private void DrawRectFromPixelRect()
{
if (PixelRectangle.Width == 0 || PixelRectangle.Height == 0)
{
Rectangle.Width = 0;
Rectangle.Height = 0;
return;
}
//Get Size in relation to current image size
double?pixelX = PixelRectangle.GetValue(Canvas.LeftProperty) as double?;
double?pixelY = PixelRectangle.GetValue(Canvas.TopProperty) as double?;
if (!pixelX.HasValue || !pixelY.HasValue)
{
return;
}
Point imagePoint = Image.TranslatePoint(new Point(0, 0), Grid);
double pixelWidth = PixelRectangle.Width;
double pixelHeight = PixelRectangle.Height;
double screenX = ((pixelX.Value / ImagePixelWidth) * Image.ActualWidth) + imagePoint.X;
double screenY = ((pixelY.Value / ImagePixelHeight) * Image.ActualHeight) + imagePoint.Y;
double screenWidth = (pixelWidth / ImagePixelWidth) * Image.ActualWidth;
double screenHeight = (pixelHeight / ImagePixelHeight) * Image.ActualHeight;
Rectangle.SetValue(Canvas.LeftProperty, screenX);
Rectangle.SetValue(Canvas.TopProperty, screenY);
Rectangle.Width = screenWidth;
Rectangle.Height = screenHeight;
}
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;
}
