private void UpdateImageSourceForDpi(Image image)
{
string newImageUrl = ImageDpiHelper.GetDesiredImageUrlForDpi(image);
ImageDpiHelper.UpdateImageSource(image, newImageUrl);
textLabel.Text = newImageUrl + " for DPI of " + (/*VisualTreeHelper.GetDpi(image).PixelsPerDip **/ 100);
}
private void ScaleRightImage(DpiScaleInfo newDpi)
{
// update bestScale
bestScale = ImageDpiHelper.GetBestScale(newDpi.PixelsPerDip);
string imageUrl = ImageDpiHelper.GetDesiredImageUrlForDpi(this);
UpdateImageSource(this, imageUrl);
}
/// <summary>
/// Given an image, get its current DPI and choose the best source image to scale to that DPI.
/// </summary>
/// <param name="image">image element</param>
/// <returns>image URL for the most appropriate scale, given DPI</returns>
public static string GetDesiredImageUrlForDpi(Image image)
{
DpiScale imageScaleInfo = VisualTreeHelper.GetDpi(image);
int bestScale = ImageDpiHelper.GetBestScale(imageScaleInfo.PixelsPerDip);
var sourceUrl = image.Source.ToString();
string imagePattern = Regex.Replace(sourceUrl, ".scale-[0-9]{3}.", ".scale-{0}.");
string newImagePath = null;
if (imagePattern != null)
{
newImagePath = string.Format(imagePattern, bestScale);
}
return(newImagePath);
}