init

.gitignore

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+# Based on https://raw.githubusercontent.com/github/gitignore/main/Node.gitignore
+
+# Logs
+
+logs
+_.log
+npm-debug.log_
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+.pnpm-debug.log*
+
+# Caches
+
+.cache
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+
+report.[0-9]_.[0-9]_.[0-9]_.[0-9]_.json
+
+# Runtime data
+
+pids
+_.pid
+_.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+
+lib-cov
+
+# Coverage directory used by tools like istanbul
+
+coverage
+*.lcov
+
+# nyc test coverage
+
+.nyc_output
+
+# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
+
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+
+bower_components
+
+# node-waf configuration
+
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+
+build/Release
+
+# Dependency directories
+
+node_modules/
+jspm_packages/
+
+# Snowpack dependency directory (https://snowpack.dev/)
+
+web_modules/
+
+# TypeScript cache
+
+*.tsbuildinfo
+
+# Optional npm cache directory
+
+.npm
+
+# Optional eslint cache
+
+.eslintcache
+
+# Optional stylelint cache
+
+.stylelintcache
+
+# Microbundle cache
+
+.rpt2_cache/
+.rts2_cache_cjs/
+.rts2_cache_es/
+.rts2_cache_umd/
+
+# Optional REPL history
+
+.node_repl_history
+
+# Output of 'npm pack'
+
+*.tgz
+
+# Yarn Integrity file
+
+.yarn-integrity
+
+# dotenv environment variable files
+
+.env
+.env.development.local
+.env.test.local
+.env.production.local
+.env.local
+
+# parcel-bundler cache (https://parceljs.org/)
+
+.parcel-cache
+
+# Next.js build output
+
+.next
+out
+
+# Nuxt.js build / generate output
+
+.nuxt
+dist
+
+# Gatsby files
+
+# Comment in the public line in if your project uses Gatsby and not Next.js
+
+# https://nextjs.org/blog/next-9-1#public-directory-support
+
+# public
+
+# vuepress build output
+
+.vuepress/dist
+
+# vuepress v2.x temp and cache directory
+
+.temp
+
+# Docusaurus cache and generated files
+
+.docusaurus
+
+# Serverless directories
+
+.serverless/
+
+# FuseBox cache
+
+.fusebox/
+
+# DynamoDB Local files
+
+.dynamodb/
+
+# TernJS port file
+
+.tern-port
+
+# Stores VSCode versions used for testing VSCode extensions
+
+.vscode-test
+
+# yarn v2
+
+.yarn/cache
+.yarn/unplugged
+.yarn/build-state.yml
+.yarn/install-state.gz
+.pnp.*
+
+# IntelliJ based IDEs
+.idea
+
+# Finder (MacOS) folder config
+.DS_Store
+
+output
+assets

README.md

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+# generative-art
+
+To install dependencies:
+
+```bash
+bun install
+```
+
+To run:
+
+```bash
+bun run index.ts
+```
+
+This project was created using `bun init` in bun v1.0.33. [Bun](https://bun.sh) is a fast all-in-one JavaScript runtime.

index.ts

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+import sharp, { type OverlayOptions } from 'sharp';
+import { LAYERS, weightedChoice } from './layers';
+
+const BASE_SHAPE_PATH = './assets/base_shape.png';
+
+export type Trait = 'skin' | 'nose' | 'eyes' | 'mouth' | 'detail';
+
+export type Layer = {
+    trait: Trait,
+    path: string,
+    chance?: number,
+    options: TraitOption[]
+};
+
+export type TraitOption = {
+    fileName: string,
+    weight?: number
+};
+
+async function generateRandomImage(fileName: string, orderedLayers: Layer[]) {
+    const layers: { input: string }[] = [];
+
+    for (const layer of orderedLayers) {
+        if (layer.chance && Math.random() > layer.chance) {
+            continue;
+        }
+
+        const choice = weightedChoice(layer.options);
+
+        layers.push({ input: `${layer.path}${choice}` });
+    }
+
+    const image = sharp(BASE_SHAPE_PATH).composite(layers);
+
+    await Bun.write(`./output/${fileName}`, await image.toBuffer());
+}
+
+for (let i = 0; i < 100; i++) {
+    await generateRandomImage(`characters/${i}.png`, LAYERS);
+}
+
+// combine into a single grid image
+const characters: OverlayOptions[] = [];
+for (let i = 0; i < 100; i++) {
+    characters.push({ input: `./output/characters/${i}.png`, left: (i % 10) * 16, top: Math.floor(i / 10.0) * 16 });
+}
+
+const grid = sharp({ create: { width: 160, height: 160, channels: 4, background: { r: 0, g: 0, b: 0, alpha: 0 } } }).composite(characters).png();
+
+await Bun.write('./output/grid.png', await grid.toBuffer());
+
+console.log('Finished generation');

layers.ts

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+import type { Layer, TraitOption } from ".";
+
+export const LAYERS: Layer[] = [
+    {
+        trait: 'skin',
+        path: './assets/skin/',
+        options: [
+            { fileName: 'sand.png' },
+            { fileName: 'sienna.png' },
+            { fileName: 'bole.png' },
+            { fileName: 'chocolate.png' }
+        ]
+    },
+    {
+        trait: 'nose',
+        path: './assets/nose/',
+        options: [
+            { fileName: 'small.png' },
+            { fileName: 'big.png' }
+        ]
+    },
+    {
+        trait: 'eyes',
+        path: './assets/eyes/',
+        options: [
+            { fileName: 'blue.png', weight: 27 },
+            { fileName: 'green.png', weight: 9 },
+            { fileName: 'brown.png', weight: 19 },
+            { fileName: 'dark_brown.png', weight: 45 }
+        ]
+    },
+    {
+        trait: 'mouth',
+        path: './assets/mouth/',
+        options: [
+            { fileName: 'neutral.png', weight: 8 },
+            { fileName: 'happy.png', weight: 4 },
+            { fileName: 'smirk.png', weight: 2 },
+            { fileName: 'shock.png', weight: 1 }
+        ]
+    },
+    {
+        trait: 'detail',
+        chance: 0.1,
+        path: './assets/detail/',
+        options: [
+            { fileName: 'halo.png', weight: 1 },
+            { fileName: 'red_beanie.png', weight: 25 },
+            { fileName: 'green_beanie.png', weight: 25 }
+        ]
+    }
+];
+
+export function weightedChoice(options: TraitOption[]): string {
+    let i;
+
+    let weights: number[] = [options[0].weight ?? 1];
+
+    for (i = 1; i < options.length; i++) {
+        weights[i] = (options[i].weight ?? 1) + weights[i - 1];
+    }
+
+    const random = Math.random() * weights[weights.length - 1];
+
+    for (i = 0; i < weights.length; i++) {
+        if (weights[i] > random) {
+            break;
+        }
+    }
+
+    return options[i].fileName;
+}

package.json

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+{
+  "name": "generative-art",
+  "module": "index.ts",
+  "devDependencies": {
+    "@types/bun": "latest"
+  },
+  "peerDependencies": {
+    "typescript": "^5.0.0"
+  },
+  "type": "module",
+  "dependencies": {
+    "sharp": "^0.33.2"
+  }
+}

tsconfig.json

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+{
+  "compilerOptions": {
+    // Enable latest features
+    "lib": ["ESNext"],
+    "target": "ESNext",
+    "module": "ESNext",
+    "moduleDetection": "force",
+    "jsx": "react-jsx",
+    "allowJs": true,
+
+    // Bundler mode
+    "moduleResolution": "bundler",
+    "allowImportingTsExtensions": true,
+    "verbatimModuleSyntax": true,
+    "noEmit": true,
+
+    // Best practices
+    "strict": true,
+    "skipLibCheck": true,
+    "noFallthroughCasesInSwitch": true,
+
+    // Some stricter flags (disabled by default)
+    "noUnusedLocals": false,
+    "noUnusedParameters": false,
+    "noPropertyAccessFromIndexSignature": false
+  }
+}