Path gradient and Bezier
<Canvas xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Path Canvas.Left="150" Canvas.Top="150" StrokeThickness="25">
<Path.Stroke>
<LinearGradientBrush>
<LinearGradientBrush.GradientStops>
<GradientStop Offset="0.00" Color="Red" />
<GradientStop Offset="0.84" Color="Red" />
<GradientStop Offset="1.00" Color="Violet" />
</LinearGradientBrush.GradientStops>
</LinearGradientBrush>
</Path.Stroke>
<Path.Data>
<PathGeometry>
<PathGeometry.Figures>
<PathFigure StartPoint="0 -100">
<PolyBezierSegment
Points=" -55 -100, -100 -55, -100 0,
-100 55, -55 100, 0 100,
100 -50, 55 -100, 0 -100" />
</PathFigure>
</PathGeometry.Figures>
</PathGeometry>
</Path.Data>
</Path>
</Canvas>
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