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start working on spatial-geometry elements, scaffold demo

This commit is contained in:
“chrisshank” 2024-08-17 15:13:49 -07:00
parent c23fd2cfcb
commit cc0618feda
10 changed files with 1095 additions and 0 deletions
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.gitignore vendored Normal file
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node_modules
dist

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demo/index.html Normal file
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Spatial Canvas Primitives</title>
<style>
html {
height: 100%;
}
body {
min-height: 100%;
position: relative;
}
</style>
</head>
<body>
<h1>Spatial Canvas Primitives</h1>
<ul>
<li><a href="/shapes">Shapes</a></li>
</ul>
</body>
</html>

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demo/shapes.html Normal file
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Shapes</title>
<style>
@import url('../src/elements/main.css');
html {
height: 100%;
}
body {
min-height: 100%;
position: relative;
margin: 0;
}
spatial-geometry {
border: 2px solid black;
}
</style>
</head>
<body>
<spatial-geometry x="100" y="100">Shape with some text</spatial-geometry>
<script type="module">
import { SpatialGeometry } from '../src/elements/spatial-geometry.ts';
SpatialGeometry.register();
</script>
</body>
</html>

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demo/vite.config.ts Normal file
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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<string, string>),
},
modulePreload: {
polyfill: false,
},
},
});

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13
package.json Normal file
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@ -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"
}
}

10
src/elements/main.css Normal file
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@ -0,0 +1,10 @@
spatial-canvas {
display: block;
position: relative;
}
spatial-geometry {
display: block;
position: absolute;
cursor: pointer;
}

7
src/elements/spatial-canvas.ts Normal file
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@ -0,0 +1,7 @@
export class SpatialCanvas extends HTMLElement {
static tagName = 'spatial-canvas';
static register() {
customElements.define(this.tagName, this);
}
}

127
src/elements/spatial-geometry.ts Normal file
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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<Vector> {
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;
});
}
}

26
tsconfig.json Normal file
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@ -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"]
}