From 44b66c37fc6fe3bf0a7ef68a42410b25aba9e98a Mon Sep 17 00:00:00 2001
From: Vinzenz Schroeter <vinzenz.f.s@gmail.com>
Date: Sun, 14 Apr 2024 13:23:04 +0200
Subject: [PATCH] random color on launch, dynamic map color

---
 tank-frontend/src/ClientScreen.tsx | 18 ++++++++++++++----
 tank-frontend/src/index.tsx        | 16 ++++++++++++++++
 2 files changed, 30 insertions(+), 4 deletions(-)

diff --git a/tank-frontend/src/ClientScreen.tsx b/tank-frontend/src/ClientScreen.tsx
index 589a1e3..9e774a7 100644
--- a/tank-frontend/src/ClientScreen.tsx
+++ b/tank-frontend/src/ClientScreen.tsx
@@ -5,9 +5,6 @@ import './ClientScreen.css';
 const pixelsPerRow = 352;
 const pixelsPerCol = 160;
 
-const onColor = [0, 180, 0, 255];
-const offColor = [0, 0, 0, 255];
-
 function getIndexes(bitIndex: number) {
     return {
         byteIndex: Math.floor(bitIndex / 8),
@@ -15,11 +12,24 @@ function getIndexes(bitIndex: number) {
     };
 }
 
+// @ts-ignore
+const rootElement = document.querySelector(':root')!;
+
+function normalizeColor(context: CanvasRenderingContext2D, color: string) {
+    context.fillStyle = color;
+    context.fillRect(0, 0, 1, 1);
+    return context.getImageData(0, 0, 1, 1).data;
+}
+
 function drawPixelsToCanvas(pixels: Uint8Array, canvas: HTMLCanvasElement) {
     const drawContext = canvas.getContext('2d');
     if (!drawContext)
         throw new Error('could not get draw context');
 
+    const rootStyle = getComputedStyle(rootElement);
+    const colorPrimary = normalizeColor(drawContext, rootStyle.getPropertyValue('--color-primary'));
+    const colorBackground = normalizeColor(drawContext, rootStyle.getPropertyValue('--color-background'));
+
     const imageData = drawContext.getImageData(0, 0, canvas.width, canvas.height, {colorSpace: 'srgb'});
     const data = imageData.data;
 
@@ -30,7 +40,7 @@ function drawPixelsToCanvas(pixels: Uint8Array, canvas: HTMLCanvasElement) {
             const {byteIndex, bitInByteIndex} = getIndexes(pixelIndex);
             const mask = (1 << bitInByteIndex);
             const isOn = (pixels[byteIndex] & mask) !== 0;
-            const color = isOn ? onColor : offColor;
+            const color = isOn ? colorPrimary : colorBackground;
 
             for (let colorChannel of [0, 1, 2, 3])
                 data[pixelIndex * 4 + colorChannel] = color[colorChannel];
diff --git a/tank-frontend/src/index.tsx b/tank-frontend/src/index.tsx
index 07bbf93..cde0723 100644
--- a/tank-frontend/src/index.tsx
+++ b/tank-frontend/src/index.tsx
@@ -3,6 +3,22 @@ import {createRoot} from 'react-dom/client';
 import './index.css';
 import App from "./App.tsx";
 
+function getRandomColor() {
+    const letters = '0123456789ABCDEF';
+    let color = '#';
+    for (let i = 0; i < 3; i++) {
+        color += letters[Math.floor(Math.random() * letters.length)];
+    }
+    return color;
+}
+
+// @ts-ignore
+const rootStyle = document.querySelector(':root')?.style;
+if (rootStyle) {
+    rootStyle.setProperty('--color-primary', getRandomColor());
+    rootStyle.setProperty('--color-secondary', getRandomColor());
+    rootStyle.setProperty('--color-background', getRandomColor());
+}
 
 createRoot(document.getElementById('root')!).render(
     <React.StrictMode>