/// <summary>
/// Implements StartEnd for generating print preview information.
/// </summary>
public override Graphics OnStartPage(PrintDocument document, PrintPageEventArgs e)
{
base.OnStartPage(document, e);
if (e.CopySettingsToDevMode)
{
e.PageSettings.CopyToHdevmode(_modeHandle);
}
Size size = e.PageBounds.Size;
// Metafile framing rectangles apparently use hundredths of mm as their unit of measurement,
// instead of the GDI+ standard hundredth of an inch.
Size metafileSize = PrinterUnitConvert.Convert(size, PrinterUnit.Display, PrinterUnit.HundredthsOfAMillimeter);
// Create a Metafile which accepts only GDI+ commands since we are the ones creating
// and using this ...
// Framework creates a dual-mode EMF for each page in the preview.
// When these images are displayed in preview,
// they are added to the dual-mode EMF. However,
// GDI+ breaks during this process if the image
// is sufficiently large and has more than 254 colors.
// This code path can easily be avoided by requesting
// an EmfPlusOnly EMF..
Metafile metafile = new Metafile(_dc.Hdc, new Rectangle(0, 0, metafileSize.Width, metafileSize.Height), MetafileFrameUnit.GdiCompatible, EmfType.EmfPlusOnly);
PreviewPageInfo info = new PreviewPageInfo(metafile, size);
_list.Add(info);
PrintPreviewGraphics printGraphics = new PrintPreviewGraphics(document, e);
_graphics = Graphics.FromImage(metafile);
if (_graphics != null && document.OriginAtMargins)
{
// Adjust the origin of the graphics object to be at the
// user-specified margin location
int dpiX = UnsafeNativeMethods.GetDeviceCaps(new HandleRef(_dc, _dc.Hdc), SafeNativeMethods.LOGPIXELSX);
int dpiY = UnsafeNativeMethods.GetDeviceCaps(new HandleRef(_dc, _dc.Hdc), SafeNativeMethods.LOGPIXELSY);
int hardMarginX_DU = UnsafeNativeMethods.GetDeviceCaps(new HandleRef(_dc, _dc.Hdc), SafeNativeMethods.PHYSICALOFFSETX);
int hardMarginY_DU = UnsafeNativeMethods.GetDeviceCaps(new HandleRef(_dc, _dc.Hdc), SafeNativeMethods.PHYSICALOFFSETY);
float hardMarginX = hardMarginX_DU * 100 / dpiX;
float hardMarginY = hardMarginY_DU * 100 / dpiY;
_graphics.TranslateTransform(-hardMarginX, -hardMarginY);
_graphics.TranslateTransform(document.DefaultPageSettings.Margins.Left, document.DefaultPageSettings.Margins.Top);
}
_graphics.PrintingHelper = printGraphics;
if (UseAntiAlias)
{
_graphics.TextRenderingHint = TextRenderingHint.AntiAlias;
_graphics.SmoothingMode = SmoothingMode.AntiAlias;
}
return(_graphics);
}
public override Graphics OnStartPage(PrintDocument document, PrintPageEventArgs e)
{
this.CheckSecurity();
base.OnStartPage(document, e);
try
{
IntSecurity.AllPrintingAndUnmanagedCode.Assert();
e.PageSettings.CopyToHdevmode((IntPtr)base.modeHandle);
Size size = e.PageBounds.Size;
Size size2 = PrinterUnitConvert.Convert(size, PrinterUnit.Display, PrinterUnit.HundredthsOfAMillimeter);
Metafile image = new Metafile(this.dc.Hdc, new Rectangle(0, 0, size2.Width, size2.Height), MetafileFrameUnit.GdiCompatible, EmfType.EmfPlusOnly);
PreviewPageInfo info = new PreviewPageInfo(image, size);
this.list.Add(info);
PrintPreviewGraphics graphics = new PrintPreviewGraphics(document, e);
this.graphics = Graphics.FromImage(image);
if ((this.graphics != null) && document.OriginAtMargins)
{
int deviceCaps = UnsafeNativeMethods.GetDeviceCaps(new HandleRef(this.dc, this.dc.Hdc), 0x58);
int num2 = UnsafeNativeMethods.GetDeviceCaps(new HandleRef(this.dc, this.dc.Hdc), 90);
int num3 = UnsafeNativeMethods.GetDeviceCaps(new HandleRef(this.dc, this.dc.Hdc), 0x70);
int num4 = UnsafeNativeMethods.GetDeviceCaps(new HandleRef(this.dc, this.dc.Hdc), 0x71);
float num5 = (num3 * 100) / deviceCaps;
float num6 = (num4 * 100) / num2;
this.graphics.TranslateTransform(-num5, -num6);
this.graphics.TranslateTransform((float)document.DefaultPageSettings.Margins.Left, (float)document.DefaultPageSettings.Margins.Top);
}
this.graphics.PrintingHelper = graphics;
if (this.antiAlias)
{
this.graphics.TextRenderingHint = TextRenderingHint.AntiAlias;
this.graphics.SmoothingMode = SmoothingMode.AntiAlias;
}
}
finally
{
CodeAccessPermission.RevertAssert();
}
return(this.graphics);
}