private void VisualImage_Unloaded(object sender, RoutedEventArgs e)
{
try
{
ElementCompositionPreview.SetElementChildVisual(this, null);
_backgroundBrush?.Dispose();
//_foregroundBrush?.Dispose();
BackgroundVisual?.Dispose();
ForegroundVisual?.Dispose();
ContainerVisual?.Dispose();
//_uriSurface?.Dispose();
_opacityAnimation?.Dispose();
}
catch
{
// ignored
}
}
private void RenderBackground()
{
using (DrawingContext dc = BackgroundVisual.RenderOpen())
{
GuidelineSet guidelines = new GuidelineSet();
guidelines.GuidelinesX.Add(0.0);
guidelines.GuidelinesY.Add(0.0);
dc.PushGuidelineSet(guidelines);
dc.DrawRectangle(Brushes.White, null, new Rect(new Size(Width, Height)));
if (IsGridVisible)
{
for (double x = GridSize; x < Width; x += GridSize)
{
Pen pen = new Pen(Brushes.LightBlue, 1.0d);
if (x % (5 * GridSize) == 0)
{
pen = new Pen(Brushes.LightGray, 1.5d);
}
dc.DrawLine(pen, new Point(x, 0), new Point(x, Height));
}
for (double y = GridSize; y < Height; y += GridSize)
{
Pen pen = new Pen(Brushes.LightBlue, 1.0d);
if (y % (5 * GridSize) == 0)
{
pen = new Pen(Brushes.LightGray, 1.5d);
}
dc.DrawLine(pen, new Point(0, y), new Point(Width, y));
}
}
dc.Pop();
}
}
