private void MyGraphCanvasGrid_PaintSurface(object sender, SkiaSharp.Views.Desktop.SKPaintSurfaceEventArgs e)
{
var canvas = e.Surface.Canvas;
h_grid = (float)myGraphCanvasGrid.CanvasSize.Height;
w_grid = (float)myGraphCanvasGrid.CanvasSize.Width;
DrawGrid(canvas);
}
private void MyGraphCanvas_PaintSurface(object sender, SkiaSharp.Views.Desktop.SKPaintSurfaceEventArgs e)
{
var canvas = e.Surface.Canvas;
h_data = (float)myGraphCanvas.CanvasSize.Height;
w_data = (float)myGraphCanvas.CanvasSize.Width;
// graphics frame duration = Every 15 ms the data is updated and this data point takes 4 pixels. So width / 4 = number of datapoints * 15 ms = duration of 1 frame
GraphicsFrameDuration = ((w_data - 2 * GraphXOffset) / PixelPerDataPoint) * DataRefreshRate;
DrawGraph(canvas);
}
protected virtual void OnPaintSurface(SKPaintSurfaceEventArgs e)
{
// invoke the event
PaintSurface?.Invoke(this, e);
}
private void SkCtrl_PaintSurface(object sender, SkiaSharp.Views.Desktop.SKPaintSurfaceEventArgs e)
{
//var info = e.Info;
//var sf = e.Surface;
//var canvas = sf.Canvas;
//canvas.DrawCircle(info.Width / 2, info.Height / 2, 100, DefPaint);
//DefPaint.Style = SKPaintStyle.Fill;
//DefPaint.Color = SKColors.Blue;
//canvas.DrawCircle(info.Width / 2, info.Height / 2, 100, DefPaint);
SKImageInfo info = e.Info;
SKSurface surface = e.Surface;
SKCanvas canvas = surface.Canvas;
canvas.Clear();
//canvas.Clear(SystemColors.ControlText.ToSKColor());
float maxRadius = 0.75f * Math.Min(info.Width, info.Height) / 2;
float minRadius = 0.25f * maxRadius;
float xRadius = minRadius * CurrentScale + maxRadius * (1 - CurrentScale);
float yRadius = maxRadius * CurrentScale + minRadius * (1 - CurrentScale);
//using (SKPaint paint = new SKPaint())
//{
//DefPaint.Style = SKPaintStyle.Stroke;
//DefPaint.Color = SKColors.Blue;
//DefPaint.StrokeWidth = 50;
//DefPaint.IsAntialias = true;
canvas.DrawOval(info.Width / 2, info.Height / 2, xRadius, yRadius, DefPaint);
//DefPaint.Style = SKPaintStyle.Fill;
//DefPaint.Color = SKColors.SkyBlue;
canvas.DrawOval(info.Width / 2, info.Height / 2, xRadius, yRadius, DefPaint);
//}
//var ii = new SKImageInfo(640, 480,SKColorType.Bgra8888);
//using (var sf = SKSurface.Create(ii))
//{
// SKCanvas c = sf.Canvas;
// c.Clear(SKColors.White);
// c.DrawSurface(surface, new SKPoint(0, 0));
//}
var txt = "Hello World";
var txtWidth = DefPaint.MeasureText(txt);
DefPaint.TextSize = 0.9f * info.Width * DefPaint.TextSize / txtWidth;
var textBounds = new SKRect();
DefPaint.MeasureText(txt, ref textBounds);
float xText = info.Width / 2 - textBounds.MidX;
float yText = info.Height / 2 - textBounds.MidY;
// And draw the text
canvas.DrawText(txt, xText, yText, DefPaint);
using (DefPaint.ImageFilter = SKImageFilter.CreateBlur(5, 5))
{
if (webBitmap != null)
{
canvas.DrawBitmap(webBitmap, new SKRect
{
Left = 50,
Top = 50,
Right = 250,
Bottom = 160
}, DefPaint);
//canvas.DrawBitmap(webBitmap, 0, 0);
}
if (resourceBitmap != null)
{
DefPaint.Color = DefPaint.Color.WithAlpha(100);
canvas.DrawBitmap(resourceBitmap, new SKRect
{
Left = 50,
Top = 180,
Right = 250,
Bottom = 360
}, DefPaint);
DefPaint.Color = DefPaint.Color.WithAlpha(255);
}
}
DefPaint.ImageFilter = null;
//canvas.Clear(SKColors.Transparent);
//canvas.DrawColor(SKColors.Transparent);
//DefPaint.Color = DefPaint.Color.WithAlpha(0);
//DefPaint.Style = SKPaintStyle.Stroke;
//canvas.DrawRect(info.Rect, DefPaint);
//DefPaint.Color = DefPaint.Color.WithAlpha(240);
}