Multi-Touch + Gestures

NetPad provides comprehensive multi-touch support and gesture recognition for creating intuitive mobile controller experiences.

Touch Input System

NetPadTouch Component

The NetPadTouch component captures and synchronizes multi-touch input between client and server:

• TouchArea: Optional RectTransform defining the touch-sensitive area

• Multi-touch Support: Tracks multiple fingers simultaneously by finger ID

• Screen Coordinates: Provides both absolute and screen-relative coordinates

• Delta Tracking: Calculates movement deltas between updates

• Tap Count: Supports tap counting for gesture detection

Touch Data Properties

Each touch provides:

• Position: Absolute screen position

• Delta: Movement since last update

• ScreenRelative: Normalized coordinates (0-1)

• ScreenRelativeDelta: Normalized movement delta

• FingerId: Unique identifier for tracking

• Phase: TouchPhase (Began, Moved, Stationary, Ended, Canceled)

• TapCount: Number of taps detected

• IsInsideTouchArea: Whether touch is within defined TouchArea

Gesture Recognition System

GestureRecognition Component

The GestureRecognition component manages gesture detection and provides two categories of gestures:

Single-Touch Gestures

• SwipeGesture: Directional swipes with configurable minimum distance

• DoubleTapGesture: Double-tap detection with time and distance thresholds

Multi-Touch Gestures

• PinchGesture: Pinch-to-zoom with scale factors and velocity

• RotateGesture: Two-finger rotation with angle tracking

Gesture States

All gestures follow a state machine:

• Possible: Ready to detect gesture

• Began: Gesture started

• Updated: Gesture continuing (multi-touch only)

• Ended: Gesture completed

• Failed: Gesture recognition failed

Implementation Guide

Basic Touch Setup

1. Add NetPadTouch component to your controller scene

2. Optionally configure TouchArea for UI boundaries

3. Access touch data on server via NetPadInput.Touches

// Server-side touch access
foreach (var touch in player.Input.Touches)
{
    if (touch.Phase == TouchPhase.Began)
    {
        Debug.Log($"Touch began at {touch.Position}");
    }
}

Gesture Recognition Setup

1. Add NetPadGesture component to controller scene

2. Add GestureRecognition component for advanced gestures

3. Configure gesture parameters (thresholds, distances, timing)

4. Listen for gesture events on server side

// Server-side gesture handling
player.Input.GestureRecognized += OnGestureRecognized;

void OnGestureRecognized(GestureEventData gestureData)
{
    if (gestureData is SwipeGestureEventData swipeData)
    {
        Debug.Log($"Swipe detected: {swipeData.Direction}");
    }
    else if (gestureData is PinchGestureEventData pinchData)
    {
        Debug.Log($"Pinch scale: {pinchData.CurrentScaleFactor}");
    }
}

Gesture Event Data

SwipeGestureEventData

• StartPosition: Where swipe began

• EndPosition: Where swipe ended

• Direction: SwipeDirection (Left, Right, Up, Down)

• Duration: Time taken for swipe

• Velocity: Speed of swipe movement

DoubleTapGestureEventData

• Basic gesture event (position available from touch data)

PinchGestureEventData

• DeltaVector: Change in centroid position

• Delta: Distance change since last update

• Velocity: Speed of pinch movement

• CumulativeScaleFactor: Total scale since gesture start

• CurrentScaleFactor: Current scale factor

• Centroid: Center point between fingers

• Angle: Angle between touch points

RotateGestureEventData

• AngleDelta: Rotation change since last update

• TotalRotation: Total rotation since gesture start

• Centroid: Center point of rotation

• RotationVelocity: Speed of rotation in degrees/second

Configuration Options

Gesture Parameters

• MinSwipeDistance: Minimum distance for swipe detection (default: 100f)

• MaxTimeBetweenTaps: Double-tap time threshold (default: 0.5f)

• MaxDistanceBetweenTaps: Double-tap distance threshold (default: 50f)

• NoiseFilterThreshold: Rotation noise filtering (default: 0.5f)

Performance Optimization

NetPad optimizes network traffic through:

• Threshold-based updates: Only send changes above configured thresholds

• Frequency separation: OnUpdate() for immediate changes, OnTick() for position updates

• Delta compression: Send only movement changes, not absolute positions

• Touch area filtering: Limit updates to relevant UI areas