v1

Author: sojs-coder

.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

Math/Vector.ts

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+export class Vector {
+    x: number;
+    y: number;
+    constructor(x: number, y: number) {
+        this.x = x;
+        this.y = y;
+    }
+
+    add(other: number | Vector): Vector {
+        if (other instanceof Vector) {
+            return new Vector(this.x + other.x, this.y + other.y);
+        }
+        return new Vector(this.x + other, this.y + other);
+    }
+    subtract(other: number | Vector): Vector {
+        if (other instanceof Vector) {
+            return new Vector(this.x - other.x, this.y - other.y);
+        }
+        return new Vector(this.x - other, this.y - other);
+    }
+    multiply(other: number | Vector): Vector {
+        if (other instanceof Vector) {
+            return new Vector(this.x * other.x, this.y * other.y);
+        }
+        return new Vector(this.x * other, this.y * other);
+    }
+    divide(other: number | Vector): Vector {
+        if (other instanceof Vector) {
+            if (other.x === 0 || other.y === 0) throw new Error("Cannot divide by zero");
+            return new Vector(this.x / other.x, this.y / other.y);
+        }
+        if (other === 0) throw new Error("Cannot divide by zero");
+        return new Vector(this.x / other, this.y / other);
+    }
+    length(): number {
+        return Math.sqrt(this.x * this.x + this.y * this.y);
+    }
+    toString(): string {
+        return `[${this.x}, ${this.y}]`;
+    }
+    normalize(): Vector {
+        const len = this.length();
+        if (len === 0) throw new Error("Cannot normalize zero-length vector");
+        return new Vector(this.x / len, this.y / len);
+    }
+    dot(other: Vector): number {
+        return this.x * other.x + this.y * other.y;
+    }
+    static From(scalar: number): Vector {
+        return new Vector(scalar, scalar);
+    }
+}

Parts/Camera.ts

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+import { Vector } from "../Math/Vector";
+import { Transform } from "./Children/Transform";
+import { Part } from "./Part";
+import { Scene } from "./Scene";
+
+
+export class Camera extends Part {
+    zoom: Vector;
+
+    constructor({ name, position = new Vector(0, 0), zoom = Vector.From(1) }: { name: string, position: Vector, zoom?: Vector }) {
+        super();
+        this.name = name;
+        this.zoom = zoom;
+        this.debugEmoji = "📷"; // Camera specific emoji for debugging
+
+        this.addChild(new Transform({ position })); // Add a Transform part for position
+
+    }
+
+    onMount(parent: Part) {
+        super.onMount(parent);
+        let currentParent: Part | undefined = this.parent;
+        while (currentParent) {
+            if (currentParent instanceof Scene) {
+                currentParent.activeCamera = this;
+                return;
+            }
+            currentParent = currentParent.parent;
+        }
+        throw new Error("Camera must be mounted to a Scene (or a child of a Scene) to be registered.");
+    }
+
+    setActive() {
+        // Set this camera as the active camera for the layer's parent (scene)
+        if (this.registrations.layer && this.registrations.layer.parent) {
+            this.registrations.layer.parent.activeCamera = this;
+        } else {
+            throw new Error("Camera must be mounted to a Layer with a parent Scene to be set active.");
+        }
+    }
+
+    getViewMatrix(): { offset: Vector; scale: Vector } {
+        // Could be used in rendering context
+        return {
+            offset: (this.children["Transform"] as Transform).worldPosition.multiply(-1), // View shift is inverse of camera
+            scale: this.zoom
+        };
+    }
+
+    act() {
+        super.act();
+        const transform = this.children["Transform"] as Transform;
+        if (transform) {
+            this.zoom = transform.scale;
+        }
+    }
+
+}