void OnCanvasViewPaintSurface(object sender, SkiaSharp.Views.Forms.SKPaintSurfaceEventArgs args)
{
SkiaSharp.SKImageInfo info = args.Info;
SkiaSharp.SKSurface surface = args.Surface;
SkiaSharp.SKCanvas canvas = surface.Canvas;
canvas.Clear();
SkiaSharp.SKRect bounds;
SkiaSharp.SKPath path = SkiaSharp.SKPath.ParseSvgPathData((string)this.Resources["PathString"]);
path.GetTightBounds(out bounds);
SkiaSharp.SKPaint paint = new SkiaSharp.SKPaint
{
Style = SkiaSharp.SKPaintStyle.Stroke,
Color = SkiaSharp.SKColors.Black,
StrokeWidth = 10,
StrokeCap = SkiaSharp.SKStrokeCap.Round,
StrokeJoin = SkiaSharp.SKStrokeJoin.Round
};
canvas.Translate(info.Width / 2, info.Height / 2);
canvas.Scale(info.Width / (bounds.Width + paint.StrokeWidth),
info.Height / (bounds.Height + paint.StrokeWidth));
canvas.Translate(-bounds.MidX, -bounds.MidY);
canvas.DrawPath(path, paint);
}
private void DrawPasteOverlay(Avalonia.Point dominoPoint, PointerEventArgs e)
{
// display the dominoes to paste as a half-transparent overlay.
// reference point:
var reference_point = Dominoes[toCopy.Min()].CenterPoint - dominoPoint;
if (PasteOverlays.Count == 0)
{
// create the overlays
foreach (int i in toCopy)
{
var p = new SkiaSharp.SKPath();
var points = Dominoes[i].CanvasPoints;
if (points.Length > 1)
{
p.MoveTo(new SkiaSharp.SKPoint((float)points[0].X - (float)reference_point.X, (float)points[0].Y - (float)reference_point.Y));
foreach (var point in points.Skip(1))
{
p.LineTo(new SkiaSharp.SKPoint((float)point.X - (float)reference_point.X, (float)point.Y - (float)reference_point.Y));
}
}
var color = Dominoes[i].StoneColor.ToSKColor().WithAlpha(128);
PasteOverlays.Add(new CanvasDrawable()
{
BeforeBorders = false, Paint = new SkiaSharp.SKPaint()
{
Color = color
}, Path = p
});
}
AdditionalDrawables.AddRange(PasteOverlays);
}
else
{
// find out difference between current and last reference point
var shift = lastreference - reference_point;
var transform = SkiaSharp.SKMatrix.CreateTranslation((float)shift.X, (float)shift.Y);
System.Diagnostics.Debug.WriteLine(shift);
foreach (var stone in PasteOverlays)
{
stone.Path.Transform(transform);
}
}
lastreference = reference_point;
Redraw();
}
protected override void OnPaintSurface(SKPaintSurfaceEventArgs e)
{
try
{
var w = e.Info.Width;
var h = e.Info.Height;
float cx = w / 2.0f;
float cy = h / 2.0f;
float Radius = Math.Min(cx, cy);
Paint.Typeface = Font;
float currentRate = 0;
foreach (var item in Members)
{
paint.IsAntialias = true;
{
var path = new SkiaSharp.SKPath();
if (item.Rate % 1 == 0f && item.Rate > 0.5f)
{
path.AddCircle(cx, cy, Radius * OuterRate);
}
else
{
path.ArcTo(new SkiaSharp.SKRect(cx - Radius * OuterRate, cy - Radius * OuterRate, cx + Radius * OuterRate, cy + Radius * OuterRate), 360 * (currentRate - 0.25f), 360 * item.Rate, false);
path.LineTo(cx, cy);
//path.LineTo(cx + Radius * (float)Math.Sin(Math.PI * 2 * currentRate) * OuterRate, cy - Radius * (float)Math.Cos(Math.PI * 2 * currentRate) * OuterRate);
path.Close();
}
Paint.Color = item.Color;
Paint.IsStroke = false;
e.Surface.Canvas.DrawPath(path, Paint);
}
{
var path = new SkiaSharp.SKPath();
path.MoveTo(cx + Radius * (float)Math.Sin(Math.PI * 2 * currentRate) * OuterRate, cy - Radius * (float)Math.Cos(Math.PI * 2 * currentRate) * OuterRate);
path.LineTo(cx, cy);
Paint.Color = new SkiaSharp.SKColor(255, 255, 255, 0);
Paint.StrokeWidth = Radius * 0.02f;
Paint.IsStroke = true;
Paint.BlendMode = SkiaSharp.SKBlendMode.Clear;
e.Surface.Canvas.DrawPath(path, Paint);
Paint.BlendMode = SkiaSharp.SKBlendMode.SrcOver;
}
currentRate += item.Rate;
}
{
Paint.Color = new SkiaSharp.SKColor(255, 255, 255);
Paint.IsStroke = false;
Paint.BlendMode = SkiaSharp.SKBlendMode.Clear;
e.Surface.Canvas.DrawCircle(cx, cy, Radius * InnerRate, Paint);
Paint.BlendMode = SkiaSharp.SKBlendMode.SrcOver;
}
{
var path = new SkiaSharp.SKPath();
path.MoveTo(cx + Radius * (float)Math.Sin(Math.PI * 2 * currentRate) * OuterRate, cy - Radius * (float)Math.Cos(Math.PI * 2 * currentRate) * OuterRate);
path.LineTo(cx, cy);
Paint.Color = new SkiaSharp.SKColor(255, 255, 255, 0);
Paint.StrokeWidth = Radius * 0.02f;
Paint.IsStroke = true;
Paint.BlendMode = SkiaSharp.SKBlendMode.Clear;
e.Surface.Canvas.DrawPath(path, Paint);
Paint.BlendMode = SkiaSharp.SKBlendMode.SrcOver;
}
{
Paint.TextSize = TitleFontSize * Radius;
Paint.Color = new SkiaSharp.SKColor(0, 0, 0);
Paint.IsStroke = false;
Paint.TextAlign = SkiaSharp.SKTextAlign.Center;
e.Surface.Canvas.DrawText(Title, cx, cy + Paint.FontMetrics.AverageCharacterWidth / 2.0f, Paint);
}
}
catch { }
base.OnPaintSurface(e);
}
