Add Matrix effect: implement matrix animation with toggle functionality and responsive canvas

Jellyfin.Plugin.Seasonals/Web/matrix.js

@@ -0,0 +1,164 @@
+const config = window.SeasonalsPluginConfig?.Matrix || {};
+
+const enabled = config.EnableMatrix !== undefined ? config.EnableMatrix : true;
+const maxTrails = config.SymbolCount || 25; 
+const backgroundMode = config.EnableMatrixBackground !== undefined ? config.EnableMatrixBackground : false;
+const matrixChars = config.MatrixChars || '0123456789';
+
+let msgPrinted = false;
+let isHidden = false;
+
+// Toggle Function
+function toggleMatrix() {
+  const container = document.querySelector('.matrix-container');
+  if (!container) return;
+
+  const videoPlayer = document.querySelector('.videoPlayerContainer');
+  const trailerPlayer = document.querySelector('.youtubePlayerContainer');
+  const isDashboard = document.body.classList.contains('dashboardDocument');
+  const hasUserMenu = document.querySelector('#app-user-menu');
+
+  if (videoPlayer || trailerPlayer || isDashboard || hasUserMenu) {
+    if (!isHidden) {
+      container.style.display = 'none';
+      isHidden = true;
+      if (!msgPrinted) {
+        console.log('Matrix hidden');
+        msgPrinted = true;
+      }
+    }
+  } else {
+    if (isHidden) {
+      container.style.display = 'block';
+      isHidden = false;
+      if (msgPrinted) {
+        console.log('Matrix visible');
+        msgPrinted = false;
+      }
+    }
+  }
+}
+
+const observer = new MutationObserver(toggleMatrix);
+observer.observe(document.body, {
+  childList: true,
+  subtree: true,
+  attributes: true
+});
+
+function createElements() {
+  const container = document.querySelector('.matrix-container') || document.createElement('div');
+
+  if (!document.querySelector('.matrix-container')) {
+    container.className = 'matrix-container';
+    container.setAttribute('aria-hidden', 'true');
+    if (backgroundMode) container.style.zIndex = '5';
+    document.body.appendChild(container);
+  }
+
+  const canvas = document.createElement('canvas');
+  canvas.width = window.innerWidth;
+  canvas.height = window.innerHeight;
+  canvas.style.display = 'block';
+  container.appendChild(canvas);
+
+  const ctx = canvas.getContext('2d');
+//   const chars = '0123456789πABCDEFGHIJKLMNOPQRSTUVWXYZ'.split('');
+  const chars = matrixChars.split('');
+  const fontSize = 18;
+
+  class Trail {
+      constructor() {
+          this.reset();
+          this.y = Math.random() * -100; // Allow initial staggered start
+      }
+      reset() {
+          const cols = Math.floor(canvas.width / fontSize);
+          this.x = Math.floor(Math.random() * cols);
+          this.y = -Math.round(Math.random() * 20);
+          this.speed = 0.5 + Math.random() * 0.5;
+          this.len = 10 + Math.floor(Math.random() * 20);
+          this.chars = [];
+          for(let i=0; i<this.len; i++) {
+              this.chars.push(chars[Math.floor(Math.random() * chars.length)]);
+          }
+      }
+      update() {
+          const oldY = Math.floor(this.y);
+          this.y += this.speed;
+          const newY = Math.floor(this.y);
+
+          // If crossed a full vertical unit, push a new character and pop the old one to preserve screen positions
+          if (newY > oldY) {
+              this.chars.unshift(chars[Math.floor(Math.random() * chars.length)]);
+              this.chars.pop();
+          }
+
+          // Randomly mutate some characters (heads mutate faster)
+          for (let i = 0; i < this.len; i++) {
+              const chance = i < 3 ? 0.90 : 0.98;
+              if (Math.random() > chance) {
+                  this.chars[i] = chars[Math.floor(Math.random() * chars.length)];
+              }
+          }
+          if (this.y - this.len > Math.ceil(canvas.height / fontSize)) {
+              this.reset();
+          }
+      }
+      draw(ctx) {
+          const headY = Math.floor(this.y);
+          for (let i = 0; i < this.len; i++) {
+              const charY = headY - i;
+              if (charY < 0 || charY * fontSize > canvas.height + fontSize) continue;
+              
+              const ratio = i / this.len;
+              const alpha = 1 - ratio;
+
+              if (i === 0) {
+                  ctx.fillStyle = `rgba(255, 255, 255, ${alpha})`;
+                  ctx.shadowBlur = 8;
+                  ctx.shadowColor = '#0F0';
+              } else if (i === 1) {
+                  ctx.fillStyle = `rgba(150, 255, 150, ${alpha})`;
+                  ctx.shadowBlur = 4;
+                  ctx.shadowColor = '#0F0';
+              } else {
+                  ctx.fillStyle = `rgba(0, 255, 0, ${alpha * 0.8})`;
+                  ctx.shadowBlur = 0;
+              }
+              
+              ctx.fillText(this.chars[i], this.x * fontSize + fontSize/2, charY * fontSize);
+          }
+      }
+  }
+
+  const trails = [];
+  for(let i=0; i<maxTrails; i++) trails.push(new Trail());
+
+  function loop() {
+      if (isHidden) return; // Pause drawing when hidden
+      ctx.clearRect(0, 0, canvas.width, canvas.height);
+      ctx.font = 'bold ' + fontSize + 'px monospace';
+      ctx.textAlign = 'center';
+      for (const t of trails) {
+          t.update();
+          t.draw(ctx);
+      }
+  }
+
+  if (window.matrixInterval) clearInterval(window.matrixInterval);
+  window.matrixInterval = setInterval(loop, 50);
+
+  window.addEventListener('resize', () => {
+      canvas.width = window.innerWidth;
+      canvas.height = window.innerHeight;
+  });
+}
+
+function initializeMatrix() {
+  if (!enabled) return;
+  createElements();
+  toggleMatrix();
+}
+
+initializeMatrix();