public static IPrintDocumentSource Print(Win2DScene scene, float padding)
{
Guard.NotNull(scene, nameof(scene));
Guard.GreaterThan(padding, 0, nameof(padding));
var printDocument = new CanvasPrintDocument();
var sceneBounds = scene.RenderBounds;
Action <CanvasDrawingSession, PrintPageDescription> renderForPrint = (session, page) =>
{
session.Clear(Colors.White);
var size = page.PageSize.ToVector2();
var ratio = sceneBounds.Width / sceneBounds.Height;
var targetSizeX = Math.Min(size.X - (2 * padding), sceneBounds.Width);
var targetSizeY = targetSizeX / ratio;
if (targetSizeY > page.PageSize.Height)
{
targetSizeY = Math.Min(size.Y - (2 * padding), sceneBounds.Height);
targetSizeX = targetSizeY * ratio;
}
var zoom = targetSizeX / sceneBounds.Width;
session.Transform =
Matrix3x2.CreateTranslation(
-sceneBounds.Position.X,
-sceneBounds.Position.Y) *
Matrix3x2.CreateScale(zoom) *
Matrix3x2.CreateTranslation(
0.5f * (size.X - targetSizeX),
0.5f * (size.Y - targetSizeY));
scene.Render(session, false, Rect2.Infinite);
};
printDocument.Preview += (sender, args) =>
{
sender.SetPageCount(1);
renderForPrint(args.DrawingSession, args.PrintTaskOptions.GetPageDescription(1));
};
printDocument.Print += (sender, args) =>
{
using (var session = args.CreateDrawingSession())
{
renderForPrint(session, args.PrintTaskOptions.GetPageDescription(1));
}
};
return(printDocument);
}
public static async Task RenderScreenshotAsync(Win2DScene scene, ICanvasResourceCreator device, Stream stream, Vector3 background, float?dpi = null, float padding = 20)
{
Guard.NotNull(scene, nameof(scene));
Guard.NotNull(stream, nameof(stream));
Guard.NotNull(device, nameof(device));
Guard.GreaterThan(padding, 0, nameof(padding));
var sceneBounds = scene.RenderBounds;
var w = sceneBounds.Size.X + (2 * padding);
var h = sceneBounds.Size.Y + (2 * padding);
var dpiValue = dpi ?? DisplayInformation.GetForCurrentView().LogicalDpi;
var dpiFactor = dpiValue / DpiWithPixelMapping;
var wPixels = (int)(w * dpiFactor);
var hPixels = (int)(h * dpiFactor);
var maxPixels = Math.Min(MaxSize, device.Device.MaximumBitmapSizeInPixels - 100);
var wDiff = wPixels - maxPixels;
var hDiff = hPixels - maxPixels;
if (wDiff > 0 || hDiff > 0)
{
if (wDiff > hDiff)
{
dpiValue = (int)(dpiValue * ((float)maxPixels / wPixels));
}
else
{
dpiValue = (int)(dpiValue * ((float)maxPixels / hPixels));
}
}
using (var target = new CanvasRenderTarget(device, w, h, dpiValue))
{
using (var session = target.CreateDrawingSession())
{
session.Clear(background.ToColor());
session.Transform =
Matrix3x2.CreateTranslation(
-sceneBounds.Position.X + padding,
-sceneBounds.Position.Y + padding);
scene.Render(session, false, Rect2.Infinite);
}
await target.SaveAsync(stream.AsRandomAccessStream(), CanvasBitmapFileFormat.Png).AsTask();
}
}
