/// <summary>
/// 将指定的页码显示出现
/// </summary>
/// <param name="page">要呈现的页码</param>
/// <param name="graphics"></param>
/// <param name="dpiX"></param>
/// <param name="dpiY"></param>
/// <param name="bounds"></param>
public override void Render(int page, Graphics graphics, float dpiX, float dpiY, Rectangle bounds)
{
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,
true /* fitToBounds */,
true /* stretchToBounds */,
true /* keepAspectRatio */,
true /* centerInBounds */,
true /* autoRotate */
);
if (!success)
{
throw new Win32Exception();
}
}
finally
{
graphics.ReleaseHdc(dc);
}
}
internal static extern int AddStroke([In] ContextSafeHandle hRecContext, [In] ref PACKET_DESCRIPTION packetDesc, [In] uint cbPackets, [In] IntPtr pByte, [In, MarshalAs(UnmanagedType.LPStruct)] NativeMethods.XFORM xForm);
/// <summary>
/// Retrieve the packet description, packets data and XFORM which is the information the native recognizer needs.
/// The method is called from AddStrokes.
/// </summary>
private void GetPacketData
(
Stroke stroke,
out MS.Win32.Recognizer.PACKET_DESCRIPTION packetDescription,
out int countOfBytes,
out IntPtr packets,
out NativeMethods.XFORM xForm
)
{
int i;
countOfBytes = 0;
packets = IntPtr.Zero;
packetDescription = new MS.Win32.Recognizer.PACKET_DESCRIPTION();
Matrix matrix = Matrix.Identity;
xForm = new NativeMethods.XFORM((float)(matrix.M11), (float)(matrix.M12), (float)(matrix.M21),
(float)(matrix.M22), (float)(matrix.OffsetX), (float)(matrix.OffsetY));
StylusPointCollection stylusPoints = stroke.StylusPoints;
if (stylusPoints.Count == 0)
{
return; //we'll fail when the calling routine sees that packets is IntPtr.Zer
}
if (stylusPoints.Description.PropertyCount > StylusPointDescription.RequiredCountOfProperties)
{
//
// reformat to X, Y, P
//
StylusPointDescription reformatDescription
= new StylusPointDescription(
new StylusPointPropertyInfo[] {
new StylusPointPropertyInfo(StylusPointProperties.X),
new StylusPointPropertyInfo(StylusPointProperties.Y),
stylusPoints.Description.GetPropertyInfo(StylusPointProperties.NormalPressure)
});
stylusPoints = stylusPoints.Reformat(reformatDescription);
}
//
// now make sure we only take a finite amount of data for the stroke
//
if (stylusPoints.Count > MaxStylusPoints)
{
stylusPoints = stylusPoints.Clone(MaxStylusPoints);
}
Guid[] propertyGuids = new Guid[] { StylusPointPropertyIds.X, //required index for SPD
StylusPointPropertyIds.Y, //required index for SPD
StylusPointPropertyIds.NormalPressure }; //required index for SPD
Debug.Assert(stylusPoints != null);
Debug.Assert(propertyGuids.Length == StylusPointDescription.RequiredCountOfProperties);
// Get the packet description
packetDescription.cbPacketSize = (uint)(propertyGuids.Length * Marshal.SizeOf(typeof(Int32)));
packetDescription.cPacketProperties = (uint)propertyGuids.Length;
//
// use X, Y defaults for metrics, sometimes mouse metrics can be bogus
// always use NormalPressure metrics, though.
//
StylusPointPropertyInfo[] infosToUse = new StylusPointPropertyInfo[StylusPointDescription.RequiredCountOfProperties];
infosToUse[StylusPointDescription.RequiredXIndex] = StylusPointPropertyInfoDefaults.X;
infosToUse[StylusPointDescription.RequiredYIndex] = StylusPointPropertyInfoDefaults.Y;
infosToUse[StylusPointDescription.RequiredPressureIndex] =
stylusPoints.Description.GetPropertyInfo(StylusPointProperties.NormalPressure);
MS.Win32.Recognizer.PACKET_PROPERTY[] packetProperties =
new MS.Win32.Recognizer.PACKET_PROPERTY[packetDescription.cPacketProperties];
StylusPointPropertyInfo propertyInfo;
for (i = 0; i < packetDescription.cPacketProperties; i++)
{
packetProperties[i].guid = propertyGuids[i];
propertyInfo = infosToUse[i];
MS.Win32.Recognizer.PROPERTY_METRICS propertyMetrics = new MS.Win32.Recognizer.PROPERTY_METRICS( );
propertyMetrics.nLogicalMin = propertyInfo.Minimum;
propertyMetrics.nLogicalMax = propertyInfo.Maximum;
propertyMetrics.Units = (int)(propertyInfo.Unit);
propertyMetrics.fResolution = propertyInfo.Resolution;
packetProperties[i].PropertyMetrics = propertyMetrics;
}
unsafe
{
int allocationSize = (int)(Marshal.SizeOf(typeof(MS.Win32.Recognizer.PACKET_PROPERTY)) * packetDescription.cPacketProperties);
packetDescription.pPacketProperties = Marshal.AllocCoTaskMem(allocationSize);
MS.Win32.Recognizer.PACKET_PROPERTY *pPacketProperty =
(MS.Win32.Recognizer.PACKET_PROPERTY *)(packetDescription.pPacketProperties.ToPointer());
MS.Win32.Recognizer.PACKET_PROPERTY *pElement = pPacketProperty;
for (i = 0; i < packetDescription.cPacketProperties; i++)
{
Marshal.StructureToPtr(packetProperties[i], new IntPtr(pElement), false);
pElement++;
}
}
// Get packet data
int[] rawPackets = stylusPoints.ToHiMetricArray();
int packetCount = rawPackets.Length;
if (packetCount != 0)
{
countOfBytes = packetCount * Marshal.SizeOf(typeof(Int32));
packets = Marshal.AllocCoTaskMem(countOfBytes);
Marshal.Copy(rawPackets, 0, packets, packetCount);
}
}
internal Hdc(Graphics graphics)
{
this.graphics = graphics;
NativeMethods.XFORM xform = new NativeMethods.XFORM(this.graphics.Transform);
this.hdc = new HandleRef(this, this.graphics.GetHdc());
//If the function fails, the return value is zero
this.oldGraphicsMode = NativeMethods.SetGraphicsMode(this.hdc, NativeMethods.GM_ADVANCED);
if (this.oldGraphicsMode == 0)
throw new Win32Exception(Marshal.GetLastWin32Error());
//If the function fails, the return value is zero.
int result = NativeMethods.SetWorldTransform(this.hdc, xform);
if (result == 0)
throw new Win32Exception(Marshal.GetLastWin32Error());
IntPtr handle = NativeMethods.GetCurrentObject(this.hdc, NativeMethods.OBJ_PEN);
if (handle == IntPtr.Zero)
throw new Win32Exception(Marshal.GetLastWin32Error());
this.oldPen = new HandleRef(this, handle);
handle = NativeMethods.GetCurrentObject(this.hdc, NativeMethods.OBJ_EXTPEN);
if (handle == IntPtr.Zero)
throw new Win32Exception(Marshal.GetLastWin32Error());
this.oldPenEx = new HandleRef(this, handle);
handle = NativeMethods.GetCurrentObject(this.hdc, NativeMethods.OBJ_BRUSH);
if (handle == IntPtr.Zero)
throw new Win32Exception(Marshal.GetLastWin32Error());
this.oldBrush = new HandleRef(this, handle);
}
/// <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="flags">Flags used to influence the rendering.</param>
public void Render(int page, Graphics graphics, float dpiX, float dpiY, Rectangle bounds, PdfRenderFlags flags)
{
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);
}
var point = new NativeMethods.POINT();
NativeMethods.SetViewportOrgEx(dc, bounds.X, bounds.Y, out point);
bool success = _file.RenderPDFPageToDC(
page,
dc,
(int)dpiX, (int)dpiY,
0, 0, bounds.Width, bounds.Height,
FlagsToFPDFFlags(flags)
);
NativeMethods.SetViewportOrgEx(dc, point.X, point.Y, out point);
if (!success)
throw new Win32Exception();
}
finally
{
graphics.ReleaseHdc(dc);
}
}
