BolkeDerBaer
038910e9f0
- Implemented a service worker (sw.js) to handle push notifications with dynamic options and notification click events. - Created a calendar layout in test.html with a grid system for displaying events across days and times. - Developed a visually engaging WLAN QR code page (wlan.html) with animated backgrounds, particle effects, and tips for connecting to the network.
264 lines
8.5 KiB
HTML
264 lines
8.5 KiB
HTML
<!DOCTYPE html>
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<html lang="de">
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<head>
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<meta charset="UTF-8">
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<title>Bild skalieren & anzeigen</title>
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<style>
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/* Canvas sichtbar skalieren */
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#outputCanvas {
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width: 33%;
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/* Bildschirmbreite */
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height: auto;
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/* Höhe automatisch */
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border: 1px solid black;
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image-rendering: pixelated;
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/* WICHTIG: Pixel bleiben scharf */
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}
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</style>
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</head>
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<body>
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<h2>Bild auswählen, skalieren und im Canvas anzeigen</h2>
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<label>Breite: </label>
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<input type="number" id="newWidth" value="8"><br>
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<label>Höhe: </label>
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<input type="number" id="newHeight" value="8"><br><br>
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<button onclick="myFunction()">Copy text</button>
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<script>
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function myFunction() {
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// Copy the text inside the text field
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navigator.clipboard.writeText(AnimationData.getPy());
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}
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</script>
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<input type="file" id="imageInput" accept="image/*,video/*"><br><br>
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<!-- Canvas zur Anzeige -->
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<canvas id="outputCanvas"></canvas>
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<script>
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// Pixel-Klasse
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class Pixel {
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constructor(x, y, r, g, b, a) {
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this.x = x;
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this.y = y;
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this.r = r;
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this.g = g;
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this.b = b;
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this.a = a;
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}
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}
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class Frame {
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constructor(file) {
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this.file = URL.createObjectURL(file);
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this.pixels = [];
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this.updateSize(8, 8);
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}
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updateSize(w, h) {
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const img = new Image();
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img.onload = () => {
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const canvas = document.createElement("canvas");
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const ctx = canvas.getContext("2d");
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// Interne Pixelgröße des Canvas (NICHT sichtbare Größe)
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canvas.width = w;
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canvas.height = h;
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// Bild intern auf dieser Pixelgröße zeichnen
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ctx.drawImage(img, 0, 0, w, h);
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// Pixel auslesen
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const imageData = ctx.getImageData(0, 0, w, h);
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const data = imageData.data;
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this.pixels = [];
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for (let y = 0; y < h; y++) {
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for (let x = 0; x < w; x++) {
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const i = (y * w + x) * 4;
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this.pixels.push(new Pixel(x, y, data[i], data[i + 1], data[i + 2], data[i + 3]));
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}
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}
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};
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img.src = this.file;
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}
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}
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class Animation {
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constructor(frames, fps = 1) {
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this.frames = frames;
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this.fps = fps;
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this.currentFrameIndex = 0;
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}
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updateSize(w, h) {
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this.frames.forEach(f => f.updateSize(w, h));
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}
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getPy() {
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let string = "";
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this.frames.forEach((frame, index) => {
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string += `frame${index} = [`;
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frame.pixels.forEach((pixel, i) => {
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const prevPixel = index > 0 ? this.frames[index - 1].pixels[i] : null;
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if (!prevPixel || prevPixel.r !== pixel.r || prevPixel.g !== pixel.g || prevPixel.b !== pixel.b || prevPixel.a !== pixel.a) {
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string += `(${i}, ${pixel.r}, ${pixel.g}, ${pixel.b}, ${pixel.a}),`;
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}
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});
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string += "]\n";
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});
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string += "\nFRAMES = [\n";
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this.frames.forEach((frame, index) => {
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string += ` frame${index},\n`;
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});
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return string;
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}
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getFrame() {
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return this.frames[this.currentFrameIndex];
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}
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nextFrame() {
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this.currentFrameIndex = (this.currentFrameIndex + 1) % this.frames.length;
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}
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}
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let AnimationData = new Animation([]);
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document.getElementById("imageInput").addEventListener("change", function (event) {
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const file = event.target.files[0];
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if (!file) return;
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if (file.type.startsWith("image/")) {
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AnimationData = new Animation([new Frame(file)], 10);
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AnimationData.frames[0].updateSize(
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parseInt(document.getElementById("newWidth").value),
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parseInt(document.getElementById("newHeight").value)
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);
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requestAnimationFrame(loop);
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}
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if (file.type.startsWith("video/")) {
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let targetFPS = 24;
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let frames = videoDecoder(file, targetFPS);
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AnimationData = new Animation(frames, targetFPS);
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setTimeout(() => {
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requestAnimationFrame(loop);
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}, 10000);
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}
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});
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let accumulator = 0;
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let lastTime = 0;
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function videoDecoder(file, fps) {
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let video = document.createElement("video");
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const canvas = document.createElement('canvas');
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const ctx = canvas.getContext('2d');
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let frames = [];
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function seek(videoEl, time) {
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return new Promise((resolve, reject) => {
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function cleanup() {
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videoEl.removeEventListener('seeked', onSeeked);
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videoEl.removeEventListener('error', onError);
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}
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function onSeeked() { cleanup(); resolve(); }
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function onError(e) { cleanup(); reject(e); }
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videoEl.addEventListener('seeked', onSeeked);
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videoEl.addEventListener('error', onError);
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videoEl.currentTime = Math.min(Math.max(time, 0), videoEl.duration || time);
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});
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}
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video.addEventListener('loadeddata', async () => {
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canvas.width = video.videoWidth || 640;
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canvas.height = video.videoHeight || 360;
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let delta = 1 / fps;
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let currentTime = 0;
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for (let currentTime = 0; currentTime < video.duration; currentTime += delta) {
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await seek(video, currentTime);
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ctx.drawImage(video, 0, 0, canvas.width, canvas.height);
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const imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);
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const data = imageData.data;
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canvas.toBlob(blob => {
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if (!blob) return;
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const url = URL.createObjectURL(blob);
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let frame = new Frame(blob);
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document.body.appendChild(document.createTextNode(`Frame at ${currentTime.toFixed(2)}s`));
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let img = document.createElement("img");
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img.src = url;
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//document.body.appendChild(img);
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document.body.appendChild(document.createElement("br"));
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frames.push(frame);
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}, 'image/png');
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}
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});
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video.src = URL.createObjectURL(file);
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video.load();
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return frames;
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}
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function loop(time) {
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const deltaTime = (time - lastTime) / 1000; // in seconds
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lastTime = time;
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accumulator += deltaTime;
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const FRAME_TIME = 1 / AnimationData.fps; // ~0.0167 seconds for 60 FPS
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// Generate frames only when enough time has passed
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if (accumulator >= FRAME_TIME) {
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const canvas = document.getElementById("outputCanvas");
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const ctx = canvas.getContext("2d");
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const frame = AnimationData.getFrame();
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AnimationData.nextFrame();
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canvas.width = frame.pixels.reduce((max, p) => Math.max(max, p.x), 0) + 1;
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canvas.height = frame.pixels.reduce((max, p) => Math.max(max, p.y), 0) + 1;
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for (const pixel of frame.pixels) {
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ctx.fillStyle = `rgba(${pixel.r}, ${pixel.g}, ${pixel.b}, ${pixel.a / 255})`;
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ctx.fillRect(pixel.x, pixel.y, 1, 1);
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}
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accumulator -= FRAME_TIME;
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}
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requestAnimationFrame(loop);
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}
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</script>
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</body>
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</html> |