Add SKSignaturePadView with pressure-sensitive ink rendering

[Copilot]

Signature pad control with fluid ink rendering. Uses stylus/pen pressure to vary stroke width and quadratic Bézier interpolation to smooth jagged input.

Implementation

• SKInkStroke: Pressure-aware stroke model. Renders variable-width strokes as filled polygons using offset curves from the centerline. Width = minWidth + (maxWidth - minWidth) * pressure.
• SKSignaturePadView: Touch-enabled control extending SKSurfaceView. Supports both SKCanvasView and SKGLView templates.
• Multi-touch rejection: Tracks activeTouchId to accept only first touch point.
• Resource management: Both classes implement IDisposable. Event handlers properly unsubscribed in OnApplyTemplate.

API

// XAML
<skia:SKSignaturePadView
    StrokeColor="DarkBlue"
    MinStrokeWidth="1"
    MaxStrokeWidth="10" />

// Export
var image = signaturePad.ToImage(400, 200, SKColors.White);
var path = signaturePad.ToPath();

// Operations
signaturePad.Undo();
signaturePad.Clear();

Algorithm

1. Collect touch points with pressure values
2. Filter points below minimum distance threshold
3. Interpolate with quadratic Bézier curves through midpoints
4. Generate left/right offset curves based on pressure-derived width
5. Render as filled polygon with semicircular end caps

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

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Original prompt

Please investigate the dev/signatures branch and see how you can use that to help design and create a signature pad control. The goal is to get fluid like ink the way windows has natively. The harder the presser the thinker the lines. do some reasearch and think about how we can do this. we want to convert in real time the jagged path of a finger or pen and if there is pressure data we want to use that to change pen thinkness.

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