feat: add onHover callback, prove out how to draw connections

src/Points.tsx

@@ -47,6 +47,14 @@ export type PointsProps = {
    * Callback for when point(s) gets selected. Returns the selected points that correspond to the ray trace hit
    */
   onPointsClicked?: (points: PointBaseProps[]) => void;
+  /**
+   * Callback for when a point is hovered
+   */
+  onPointHovered?: (points: PointBaseProps) => void;
+  /**
+   * Callback for when the mouse pointer leaves the point meshes. Best used to detect when  the mouse is no longer over ANY point
+   */
+  onPointerLeave?: () => void;
   /**
    * The shape of the points. This value must be uniform for all points.
    * @default 'sphere'
@@ -72,6 +80,8 @@ export function Points({
   pointProps = defaultPointMeshProps,
   onPointsClicked,
   onPointClicked,
+  onPointHovered,
+  onPointerLeave,
   pointShape = 'sphere',
   opacity = 1,
   material = 'meshMatcap',
@@ -206,6 +216,21 @@ export function Points({
             onPointClicked(data[instanceIds[0]]);
         }
       }}
+      onPointerOver={(e) => {
+        if (e.intersections) {
+          const instanceIds = e.intersections
+            .map((e) => e?.instanceId)
+            .filter((i): i is NonNullable<typeof i> => i != null);
+
+          // Single instance callback
+          instanceIds.length > 0 &&
+            onPointHovered &&
+            onPointHovered(data[instanceIds[0]]);
+        }
+      }}
+      onPointerLeave={() => {
+        onPointerLeave && onPointerLeave();
+      }}
     >
       {geometryEl}
       {materialEl}

stories/Connections.stories.tsx

@@ -0,0 +1,138 @@
+import React, { startTransition, useRef, useState } from 'react';
+import { Meta, Story } from '@storybook/react';
+import {
+  Axes,
+  PointBaseProps,
+  Points,
+  ThreeDimensionalBounds,
+  ThreeDimensionalCanvas,
+  ThreeDimensionalControls,
+  ThreeDimensionalPoint,
+  getThreeDimensionalBounds,
+} from '../src';
+
+import _data from './data/point-cloud-3d.json';
+import { Container, ToolName } from './components';
+import { QuadraticBezierLine } from '@react-three/drei';
+import { useFrame } from '@react-three/fiber';
+
+const data = _data as unknown as Array<PointBaseProps>;
+
+const meta: Meta = {
+  title: 'Connections',
+};
+
+const connections: Array<{
+  id: string;
+  start: ThreeDimensionalPoint;
+  end: ThreeDimensionalPoint;
+}> = [];
+
+const CONNECTIONS_PER_POINT = 10;
+for (let i = CONNECTIONS_PER_POINT; i < data.length; i++) {
+  const startPoint = data[i];
+  const x = startPoint.position[0];
+  const y = startPoint.position[1];
+  const z = startPoint.position[2] as number;
+  const start: ThreeDimensionalPoint = [x, y, z];
+  for (let j = 0; j < CONNECTIONS_PER_POINT; j++) {
+    const endPoint = data[i - j - 1];
+    const x2 = endPoint.position[0];
+    const y2 = endPoint.position[1];
+    const z2 = endPoint.position[2] as number;
+    const end: ThreeDimensionalPoint = [x2, y2, z2];
+    connections.push({ id: startPoint.metaData.uuid, start, end });
+  }
+}
+
+export default meta;
+
+export function Default() {
+  const [tool, setTool] = useState<ToolName>('move');
+  const bounds = React.useMemo(() => {
+    return getThreeDimensionalBounds([
+      ...data.map((d) => d.position as ThreeDimensionalPoint),
+    ]);
+  }, []);
+  return (
+    <Container showToolbar selectedTool={tool} onToolChange={setTool}>
+      <ThreeDimensionalCanvas camera={{ zoom: 1, up: [0, 0, 1] }}>
+        <ambientLight intensity={0.5} />
+        <pointLight position={[0, 0, 10]} />
+        <ThreeDimensionalControls />
+        <ThreeDimensionalBounds bounds={bounds}>
+          <Axes size={bounds.maxX - bounds.minX} />
+          <PointsWithConnections />
+        </ThreeDimensionalBounds>
+      </ThreeDimensionalCanvas>
+    </Container>
+  );
+}
+
+function PointsWithConnections() {
+  const lineWidth = 1;
+  const group = useRef<THREE.Group>(null);
+  const [selectedPoint, setSelectedPoint] =
+    useState<PointBaseProps | null>(null);
+  const filteredConnections = connections.filter((connection) => {
+    return connection.id === selectedPoint?.metaData.uuid;
+  });
+  useFrame((_, delta) => {
+    if (group.current) {
+      group.current.children.forEach(
+        (group) =>
+          // @ts-ignore
+          (group.children[0].material.uniforms.dashOffset.value -= delta * 5)
+      );
+    }
+  });
+  return (
+    <>
+      <Points
+        data={data}
+        pointProps={{
+          color: 'limegreen',
+        }}
+        onPointHovered={(point) => {
+          startTransition(() => {
+            setSelectedPoint(point);
+          });
+        }}
+        onPointerLeave={() => {
+          startTransition(() => {
+            setSelectedPoint(null);
+          });
+        }}
+      />
+      <group ref={group}>
+        {filteredConnections.map((connection, i) => {
+          return (
+            <group>
+              <QuadraticBezierLine
+                key={i}
+                start={connection.start}
+                end={connection.end}
+                color="white"
+                opacity={1}
+                transparent
+                dashed
+                dashScale={50}
+                gapSize={20}
+                lineWidth={lineWidth}
+              />
+              <QuadraticBezierLine
+                key={i}
+                start={connection.start}
+                end={connection.end}
+                color="white"
+                lineWidth={lineWidth / 2}
+                transparent
+                opacity={0.8}
+              />
+            </group>
+          );
+        })}
+      </group>
+    </>
+  );
+}