Created
May 17, 2020 01:13
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system.drawing to skiasharp
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| public string DrawRegularPolygonSK(int vertexCount, float radius, SocketCommandContext context, [Optional] int rndNum) | |
| { | |
| string imagesPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "data", "images"); | |
| if (!Directory.Exists(imagesPath)) | |
| Directory.CreateDirectory(imagesPath); | |
| using (SKBitmap bmp = new SKBitmap(1024, 1024)) | |
| using (SKPaint outerPaint = new SKPaint()) | |
| using (SKPaint innerPaint = new SKPaint()) | |
| using (SKPaint textPaint = new SKPaint()) | |
| using (SKCanvas canvas = new SKCanvas(bmp)) | |
| { | |
| SKPoint center = new SKPoint(bmp.Width / 2, bmp.Height / 2); | |
| var angle = Math.PI * 2 / vertexCount; | |
| var points = Enumerable.Range(0, vertexCount).Select(i => SKPoint.Add(center, new SKSize((float)Math.Sin(i * angle) * radius, | |
| (float)Math.Cos(i * angle) * radius))); | |
| var color = GetGuildUserRoleColor(context.User as SocketGuildUser).Result; | |
| canvas.Clear(); | |
| // this is for the filling of the polygon. | |
| innerPaint.Color = new SKColor(color.R, color.G, color.B); | |
| innerPaint.Style = SKPaintStyle.Fill; | |
| innerPaint.StrokeWidth = 5f; | |
| SKPath innerPath = new SKPath(); | |
| foreach (var point in points) | |
| { | |
| if (point == points.First()) | |
| innerPath.MoveTo(point); | |
| else | |
| innerPath.LineTo(point); | |
| } | |
| innerPath.Close(); | |
| canvas.DrawPath(innerPath, innerPaint); | |
| // this is for the lines of the polygon. | |
| outerPaint.Color = SKColors.Black; | |
| outerPaint.StrokeWidth = 10f; | |
| outerPaint.StrokeCap = SKStrokeCap.Round; | |
| outerPaint.Style = SKPaintStyle.Stroke; | |
| SKPath outerPath = new SKPath(); | |
| foreach (var point in points) | |
| { | |
| if (point == points.First()) | |
| outerPath.MoveTo(point); | |
| else | |
| outerPath.LineTo(point); | |
| } | |
| outerPath.Close(); | |
| canvas.DrawPath(outerPath, outerPaint); | |
| // this is for the text. | |
| textPaint.TextSize = 240f; | |
| textPaint.IsAntialias = true; | |
| if (color.R * 0.299f + color.G * 0.587f + color.B * 0.114f > 150) // decides the color of text based on bg color | |
| textPaint.Color = SKColors.Black; | |
| else | |
| textPaint.Color = SKColors.White; | |
| textPaint.Style = SKPaintStyle.StrokeAndFill; | |
| textPaint.StrokeWidth = 15f; | |
| textPaint.TextAlign = SKTextAlign.Center; | |
| textPaint.GetFontMetrics(out var skFontMetrics); | |
| canvas.DrawText(rndNum.ToString(), center.X, center.Y + skFontMetrics.CapHeight / 2, textPaint); // text's height is 188 pixels at size 240f and stroke 15f | |
| using (var stream = File.Create(Path.Combine(imagesPath, context.Message.Id.ToString() + ".png"))) | |
| { | |
| SKData data = SKImage.FromBitmap(bmp).Encode(SKEncodedImageFormat.Png, 100); | |
| data.SaveTo(stream); | |
| } | |
| return Path.Combine(imagesPath, context.Message.Id.ToString() + ".png").ToString(); | |
| } | |
| } |
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