private void OnSave(object sender, RoutedEventArgs args)
{
args.Handled = true;
// show preview and wait for input
SaveGridDialog dialog = new SaveGridDialog()
{
Owner = this
};
dialog.VisualHost.VisualChild = CreateVisual(new PointD());
if (dialog.ShowDialog() != true)
{
return;
}
// ask user for PNG file name
string file = GetSaveFile();
if (String.IsNullOrEmpty(file))
{
return;
}
// grow by (1,1) to ensure all lines are fully visible
SizeD size = Grid.DisplayBounds.Size;
int width = Fortran.Ceiling(size.Width + 1),
height = Fortran.Ceiling(size.Height + 1);
// render grid to standard ARGB bitmap
RenderTargetBitmap bitmap = new RenderTargetBitmap(
width, height, 96, 96, PixelFormats.Pbgra32);
bitmap.Render(CreateVisual(new PointD()));
bitmap.Freeze();
try {
// encode bitmap as PNG file
PngBitmapEncoder encoder = new PngBitmapEncoder();
encoder.Interlace = PngInterlaceOption.Off;
encoder.Frames.Add(BitmapFrame.Create(bitmap));
using (FileStream stream = new FileStream(file, FileMode.Create))
encoder.Save(stream);
}
catch (Exception e) {
string message = String.Format(
"An error occurred while attempting\n" +
"to save the generated bitmap.\n\n{0}",
e.Message);
MessageBox.Show(this, message, "Save Grid Error",
MessageBoxButton.OK, MessageBoxImage.Error);
}
}
/// <summary>
/// Ensures that the <see cref="PaintBuffer"/> covers the specified minimum size.</summary>
/// <param name="required">
/// The new minimum size, in device-independent pixels, for the <see cref="PaintBuffer"/>.
/// </param>
/// <returns>
/// <c>true</c> if the <see cref="PaintBuffer"/> must be cleared by the caller; otherwise,
/// <c>false</c>.</returns>
/// <remarks>
/// To avoid frequent buffer reallocations, <b>EnsureBufferSize</b> grows the <see
/// cref="PaintBuffer"/> to cover twice its current area or to the specified <paramref
/// name="required"/> size, whichever is bigger. However, <b>EnsureBufferSize</b> will not
/// grow the <see cref="PaintBuffer"/> beyond the device-independent size of the current
/// virtual screen, unless the <paramref name="required"/> size is greater.</remarks>
private bool EnsureBufferSize(SizeI required)
{
int width, height;
SizeI estimate = required;
if (PaintBuffer != null)
{
width = PaintBuffer.PixelWidth;
height = PaintBuffer.PixelHeight;
// quit if existing buffer is large enough
if (width >= required.Width && height >= required.Height)
{
return(true);
}
// new estimate: double current buffer area
estimate = new SizeD(width * 1.4, height * 1.4).Round();
}
// default to virtual screen size
SizeI screen = new SizeI(
Fortran.Ceiling(SystemParameters.VirtualScreenWidth),
Fortran.Ceiling(SystemParameters.VirtualScreenHeight));
SizeI minimum = new SizeI(
Math.Min(screen.Width, estimate.Width),
Math.Min(screen.Height, estimate.Height));
// choose maximum of screen size or required size
width = Math.Max(minimum.Width, required.Width);
height = Math.Max(minimum.Height, required.Height);
// reallocate buffer with new size
PaintBuffer = new WriteableBitmap(width, height, 96, 96, PixelFormats.Pbgra32, null);
return(false);
}
public void Ceiling()
{
Assert.AreEqual(-3, Fortran.Ceiling(-3.4m));
Assert.AreEqual(-3, Fortran.Ceiling(-3.4d));
Assert.AreEqual(-3, Fortran.Ceiling(-3.4f));
}