r3f-forcegraph

React-Three-Fiber Force-Directed Graph
======================================

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React-Three-Fiber bindings for the three-forcegraph ThreeJS component.

#### Check out the examples:
* Basic (source)
* Larger Graph (source)
* Directional arrows (source)
* Directional moving particles (source)
* Text as nodes (source)
* Highlight nodes/links (source)
* Click to expand/collapse nodes (source)
* Node collision detection (source)
* Force-directed tree (DAG mode) (source)

❤️ Support This Project

If you find this module useful and would like to support its development, you can buy me a ☕. Your contributions help keep open-source sustainable!

Quick start

``js
import R3fForceGraph from 'r3f-forcegraph';
`
or using a script tag
`html

`
then
`jsx
useFrame(() => fgRef.current.tickFrame());

...


ref={fgRef}
graphData={myData}
/>

`

API reference

$3

| Prop | Type | Default | Description |
| --- | :--: | :--: | --- |
| graphData | object | { nodes: [], links: [] } | Graph data structure (see below for syntax details). Can also be used to apply incremental updates. |
| nodeId | string | id | Node object accessor attribute for unique node id (used in link objects source/target). |
| linkSource | string | source | Link object accessor attribute referring to id of source node. |
| linkTarget | string | target | Link object accessor attribute referring to id of target node. |

$3

| Prop | Type | Default | Description |
| --- | :--: | :--: | --- |
| nodeRelSize | number | 4 | Ratio of sphere volume (cubic px) per value unit. |
| nodeVal | number, string or func | val | Node object accessor function, attribute or a numeric constant for the node numeric value (affects node size). |
| nodeVisibility| bool, string or func | true | Node object accessor function, attribute or a boolean constant for whether to display the node. |
| nodeColor | string or func | color | Node object accessor function or attribute for node color. |
| nodeAutoColorBy | string or func | | Node object accessor function or attribute to automatically group colors by. Only affects nodes without a color attribute. |
| nodeOpacity | number | 0.75 | Nodes sphere opacity, between [0,1]. |
| nodeResolution | number | 8 | Geometric resolution of each node's sphere, expressed in how many slice segments to divide the circumference. Higher values yield smoother spheres. Only applicable to 3D modes. |
| nodeThreeObject | Object3d, string or func | default 3D node object is a sphere, sized according to val and styled according to color. | Node object accessor function or attribute for generating a custom 3d object to render as graph nodes. Should return an instance of ThreeJS Object3d. If a falsy value is returned, the default 3d object type will be used instead for that node. |
| nodeThreeObjectExtend | bool, string or func | false | Node object accessor function, attribute or a boolean value for whether to replace the default node when using a custom nodeThreeObject (false) or to extend it (true). |
| nodePositionUpdate | func(nodeObject, coords, node) | | Custom function to call for updating the position of nodes at every render iteration. It receives the respective node ThreeJS Object3d, the coordinates of the node ({x,y,z} each), and the node's data. If the function returns a truthy value, the regular position update function will not run for that node. |

$3

| Prop | Type | Default | Description |
| --- | :--: | :--: | --- |
| linkVisibility| bool, string or func | true | Link object accessor function, attribute or a boolean constant for whether to display the link line. |
| linkColor| string or func | color | Link object accessor function or attribute for line color. |
| linkAutoColorBy | string or func | | Link object accessor function or attribute to automatically group colors by. Only affects links without a color attribute. |
| linkOpacity | number | 0.2 | Line opacity of links, between [0,1]. |
| linkWidth | number, string or func | 1 | Link object accessor function, attribute or a numeric constant for the link line width. |
| linkResolution | number | 6 | Geometric resolution of each link 3D line, expressed in how many radial segments to divide the cylinder. Higher values yield smoother cylinders. Applicable only to links with positive width. |
| linkCurvature | number, string or func | 0 | Link object accessor function, attribute or a numeric constant for the curvature radius of the link line. A value of 0 renders a straight line. 1 indicates a radius equal to half of the line length, causing the curve to approximate a semi-circle. For self-referencing links (source equal to target) the curve is represented as a loop around the node, with length proportional to the curvature value. |
| linkCurveRotation | number, string or func | 0 | Link object accessor function, attribute or a numeric constant for the rotation along the line axis to apply to the curve. Has no effect on straight lines. At 0 rotation, the curve is oriented in the direction of the intersection with the XY plane. The rotation angle (in radians) will rotate the curved line clockwise around the "start-to-end" axis from this reference orientation. |
| linkMaterial | Material, string or func | default link material is MeshLambertMaterial styled according to color and opacity. | Link object accessor function or attribute for specifying a custom material to style the graph links with. Should return an instance of ThreeJS Material. If a falsy value is returned, the default material will be used instead for that link. |
| linkThreeObject | Object3d, string or func | default 3D link object is a line or cylinder, sized according to width and styled according to material. | Link object accessor function or attribute for generating a custom 3d object to render as graph links. Should return an instance of ThreeJS Object3d. If a falsy value is returned, the default 3d object type will be used instead for that link. |
| linkThreeObjectExtend | bool, string or func | false | Link object accessor function, attribute or a boolean value for whether to replace the default link when using a custom linkThreeObject (false) or to extend it (true). |
| linkPositionUpdate | func(linkObject, { start, end }, link) | | Custom function to call for updating the position of links at every render iteration. It receives the respective link ThreeJS Object3d, the start and end coordinates of the link ({x,y,z} each), and the link's data. If the function returns a truthy value, the regular position update function will not run for that link. |
| linkDirectionalArrowLength | number, string or func | 0 | Link object accessor function, attribute or a numeric constant for the length of the arrow head indicating the link directionality. The arrow is displayed directly over the link line, and points in the direction of source > target. A value of 0 hides the arrow. |
| linkDirectionalArrowColor | string or func | color | Link object accessor function or attribute for the color of the arrow head. |
| linkDirectionalArrowRelPos | number, string or func | 0.5 | Link object accessor function, attribute or a numeric constant for the longitudinal position of the arrow head along the link line, expressed as a ratio between 0 and 1, where 0 indicates immediately next to the source node, 1 next to the target node, and 0.5 right in the middle. |
| linkDirectionalArrowResolution | number | 8 | Geometric resolution of the arrow head, expressed in how many slice segments to divide the cone base circumference. Higher values yield smoother arrows. |
| linkDirectionalParticles | number, string or func | 0 | Link object accessor function, attribute or a numeric constant for the number of particles (small spheres) to display over the link line. The particles are distributed equi-spaced along the line, travel in the direction source > target, and can be used to indicate link directionality. |
| linkDirectionalParticleSpeed | number, string or func | 0.01 | Link object accessor function, attribute or a numeric constant for the directional particles speed, expressed as the ratio of the link length to travel per frame. Values above 0.5 are discouraged. |
| linkDirectionalParticleOffset | number, string or func | 0 | Link object accessor function, attribute or a numeric constant for the offset of the directional particles initial position, expressed as a value between 0 and 1, relative to a full position cycle. |
| linkDirectionalParticleWidth | number, string or func | 0.5 | Link object accessor function, attribute or a numeric constant for the directional particles width. Values are rounded to the nearest decimal for indexing purposes. |
| linkDirectionalParticleColor | string or func | color | Link object accessor function or attribute for the directional particles color. |
| linkDirectionalParticleResolution | number | 4 | Geometric resolution of each 3D directional particle, expressed in how many slice segments to divide the circumference. Higher values yield smoother particles. |
| linkDirectionalParticleThreeObject | Object3d, string or func || Link object accessor function or attribute for a custom 3d object to use in the directional particles. Should return an instance of ThreeJS Object3d. Activating this will ignore the set values for the particle's width, color and resolution. |


| Method | Arguments | Description |
| --- | :--: | --- |
| emitParticle | (link) | An alternative mechanism for generating particles, this method emits a non-cyclical single particle within a specific link. The emitted particle shares the styling (speed, shape, color) of the regular particle props. A valid link object that is included in graphData should be passed as a single parameter. |

$3

| Prop | Type | Default | Description |
| --- | :--: | :--: | --- |
| numDimensions | 1, 2 or 3 | 3 | Number of dimensions to run the force simulation on. |
| forceEngine | string | d3 | Which force-simulation engine to use (d3 or ngraph). |
| dagMode | string | - | Apply layout constraints based on the graph directionality. Only works correctly for DAG graph structures (without cycles). Choice between td (top-down), bu (bottom-up), lr (left-to-right), rl (right-to-left), zout (near-to-far), zin (far-to-near), radialout (outwards-radially) or radialin (inwards-radially). |
| dagLevelDistance | number | auto-derived from the number of nodes | If dagMode is engaged, this specifies the distance between the different graph depths. |
| dagNodeFilter | func | node => true | Node accessor function to specify nodes to ignore during the DAG layout processing. This accessor method receives a node object and should return a boolean value indicating whether the node is to be included. Excluded nodes will be left unconstrained and free to move in any direction. |
| onDagError | func | - | Callback to invoke if a cycle is encountered while processing the data structure for a DAG layout. The loop segment of the graph is included for information, as an array of node ids. By default an exception will be thrown whenever a loop is encountered. You can override this method to handle this case externally and allow the graph to continue the DAG processing. Strict graph directionality is not guaranteed if a loop is encountered and the result is a best effort to establish a hierarchy. |
| d3AlphaMin | number | 0 | Sets the simulation alpha min parameter. Only applicable if using the d3 simulation engine. |
| d3AlphaDecay | number | 0.0228 | Sets the simulation intensity decay parameter. Only applicable if using the d3 simulation engine. |
| d3AlphaTarget | number | 0 | Sets the simulation alpha target parameter, only applicable if using the d3 simulation engine. |
| d3VelocityDecay | number | 0.4 | Nodes' velocity decay that simulates the medium resistance. Only applicable if using the d3 simulation engine. |
| ngraphPhysics | object | - | Specify custom physics configuration for ngraph, according to its configuration object syntax. Only applicable if using the ngraph simulation engine. |
| warmupTicks | number | 0 | Number of layout engine cycles to dry-run at ignition before starting to render. |
| cooldownTicks | number | Infinity | How many build-in frames to render before stopping and freezing the layout engine. |
| cooldownTime | number | 15000 | How long (ms) to render for before stopping and freezing the layout engine. |
| onEngineTick | func | - | Callback function invoked at every tick of the simulation engine. |
| onEngineStop | func | - | Callback function invoked when the simulation engine stops and the layout is frozen. |

| Method | Arguments | Description |
| --- | :--: | --- |
| d3Force | (string, [func]) | Access to the internal forces that control the d3 simulation engine. Follows the same interface as d3-force-3d's simulation.force. Three forces are included by default: 'link' (based on forceLink), 'charge' (based on forceManyBody) and 'center' (based on forceCenter). Each of these forces can be reconfigured, or new forces can be added to the system. Only applicable if using the d3 simulation engine. |
| d3ReheatSimulation | () | Reheats the force simulation engine, by setting the alpha value to 1. Only applicable if using the d3 simulation engine. |
| resetCountdown | () | Resets the engine countdown timer to the initial value. Useful when you want to keep the engine ticking for a while after the last user interaction. |

$3

| Prop | Type | Default | Description |
| --- | :--: | :--: | --- |
| onNodeClick | func | - | Callback function for node clicks. The node object and the event object are included as arguments onNodeClick(node, event). |
| onNodeHover | func | - | Callback function for node mouse over events. The node object (or null if there's no node under the pointer line of sight) is included as the first argument, and the previous node object (or null) as second argument: onNodeHover(node, prevNode). |
| onLinkClick | func | - | Callback function for link clicks. The link object and the event object are included as arguments onLinkClick(link, event). |
| onLinkHover | func | - | Callback function for link mouse over events. The link object (or null if there's no link under the pointer line of sight) is included as the first argument, and the previous link object (or null) as second argument: onLinkHover(link, prevLink). |

$3

| Prop | Type | Default | Description |
| --- | :--: | :--: | --- |
| onFinishUpdate | func | - | Callback function for notification that the component has finished updating, done iterating through the warmup phase (if needed) and the simulation engine has been resumed. |

| Method | Arguments | Description |
| --- | :--: | --- |
| tickFrame | - | This method should be called on each cycle of the global renderer to iterate the underlying force simulation engine and update the nodes/links objects' positions. |
| refresh | - | Redraws all the nodes/links. |

$3

| Method | Arguments | Description |
| --- | :--: | --- |
| getGraphBbox | ([nodeFilterFn]) | Returns the current bounding box of the nodes in the graph, formatted as { x: [, ], y: [, ], z: [, ] }. If no nodes are found, returns null. Accepts an optional argument to define a custom node filter: node => , which should return a truthy value if the node is to be included. This can be useful to calculate the bounding box of a portion of the graph. |

$3

`json
{
"nodes": [
{
"id": "id1",
"name": "name1",
"val": 1
},
{
"id": "id2",
"name": "name2",
"val": 10
},
...
],
"links": [
{
"source": "id1",
"target": "id2"
},
...
]
}
``

[npm-img]: https://img.shields.io/npm/v/r3f-forcegraph
[npm-url]: https://npmjs.org/package/r3f-forcegraph
[build-size-img]: https://img.shields.io/bundlephobia/minzip/r3f-forcegraph
[build-size-url]: https://bundlephobia.com/result?p=r3f-forcegraph
[npm-downloads-img]: https://img.shields.io/npm/dt/r3f-forcegraph
[npm-downloads-url]: https://www.npmtrends.com/r3f-forcegraph