diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..76add87
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+node_modules
+dist
\ No newline at end of file
diff --git a/demo/index.html b/demo/index.html
new file mode 100644
index 0000000..c54754b
--- /dev/null
+++ b/demo/index.html
@@ -0,0 +1,25 @@
+
+
+
+
+
+ Spatial Canvas Primitives
+
+
+
+ Spatial Canvas Primitives
+
+
+
+
diff --git a/demo/shapes.html b/demo/shapes.html
new file mode 100644
index 0000000..acbb7d0
--- /dev/null
+++ b/demo/shapes.html
@@ -0,0 +1,34 @@
+
+
+
+
+
+ Shapes
+
+
+
+ Shape with some text
+
+
+
+
diff --git a/demo/vite.config.ts b/demo/vite.config.ts
new file mode 100644
index 0000000..13ba4fd
--- /dev/null
+++ b/demo/vite.config.ts
@@ -0,0 +1,20 @@
+import { resolve } from 'node:path';
+import { readdirSync } from 'node:fs';
+import { defineConfig } from 'vite';
+
+export default defineConfig({
+ build: {
+ target: 'esnext',
+ rollupOptions: {
+ input: readdirSync(__dirname)
+ .filter((file) => file.endsWith('.html'))
+ .reduce((acc, file) => {
+ acc[file.replace('.html', '')] = resolve(__dirname, file);
+ return acc;
+ }, {} as Record),
+ },
+ modulePreload: {
+ polyfill: false,
+ },
+ },
+});
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..ef68b1b
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,831 @@
+{
+ "name": "spatial-canvas-primitives",
+ "lockfileVersion": 3,
+ "requires": true,
+ "packages": {
+ "": {
+ "devDependencies": {
+ "@types/node": "^20.12.7",
+ "typescript": "^5.0.0",
+ "vite": "^5.0.0"
+ }
+ },
+ "node_modules/@esbuild/aix-ppc64": {
+ "version": "0.21.5",
+ "resolved": "https://registry.npmjs.org/@esbuild/aix-ppc64/-/aix-ppc64-0.21.5.tgz",
+ "integrity": "sha512-1SDgH6ZSPTlggy1yI6+Dbkiz8xzpHJEVAlF/AM1tHPLsf5STom9rwtjE4hKAF20FfXXNTFqEYXyJNWh1GiZedQ==",
+ "cpu": [
+ "ppc64"
+ ],
+ "dev": true,
+ "optional": true,
+ "os": [
+ "aix"
+ ],
+ "engines": {
+ "node": ">=12"
+ }
+ },
+ "node_modules/@esbuild/android-arm": {
+ "version": "0.21.5",
+ "resolved": "https://registry.npmjs.org/@esbuild/android-arm/-/android-arm-0.21.5.tgz",
+ "integrity": "sha512-vCPvzSjpPHEi1siZdlvAlsPxXl7WbOVUBBAowWug4rJHb68Ox8KualB+1ocNvT5fjv6wpkX6o/iEpbDrf68zcg==",
+ "cpu": [
+ "arm"
+ ],
+ "dev": true,
+ "optional": true,
+ "os": [
+ "android"
+ ],
+ "engines": {
+ "node": ">=12"
+ }
+ },
+ "node_modules/@esbuild/android-arm64": {
+ "version": "0.21.5",
+ "resolved": "https://registry.npmjs.org/@esbuild/android-arm64/-/android-arm64-0.21.5.tgz",
+ "integrity": "sha512-c0uX9VAUBQ7dTDCjq+wdyGLowMdtR/GoC2U5IYk/7D1H1JYC0qseD7+11iMP2mRLN9RcCMRcjC4YMclCzGwS/A==",
+ "cpu": [
+ "arm64"
+ ],
+ "dev": true,
+ "optional": true,
+ "os": [
+ "android"
+ ],
+ "engines": {
+ "node": ">=12"
+ }
+ },
+ "node_modules/@esbuild/android-x64": {
+ "version": "0.21.5",
+ "resolved": "https://registry.npmjs.org/@esbuild/android-x64/-/android-x64-0.21.5.tgz",
+ "integrity": "sha512-D7aPRUUNHRBwHxzxRvp856rjUHRFW1SdQATKXH2hqA0kAZb1hKmi02OpYRacl0TxIGz/ZmXWlbZgjwWYaCakTA==",
+ "cpu": [
+ "x64"
+ ],
+ "dev": true,
+ "optional": true,
+ "os": [
+ "android"
+ ],
+ "engines": {
+ "node": ">=12"
+ }
+ },
+ "node_modules/@esbuild/darwin-arm64": {
+ "version": "0.21.5",
+ "resolved": "https://registry.npmjs.org/@esbuild/darwin-arm64/-/darwin-arm64-0.21.5.tgz",
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+ "cpu": [
+ "arm64"
+ ],
+ "dev": true,
+ "optional": true,
+ "os": [
+ "darwin"
+ ],
+ "engines": {
+ "node": ">=12"
+ }
+ },
+ "node_modules/@esbuild/darwin-x64": {
+ "version": "0.21.5",
+ "resolved": "https://registry.npmjs.org/@esbuild/darwin-x64/-/darwin-x64-0.21.5.tgz",
+ "integrity": "sha512-se/JjF8NlmKVG4kNIuyWMV/22ZaerB+qaSi5MdrXtd6R08kvs2qCN4C09miupktDitvh8jRFflwGFBQcxZRjbw==",
+ "cpu": [
+ "x64"
+ ],
+ "dev": true,
+ "optional": true,
+ "os": [
+ "darwin"
+ ],
+ "engines": {
+ "node": ">=12"
+ }
+ },
+ "node_modules/@esbuild/freebsd-arm64": {
+ "version": "0.21.5",
+ "resolved": "https://registry.npmjs.org/@esbuild/freebsd-arm64/-/freebsd-arm64-0.21.5.tgz",
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+ "cpu": [
+ "arm64"
+ ],
+ "dev": true,
+ "optional": true,
+ "os": [
+ "freebsd"
+ ],
+ "engines": {
+ "node": ">=12"
+ }
+ },
+ "node_modules/@esbuild/freebsd-x64": {
+ "version": "0.21.5",
+ "resolved": "https://registry.npmjs.org/@esbuild/freebsd-x64/-/freebsd-x64-0.21.5.tgz",
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+ "cpu": [
+ "x64"
+ ],
+ "dev": true,
+ "optional": true,
+ "os": [
+ "freebsd"
+ ],
+ "engines": {
+ "node": ">=12"
+ }
+ },
+ "node_modules/@esbuild/linux-arm": {
+ "version": "0.21.5",
+ "resolved": "https://registry.npmjs.org/@esbuild/linux-arm/-/linux-arm-0.21.5.tgz",
+ "integrity": "sha512-bPb5AHZtbeNGjCKVZ9UGqGwo8EUu4cLq68E95A53KlxAPRmUyYv2D6F0uUI65XisGOL1hBP5mTronbgo+0bFcA==",
+ "cpu": [
+ "arm"
+ ],
+ "dev": true,
+ "optional": true,
+ "os": [
+ "linux"
+ ],
+ "engines": {
+ "node": ">=12"
+ }
+ },
+ "node_modules/@esbuild/linux-arm64": {
+ "version": "0.21.5",
+ "resolved": "https://registry.npmjs.org/@esbuild/linux-arm64/-/linux-arm64-0.21.5.tgz",
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+ "cpu": [
+ "arm64"
+ ],
+ "dev": true,
+ "optional": true,
+ "os": [
+ "linux"
+ ],
+ "engines": {
+ "node": ">=12"
+ }
+ },
+ "node_modules/@esbuild/linux-ia32": {
+ "version": "0.21.5",
+ "resolved": "https://registry.npmjs.org/@esbuild/linux-ia32/-/linux-ia32-0.21.5.tgz",
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+ "cpu": [
+ "ia32"
+ ],
+ "dev": true,
+ "optional": true,
+ "os": [
+ "linux"
+ ],
+ "engines": {
+ "node": ">=12"
+ }
+ },
+ "node_modules/@esbuild/linux-loong64": {
+ "version": "0.21.5",
+ "resolved": "https://registry.npmjs.org/@esbuild/linux-loong64/-/linux-loong64-0.21.5.tgz",
+ "integrity": "sha512-uHf1BmMG8qEvzdrzAqg2SIG/02+4/DHB6a9Kbya0XDvwDEKCoC8ZRWI5JJvNdUjtciBGFQ5PuBlpEOXQj+JQSg==",
+ "cpu": [
+ "loong64"
+ ],
+ "dev": true,
+ "optional": true,
+ "os": [
+ "linux"
+ ],
+ "engines": {
+ "node": ">=12"
+ }
+ },
+ "node_modules/@esbuild/linux-mips64el": {
+ "version": "0.21.5",
+ "resolved": "https://registry.npmjs.org/@esbuild/linux-mips64el/-/linux-mips64el-0.21.5.tgz",
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+ "cpu": [
+ "mips64el"
+ ],
+ "dev": true,
+ "optional": true,
+ "os": [
+ "linux"
+ ],
+ "engines": {
+ "node": ">=12"
+ }
+ },
+ "node_modules/@esbuild/linux-ppc64": {
+ "version": "0.21.5",
+ "resolved": "https://registry.npmjs.org/@esbuild/linux-ppc64/-/linux-ppc64-0.21.5.tgz",
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+ "cpu": [
+ "ppc64"
+ ],
+ "dev": true,
+ "optional": true,
+ "os": [
+ "linux"
+ ],
+ "engines": {
+ "node": ">=12"
+ }
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+ "node_modules/@esbuild/linux-riscv64": {
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+ "cpu": [
+ "riscv64"
+ ],
+ "dev": true,
+ "optional": true,
+ "os": [
+ "linux"
+ ],
+ "engines": {
+ "node": ">=12"
+ }
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+ "resolved": "https://registry.npmjs.org/@esbuild/linux-s390x/-/linux-s390x-0.21.5.tgz",
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+ "cpu": [
+ "s390x"
+ ],
+ "dev": true,
+ "optional": true,
+ "os": [
+ "linux"
+ ],
+ "engines": {
+ "node": ">=12"
+ }
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+ "resolved": "https://registry.npmjs.org/@esbuild/linux-x64/-/linux-x64-0.21.5.tgz",
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+ "cpu": [
+ "x64"
+ ],
+ "dev": true,
+ "optional": true,
+ "os": [
+ "linux"
+ ],
+ "engines": {
+ "node": ">=12"
+ }
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+ "cpu": [
+ "x64"
+ ],
+ "dev": true,
+ "optional": true,
+ "os": [
+ "netbsd"
+ ],
+ "engines": {
+ "node": ">=12"
+ }
+ },
+ "node_modules/@esbuild/openbsd-x64": {
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+ "resolved": "https://registry.npmjs.org/@esbuild/openbsd-x64/-/openbsd-x64-0.21.5.tgz",
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+ "cpu": [
+ "x64"
+ ],
+ "dev": true,
+ "optional": true,
+ "os": [
+ "openbsd"
+ ],
+ "engines": {
+ "node": ">=12"
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+ "node_modules/@esbuild/sunos-x64": {
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+ "cpu": [
+ "x64"
+ ],
+ "dev": true,
+ "optional": true,
+ "os": [
+ "sunos"
+ ],
+ "engines": {
+ "node": ">=12"
+ }
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+ "dev": true,
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+ "dev": true,
+ "optional": true,
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+ "lightningcss": "^1.21.0",
+ "sass": "*",
+ "sass-embedded": "*",
+ "stylus": "*",
+ "sugarss": "*",
+ "terser": "^5.4.0"
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+ "peerDependenciesMeta": {
+ "@types/node": {
+ "optional": true
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+ "less": {
+ "optional": true
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+ "lightningcss": {
+ "optional": true
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+ "sass": {
+ "optional": true
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+ "sass-embedded": {
+ "optional": true
+ },
+ "stylus": {
+ "optional": true
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+ "sugarss": {
+ "optional": true
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+ "terser": {
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+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..b49205e
--- /dev/null
+++ b/package.json
@@ -0,0 +1,13 @@
+{
+ "scripts": {
+ "build": "tsc --build",
+ "dev": "vite demo",
+ "demo:build": "vite build demo",
+ "demo:preview": "pnpm demo:build && vite preview demo"
+ },
+ "devDependencies": {
+ "@types/node": "^20.12.7",
+ "typescript": "^5.0.0",
+ "vite": "^5.0.0"
+ }
+}
diff --git a/src/elements/main.css b/src/elements/main.css
new file mode 100644
index 0000000..464884c
--- /dev/null
+++ b/src/elements/main.css
@@ -0,0 +1,10 @@
+spatial-canvas {
+ display: block;
+ position: relative;
+}
+
+spatial-geometry {
+ display: block;
+ position: absolute;
+ cursor: pointer;
+}
diff --git a/src/elements/spatial-canvas.ts b/src/elements/spatial-canvas.ts
new file mode 100644
index 0000000..cb90d79
--- /dev/null
+++ b/src/elements/spatial-canvas.ts
@@ -0,0 +1,7 @@
+export class SpatialCanvas extends HTMLElement {
+ static tagName = 'spatial-canvas';
+
+ static register() {
+ customElements.define(this.tagName, this);
+ }
+}
diff --git a/src/elements/spatial-geometry.ts b/src/elements/spatial-geometry.ts
new file mode 100644
index 0000000..3056a1d
--- /dev/null
+++ b/src/elements/spatial-geometry.ts
@@ -0,0 +1,127 @@
+export type Shape = 'rectangle' | 'circle' | 'triangle';
+
+// Can we make adding new shapes extensible via a static property?
+const shapes = new Set(['rectangle', 'circle', 'triangle']);
+
+export type Vector = { x: number; y: number };
+
+// Should the move event bubble?
+export class MoveEvent extends CustomEvent {
+ constructor(vector: Vector) {
+ super('move', { detail: vector, bubbles: false });
+ }
+}
+
+// TODO: add z coordinate?
+export class SpatialGeometry extends HTMLElement {
+ static tagName = 'spatial-geometry';
+
+ static register() {
+ customElements.define(this.tagName, this);
+ }
+
+ static observedAttributes = ['type', 'x', 'y'];
+
+ constructor() {
+ super();
+
+ this.addEventListener('pointerdown', this);
+ this.addEventListener('lostpointercapture', this);
+ this.addEventListener('touchstart', this);
+ this.addEventListener('dragstart', this);
+ }
+
+ #type: Shape = 'rectangle';
+ get type(): Shape {
+ return this.#type;
+ }
+
+ set type(type: Shape) {
+ this.setAttribute('type', type);
+ }
+
+ #x = 0;
+ get x(): number {
+ return this.#x;
+ }
+
+ set x(x: number) {
+ this.setAttribute('x', x.toString());
+ }
+
+ #y = 0;
+ get y(): number {
+ return this.#y;
+ }
+
+ set y(y: number) {
+ this.setAttribute('y', y.toString());
+ }
+
+ attributeChangedCallback(name: string, _oldValue: string, newValue: string) {
+ if (name === 'x') {
+ this.#x = Number(newValue);
+ // In the future, when CSS `attr()` is supported we could define this x/y projection in CSS.
+ this.style.left = `${this.#x}px`;
+ this.#emitMoveEvent();
+ } else if (name === 'y') {
+ this.#y = Number(newValue);
+ this.style.top = `${this.#y}px`;
+ this.#emitMoveEvent();
+ } else if (name === 'type') {
+ if (shapes.has(newValue)) {
+ this.#type = newValue as Shape;
+ // TODO: Update shape styles. Ideally we could just use clip-path to style the shape.
+ // See https://www.smashingmagazine.com/2024/05/modern-guide-making-css-shapes/
+ }
+ }
+ }
+
+ // Similar to `Element.getClientBoundingRect()`, but returns an SVG path that precisely outlines the shape.
+ // We might also want some kind of utility function that maps a path into an approximate set of vertices.
+ getBoundingPath(): string {
+ return '';
+ }
+
+ handleEvent(event: PointerEvent) {
+ switch (event.type) {
+ case 'pointerdown': {
+ if (event.button !== 0 || event.ctrlKey) return;
+
+ this.addEventListener('pointermove', this);
+ this.setPointerCapture(event.pointerId);
+ this.style.userSelect = 'none';
+ return;
+ }
+ case 'pointermove': {
+ this.x += event.movementX;
+ this.y += event.movementY;
+ return;
+ }
+ case 'lostpointercapture': {
+ this.style.userSelect = '';
+ this.removeEventListener('pointermove', this);
+ return;
+ }
+ case 'touchstart':
+ case 'dragstart': {
+ event.preventDefault();
+ return;
+ }
+ }
+ }
+
+ #isMoveScheduled = false;
+
+ // Without some form of changes to x and y will cause separate events to be dispatched.
+ // Should we only emit a move event every animation frame or with something like `queueMicrotask`?
+ #emitMoveEvent() {
+ if (this.#isMoveScheduled) return;
+
+ this.#isMoveScheduled = true;
+ requestAnimationFrame(() => {
+ this.dispatchEvent(new MoveEvent({ x: this.#x, y: this.#y }));
+ this.#isMoveScheduled = false;
+ });
+ }
+}
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 0000000..2b7ec13
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,26 @@
+{
+ "compilerOptions": {
+ "target": "ESNext",
+ "useDefineForClassFields": false,
+ "module": "ESNext",
+ "lib": ["ESNext", "DOM", "DOM.Iterable"],
+ "skipLibCheck": true,
+
+ /* Bundler mode */
+ "moduleResolution": "bundler",
+ "resolveJsonModule": true,
+ "isolatedModules": true,
+ "declaration": true,
+
+ /* Linting */
+ "strict": true,
+ "noUnusedLocals": true,
+ "noUnusedParameters": true,
+ "noFallthroughCasesInSwitch": true,
+ "experimentalDecorators": true,
+
+ /* Transpile */
+ "outDir": "dist"
+ },
+ "include": ["src"]
+}