private void ButtonBase_OnClick(object sender, RoutedEventArgs e)
{
PixelRectangle.SetValue(Canvas.LeftProperty, 0d);
PixelRectangle.SetValue(Canvas.TopProperty, 0d);
PixelRectangle.Width = ImagePixelWidth;
PixelRectangle.Height = ImagePixelHeight;
DrawRectFromPixelRect();
}
private void UpdatePixelRect()
{
Point imageStartPoint = Grid.TranslatePoint(new Point(StartX, StartY), Image);
double pixelStartX = (imageStartPoint.X / Image.ActualWidth) * ImagePixelWidth;
double pixelStartY = (imageStartPoint.Y / Image.ActualHeight) * ImagePixelHeight;
double pixelWidth = (Rectangle.Width / Image.ActualWidth) * ImagePixelWidth;
double pixelHeight = (Rectangle.Height / Image.ActualHeight) * ImagePixelHeight;
PixelRectangle.SetValue(Canvas.LeftProperty, pixelStartX);
PixelRectangle.SetValue(Canvas.TopProperty, pixelStartY);
PixelRectangle.Width = pixelWidth;
PixelRectangle.Height = pixelHeight;
}