public static BitmapSource DrawFaces(BitmapSource baseImage, FaceAPI.Face[] faces, EmotionScores[] emotionScores, string[] celebName)
{
if (faces == null)
{
return(baseImage);
}
Action <DrawingContext, double> drawAction = (drawingContext, annotationScale) => {
for (int i = 0; i < faces.Length; i++)
{
var face = faces[i];
if (face.FaceRectangle == null)
{
continue;
}
Rect faceRect = new Rect(
face.FaceRectangle.Left, face.FaceRectangle.Top,
face.FaceRectangle.Width, face.FaceRectangle.Height);
string text = "";
if (face.FaceAttributes != null)
{
text += Aggregation.SummarizeFaceAttributes(face.FaceAttributes);
}
if (emotionScores?[i] != null)
{
text += Aggregation.SummarizeEmotion(emotionScores[i]);
}
if (celebName?[i] != null)
{
text += celebName[i];
}
faceRect.Inflate(6 * annotationScale, 6 * annotationScale);
double lineThickness = 4 * annotationScale;
drawingContext.DrawRectangle(
Brushes.Transparent,
new Pen(s_lineBrush, lineThickness),
faceRect);
if (text != "")
{
FormattedText ft = new FormattedText(text,
CultureInfo.CurrentCulture, FlowDirection.LeftToRight, s_typeface,
16 * annotationScale, Brushes.Black);
var pad = 3 * annotationScale;
var ypad = pad;
var xpad = pad + 4 * annotationScale;
var origin = new System.Windows.Point(
faceRect.Left + xpad - lineThickness / 2,
faceRect.Top - ft.Height - ypad + lineThickness / 2);
var rect = ft.BuildHighlightGeometry(origin).GetRenderBounds(null);
rect.Inflate(xpad, ypad);
drawingContext.DrawRectangle(s_lineBrush, null, rect);
drawingContext.DrawText(ft, origin);
}
}
};
return(DrawOverlay(baseImage, drawAction));
}
public static string SummarizeEmotion(EmotionScores scores)
{
var bestEmotion = Aggregation.GetDominantEmotion(scores);
return(string.Format("{0}: {1:N1}", bestEmotion.Item1, bestEmotion.Item2));
}