/// <summary>
/// Renders a page of the PDF document to the provided graphics instance.
/// </summary>
/// <param name="page">Number of the page to render.</param>
/// <param name="graphics">Graphics instance to render the page on.</param>
/// <param name="dpiX">Horizontal DPI.</param>
/// <param name="dpiY">Vertical DPI.</param>
/// <param name="bounds">Bounds to render the page in.</param>
/// <param name="fitToBounds">true to fit the rendered page into the specified bounds; otherwise false.</param>
/// <param name="stretchToBounds">true to stretch the rendered page into the specified bounds; otherwise false.</param>
/// <param name="keepAspectRatio">true to keep the original aspect ratio in tact; otherwise false.</param>
/// <param name="centerInBounds">true to center the page within the specified bounds; otherwise false.</param>
/// <param name="autoRotate">true to rotate the page depending on the specified bounds; otherwise false.</param>
public void Render(int page, Graphics graphics, float dpiX, float dpiY, Rectangle bounds, bool fitToBounds, bool stretchToBounds, bool keepAspectRatio, bool centerInBounds, bool autoRotate)
{
if (graphics == null)
{
throw new ArgumentNullException("graphics");
}
if (_disposed)
{
throw new ObjectDisposedException(GetType().Name);
}
float graphicsDpiX = graphics.DpiX;
float graphicsDpiY = graphics.DpiY;
var dc = graphics.GetHdc();
try
{
if ((int)graphicsDpiX != (int)dpiX || (int)graphicsDpiY != (int)dpiY)
{
var transform = new NativeMethods.XFORM
{
eM11 = graphicsDpiX / dpiX,
eM22 = graphicsDpiY / dpiY
};
NativeMethods.SetGraphicsMode(dc, NativeMethods.GM_ADVANCED);
NativeMethods.ModifyWorldTransform(dc, ref transform, NativeMethods.MWT_LEFTMULTIPLY);
}
bool success = _file.RenderPDFPageToDC(
page,
dc,
(int)dpiX, (int)dpiY,
bounds.X, bounds.Y, bounds.Width, bounds.Height,
fitToBounds,
stretchToBounds,
keepAspectRatio,
centerInBounds,
autoRotate
);
if (!success)
{
throw new Win32Exception();
}
}
finally
{
graphics.ReleaseHdc(dc);
}
}
