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sheet-animation.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Sprite Sheet Animation Viewer & GIF Exporter</title>
<style>
body {
background-color: #222;
color: #fff;
font-family: Arial, sans-serif;
margin: 0;
padding: 20px;
text-align: center;
}
.container {
display: flex;
flex-direction: column;
align-items: center;
max-width: 800px;
margin: 0 auto;
}
.preview-container {
background-image:
linear-gradient(45deg, #333 25%, transparent 25%),
linear-gradient(-45deg, #333 25%, transparent 25%),
linear-gradient(45deg, transparent 75%, #333 75%),
linear-gradient(-45deg, transparent 75%, #333 75%);
background-size: 20px 20px;
background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
border: 1px solid #444;
border-radius: 5px;
margin: 20px 0;
padding: 20px;
}
#animation-canvas {
image-rendering: pixelated;
image-rendering: crisp-edges;
max-width: 100%;
}
.controls {
display: flex;
flex-wrap: wrap;
gap: 10px;
justify-content: center;
margin-bottom: 20px;
}
button {
background-color: #3498db;
border: none;
border-radius: 4px;
color: white;
cursor: pointer;
padding: 8px 16px;
}
button:hover {
background-color: #2980b9;
}
button:disabled {
background-color: #777;
cursor: not-allowed;
}
.speed-control {
display: flex;
align-items: center;
gap: 8px;
margin-top: 10px;
}
input[type="range"] {
width: 150px;
}
.info-panel {
background-color: rgba(0, 0, 0, 0.5);
border-radius: 5px;
padding: 15px;
margin-top: 20px;
text-align: left;
width: 100%;
}
.info-row {
display: flex;
justify-content: space-between;
margin-bottom: 5px;
font-size: 14px;
}
.info-label {
color: #aaa;
}
.info-value {
color: #4fc3f7;
font-family: monospace;
}
h1 {
color: #3498db;
margin-bottom: 10px;
}
.zoom-control {
margin-top: 10px;
display: flex;
align-items: center;
gap: 8px;
}
.zoom-btn {
background-color: #555;
font-size: 18px;
width: 30px;
}
.export-panel {
margin-top: 20px;
background-color: rgba(0, 0, 0, 0.5);
border-radius: 5px;
padding: 15px;
}
.export-options {
display: flex;
flex-wrap: wrap;
gap: 10px;
margin-top: 10px;
}
.export-options label {
display: flex;
align-items: center;
margin-right: 15px;
color: #ddd;
font-size: 14px;
}
.export-options input {
margin-right: 5px;
}
#export-btn {
background-color: #e74c3c;
margin-top: 10px;
}
#export-btn:hover {
background-color: #c0392b;
}
.progress-container {
margin-top: 10px;
background-color: #222;
border-radius: 4px;
height: 8px;
overflow: hidden;
}
.progress-bar {
height: 100%;
width: 0%;
background-color: #2ecc71;
transition: width 0.2s;
}
#export-status {
font-size: 12px;
color: #aaa;
margin-top: 5px;
}
.gif-output {
margin-top: 15px;
border: 1px solid #444;
padding: 10px;
text-align: center;
display: none;
}
#gif-preview {
max-width: 100%;
max-height: 300px;
margin-bottom: 10px;
}
.download-btn {
background-color: #27ae60;
}
</style>
<!-- Include gif.js library for GIF generation -->
<script src="https://cdn.jsdelivr.net/gh/jnordberg/gif.js@0.2.0/dist/gif.js"></script>
</head>
<body>
<div class="container">
<h1>Sprite Sheet Animation Viewer & GIF Exporter</h1>
<div class="controls">
<button id="play-btn">▶️ Play</button>
<button id="pause-btn" disabled>⏸️ Pause</button>
<div class="upload-controls" style="margin: 10px 0;">
<input type="file" id="sprite-upload" accept=".png" style="display: none;">
<input type="file" id="json-upload" accept=".json" style="display: none;">
<button id="upload-btn" style="background-color: #27ae60;">📂 Upload Files</button>
<div style="font-size: 12px; color: #aaa; margin-top: 5px;">
<span id="sprite-filename">No sprite sheet selected</span><br>
<span id="json-filename">No JSON metadata selected</span>
</div>
</div>
</div>
<div class="speed-control">
<span>Speed:</span>
<input type="range" id="speed-slider" min="1" max="60" value="24">
<span id="speed-value">24 FPS</span>
</div>
<div class="preview-container">
<canvas id="animation-canvas" width="256" height="256"></canvas>
</div>
<div class="zoom-control">
<button class="zoom-btn" id="zoom-out">-</button>
<span id="zoom-level">1x</span>
<button class="zoom-btn" id="zoom-in">+</button>
</div>
<div class="export-panel">
<h3>Export Animation as GIF</h3>
<div class="export-options">
<label>
<input type="checkbox" id="export-loop" checked>
Loop animation
</label>
<label>
<input type="number" id="export-fps" value="24" min="1" max="60" style="width: 40px;">
FPS
</label>
<label>
<input type="number" id="export-scale" value="1" min="0.1" max="2" step="0.1" style="width: 40px;">
Scale
</label>
<label>
<input type="number" id="export-quality" value="10" min="1" max="20" style="width: 40px;">
Quality
</label>
</div>
<button id="export-btn">Generate GIF</button>
<div class="progress-container">
<div class="progress-bar" id="export-progress"></div>
</div>
<div id="export-status">Ready to export</div>
<div class="gif-output">
<img id="gif-preview" alt="GIF Preview">
<button id="download-gif-btn" class="download-btn">Download GIF</button>
</div>
</div>
<div class="info-panel">
<div class="info-row">
<span class="info-label">Animation Name:</span>
<span class="info-value" id="animation-name">-</span>
</div>
<div class="info-row">
<span class="info-label">Frame Size:</span>
<span class="info-value" id="frame-size">-</span>
</div>
<div class="info-row">
<span class="info-label">Total Frames:</span>
<span class="info-value" id="total-frames">-</span>
</div>
<div class="info-row">
<span class="info-label">Layout:</span>
<span class="info-value" id="layout-info">-</span>
</div>
<div class="info-row">
<span class="info-label">Current Frame:</span>
<span class="info-value" id="current-frame">0 / 0</span>
</div>
</div>
</div>
<script>
class SpriteSheetPlayer {
constructor(canvasId) {
this.canvas = document.getElementById(canvasId);
this.ctx = this.canvas.getContext('2d');
this.spriteSheet = null;
this.metadata = null;
this.currentFrame = 0;
this.isPlaying = false;
this.fps = 24;
this.lastFrameTime = 0;
this.animationId = null;
this.zoom = 1;
// Set up default size
this.resizeCanvas(256, 256);
}
async loadSpriteSheet(imageUrl, jsonUrl) {
try {
// Load and parse the JSON metadata
const response = await fetch(jsonUrl);
if (!response.ok) {
throw new Error(`Failed to load metadata: ${response.status} ${response.statusText}`);
}
this.metadata = await response.json();
// Load the sprite sheet image
return new Promise((resolve, reject) => {
this.spriteSheet = new Image();
this.spriteSheet.onload = () => {
this.updateInfoPanel();
this.resizeCanvas(
this.metadata.frameWidth * this.zoom,
this.metadata.frameHeight * this.zoom
);
this.drawFrame(0);
resolve();
};
this.spriteSheet.onerror = () => {
reject(new Error("Failed to load sprite sheet image"));
};
this.spriteSheet.src = imageUrl;
});
} catch (error) {
console.error("Error loading sprite sheet:", error);
alert(`Error: ${error.message}`);
throw error;
}
}
async loadFromFiles(imageFile, jsonFile) {
try {
// Load and parse the JSON metadata
const jsonText = await jsonFile.text();
this.metadata = JSON.parse(jsonText);
// Load the sprite sheet image
return new Promise((resolve, reject) => {
const reader = new FileReader();
reader.onload = (e) => {
this.spriteSheet = new Image();
this.spriteSheet.onload = () => {
this.updateInfoPanel();
this.resizeCanvas(
this.metadata.frameWidth * this.zoom,
this.metadata.frameHeight * this.zoom
);
this.drawFrame(0);
resolve();
};
this.spriteSheet.onerror = () => {
reject(new Error("Failed to load sprite sheet image"));
};
this.spriteSheet.src = e.target.result;
};
reader.onerror = () => reject(new Error("Failed to read image file"));
reader.readAsDataURL(imageFile);
});
} catch (error) {
console.error("Error loading sprite sheet:", error);
alert(`Error: ${error.message}`);
throw error;
}
}
updateInfoPanel() {
if (!this.metadata) return;
document.getElementById('animation-name').textContent = this.metadata.animationName || "Unknown";
document.getElementById('frame-size').textContent =
`${this.metadata.frameWidth}x${this.metadata.frameHeight}px`;
document.getElementById('total-frames').textContent = this.metadata.frames || "Unknown";
document.getElementById('layout-info').textContent =
`${this.metadata.columns} cols x ${this.metadata.rows} rows`;
}
resizeCanvas(width, height) {
this.canvas.width = width;
this.canvas.height = height;
// Clear with transparent background
this.ctx.clearRect(0, 0, width, height);
}
drawFrame(frameIndex) {
if (!this.spriteSheet || !this.metadata) return;
this.currentFrame = frameIndex % this.metadata.frames;
// Calculate source rectangle from sprite sheet
const col = this.currentFrame % this.metadata.columns;
const row = Math.floor(this.currentFrame / this.metadata.columns);
const sourceX = col * this.metadata.frameWidth;
const sourceY = row * this.metadata.frameHeight;
// Clear canvas with transparent background
this.ctx.clearRect(0, 0, this.canvas.width, this.canvas.height);
// Draw the frame with proper scaling
this.ctx.drawImage(
this.spriteSheet,
sourceX, sourceY, this.metadata.frameWidth, this.metadata.frameHeight,
0, 0, this.canvas.width, this.canvas.height
);
// Update frame counter in UI
document.getElementById('current-frame').textContent =
`${this.currentFrame + 1} / ${this.metadata.frames}`;
}
play() {
if (!this.spriteSheet) return;
this.isPlaying = true;
this.lastFrameTime = 0;
this.animate();
// Update UI
document.getElementById('play-btn').disabled = true;
document.getElementById('pause-btn').disabled = false;
}
pause() {
this.isPlaying = false;
if (this.animationId) {
cancelAnimationFrame(this.animationId);
}
// Update UI
document.getElementById('play-btn').disabled = false;
document.getElementById('pause-btn').disabled = true;
}
animate(timestamp) {
if (!this.isPlaying) return;
if (!this.lastFrameTime) this.lastFrameTime = timestamp;
const elapsed = timestamp - this.lastFrameTime;
const frameInterval = 1000 / this.fps;
if (elapsed >= frameInterval) {
// Move to next frame
this.drawFrame(this.currentFrame + 1);
this.lastFrameTime = timestamp;
}
this.animationId = requestAnimationFrame(this.animate.bind(this));
}
setFPS(fps) {
this.fps = fps;
}
setZoom(zoomLevel) {
this.zoom = Math.max(0.25, Math.min(8, zoomLevel));
document.getElementById('zoom-level').textContent = `${this.zoom}x`;
if (this.metadata) {
this.resizeCanvas(
this.metadata.frameWidth * this.zoom,
this.metadata.frameHeight * this.zoom
);
this.drawFrame(this.currentFrame);
}
}
// Add methods for GIF export
getFrameForExport(frameIndex) {
if (!this.spriteSheet || !this.metadata) return null;
const tmpCanvas = document.createElement('canvas');
const tmpCtx = tmpCanvas.getContext('2d');
// Set the canvas to the frame size
tmpCanvas.width = this.metadata.frameWidth;
tmpCanvas.height = this.metadata.frameHeight;
// Draw the specified frame
const col = frameIndex % this.metadata.columns;
const row = Math.floor(frameIndex / this.metadata.columns);
const sourceX = col * this.metadata.frameWidth;
const sourceY = row * this.metadata.frameHeight;
tmpCtx.clearRect(0, 0, tmpCanvas.width, tmpCanvas.height);
tmpCtx.drawImage(
this.spriteSheet,
sourceX, sourceY, this.metadata.frameWidth, this.metadata.frameHeight,
0, 0, tmpCanvas.width, tmpCanvas.height
);
return tmpCanvas;
}
exportToGIF(options = {}) {
if (!this.spriteSheet || !this.metadata) {
return Promise.reject(new Error('No sprite sheet loaded'));
}
return new Promise((resolve, reject) => {
const fps = options.fps || this.fps;
const scale = options.scale || 1;
const loop = options.loop !== undefined ? options.loop : true;
const quality = options.quality || 10;
const onProgress = options.onProgress || (() => {});
// Create a GIF encoder with the proper dimensions
const gif = new GIF({
workers: 4,
quality: quality,
width: this.metadata.frameWidth * scale,
height: this.metadata.frameHeight * scale,
workerScript: 'js/gif.worker.js',
transparent: 'rgba(0,0,0,0)'
});
// Add each frame to the GIF
for (let i = 0; i < this.metadata.frames; i++) {
const frameCanvas = this.getFrameForExport(i);
// If we want to scale the frames
if (scale !== 1) {
const scaledCanvas = document.createElement('canvas');
scaledCanvas.width = this.metadata.frameWidth * scale;
scaledCanvas.height = this.metadata.frameHeight * scale;
const ctx = scaledCanvas.getContext('2d');
ctx.drawImage(
frameCanvas,
0, 0, frameCanvas.width, frameCanvas.height,
0, 0, scaledCanvas.width, scaledCanvas.height
);
gif.addFrame(scaledCanvas, {delay: 1000 / fps, copy: true});
} else {
gif.addFrame(frameCanvas, {delay: 1000 / fps, copy: true});
}
// Report progress
onProgress((i + 1) / this.metadata.frames);
}
// Set up event listeners
gif.on('progress', progress => {
onProgress(progress); // Forward progress updates
});
gif.on('finished', blob => {
resolve(blob); // Return the GIF blob
});
// Start rendering the GIF
gif.render();
});
}
}
// Initialize the player when the page loads
document.addEventListener('DOMContentLoaded', () => {
const player = new SpriteSheetPlayer('animation-canvas');
let exportBlob = null;
let selectedSpriteFile = null;
let selectedJsonFile = null;
// Set up animation control event listeners
document.getElementById('play-btn').addEventListener('click', () => {
player.play();
});
document.getElementById('pause-btn').addEventListener('click', () => {
player.pause();
});
document.getElementById('speed-slider').addEventListener('input', (e) => {
const fps = parseInt(e.target.value);
player.setFPS(fps);
document.getElementById('speed-value').textContent = `${fps} FPS`;
document.getElementById('export-fps').value = fps; // Sync with export FPS
});
document.getElementById('zoom-in').addEventListener('click', () => {
player.setZoom(player.zoom * 1.5);
});
document.getElementById('zoom-out').addEventListener('click', () => {
player.setZoom(player.zoom / 1.5);
});
// Add new upload button handler
document.getElementById('upload-btn').addEventListener('click', () => {
if (!selectedSpriteFile || !selectedJsonFile) {
// Create and trigger hidden file inputs
const spriteInput = document.getElementById('sprite-upload');
const jsonInput = document.getElementById('json-upload');
const uploadBtn = document.getElementById('upload-btn');
if (!selectedSpriteFile) {
uploadBtn.textContent = '📂 Upload Sprite Sheet (.png)';
spriteInput.value = ''; // Reset input before clicking
spriteInput.click();
} else if (!selectedJsonFile) {
uploadBtn.textContent = '📂 Upload Metadata (.json)';
jsonInput.value = ''; // Reset input before clicking
jsonInput.click();
}
} else {
// Load the selected files
document.getElementById('upload-btn').textContent = '📂 Upload Files';
player.loadFromFiles(selectedSpriteFile, selectedJsonFile)
.then(() => {
console.log("Files loaded successfully");
resetGifExport();
// Reset file selections after successful load
resetFileInputs();
})
.catch(error => {
console.error("Error loading files:", error);
alert("Error loading files: " + error.message);
// Reset selection on error
resetFileInputs();
});
}
});
// Handle sprite sheet file selection
document.getElementById('sprite-upload').addEventListener('change', (e) => {
const file = e.target.files[0];
if (file) {
selectedSpriteFile = file;
document.getElementById('sprite-filename').textContent = `Sprite: ${file.name}`;
document.getElementById('upload-btn').textContent = '📂 Upload Metadata (.json)';
}
});
// Handle JSON file selection
document.getElementById('json-upload').addEventListener('change', (e) => {
const file = e.target.files[0];
if (file) {
selectedJsonFile = file;
document.getElementById('json-filename').textContent = `JSON: ${file.name}`;
document.getElementById('upload-btn').textContent = '✅ Load Files';
}
});
// Function to reset all file inputs
function resetFileInputs() {
selectedSpriteFile = null;
selectedJsonFile = null;
document.getElementById('sprite-upload').value = '';
document.getElementById('json-upload').value = '';
document.getElementById('sprite-filename').textContent = 'No sprite sheet selected';
document.getElementById('json-filename').textContent = 'No JSON metadata selected';
document.getElementById('upload-btn').textContent = '📂 Upload Sprite Sheet (.png)';
}
// GIF export button handler
document.getElementById('export-btn').addEventListener('click', () => {
// Get export options
const fps = parseInt(document.getElementById('export-fps').value) || 24;
const scale = parseFloat(document.getElementById('export-scale').value) || 1;
const loop = document.getElementById('export-loop').checked;
const quality = parseInt(document.getElementById('export-quality').value) || 10;
// Update status
document.getElementById('export-status').textContent = 'Starting GIF creation...';
document.getElementById('export-progress').style.width = '0%';
document.getElementById('export-btn').disabled = true;
// Export to GIF
player.exportToGIF({
fps: fps,
scale: scale,
loop: loop,
quality: quality,
onProgress: (progress) => {
document.getElementById('export-progress').style.width = `${Math.floor(progress * 100)}%`;
document.getElementById('export-status').textContent =
`Creating GIF: ${Math.floor(progress * 100)}%`;
}
}).then(blob => {
exportBlob = blob;
// Show GIF preview
const gifPreview = document.getElementById('gif-preview');
gifPreview.src = URL.createObjectURL(blob);
document.querySelector('.gif-output').style.display = 'block';
document.getElementById('export-status').textContent =
`GIF created successfully! Size: ${formatFileSize(blob.size)}`;
document.getElementById('export-btn').disabled = false;
})
.catch(err => {
console.error('GIF export error:', err);
document.getElementById('export-status').textContent = `Error: ${err.message}`;
document.getElementById('export-btn').disabled = false;
});
});
// Download GIF button handler
document.getElementById('download-gif-btn').addEventListener('click', () => {
if (!exportBlob) return;
const fileName = `${player.metadata?.animationName || 'animation'}_${document.getElementById('export-fps').value}fps.gif`;
const downloadLink = document.createElement('a');
downloadLink.href = URL.createObjectURL(exportBlob);
downloadLink.download = fileName;
document.body.appendChild(downloadLink);
downloadLink.click();
document.body.removeChild(downloadLink);
});
// Function to reset GIF export state
function resetGifExport() {
document.getElementById('export-status').textContent = 'Ready to export';
document.getElementById('export-progress').style.width = '0%';
document.getElementById('export-btn').disabled = false;
document.querySelector('.gif-output').style.display = 'none';
exportBlob = null;
}
// Helper function to format file size
function formatFileSize(bytes) {
if (bytes < 1024) return bytes + ' B';
else if (bytes < 1048576) return (bytes / 1024).toFixed(2) + ' KB';
else return (bytes / 1048576).toFixed(2) + ' MB';
}
});
</script>
</body>
</html>