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);
}
/// <summary>
/// Konvertiert die Farbe in den Lab-Farbraum.
/// </summary>
/// <param name="input"></param>
/// <returns></returns>
public static void Save(this SkiaSharp.SKSurface surf, string filename)
{
using (var image = surf.Snapshot().Encode())
{
using (var stream = File.OpenWrite(filename))
{
image.SaveTo(stream);
}
}
}
public void Redraw(SkiaSharp.SKSurface surface)
{
for (var i = 0; i < ElementController.LogicalChildren.Count; i++)
{
var child = ElementController.LogicalChildren[i] as VisualElement;
if (child != null)
{
OnChildRedraw(child, surface);
// update logical children
var viewRenderer = DoodlePlatform.GetDoodleRenderer(child);
viewRenderer.Packager.Redraw(surface);
}
}
}
public SKPaintSurfaceEventArgs(SkiaSharp.SKSurface surface, SkiaSharp.SKImageInfo info)
{
Surface = surface;
Info = info;
}
public void DrawSurface(CGContext ctx, CGRect viewBounds, SkiaSharp.SKImageInfo info, SkiaSharp.SKSurface surface)
{
if (info.Width == 0 || info.Height == 0)
{
return;
}
surface.Canvas.Flush();
// draw the image onto the context
using (var colorSpace = CGColorSpace.CreateDeviceRGB())
using (var image = new CGImage(info.Width, info.Height, BitsPerByte, info.BytesPerPixel * BitsPerByte, info.RowBytes, colorSpace, BitmapFlags, dataProvider, null, false, CGColorRenderingIntent.Default))
{
#if __IOS__ || __TVOS__ || __WATCHOS__ || HAS_UNO
// we need to flip the image as we are mixing CoreGraphics and UIKit functions:
// https://developer.apple.com/library/ios/documentation/2DDrawing/Conceptual/DrawingPrintingiOS/GraphicsDrawingOverview/GraphicsDrawingOverview.html#//apple_ref/doc/uid/TP40010156-CH14-SW26
ctx.SaveState();
ctx.TranslateCTM(0, viewBounds.Height);
ctx.ScaleCTM(1, -1);
// draw the image
ctx.DrawImage(viewBounds, image);
ctx.RestoreState();
#elif __MACOS__
// draw the image
ctx.DrawImage(viewBounds, image);
#else
#error Plaform-specific code missing
#endif
}
}
protected virtual void OnChildRedraw(VisualElement view, SkiaSharp.SKSurface surface)
{
var viewRenderer = DoodlePlatform.GetDoodleRenderer(view);
viewRenderer.DrawView(surface);
}
