Exemplo n.º 1
0
        private void PaintSurface(object sender, SKPaintSurfaceEventArgs e)
        {
            const int   count           = 10;           //number of digits in outer circle
            const float r               = 100f;         //outer circle radius
            const float f               = 40f;          //font size in points
            const float thicknessAdjust = 2 * f / 3;    //thickness adjust of the two circles
            const float θ               = 360f / count; //angle to rotate when drawing each digit

            if (painter == null)
            {
                painter = new SkiaSharp.MathPainter(f);            //{ GlyphBoxColor = (SKColors.Red, SKColors.Red) };
            }
            var cx = e.Info.Width / 2;
            var cy = e.Info.Height / 2;
            var c  = e.Surface.Canvas;

            //draw outer circle
            c.DrawCircle(cx, cy, r + thicknessAdjust, black);
            painter.TextColor = SKColors.White;
            for (int i = 0; i < count; i++)
            {
                painter.LaTeX = i.ToString();
                var m = painter.Measure.Value;
                painter.Draw(c, cx - m.Width / 2, cy - r - m.Y / 2);
                c.RotateDegrees(θ, cx, cy);
            }
            //draw inner circle
            c.DrawCircle(cx, cy, r - thicknessAdjust, white);
            painter.TextColor = SKColors.Black;
            painter.LaTeX     = @"\raisebox{25mu}{\text{\kern.7222emC\#}\\Math}"; //.7222em is 13/18em
            painter.Draw(c);
        }
Exemplo n.º 2
0
        public static void Draw(SKCanvas c)
        {
            const int   count           = 10;           //number of digits in outer circle
            const float r               = 100f;         //outer circle radius
            const float f               = 40f;          //font size in points
            const float thicknessAdjust = 2 * f / 3;    //thickness adjust of the two circles
            const float θ               = 360f / count; //angle to rotate when drawing each digit
            var         painter         = new SkiaSharp.MathPainter();
            var         cx              = c.DeviceClipBounds.Width / 2;
            var         cy              = c.DeviceClipBounds.Height / 2;

            painter.FontSize = f; //{ GlyphBoxColor = (SKColors.Red, SKColors.Red) };
            //draw outer circle
            using (var black = new SKPaint {
                Color = SKColors.Black, IsAntialias = true
            })
                c.DrawCircle(cx, cy, r + thicknessAdjust, black);
            painter.TextColor = SKColors.White;
            for (int i = 0; i < count; i++)
            {
                painter.LaTeX = i.ToString();
                var m = painter.Measure() ?? throw new Structures.InvalidCodePathException("Invalid LaTeX");
                painter.Draw(c, cx - m.Width / 2, cy + m.Height / 2 - r);
                c.RotateDegrees(θ, cx, cy);
            }
            //draw inner circle
            using (var white = new SKPaint {
                Color = SKColors.White, IsAntialias = true
            })
                c.DrawCircle(cx, cy, r - thicknessAdjust, white);
            painter.TextColor = SKColors.Black;
            painter.LaTeX     = @"\ \raisebox{25mu}{\begin{gather}C\#\\Math\end{gather}}\ ";
            painter.Draw(c);
        }