private void DrawFormattedText(DpiScaleInfo dpiInfo)
{
FormattedText formattedText = new FormattedText(
"FABLE",
new System.Globalization.CultureInfo("en-US"),
FlowDirection.LeftToRight,
new Typeface(
new System.Windows.Media.FontFamily("Segoe UI"),
FontStyles.Normal,
FontWeights.Bold,
FontStretches.Normal),
120,
System.Windows.Media.Brushes.Red,
dpiInfo.PixelsPerDip);
// Build a geometry out of the text.
Geometry geometry = new PathGeometry();
geometry = formattedText.BuildGeometry(new System.Windows.Point(0, 0));
// Adjust the geometry to fit the aspect ration of the video by scaling it.
ScaleTransform myScaleTransform = new ScaleTransform();
myScaleTransform.ScaleX = .85;
myScaleTransform.ScaleY = 2.0;
geometry.Transform = myScaleTransform;
// Flatten the geometry and create a PathGeometry out of it.
PathGeometry pathGeometry = new PathGeometry();
pathGeometry = geometry.GetFlattenedPathGeometry();
// Use the PathGeometry for the empty placeholder Path element in XAML.
path.Data = pathGeometry;
// Use the PathGeometry for the animated ball that follows the path of the text outline.
matrixAnimation.PathGeometry = pathGeometry;
}
private void ScaleRightImage(DpiScaleInfo newDpi)
{
// update bestScale
bestScale = ImageDpiHelper.GetBestScale(newDpi.PixelsPerDip);
string imageUrl = ImageDpiHelper.GetDesiredImageUrlForDpi(this);
UpdateImageSource(this, imageUrl);
}
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)
{
DpiScaleInfo 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);
}
private void DrawFormattedText(DpiScaleInfo dpiInfo)
{
FormattedText formattedText = new FormattedText(
"FABLE",
new System.Globalization.CultureInfo("en-US"),
FlowDirection.LeftToRight,
new Typeface(
new System.Windows.Media.FontFamily("Segoe UI"),
FontStyles.Normal,
FontWeights.Bold,
FontStretches.Normal),
120,
System.Windows.Media.Brushes.Red,
dpiInfo.PixelsPerDip);
// Build a geometry out of the text.
Geometry geometry = new PathGeometry();
geometry = formattedText.BuildGeometry(new System.Windows.Point(0, 0));
// Adjust the geometry to fit the aspect ration of the video by scaling it.
ScaleTransform myScaleTransform = new ScaleTransform();
myScaleTransform.ScaleX = .85;
myScaleTransform.ScaleY = 2.0;
geometry.Transform = myScaleTransform;
// Flatten the geometry and create a PathGeometry out of it.
PathGeometry pathGeometry = new PathGeometry();
pathGeometry = geometry.GetFlattenedPathGeometry();
// Use the PathGeometry for the empty placeholder Path element in XAML.
path.Data = pathGeometry;
// Use the PathGeometry for the animated ball that follows the path of the text outline.
matrixAnimation.PathGeometry = pathGeometry;
}
// when DPI changes, ensure we are using the right scaled image, based on the DPI.
protected override void OnDpiChanged(DpiScaleInfo oldDpi, DpiScaleInfo newDpi)
{
ScaleRightImage(newDpi);
}
// on initial load, ensure we are using the right scaled image, based on the DPI.
private void DpiAwareImage_Initialized(object sender, EventArgs e)
{
DpiScaleInfo newDpi = VisualTreeHelper.GetDpi(sender as Visual);
ScaleRightImage(newDpi);
}
// when DPI changes, ensure we are using the right scaled image, based on the DPI.
protected override void OnDpiChanged(DpiScaleInfo oldDpi, DpiScaleInfo newDpi)
{
ScaleRightImage(newDpi);
}
protected override void OnDpiChanged(DpiScaleInfo oldDpiScaleInfo, DpiScaleInfo newDpiScaleInfo)
{
DrawFormattedText(newDpiScaleInfo);
}
protected override void OnDpiChanged(DpiScaleInfo oldDpiScaleInfo, DpiScaleInfo newDpiScaleInfo)
{
DrawFormattedText(newDpiScaleInfo);
}
protected override void OnDpiChanged(DpiScaleInfo oldDpiScaleInfo, DpiScaleInfo newDpiScaleInfo)
{
_pixelsPerDip = newDpiScaleInfo.PixelsPerDip;
UpdateFormattedText(_pixelsPerDip);
}
protected override void OnDpiChanged(DpiScaleInfo oldDpiScaleInfo, DpiScaleInfo newDpiScaleInfo)
{
_pixelsPerDip = newDpiScaleInfo.PixelsPerDip;
UpdateFormattedText(_pixelsPerDip);
}
