private void Image_SizeChanged(object sender, SizeChangedEventArgs e)
{
var waterMarkP = WaterMarkContentControl.TranslatePoint(new Point(0, 0), ImageCanvas);
var backgroundP = BackgroundImage.TranslatePoint(new Point(0, 0), ImageCanvas);
var vector = waterMarkP - backgroundP;
var oldFactX = vector.X / e.PreviousSize.Width;
var oldFactY = vector.Y / e.PreviousSize.Height;
var diffX = e.NewSize.Width - e.PreviousSize.Width;
var diffY = e.NewSize.Height - e.PreviousSize.Height;
var factX = e.NewSize.Width / e.PreviousSize.Width;
var factY = e.NewSize.Height / e.PreviousSize.Height;
if (double.IsInfinity(factX) || double.IsInfinity(factY))
{
return;
}
WaterMarkContentControl.Width *= factX;
WaterMarkContentControl.Height *= factY;
var newX = backgroundP.X + e.NewSize.Width * oldFactX;
var newY = backgroundP.Y + e.NewSize.Height * oldFactY;
if (Math.Abs(backgroundP.Y) > 0.0001)
{
newY -= diffY * 1000 / 2000.0;
}
if (Math.Abs(backgroundP.X) > 0.0001)
{
newX -= diffX * 1000 / 2000.0;
}
if (newX <= ImageCanvas.ActualWidth && newX >= 0)
{
Canvas.SetLeft(WaterMarkContentControl, newX);
}
else
{
Canvas.SetLeft(WaterMarkContentControl, 0);
}
if (newY <= ImageCanvas.ActualHeight && newY >= 0)
{
Canvas.SetTop(WaterMarkContentControl, newY);
}
else
{
Canvas.SetTop(WaterMarkContentControl, 0);
}
}
private void ImageCanvas_SizeChanged(object sender, SizeChangedEventArgs e)
{
var waterMarkP = WaterMarkContentControl.TranslatePoint(new Point(0, 0), ImageCanvas);
var backgroundP = BackgroundImage.TranslatePoint(new Point(0, 0), ImageCanvas);
var diffX = e.NewSize.Width - e.PreviousSize.Width;
var diffY = e.NewSize.Height - e.PreviousSize.Height;
var newPosX = waterMarkP.X + diffX / 2.0;
var newPosY = waterMarkP.Y + diffY / 2.0;
if (backgroundP.X > 0 && Math.Abs(diffX) > 0.0001 && newPosX <= ImageCanvas.ActualWidth && newPosX >= 0)
{
Canvas.SetLeft(WaterMarkContentControl, newPosX);
}
if (backgroundP.Y > 0 && Math.Abs(diffY) > 0.0001 && newPosY <= ImageCanvas.ActualHeight && newPosY >= 0)
{
Canvas.SetTop(WaterMarkContentControl, newPosY);
}
}
