I have written a little game using IronPython and WPF for didactic purpose and now I want to translate the project to Metro APP for test Shared Projects.
The guilty code is:
def LoadImage(name, sourceRect):
bmp = BitmapImage()
bmp.BeginInit()
bmp.UriSource = Uri("./data/images/" + name, UriKind.Relative)
bmp.SourceRect = sourceRect
bmp.EndInit()
image = Image()
image.Source = bmp
return image
How on the earth I can obtain the same result in a Metro app (using C#)? There must be a way to do this in a simple manner like old BitmapImage. I need this because I have tiled images and I want a portion of it to display. WriteableBitmap work but ignore transparency of the image, so it's useless.
I've been using this code to load an image scaled:
public static async Task SetSourceAsync(
this WriteableBitmap writeableBitmap,
IRandomAccessStream streamSource,
uint decodePixelWidth,
uint decodePixelHeight)
{
var decoder = await BitmapDecoder.CreateAsync(streamSource);
using (var inMemoryStream = new InMemoryRandomAccessStream())
{
var encoder = await BitmapEncoder.CreateForTranscodingAsync(inMemoryStream, decoder);
encoder.BitmapTransform.ScaledWidth = decodePixelWidth;
encoder.BitmapTransform.ScaledHeight = decodePixelHeight;
await encoder.FlushAsync();
inMemoryStream.Seek(0);
await writeableBitmap.SetSourceAsync(inMemoryStream);
}
}
You might use something similar, but you'd specify encoder.BitmapTransform.Bounds
instead of ScaledWidth/Height
to do the cropping. If you have more specific questions - please clarify.