initial commit

init

.gitignore

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+# build output
+dist/
+# generated types
+.astro/
+
+# dependencies
+node_modules/
+
+# logs
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+
+
+# environment variables
+.env
+.env.production
+
+# macOS-specific files
+.DS_Store
+
+# jetbrains setting folder
+.idea/
+.tags

.prettierrc

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+{
+  "plugins": ["prettier-plugin-astro","prettier-plugin-svelte","prettier-plugin-tailwindcss"]
+}

.vscode/extensions.json

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+{
+  "recommendations": ["astro-build.astro-vscode"],
+  "unwantedRecommendations": []
+}

.vscode/launch.json

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+{
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "command": "./node_modules/.bin/astro dev",
+      "name": "Development server",
+      "request": "launch",
+      "type": "node-terminal"
+    }
+  ]
+}

Dockerfile

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+FROM alpine:3.20
+
+RUN apk add --no-cache g++ python3 python3-dev py3-aiohttp git
+
+RUN git clone --recursive https://github.com/vyv/psn-py.git
+WORKDIR /psn-py/vendors/pybind11
+# We need a newer version of pybind11 to compile agains python 3.12
+RUN git fetch --tags && git checkout v2.13.6
+WORKDIR /psn-py
+
+RUN g++ -O3 -Wall -shared -fPIC $(python3-config --includes) \
+-Ivendors/psn/include -Ivendors/pybind11/include src/main.cpp \
+-o psn$(python3-config --extension-suffix)
+
+COPY backend /backend
+WORKDIR /backend
+RUN cp /psn-py/psn$(python3-config --extension-suffix) .
+
+ENTRYPOINT ["python3", "psn_server.py"]

astro.config.mjs

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+// @ts-check
+// @ts-check
+import { defineConfig } from 'astro/config';
+
+import svelte from '@astrojs/svelte';
+
+import tailwind from '@astrojs/tailwind';
+
+// https://astro.build/config
+export default defineConfig({
+  integrations: [svelte(), tailwind()]
+});

backend/psn_server.py

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+import psn
+import time
+import socket
+import json
+from aiohttp import web
+import logging
+from dataclasses import dataclass, make_dataclass
+
+PSN_DEFAULT_UDP_PORT = 56565
+PSN_DEFAULT_UDP_MCAST_ADDRESS = "236.10.10.10"
+PORT = 8000
+IP = "0.0.0.0"
+NUM_TRACKERS = 3
+
+@dataclass
+class TrackerData:
+    id: int
+    x: float
+    y: float
+
+
+trackers = {}
+
+
+for i in NUM_TRACKERS:
+    trackers[i] = psn.Tracker(i, f"Tracker {i}")
+    trackers[i].set_pos(psn.Float3(0, 0, 0))
+
+def update_trackers(tracker_data_json: str):
+    global trackers
+    tracker_data = [TrackerData(**data) for data in json.loads(tracker_data_json)]
+
+    for tracker in tracker_data:
+        trackers[tracker.id].set_pos(psn.Float3(tracker.x, tracker.y, 0))
+
+def trackers_to_json():
+    return json.dumps([{"id": tracker.id, "x": tracker.pos.x, "y": tracker.pos.y} for tracker in trackers.values()])
+
+sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+
+def get_time_ms():
+    return int(time.time() * 1000)
+
+
+START_TIME = get_time_ms()
+
+
+def get_elapsed_time_ms():
+    return get_time_ms() - START_TIME
+
+
+def pic_to_scene_coords(x, y):
+    return x / 200, y / 200
+
+
+def send_positions():
+    encoder = psn.Encoder("Server 1")
+
+    packets = encoder.encode_data(trackers, get_elapsed_time_ms())
+    for packet in packets:
+        sock.sendto(packet, (PSN_DEFAULT_UDP_MCAST_ADDRESS, PSN_DEFAULT_UDP_PORT))
+
+
+async def handle_websocket(request):
+    ws = web.WebSocketResponse()
+    logging.debug("Websocket connection starting")
+    await ws.prepare(request)
+    logging.debug("Websocket connection ready")
+
+    ws.send_str(trackers_to_json())
+
+    try:
+        async for msg in ws:
+            logging.debug(f"Websocket data: {msg}")
+            if msg.type == web.WSMsgType.TEXT:
+                logging.debug("Received message: %s" % msg.data)
+                update_trackers(msg.data)
+                send_positions()
+
+            elif msg.type == web.WSMsgType.ERROR:
+                logging.error("ws connection closed with exception %s" % ws.exception())
+                print("ws connection closed with exception %s" % ws.exception())
+    except Exception as e:
+        logging.error(f"Websocket exception: {e}")
+
+    finally:
+        logging.debug("Websocket connection closing")
+        await ws.close()
+
+    return ws
+
+
+
+
+async def handle_root(request):
+    return web.FileResponse("./static/index.html")
+
+
+def create_app():
+    app = web.Application()
+    app.router.add_get("/", handle_root)
+    app.router.add_static("/", "./static")
+    app.router.add_get("/ws", handle_websocket)
+    return app
+
+
+if __name__ == "__main__":
+    logging.basicConfig(level=logging.DEBUG)
+    web.run_app(create_app(), host=IP, port=PORT)

docker-compose.yaml

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+services:
+  followspot-psn:
+    build: .
+    ports:
+      - "8000:8000"

package.json

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+{
+  "name": "",
+  "type": "module",
+  "version": "0.0.1",
+  "scripts": {
+    "dev": "astro dev",
+    "build": "astro check && astro build",
+    "preview": "astro preview",
+    "astro": "astro"
+  },
+  "dependencies": {
+    "@astrojs/check": "^0.9.4",
+    "@astrojs/svelte": "^6.0.2",
+    "@astrojs/tailwind": "^5.1.2",
+    "astro": "^4.16.16",
+    "svelte": "^5.2.12",
+    "tailwindcss": "^3.4.15",
+    "typescript": "^5.7.2"
+  },
+  "devDependencies": {
+    "prettier": "^3.4.1",
+    "prettier-plugin-astro": "^0.14.1",
+    "prettier-plugin-svelte": "^3.3.2",
+    "prettier-plugin-tailwindcss": "^0.6.9"
+  }
+}

public/favicon.svg

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+<svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 128 128">
+    <path d="M50.4 78.5a75.1 75.1 0 0 0-28.5 6.9l24.2-65.7c.7-2 1.9-3.2 3.4-3.2h29c1.5 0 2.7 1.2 3.4 3.2l24.2 65.7s-11.6-7-28.5-7L67 45.5c-.4-1.7-1.6-2.8-2.9-2.8-1.3 0-2.5 1.1-2.9 2.7L50.4 78.5Zm-1.1 28.2Zm-4.2-20.2c-2 6.6-.6 15.8 4.2 20.2a17.5 17.5 0 0 1 .2-.7 5.5 5.5 0 0 1 5.7-4.5c2.8.1 4.3 1.5 4.7 4.7.2 1.1.2 2.3.2 3.5v.4c0 2.7.7 5.2 2.2 7.4a13 13 0 0 0 5.7 4.9v-.3l-.2-.3c-1.8-5.6-.5-9.5 4.4-12.8l1.5-1a73 73 0 0 0 3.2-2.2 16 16 0 0 0 6.8-11.4c.3-2 .1-4-.6-6l-.8.6-1.6 1a37 37 0 0 1-22.4 2.7c-5-.7-9.7-2-13.2-6.2Z" />
+    <style>
+        path { fill: #000; }
+        @media (prefers-color-scheme: dark) {
+            path { fill: #FFF; }
+        }
+    </style>
+</svg>

src/components/Container.svelte

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+<script lang="ts">
+  import { onMount } from "svelte";
+  import type { TrackerData } from "../utils/types";
+  import Drag from "./Drag.svelte";
+
+  let ws: WebSocket | null = $state(null);
+
+  let trackers: TrackerData[] = $state([
+    { id: 1, x: 0, y: 0 },
+    { id: 2, x: 400, y: 40 },
+  ]);
+
+  onMount(() => {
+    ws = new WebSocket("/ws");
+    ws.onmessage = (event) => {
+      const data = JSON.parse(event.data);
+      trackers = data;
+    };
+  });
+</script>
+
+{#each trackers as tracker}
+  <Drag bind:id={tracker.id} bind:x={tracker.x} bind:y={tracker.y} {ws} />
+{/each}

src/components/Drag.svelte

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+<script lang="ts">
+  type Props = {
+    id: number;
+    x: number;
+    y: number;
+    ws: WebSocket | null;
+  };
+
+  let {
+    id = $bindable(),
+    x = $bindable(),
+    y = $bindable(),
+    ws = $bindable(),
+  }: Props = $props();
+
+  let element: HTMLElement;
+
+  let capturedPointerId: number | null = $state(null);
+
+  function onPointerDown(e: PointerEvent) {
+    element.setPointerCapture(e.pointerId);
+    capturedPointerId = e.pointerId;
+  }
+  function onPointerUp(e: PointerEvent) {
+    capturedPointerId = null;
+    element.releasePointerCapture(e.pointerId);
+  }
+  function onPointerMove(e: PointerEvent) {
+    if (capturedPointerId != e.pointerId) return;
+
+    e.preventDefault();
+    e.stopPropagation();
+
+    x += e.movementX;
+    y += e.movementY;
+
+    if (ws) {
+      ws.send(
+        JSON.stringify({
+          id,
+          x,
+          y,
+        }),
+      );
+    }
+  }
+</script>
+
+<div
+  bind:this={element}
+  onpointerdown={onPointerDown}
+  onpointerup={onPointerUp}
+  onpointermove={onPointerMove}
+  style={`transform: translate(${x}px, ${y}px)`}
+  class="absolute flex h-40 w-40 touch-none items-center justify-center rounded-full border-red-400 bg-red-400"
+>
+  dragable
+</div>

src/env.d.ts

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+/// <reference path="../.astro/types.d.ts" />

src/pages/index.astro

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+---
+import Container from "../components/Container.svelte";
+---
+
+<html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <link rel="icon" type="image/svg+xml" href="/favicon.svg" />
+    <meta name="generator" content={Astro.generator} />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
+    <title>Astro</title>
+  </head>
+  <body class="h-dvh w-screen">
+    <Container client:load />
+  </body>
+</html>

src/utils/types.ts

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+export interface TrackerData {
+  id: number;
+  x: number;
+  y: number;
+}

svelte.config.js

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+import { vitePreprocess } from '@astrojs/svelte';
+
+export default {
+	preprocess: vitePreprocess(),
+}

tailwind.config.mjs

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+/** @type {import('tailwindcss').Config} */
+export default {
+	content: ['./src/**/*.{astro,html,js,jsx,md,mdx,svelte,ts,tsx,vue}'],
+	theme: {
+		extend: {},
+	},
+	plugins: [],
+}

tsconfig.json

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+{
+  "extends": "astro/tsconfigs/strict",
+  "compilerOptions": {
+    // ...
+    "baseUrl": ".",
+    "paths": {
+      "$lib/*": ["./src/*"]
+    }
+  },
+  "include": [
+    ".astro/types.d.ts",
+    "**/*"
+  ],
+  "exclude": [
+    "dist"
+  ]
+}