Bug fixes
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Aodhan Collins
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SWIPE_ANIMATIONS.md
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423
SWIPE_ANIMATIONS.md
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# Enhanced Swipe Animation System
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A comprehensive physics-based animation system for the image swiper app, providing realistic swipe interactions with spring effects, momentum calculations, and dynamic visual feedback.
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## Overview
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The enhanced swipe animation system consists of several key components:
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- **SwipePhysics Engine**: Core physics calculations for realistic motion
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- **EnhancedSwipeCard**: Advanced swipe card component with visual effects
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- **SwipeIntegrationManager**: Seamless switching between animation modes
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- **Visual Effects System**: Dynamic feedback during swipe gestures
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## Features
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### 🎯 Physics-Based Animations
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- **Spring Effects**: Realistic spring-back animations when swipe threshold isn't met
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- **Momentum Calculations**: Velocity-based swipe detection and exit animations
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- **Smooth Transitions**: 60fps animations with proper GPU acceleration
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### 🎨 Visual Feedback
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- **Dynamic Blur**: Motion blur effects based on swipe velocity
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- **Color Shifts**: Direction-based hue rotation for visual feedback
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- **3D Transforms**: Enhanced perspective and rotation effects
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- **Particle Effects**: Trailing particles during swipe gestures
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### 📱 Device Optimization
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- **Adaptive Quality**: Automatic animation quality adjustment based on device capabilities
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- **Performance Monitoring**: Real-time FPS tracking and optimization
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- **Reduced Motion Support**: Accessibility compliance for motion-sensitive users
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### ⚙️ Customization
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- **Multiple Modes**: Original, Enhanced Lite, and Full Enhanced modes
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- **User Settings**: Configurable physics parameters and visual effects
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- **Debug Tools**: Performance metrics and state inspection
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## Architecture
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### Core Components
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#### SwipePhysics Class
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```javascript
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import { SwipePhysics } from './js/swipe-physics.js';
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const physics = new SwipePhysics({
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springTension: 300, // Spring stiffness
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springFriction: 30, // Damping coefficient
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mass: 1, // Object mass
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velocityThreshold: 0.5, // Minimum velocity for momentum
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momentumDecay: 0.95 // Momentum decay rate
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});
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```
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**Key Methods:**
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- `updatePosition(x, y, timestamp)`: Track position and calculate velocity
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- `animateSpringTo(targetX, targetY, onUpdate, onComplete)`: Spring-back animation
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- `animateMomentumExit(direction, onUpdate, onComplete)`: Momentum-based exit
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- `getVelocityMagnitude()`: Current velocity magnitude
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- `hasSwipeMomentum(threshold)`: Check if swipe has sufficient momentum
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#### EnhancedSwipeCard Component
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```javascript
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import EnhancedSwipeCard from './components/enhanced-swipe-card.js';
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const swipeCard = new EnhancedSwipeCard({
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container: document.querySelector('.swipe-container'),
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onSwipe: (direction) => console.log('Swiped:', direction),
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threshold: 100,
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velocityThreshold: 2,
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springTension: 280,
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springFriction: 25
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});
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```
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**Features:**
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- Physics-based drag interactions
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- Enhanced 3D tilt effects
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- Visual feedback during swipes
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- Smooth loading animations
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- Performance optimizations
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#### SwipeIntegrationManager
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```javascript
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import { swipeIntegration } from './js/swipe-integration.js';
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// Initialize with automatic mode detection
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await swipeIntegration.initialize(container, onSwipe);
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// Switch modes dynamically
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await swipeIntegration.switchMode('enhanced');
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// Update configuration
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swipeIntegration.updateConfig({
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enablePhysics: true,
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enableVisualEffects: true,
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animationQuality: 'high'
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});
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```
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## Animation Modes
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### Original Mode
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- **Use Case**: Low-end devices, reduced motion preferences
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- **Features**: Basic swipe detection, simple CSS transitions
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- **Performance**: Minimal CPU/GPU usage
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### Enhanced Lite Mode
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- **Use Case**: Mobile devices, moderate performance
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- **Features**: Physics-based springs, reduced visual effects
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- **Performance**: Balanced performance and visual quality
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### Enhanced Mode
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- **Use Case**: Desktop, high-performance devices
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- **Features**: Full physics simulation, all visual effects
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- **Performance**: Maximum visual quality, GPU-accelerated
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## Physics Implementation
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### Spring Dynamics
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The system uses Hooke's Law with damping for realistic spring behavior:
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```
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F = -kx - cv
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```
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Where:
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- `F` = Spring force
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- `k` = Spring tension (stiffness)
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- `x` = Displacement from rest position
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- `c` = Friction coefficient (damping)
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- `v` = Velocity
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### Velocity Tracking
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Velocity is calculated using time-weighted sampling:
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```javascript
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const velocity = (currentPosition - previousPosition) / deltaTime;
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```
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Multiple samples are averaged with recent values weighted more heavily for smooth velocity calculations.
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### Momentum-Based Actions
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Swipe actions are triggered by either:
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1. **Distance threshold**: Displacement exceeds minimum distance
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2. **Velocity threshold**: Swipe velocity exceeds minimum speed
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## Visual Effects
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### Dynamic Blur
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Motion blur is applied based on velocity magnitude:
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```css
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filter: blur(${velocity * 0.1}px);
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```
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### Color Temperature Shifts
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Direction-based hue rotation provides visual feedback:
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- **Left (Discard)**: Red shift (-30°)
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- **Right (Keep)**: Green shift (120°)
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- **Up (Favorite)**: Blue shift (240°)
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- **Down (Review)**: Yellow shift (60°)
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### 3D Transforms
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Enhanced perspective transforms create depth:
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```css
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transform:
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perspective(1200px)
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rotateX(${rotationX}deg)
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rotateY(${rotationY}deg)
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translateZ(${depth}px)
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scale3d(${scale}, ${scale}, 1);
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```
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## Performance Optimizations
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### GPU Acceleration
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- `transform3d()` for hardware acceleration
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- `will-change` property for optimization hints
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- `backface-visibility: hidden` to prevent flickering
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### Frame Rate Monitoring
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```javascript
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// Automatic quality adjustment based on FPS
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if (fps < 30 && animationQuality === 'high') {
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animationQuality = 'medium';
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}
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```
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### Memory Management
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- Particle system with limited count
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- Velocity history with bounded size
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- Automatic cleanup of animation frames
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## Configuration Options
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### Physics Parameters
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```javascript
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{
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springTension: 300, // Spring stiffness (50-500)
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springFriction: 30, // Damping coefficient (10-50)
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mass: 1, // Object mass (0.5-2.0)
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velocityThreshold: 0.5, // Minimum velocity for momentum
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momentumDecay: 0.95, // Momentum decay rate (0.8-0.98)
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maxVelocity: 50, // Maximum velocity clamp
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dampingRatio: 0.8, // Overall damping (0.1-1.0)
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precision: 0.01, // Animation stop precision
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maxDuration: 2000 // Maximum animation duration (ms)
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}
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```
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### Visual Effects
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```javascript
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{
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maxBlur: 8, // Maximum blur amount (px)
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maxOpacity: 0.3, // Maximum opacity reduction
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colorShiftIntensity: 0.2, // Color shift strength
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particleCount: 20, // Maximum particles
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enable3DTilt: true, // Enable 3D tilt effects
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enableParticles: true, // Enable particle trails
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enableHaptics: true // Enable haptic feedback
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}
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```
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## Usage Examples
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### Basic Integration
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```javascript
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import { swipeIntegration } from './js/swipe-integration.js';
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document.addEventListener('DOMContentLoaded', async () => {
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const container = document.querySelector('.swipe-container');
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await swipeIntegration.initialize(container, (direction) => {
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console.log('Swiped:', direction);
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// Handle swipe action
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});
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});
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```
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### Custom Configuration
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```javascript
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// Configure before initialization
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swipeIntegration.updateConfig({
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enablePhysics: true,
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enableVisualEffects: true,
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animationQuality: 'high',
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springTension: 320,
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springFriction: 25
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});
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await swipeIntegration.initialize(container, onSwipe);
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```
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### Mode Switching
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```javascript
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// Switch to enhanced mode
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await swipeIntegration.switchMode('enhanced');
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// Switch to lite mode for performance
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await swipeIntegration.switchMode('enhanced-lite');
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// Fallback to original mode
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await swipeIntegration.switchMode('original');
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```
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### Settings Panel
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```javascript
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import { createSwipeSettingsPanel } from './js/swipe-integration.js';
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// Create settings panel
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const settingsPanel = createSwipeSettingsPanel(swipeIntegration);
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document.body.appendChild(settingsPanel);
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```
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## Browser Compatibility
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### Supported Features
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- **Modern Browsers**: Full enhanced mode support
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- **Safari**: Full support with vendor prefixes
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- **Mobile Browsers**: Enhanced lite mode recommended
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- **Legacy Browsers**: Automatic fallback to original mode
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### Required APIs
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- `requestAnimationFrame` (required)
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- `performance.now()` (required)
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- `CSS transforms` (required)
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- `CSS filters` (optional, for visual effects)
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- `Vibration API` (optional, for haptic feedback)
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## Accessibility
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### Reduced Motion Support
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```css
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@media (prefers-reduced-motion: reduce) {
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.enhanced-card {
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animation: none !important;
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transition: none !important;
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}
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}
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```
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### High Contrast Mode
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```css
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@media (prefers-contrast: high) {
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.enhanced-hint {
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background: rgba(0, 0, 0, 0.95);
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border-width: 3px;
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}
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}
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```
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### Keyboard Navigation
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- **Arrow Keys**: Trigger swipe actions
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- **WASD Keys**: Alternative swipe controls
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- **Ctrl/Cmd + ,**: Open settings panel
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- **Escape**: Close modals and panels
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## Debugging
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### Debug Mode
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```javascript
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swipeIntegration.updateConfig({ debugMode: true });
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// Access debug information
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const debugInfo = swipeIntegration.getDebugInfo();
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console.log('Debug Info:', debugInfo);
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```
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### Performance Metrics
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```javascript
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const metrics = swipeIntegration.getPerformanceMetrics();
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console.log('Performance:', metrics);
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```
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### State Inspection
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```javascript
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// Access global debug objects
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console.log('Swipe State:', window.enhancedSwipeState);
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console.log('Swipe Card:', window.enhancedSwipeCard);
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console.log('Integration:', window.swipeIntegration);
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```
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## Troubleshooting
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### Common Issues
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#### Poor Performance
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- **Solution**: Switch to 'enhanced-lite' or 'original' mode
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- **Check**: Device memory and CPU capabilities
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- **Adjust**: Reduce particle count and visual effects
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#### Animations Not Working
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- **Check**: Browser support for CSS transforms
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- **Verify**: JavaScript modules are loading correctly
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- **Test**: Fallback to original mode
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#### Touch Events Not Responding
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- **Check**: Touch event listeners are properly attached
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- **Verify**: `touch-action: none` is applied to card element
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- **Test**: Mouse events as fallback
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### Performance Tips
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1. **Use Enhanced Lite on Mobile**: Better performance with good visual quality
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2. **Monitor Frame Rate**: Enable debug mode to track performance
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3. **Reduce Particle Count**: Lower particle count for better performance
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4. **Disable Visual Effects**: Turn off blur and color effects on low-end devices
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## Future Enhancements
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### Planned Features
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- **Card Stacking**: Multiple cards with depth layering
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- **Gesture Recognition**: Advanced swipe patterns
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- **Sound Effects**: Audio feedback for actions
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- **Custom Animations**: User-defined animation curves
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### API Improvements
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- **React Integration**: React component wrapper
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- **Vue Integration**: Vue component wrapper
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- **TypeScript Support**: Full type definitions
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- **Web Components**: Custom element implementation
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## Contributing
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### Development Setup
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```bash
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# Clone repository
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git clone <repository-url>
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# Install dependencies
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npm install
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# Start development server
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npm run dev
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# Build for production
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npm run build
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```
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### Testing
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```bash
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# Run unit tests
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npm test
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# Run performance tests
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npm run test:performance
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# Run accessibility tests
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npm run test:a11y
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```
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### Code Style
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- Use ESLint configuration
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- Follow JSDoc conventions
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- Maintain 80% test coverage
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- Use semantic versioning
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## License
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This enhanced swipe animation system is part of the image swiper application and follows the same licensing terms.
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---
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For more information, see the individual component documentation files or contact the development team.
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