private void DrawBorder(SKCanvas canvas)
{
var pancake = Element as PancakeView;
if (pancake.Border != null && pancake.Border.Thickness != default)
{
using (var paint = new SKPaint())
{
var border = pancake.Border;
paint.Style = SKPaintStyle.Stroke;
paint.Color = border.Color.ToNative().ToSKColor();
paint.StrokeWidth = Forms.ConvertToScaledPixel(border.Thickness);
paint.IsAntialias = true;
SKPath path;
if (pancake.Sides != 4)
{
path = DrawingExtensions.CreatePolygonPath(Control.Geometry.Width, Control.Geometry.Height,
pancake.Sides, pancake.CornerRadius.TopLeft, pancake.OffsetAngle);
}
else
{
var left = Control.Geometry.Left - _skCanvasView.Geometry.Left;
var top = Control.Geometry.Top - _skCanvasView.Geometry.Top;
path = DrawingExtensions.CreateRoundedRectPath(left, top, left + Control.Geometry.Width, top + Control.Geometry.Height, pancake.CornerRadius);
}
if (border.DashPattern.Pattern != null &&
border.DashPattern.Pattern.Length > 0 &&
(border.DashPattern.Pattern.Length % 2 == 0 || border.DashPattern.Pattern.Length == 1))
{
var items = border.DashPattern.Pattern.Select(x => Convert.ToSingle(x)).ToList();
if (items.Count == 1)
{
items.Add(items[0]);
}
paint.PathEffect = SKPathEffect.CreateDash(items.ToArray(), 0);
}
if (border.GradientStops != null && border.GradientStops.Any())
{
var startPoint = new SKPoint((float)(border.GradientStartPoint.X * Control.Geometry.Width), (float)(border.GradientStartPoint.Y * Control.Geometry.Height));
var endPoint = new SKPoint((float)(border.GradientEndPoint.X * Control.Geometry.Width), (float)(border.GradientEndPoint.Y * Control.Geometry.Height));
var orderedStops = border.GradientStops.OrderBy(x => x.Offset).ToList();
var gradientColors = orderedStops.Select(x => x.Color.ToNative().ToSKColor()).ToArray();
var gradientColorPos = orderedStops.Select(x => x.Offset).ToArray();
paint.Shader = SKShader.CreateLinearGradient(startPoint, endPoint, gradientColors, gradientColorPos, SKShaderTileMode.Clamp);
}
canvas.ClipPath(path, SKClipOperation.Intersect, true);
canvas.DrawPath(path, paint);
}
}
}
private void DrawShadow(SKCanvas canvas)
{
var pancake = Element as PancakeView;
if (pancake.Shadow != null)
{
SKPath path;
if (pancake.Sides != 4)
{
path = DrawingExtensions.CreatePolygonPath(Control.Geometry.Width, Control.Geometry.Height,
pancake.Sides, pancake.CornerRadius.TopLeft, pancake.OffsetAngle);
}
else
{
var left = Control.Geometry.Left - _skCanvasView.Geometry.Left;
var top = Control.Geometry.Top - _skCanvasView.Geometry.Top;
path = DrawingExtensions.CreateRoundedRectPath(left, top, left + Control.Geometry.Width, top + Control.Geometry.Height, pancake.CornerRadius);
}
using (var paint = new SKPaint())
{
paint.IsAntialias = true;
paint.Style = SKPaintStyle.StrokeAndFill;
var shadow = pancake.Shadow;
var scaledOffsetX = Forms.ConvertToScaledPixel(shadow.Offset.X);
var scaledOffsetY = Forms.ConvertToScaledPixel(shadow.Offset.Y);
var scaledBlurRadius = Forms.ConvertToScaledPixel(shadow.BlurRadius);
canvas.Save();
canvas.ClipPath(path, SKClipOperation.Difference, true);
paint.ImageFilter = SKImageFilter.CreateDropShadow(
scaledOffsetX,
scaledOffsetY,
scaledBlurRadius,
scaledBlurRadius,
shadow.Color.MultiplyAlpha(shadow.Opacity).ToNative().ToSKColor(),
SKDropShadowImageFilterShadowMode.DrawShadowOnly);
canvas.DrawPath(path, paint);
canvas.Restore();
canvas.Save();
canvas.ClipPath(path, SKClipOperation.Intersect, true);
canvas.DrawPath(path, paint);
canvas.Restore();
}
}
}
private void DrawBackground(SKCanvas canvas)
{
using (var paint = new SKPaint())
{
paint.Style = SKPaintStyle.Fill;
paint.IsAntialias = true;
var pancake = Element as PancakeView;
SKPath path;
if (pancake.Sides != 4)
{
path = DrawingExtensions.CreatePolygonPath(Control.Geometry.Width, Control.Geometry.Height,
pancake.Sides, pancake.CornerRadius.TopLeft, pancake.OffsetAngle);
}
else
{
var left = Control.Geometry.Left - _skCanvasView.Geometry.Left;
var top = Control.Geometry.Top - _skCanvasView.Geometry.Top;
path = DrawingExtensions.CreateRoundedRectPath(left, top, left + Control.Geometry.Width, top + Control.Geometry.Height, pancake.CornerRadius);
}
if (pancake.BackgroundGradientStops != null && pancake.BackgroundGradientStops.Any())
{
var orderedStops = pancake.BackgroundGradientStops.OrderBy(x => x.Offset).ToList();
var gradientColors = orderedStops.Select(x => x.Color.ToNative().ToSKColor()).ToArray();
var gradientColorPos = orderedStops.Select(x => x.Offset).ToArray();
var startPoint = new SKPoint((float)(pancake.BackgroundGradientStartPoint.X * Control.Geometry.Width), (float)(pancake.BackgroundGradientStartPoint.Y * Control.Geometry.Height));
var endPoint = new SKPoint((float)(pancake.BackgroundGradientEndPoint.X * Control.Geometry.Width), (float)(pancake.BackgroundGradientEndPoint.Y * Control.Geometry.Height));
paint.Shader = SKShader.CreateLinearGradient(startPoint, endPoint, gradientColors, gradientColorPos, SKShaderTileMode.Clamp);
}
else
{
paint.Color = pancake.BackgroundColor.ToNative().ToSKColor();
}
canvas.ClipPath(path, SKClipOperation.Intersect, true);
canvas.DrawPath(path, paint);
}
}
