js)
 
 Creates a new positioning force along the *y*-axis towards the given position [*y*](#y_y). If *y* is not specified, it defaults to 0.
 
-<a name="y_strength" href="#y_strength">#</a> <i>y</i>.<b>strength</b>([<i>strength</i>]) [<>](https://github.com/d3/d3-force/blob/master/src/y.js#L32 "Source")
+<a name="y_strength" href="#y_strength">#</a> <i>y</i>.<b>strength</b>([<i>strength</i>]) · [Source](https://github.com/d3/d3-force/blob/master/src/y.js)
 
 If *strength* is specified, sets the strength accessor to the specified number or function, re-evaluates the strength accessor for each node, and returns this force. The *strength* determines how much to increment the node’s *y*-velocity: ([*y*](#y_y) - *node*.y) × *strength*. For example, a value of 0.1 indicates that the node should move a tenth of the way from its current *y*-position to the target *y*-position with each application. Higher values moves nodes more quickly to the target position, often at the expense of other forces or constraints. A value outside the range [0,1] is not recommended.
 
@@ -413,7 +413,7 @@ function strength() {
 
 The strength accessor is invoked for each [node](#simulation_nodes) in the simulation, being passed the *node* and its zero-based *index*. The resulting number is then stored internally, such that the strength of each node is only recomputed when the force is initialized or when this method is called with a new *strength*, and not on every application of the force.
 
-<a name="y_y" href="#y_y">#</a> <i>y</i>.<b>y</b>([<i>y</i>]) [<>](https://github.com/d3/d3-force/blob/master/src/y.js#L36 "Source")
+<a name="y_y" href="#y_y">#</a> <i>y</i>.<b>y</b>([<i>y</i>]) · [Source](https://github.com/d3/d3-force/blob/master/src/y.js)
 
 If *y* is specified, sets the *y*-coordinate accessor to the specified number or function, re-evaluates the *y*-accessor for each node, and returns this force. If *y* is not specified, returns the current *y*-accessor, which defaults to:
 
@@ -425,13 +425,13 @@ function y() {
 
 The *y*-accessor is invoked for each [node](#simulation_nodes) in the simulation, being passed the *node* and its zero-based *index*. The resulting number is then stored internally, such that the target *y*-coordinate of each node is only recomputed when the force is initialized or when this method is called with a new *y*, and not on every application of the force.
 
-<a name="forceRadial" href="#forceRadial">#</a> d3.<b>forceRadial</b>(<i>radius</i>[, <i>x</i>][, <i>y</i>]) [<>](https://github.com/d3/d3-force/blob/master/src/radial.js "Source")
+<a name="forceRadial" href="#forceRadial">#</a> d3.<b>forceRadial</b>(<i>radius</i>[, <i>x</i>][, <i>y</i>]) · [Source](https://github.com/d3/d3-force/blob/master/src/radial.js)
 
 [<img alt="Radial Force" src="https://raw.githubusercontent.com/d3/d3-force/master/img/radial.png" width="420" height="219">](https://bl.ocks.org/mbostock/cd98bf52e9067e26945edd95e8cf6ef9)
 
 Creates a new positioning force towards a circle of the specified [*radius*](#radial_radius) centered at ⟨[*x*](#radial_x),[*y*](#radial_y)⟩. If *x* and *y* are not specified, they default to ⟨0,0⟩.
 
-<a name="radial_strength" href="#radial_strength">#</a> <i>radial</i>.<b>strength</b>([<i>strength</i>]) [<>](https://github.com/d3/d3-force/blob/master/src/radial.js "Source")
+<a name="radial_strength" href="#radial_strength">#</a> <i>radial</i>.<b>strength</b>([<i>strength</i>]) · [Source](https://github.com/d3/d3-force/blob/master/src/radial.js)
 
 If *strength* is specified, sets the strength accessor to the specified number or function, re-evaluates the strength accessor for each node, and returns this force. The *strength* determines how much to increment the node’s *x*- and *y*-velocity. For example, a value of 0.1 indicates that the node should move a tenth of the way from its current position to the closest point on the circle with each application. Higher values moves nodes more quickly to the target position, often at the expense of other forces or constraints. A value outside the range [0,1] is not recommended.
 
@@ -445,16 +445,16 @@ function strength() {
 
 The strength accessor is invoked for each [node](#simulation_nodes) in the simulation, being passed the *node* and its zero-based *index*. The resulting number is then stored internally, such that the strength of each node is only recomputed when the force is initialized or when this method is called with a new *strength*, and not on every application of the force.
 
-<a name="radial_radius" href="#radial_radius">#</a> <i>radial</i>.<b>radius</b>([<i>radius</i>]) [<>](https://github.com/d3/d3-force/blob/master/src/radial.js "Source")
+<a name="radial_radius" href="#radial_radius">#</a> <i>radial</i>.<b>radius</b>([<i>radius</i>]) · [Source](https://github.com/d3/d3-force/blob/master/src/radial.js)
 
 If *radius* is specified, sets the circle *radius* to the specified number or function, re-evaluates the *radius* accessor for each node, and returns this force. If *radius* is not specified, returns the current *radius* accessor.
 
 The *radius* accessor is invoked for each [node](#simulation_nodes) in the simulation, being passed the *node* and its zero-based *index*. The resulting number is then stored internally, such that the target radius of each node is only recomputed when the force is initialized or when this method is called with a new *radius*, and not on every application of the force.
 
-<a name="radial_x" href="#radial_x">#</a> <i>radial</i>.<b>x</b>([<i>x</i>]) [<>](https://github.com/d3/d3-force/blob/master/src/radial.js "Source")
+<a name="radial_x" href="#radial_x">#</a> <i>radial</i>.<b>x</b>([<i>x</i>]) · [Source](https://github.com/d3/d3-force/blob/master/src/radial.js)
 
 If *x* is specified, sets the *x*-coordinate of the circle center to the specified number and returns this force. If *x* is not specified, returns the current *x*-coordinate of the center, which defaults to zero.
 
-<a name="radial_y" href="#radial_y">#</a> <i>radial</i>.<b>y</b>([<i>y</i>]) [<>](https://github.com/d3/d3-force/blob/master/src/radial.js "Source")
+<a name="radial_y" href="#radial_y">#</a> <i>radial</i>.<b>y</b>([<i>y</i>]) · [Source](https://github.com/d3/d3-force/blob/master/src/radial.js)
 
 If *y* is specified, sets the *y*-coordinate of the circle center to the specified number and returns this force. If *y* is not specified, returns the current *y*-coordinate of the center, which defaults to zero.

From ff5b244a6fa0dba6bc3b1b981b820323899c6521 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Philippe=20Rivi=C3=A8re?= <fil@rezo.net>
Date: Tue, 28 Jul 2020 22:13:02 +0200
Subject: [PATCH 5/5] link

---
 README.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index 667e5b5..616bca5 100644
--- a/README.md
+++ b/README.md
@@ -2,9 +2,9 @@
 
 This module implements a [velocity Verlet](https://en.wikipedia.org/wiki/Verlet_integration) numerical integrator for simulating physical forces on particles. The simulation is simplified: it assumes a constant unit time step Δ*t* = 1 for each step, and a constant unit mass *m* = 1 for all particles. As a result, a force *F* acting on a particle is equivalent to a constant acceleration *a* over the time interval Δ*t*, and can be simulated simply by adding to the particle’s velocity, which is then added to the particle’s position.
 
-In the domain of information visualization, physical simulations are useful for studying [networks](https://bl.ocks.org/mbostock/ad70335eeef6d167bc36fd3c04378048) and [hierarchies](https://observablehq.com/@d3/force-directed-tree)!
+In the domain of information visualization, physical simulations are useful for studying [networks](https://observablehq.com/@d3/force-directed-graph) and [hierarchies](https://observablehq.com/@d3/force-directed-tree)!
 
-[<img alt="Force Dragging III" src="https://raw.githubusercontent.com/d3/d3-force/master/img/graph.png" width="420" height="219">](https://bl.ocks.org/mbostock/ad70335eeef6d167bc36fd3c04378048)[<img alt="Force-Directed Tree" src="https://raw.githubusercontent.com/d3/d3-force/master/img/tree.png" width="420" height="219">](https://observablehq.com/@d3/force-directed-tree)
+[<img alt="Force-Directed Graph" src="https://raw.githubusercontent.com/d3/d3-force/master/img/graph.png" width="420" height="219">](https://observablehq.com/@d3/force-directed-graph)[<img alt="Force-Directed Tree" src="https://raw.githubusercontent.com/d3/d3-force/master/img/tree.png" width="420" height="219">](https://observablehq.com/@d3/force-directed-tree)
 
 You can also simulate circles (disks) with collision, such as for [bubble charts](http://www.nytimes.com/interactive/2012/09/06/us/politics/convention-word-counts.html) or [beeswarm plots](https://observablehq.com/@d3/beeswarm):