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feat: Added CompositionLinearGradientBrush implementation
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30 changes: 30 additions & 0 deletions
30
src/Uno.UWP/UI/Composition/CompositionLinearGradientBrush.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,30 @@ | ||
| #nullable enable | ||
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| using System.Numerics; | ||
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| namespace Windows.UI.Composition | ||
| { | ||
| public partial class CompositionLinearGradientBrush : CompositionGradientBrush | ||
| { | ||
| private Vector2 _startPoint = Vector2.Zero; | ||
| private Vector2 _endPoint = new Vector2(1, 0); | ||
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| internal CompositionLinearGradientBrush(Compositor compositor) | ||
| : base(compositor) | ||
| { | ||
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| } | ||
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| public Vector2 StartPoint | ||
| { | ||
| get => _startPoint; | ||
| set => SetProperty(ref _startPoint, value); | ||
| } | ||
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| public Vector2 EndPoint | ||
| { | ||
| get => _endPoint; | ||
| set => SetProperty(ref _endPoint, value); | ||
| } | ||
| } | ||
| } |
50 changes: 50 additions & 0 deletions
50
src/Uno.UWP/UI/Composition/CompositionLinearGradientBrush.skia.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,50 @@ | ||
| #nullable enable | ||
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| using SkiaSharp; | ||
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| namespace Windows.UI.Composition | ||
| { | ||
| public partial class CompositionLinearGradientBrush | ||
| { | ||
| private protected override void UpdatePaintCore(SKPaint paint, SKRect bounds) | ||
| { | ||
| var startPoint = StartPoint.ToSKPoint(); | ||
| var endPoint = EndPoint.ToSKPoint(); | ||
| var transform = CreateTransformMatrix(bounds); | ||
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| // Transform the points into absolute coordinates. | ||
| if (MappingMode == CompositionMappingMode.Relative) | ||
| { | ||
| // If mapping is relative to bounding box, multiply points by bounds. | ||
| startPoint.X *= (float)bounds.Width; | ||
| startPoint.Y *= (float)bounds.Height; | ||
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| endPoint.X *= (float)bounds.Width; | ||
| endPoint.Y *= (float)bounds.Height; | ||
| } | ||
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| // Translate gradient points by bounds offset. | ||
| startPoint.X += bounds.Left; | ||
| startPoint.Y += bounds.Top; | ||
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| endPoint.X += bounds.Left; | ||
| endPoint.Y += bounds.Top; | ||
| // | ||
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| // Create linear gradient shader. | ||
| var shader = SKShader.CreateLinearGradient( | ||
| startPoint, endPoint, | ||
| Colors, ColorPositions, | ||
| TileMode, transform); | ||
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| // Clean up old shader | ||
| if (paint.Shader != null) | ||
| { | ||
| paint.Shader.Dispose(); | ||
| paint.Shader = null; | ||
| } | ||
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| paint.Shader = shader; | ||
| } | ||
| } | ||
| } |