private void SKCanvasView_PaintSurface(object sender, SKPaintSurfaceEventArgs args)
{
SKImageInfo info = args.Info;
SKSurface surface = args.Surface;
SKCanvas canvas = surface.Canvas;
canvas.Clear();
using (SKPaint paint = new SKPaint())
{
// define the color for the shadow
SKColor shadowColor = Color.FromHex("#000000").ToSKColor();
paint.IsDither = true;
paint.IsAntialias = true;
paint.Color = shadowColor;
// create filter for drop shadow
paint.ImageFilter = SKImageFilter.CreateDropShadowOnly(
dx: 0, dy: 0,
sigmaX: 40, sigmaY: 40,
color: shadowColor);
// define where I want to draw the object
var corner = info.Width / 2;
var shadowBounds = new SKRect(65, 65, 460, 460);
canvas.DrawRoundRect(shadowBounds, corner, corner, paint);
}
}
protected override void OnBackgroundPaint(object sender, SKPaintSurfaceEventArgs e)
{
var canvas = e.Surface.Canvas;
var bound = e.Info.Rect;
canvas.Clear();
var bgColor = Element.BackgroundColor.IsDefault() ? s_defaultColor : SKColor.Parse(Element.BackgroundColor.ToHex());
var borderColor = Element.BorderColor.IsDefault() ? s_defaultColor : SKColor.Parse(Element.BorderColor.ToHex());
var roundRect = CreateRoundRect(bound);
using (var paint = new SKPaint
{
IsAntialias = true,
})
{
if (Element.HasShadow)
{
paint.Color = SKColors.White;
paint.Style = SKPaintStyle.Stroke;
// Draw shadow
paint.ImageFilter = SKImageFilter.CreateDropShadowOnly(
Forms.ConvertToScaledPixel(0),
Forms.ConvertToScaledPixel(0),
Forms.ConvertToScaledPixel(s_borderWidth * 2),
Forms.ConvertToScaledPixel(s_borderWidth * 2),
SKColors.Black);
canvas.DrawRoundRect(roundRect, paint);
}
paint.ImageFilter = null;
paint.Style = SKPaintStyle.Fill;
paint.Color = bgColor;
// Draw background color
canvas.DrawRoundRect(roundRect, paint);
paint.Style = SKPaintStyle.Stroke;
paint.StrokeWidth = Forms.ConvertToScaledPixel(s_borderWidth);
paint.Color = borderColor;
// Draw Background (Brush)
using (var brushPaint = Element.GetBackgroundPaint(bound))
{
if (brushPaint != null)
{
canvas.DrawRoundRect(roundRect, brushPaint);
}
}
// Draw border
canvas.DrawRoundRect(roundRect, paint);
}
}
protected virtual void OnShadowPaint(object sender, SKPaintSurfaceEventArgs e)
{
var canvas = e.Surface.Canvas;
var bound = e.Info.Rect;
canvas.Clear();
// Draw shadow
if (ShadowElement.HasShadow)
{
using (var paint = new SKPaint
{
IsAntialias = true,
Style = SKPaintStyle.StrokeAndFill
})
{
using (var path = CreateShadowPath())
{
var scaledOffsetX = Forms.ConvertToScaledPixel(ShadowElement.ShadowOffsetX);
var scaledOffsetY = Forms.ConvertToScaledPixel(ShadowElement.ShadowOffsetY);
var scaledBlurRadius = Forms.ConvertToScaledPixel(ShadowElement.ShadowBlurRadius);
canvas.Save();
canvas.ClipPath(path, SKClipOperation.Difference, true);
paint.ImageFilter = SKImageFilter.CreateDropShadowOnly(
scaledOffsetX,
scaledOffsetY,
scaledBlurRadius,
scaledBlurRadius,
ShadowElement.ShadowColor.MultiplyAlpha(ShadowElement.ShadowOpacity).ToSK());
canvas.DrawPath(path, paint);
canvas.Restore();
canvas.Save();
canvas.ClipPath(path, SKClipOperation.Intersect, true);
canvas.DrawPath(path, paint);
canvas.Restore();
}
}
}
}
protected override void OnBackgroundPaint(object sender, SKPaintSurfaceEventArgs e)
{
var canvas = e.Surface.Canvas;
var bound = e.Info.Rect;
canvas.Clear();
var bgColor = Element.BackgroundColor == Color.Default ? s_defaultColor : SKColor.Parse(Element.BackgroundColor.ToHex());
var borderColor = ShadowElement.BorderColor == Color.Default ? s_defaultColor : SKColor.Parse(ShadowElement.BorderColor.ToHex());
using (var paint = new SKPaint
{
IsAntialias = true,
})
{
using (var path = GetRoundRectPath(false))
{
// Draw shadow here only if you choose useShadowClip = true. (this means no use of shadow canvas)
if (UseShadowClipping && ShadowElement.HasShadow)
{
using (var path2 = GetRoundRectPath(true))
{
paint.Style = SKPaintStyle.StrokeAndFill;
var scaledOffsetX = Forms.ConvertToScaledPixel(ShadowElement.ShadowOffsetX);
var scaledOffsetY = Forms.ConvertToScaledPixel(ShadowElement.ShadowOffsetY);
var scaledBlurRadius = Forms.ConvertToScaledPixel(ShadowElement.ShadowBlurRadius);
canvas.Save();
canvas.ClipPath(path2, SKClipOperation.Difference, true);
paint.ImageFilter = SKImageFilter.CreateDropShadowOnly(
scaledOffsetX,
scaledOffsetY,
scaledBlurRadius,
scaledBlurRadius,
ShadowElement.ShadowColor.MultiplyAlpha(ShadowElement.ShadowOpacity).ToSK());
canvas.DrawPath(path2, paint);
canvas.Restore();
canvas.Save();
canvas.ClipPath(path2, SKClipOperation.Intersect, true);
canvas.DrawPath(path2, paint);
canvas.Restore();
}
}
// Draw background color
paint.ImageFilter = null;
paint.Style = SKPaintStyle.Fill;
paint.Color = bgColor;
canvas.DrawPath(path, paint);
// Draw Background (Brush)
using (var brushPaint = Element.GetBackgroundPaint(bound))
{
if (brushPaint != null)
{
canvas.DrawPath(path, brushPaint);
}
}
// Draw border
if (ShadowElement.BorderWidth != 0)
{
paint.IsAntialias = true;
paint.Style = SKPaintStyle.Stroke;
paint.StrokeWidth = Forms.ConvertToScaledPixel(ShadowElement.BorderWidth);
paint.Color = borderColor;
canvas.DrawPath(path, paint);
}
}
}
}
