From 6acec7ebb977893f2334e0e5d06d48e0d54ecb52 Mon Sep 17 00:00:00 2001
From: Mads Hermansen <119772939+madshermansen@users.noreply.github.com>
Date: Tue, 2 Apr 2024 16:11:50 +0200
Subject: [PATCH] Create star background function and implement on pages (#174)

* feat(frontend): :sparkles: add star background to pages

added to most backgrounds except globe and blog (because of potential merge issues)

* fix

---------

Co-authored-by: Lukas <lukas@thrane.name>
---
 frontend/src/app/layout.tsx                   |   6 +-
 frontend/src/app/satellites/page.tsx          |   1 +
 .../components/starBackground/Starfield.tsx   | 167 ++++++++++++++++++
 3 files changed, 173 insertions(+), 1 deletion(-)
 create mode 100644 frontend/src/components/starBackground/Starfield.tsx

diff --git a/frontend/src/app/layout.tsx b/frontend/src/app/layout.tsx
index fde7398..d05ed9c 100644
--- a/frontend/src/app/layout.tsx
+++ b/frontend/src/app/layout.tsx
@@ -15,6 +15,7 @@ export const metadata: Metadata = {
 };
 
 import ErrorBoundaryNavigation from "@/components/ErrorBoundaryNavigation";
+import Starfield from "@/components/starBackground/Starfield";
 
 export default function RootLayout({
     children,
@@ -27,7 +28,10 @@ export default function RootLayout({
                 <ApolloWrapper>
                     <Navbar />
                     <ErrorBoundaryNavigation>
-                        <main className="flex-grow">{children}</main>
+                        <main className="flex-grow">
+                            <Starfield />
+                            {children}
+                        </main>
                     </ErrorBoundaryNavigation>
                     <Footer />
                 </ApolloWrapper>
diff --git a/frontend/src/app/satellites/page.tsx b/frontend/src/app/satellites/page.tsx
index 01809c0..084665f 100644
--- a/frontend/src/app/satellites/page.tsx
+++ b/frontend/src/app/satellites/page.tsx
@@ -5,6 +5,7 @@ import Link from "next/link";
 import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
 import SatelliteStatsTable from "@/components/ui/satelliteStatsTable";
 import Image from "next/image";
+
 const HOST_URL = process.env.HOST_URL;
 const GET_SATELLITES = gql(`
 query GET_SATELLITES {
diff --git a/frontend/src/components/starBackground/Starfield.tsx b/frontend/src/components/starBackground/Starfield.tsx
new file mode 100644
index 0000000..c7fa3fa
--- /dev/null
+++ b/frontend/src/components/starBackground/Starfield.tsx
@@ -0,0 +1,167 @@
+"use client";
+
+import React, { useEffect } from "react";
+
+interface Props {
+    speedFactor?: number;
+    backgroundColor?: string;
+    starColor?: [number, number, number];
+    starCount?: number;
+}
+
+export default function Starfield(props: Props) {
+    const {
+        speedFactor = 0.05,
+        backgroundColor = "black",
+        starColor = [255, 255, 255],
+        starCount = 5000,
+    } = props;
+
+    useEffect(() => {
+        const canvas = document.getElementById(
+            "starfield",
+        ) as HTMLCanvasElement;
+
+        if (canvas) {
+            const c = canvas.getContext("2d");
+
+            if (c) {
+                let w = window.innerWidth;
+                let h = window.innerHeight;
+
+                const setCanvasExtents = () => {
+                    canvas.width = w;
+                    canvas.height = h;
+                };
+
+                setCanvasExtents();
+
+                window.onresize = () => {
+                    setCanvasExtents();
+                };
+
+                const makeStars = (count: number) => {
+                    const out = [];
+                    for (let i = 0; i < count; i++) {
+                        const s = {
+                            x: Math.random() * 1600 - 800,
+                            y: Math.random() * 900 - 450,
+                            z: Math.random() * 1000,
+                        };
+                        out.push(s);
+                    }
+                    return out;
+                };
+
+                let stars = makeStars(starCount);
+
+                const clear = () => {
+                    c.fillStyle = backgroundColor;
+                    c.fillRect(0, 0, canvas.width, canvas.height);
+                };
+
+                const putPixel = (x: number, y: number, brightness: number) => {
+                    const rgb =
+                        "rgba(" +
+                        starColor[0] +
+                        "," +
+                        starColor[1] +
+                        "," +
+                        starColor[2] +
+                        "," +
+                        brightness +
+                        ")";
+                    c.fillStyle = rgb;
+                    c.fillRect(x, y, 1, 1);
+                };
+
+                const moveStars = (distance: number) => {
+                    const count = stars.length;
+                    for (var i = 0; i < count; i++) {
+                        const s = stars[i];
+                        s.z -= distance;
+                        while (s.z <= 1) {
+                            s.z += 1000;
+                        }
+                    }
+                };
+
+                let prevTime: number;
+                const init = (time: number) => {
+                    prevTime = time;
+                    requestAnimationFrame(tick);
+                };
+
+                const tick = (time: number) => {
+                    let elapsed = time - prevTime;
+                    prevTime = time;
+
+                    moveStars(elapsed * speedFactor);
+
+                    clear();
+
+                    const cx = w / 2;
+                    const cy = h / 2;
+
+                    const count = stars.length;
+                    for (var i = 0; i < count; i++) {
+                        const star = stars[i];
+
+                        const x = cx + star.x / (star.z * 0.001);
+                        const y = cy + star.y / (star.z * 0.001);
+
+                        if (x < 0 || x >= w || y < 0 || y >= h) {
+                            continue;
+                        }
+
+                        const d = star.z / 1000.0;
+                        const b = 1 - d * d;
+
+                        putPixel(x, y, b);
+                    }
+
+                    requestAnimationFrame(tick);
+                };
+
+                requestAnimationFrame(init);
+
+                // add window resize listener:
+                window.addEventListener("resize", function () {
+                    w = window.innerWidth;
+                    h = window.innerHeight;
+                    setCanvasExtents();
+                });
+            } else {
+                console.error("Could not get 2d context from canvas element");
+            }
+        } else {
+            console.error('Could not find canvas element with id "starfield"');
+        }
+
+        return () => {
+            window.onresize = null;
+        };
+    }, [starColor, backgroundColor, speedFactor, starCount]);
+
+    return (
+        <canvas
+            id="starfield"
+            style={{
+                padding: 0,
+                margin: 0,
+                position: "fixed",
+                top: 0,
+                right: 0,
+                bottom: 0,
+                left: 0,
+                zIndex: -1,
+                opacity: 1,
+                pointerEvents: "none",
+                mixBlendMode: "screen",
+            }}
+        ></canvas>
+    );
+}
+
+// https://github.com/designly1/react-starfield
+// MIT License