private void refreshMagnifier()
{
Point center = MousePosition.GetValueOrDefault(new Point());
int radiusMagnifier = MagnifierRadius;
double zoom = MagnifierZoom;
if (!GetIsZoomEnabled())
{
magnfier.Visibility = Visibility.Collapsed;
return;
}
else
{
magnfier.Visibility = Visibility.Visible;
}
if (_currentBitmapData == null)
{
return;
}
int radius = (int)(radiusMagnifier / zoom);
Stopwatch st = new Stopwatch();
st.Start();
var bitmapScaled = Helper.GetZoomedVersionOfRegion(_currentBitmapData, getMagnifierRegion(center, radiusMagnifier, zoom), zoom, zoom);
var src = Helper.ImageSourceFromHBitmap(bitmapScaled);
magnifierImg.Source = src;
magnfier.RenderTransform = new MatrixTransform(1, 0, 0, 1, center.X - radiusMagnifier, center.Y - radiusMagnifier);
magnfier.Clip = new EllipseGeometry(new Point(radiusMagnifier, radiusMagnifier), radiusMagnifier, radiusMagnifier);
st.Stop();
System.Diagnostics.Debug.WriteLine("refreshing magnifier: " + st.ElapsedMilliseconds + " ms");
}
