feat: add color to sockets

Closes #34

app/src/lib/graph-interface/edges/Edge.svelte

@@ -6,15 +6,12 @@
     toneMapped: false
   });
 
-  let lineColor = $state(colors.outline.clone().convertSRGBToLinear());
-
   $effect.root(() => {
     $effect(() => {
       if (appSettings.value.theme === undefined) {
         return;
       }
       circleMaterial.color = colors.outline.clone().convertSRGBToLinear();
-      lineColor = colors.outline.clone().convertSRGBToLinear();
     });
   });
 
@@ -35,6 +32,7 @@
   import { CubicBezierCurve } from 'three/src/extras/curves/CubicBezierCurve.js';
   import { Vector2 } from 'three/src/math/Vector2.js';
   import { getGraphState } from '../graph-state.svelte';
+  import MeshGradientLineMaterial from './MeshGradientLine/MeshGradientLineMaterial.svelte';
 
   const graphState = getGraphState();
 
@@ -45,12 +43,17 @@
     y2: number;
     z: number;
     id?: string;
+    inputType?: string;
+    outputType?: string;
   };
 
-  const { x1, y1, x2, y2, z, id }: Props = $props();
+  const { x1, y1, x2, y2, z, inputType = 'unknown', outputType = 'unknown', id }: Props = $props();
 
   const thickness = $derived(Math.max(0.001, 0.00082 * Math.exp(0.055 * z)));
 
+  const inputColor = $derived(graphState.colors.getColor(inputType));
+  const outputColor = $derived(graphState.colors.getColor(outputType));
+
   let points = $state<Vector3[]>([]);
 
   let lastId: string | null = null;
@@ -106,9 +109,9 @@
   position.z={y1}
   position.y={0.8}
   rotation.x={-Math.PI / 2}
-  material={circleMaterial}
 >
   <T.CircleGeometry args={[0.5, 16]} />
+  <T.MeshBasicMaterial color={inputColor} toneMapped={false} />
 </T.Mesh>
 
 <T.Mesh
@@ -119,6 +122,7 @@
   material={circleMaterial}
 >
   <T.CircleGeometry args={[0.5, 16]} />
+  <T.MeshBasicMaterial color={outputColor} toneMapped={false} />
 </T.Mesh>
 
 {#if graphState.hoveredEdgeId === id}
@@ -126,7 +130,8 @@
     <MeshLineGeometry {points} />
     <MeshLineMaterial
       width={thickness * 5}
-      color={lineColor}
+      color={inputColor}
+      tonemapped={false}
       opacity={0.5}
       transparent
     />
@@ -135,5 +140,10 @@
 
 <T.Mesh position.x={x1} position.z={y1} position.y={0.1}>
   <MeshLineGeometry {points} />
-  <MeshLineMaterial width={thickness} color={lineColor} />
+  <MeshGradientLineMaterial
+    width={thickness}
+    colorStart={inputColor}
+    colorEnd={outputColor}
+    tonemapped={false}
+  />
 </T.Mesh>

app/src/lib/graph-interface/edges/MeshGradientLine/MeshGradientLineMaterial.svelte

@@ -23,6 +23,7 @@
 
   let { invalidate, size } = useThrelte();
 
+  // svelte-ignore state_referenced_locally
   const uniforms = {
     lineWidth: { value: width },
     colorStart: { value: new Color(colorStart) },

app/src/lib/graph-interface/graph-state.svelte.ts

@@ -3,6 +3,7 @@ import { getContext, setContext } from 'svelte';
 import { SvelteMap, SvelteSet } from 'svelte/reactivity';
 import type { OrthographicCamera, Vector3 } from 'three';
 import type { GraphManager } from './graph-manager.svelte';
+import { ColorGenerator } from './graph/colors';
 import { getNodeHeight, getSocketPosition } from './helpers/nodeHelpers';
 
 const graphStateKey = Symbol('graph-state');
@@ -28,7 +29,32 @@ type EdgeData = {
   points: Vector3[];
 };
 
+const predefinedColors = {
+  path: {
+    hue: 80,
+    lightness: 20,
+    saturation: 80
+  },
+  float: {
+    hue: 70,
+    lightness: 10,
+    saturation: 0
+  },
+  geometry: {
+    hue: 0,
+    lightness: 50,
+    saturation: 70
+  },
+  '*': {
+    hue: 200,
+    lightness: 20,
+    saturation: 100
+  }
+} as const;
+
 export class GraphState {
+  colors = new ColorGenerator(predefinedColors);
+
   constructor(private graph: GraphManager) {
     $effect.root(() => {
       $effect(() => {

app/src/lib/graph-interface/graph/Graph.svelte

@@ -95,6 +95,13 @@
     graphState.activeSocket = null;
     graphState.addMenuPosition = null;
   }
+
+  function getSocketType(node: NodeInstance, index: number | string): string {
+    if (typeof index === 'string') {
+      return node.state.type?.inputs?.[index].type || 'unknown';
+    }
+    return node.state.type?.outputs?.[index] || 'unknown';
+  }
 </script>
 
 <svelte:window
@@ -175,6 +182,8 @@
       {#if graphState.activeSocket}
         <EdgeEl
           z={graphState.cameraPosition[2]}
+          inputType={getSocketType(graphState.activeSocket.node, graphState.activeSocket.index)}
+          outputType={getSocketType(graphState.activeSocket.node, graphState.activeSocket.index)}
           x1={graphState.activeSocket.position[0]}
           y1={graphState.activeSocket.position[1]}
           x2={graphState.edgeEndPosition?.[0] ?? graphState.mousePosition[0]}
@@ -187,6 +196,8 @@
         <EdgeEl
           id={graph.getEdgeId(edge)}
           z={graphState.cameraPosition[2]}
+          inputType={getSocketType(edge[0], edge[1])}
+          outputType={getSocketType(edge[2], edge[3])}
           {x1}
           {y1}
           {x2}

app/src/lib/graph-interface/graph/colors.ts

@@ -0,0 +1,45 @@
+type Color = { hue: number; saturation: number; lightness: number };
+
+export class ColorGenerator {
+  private colors: Map<string, Color> = new Map();
+  private lightnessLevels = [10, 60];
+
+  constructor(predefined: Record<string, Color>) {
+    for (const [id, colorStr] of Object.entries(predefined)) {
+      this.colors.set(id, colorStr);
+    }
+  }
+
+  public getColor(id: string): string {
+    if (this.colors.has(id)) {
+      return this.colorToHsl(this.colors.get(id)!);
+    }
+
+    const newColor = this.generateNewColor();
+    this.colors.set(id, newColor);
+    console.log(id, newColor);
+    return this.colorToHsl(newColor);
+  }
+
+  private generateNewColor(): Color {
+    const existingHues = Array.from(this.colors.values()).map(c => c.hue).sort();
+    let hue = existingHues[0];
+    let attempts = 0;
+
+    while (
+      existingHues.some(h => Math.abs(h - hue) < 30 || Math.abs(h - hue) > 330)
+      && attempts < 360
+    ) {
+      hue = (hue + 30) % 360;
+      attempts++;
+    }
+
+    const lightness = 60;
+
+    return { hue, lightness, saturation: 100 };
+  }
+
+  private colorToHsl(c: Color): string {
+    return `hsl(${c.hue}, ${c.saturation}%, ${c.lightness}%)`;
+  }
+}

app/src/lib/graph-interface/node/NodeHeader.svelte

@@ -1,6 +1,6 @@
 <script lang="ts">
   import { appSettings } from '$lib/settings/app-settings.svelte';
-  import type { NodeInstance } from '@nodarium/types';
+  import type { NodeInstance, Socket } from '@nodarium/types';
   import { getGraphState } from '../graph-state.svelte';
   import { createNodePath } from '../helpers/index.js';
   import { getSocketPosition } from '../helpers/nodeHelpers';
@@ -47,12 +47,23 @@
   );
 
   const socketId = $derived(`${node.id}-${0}`);
+
+  function getSocketType(s: Socket | null) {
+    if (!s) return 'unknown';
+    if (typeof s.index === 'string') {
+      return s.node.state.type?.inputs?.[s.index].type || 'unknown';
+    }
+    return s.node.state.type?.outputs?.[s.index] || 'unknown';
+  }
+  const socketType = $derived(getSocketType(graphState.activeSocket));
+  const hoverColor = $derived(graphState.colors.getColor(socketType));
 </script>
 
 <div
   class="wrapper"
   data-node-id={node.id}
   data-node-type={node.type}
+  style:--socket-color={hoverColor}
   class:possible-socket={graphState?.possibleSocketIds.has(socketId)}
 >
   <div class="content">
@@ -96,10 +107,10 @@
     width: 30px;
     height: 30px;
     border-radius: 100%;
-    box-shadow: 0px 0px 10px var(--color-layer-3);
+    box-shadow: 0px 0px 10px var(--socket-color);
-    background-color: var(--color-layer-3);
+    background-color: var(--socket-color);
-    outline: solid thin white;
+    outline: solid thin var(--socket-color);
-    opacity: 0.2;
+    opacity: 0.7;
     z-index: -10;
   }
 

app/src/lib/graph-interface/node/NodeParameter.svelte

@@ -1,5 +1,5 @@
 <script lang="ts">
-  import type { NodeInput, NodeInstance } from '@nodarium/types';
+  import type { NodeInput, NodeInstance, Socket } from '@nodarium/types';
   import { getGraphManager, getGraphState } from '../graph-state.svelte';
   import { createNodePath } from '../helpers';
   import { getParameterHeight, getSocketPosition } from '../helpers/nodeHelpers';
@@ -60,6 +60,17 @@
       aspectRatio
     })
   );
+
+  function getSocketType(s: Socket | null) {
+    if (!s) return 'unknown';
+    if (typeof s.index === 'string') {
+      return s.node.state.type?.inputs?.[s.index].type || 'unknown';
+    }
+    return s.node.state.type?.outputs?.[s.index] || 'unknown';
+  }
+
+  const socketType = $derived(getSocketType(graphState.activeSocket));
+  const hoverColor = $derived(graphState.colors.getColor(socketType));
 </script>
 
 <div
@@ -67,6 +78,7 @@
   data-node-type={node.type}
   data-node-input={id}
   style:height="{height}px"
+  style:--socket-color={hoverColor}
   class:possible-socket={graphState?.possibleSocketIds.has(socketId)}
 >
   {#key id && graphId}
@@ -95,10 +107,8 @@
     xmlns="http://www.w3.org/2000/svg"
     viewBox="0 0 100 100"
     preserveAspectRatio="none"
-    style={`
+    style:--path={`path("${path}")`}
-      --path: path("${path}");
+    style:--hover-path={`path("${pathHover}")`}
-      --hover-path: path("${pathHover}");
-    `}
   >
     <path vector-effect="non-scaling-stroke"></path>
   </svg>
@@ -126,10 +136,10 @@
     width: 30px;
     height: 30px;
     border-radius: 100%;
-    box-shadow: 0px 0px 10px var(--color-layer-3);
+    box-shadow: 0px 0px 10px var(--socket-color);
-    background-color: var(--color-layer-3);
+    background-color: var(--socket-color);
-    outline: solid thin white;
+    outline: solid thin var(--socket-color);
-    opacity: 0.2;
+    opacity: 0.5;
     z-index: -10;
   }