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Georgy Khatuncev
2021-05-25 17:00:45 +05:00
parent e2fcfed44c
commit ec2dac13d8
1172 changed files with 5636 additions and 5839 deletions
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PrintPDF/PdfSharp/Drawing/InternalGraphicsState.cs Normal file
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#region PDFsharp - A .NET library for processing PDF
//
// Authors:
// Stefan Lange
//
// Copyright (c) 2005-2017 empira Software GmbH, Cologne Area (Germany)
//
// http://www.pdfsharp.com
// http://sourceforge.net/projects/pdfsharp
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
#endregion
#if GDI
using System.Drawing;
using System.Drawing.Drawing2D;
#endif
#if WPF
using System.Windows.Media;
#endif
namespace PdfSharp.Drawing
{
// In GDI+ the functions Save/Restore, BeginContainer/EndContainer, Transform, SetClip and ResetClip
// can be combined in any order. E.g. you can set a clip region, save the graphics state, empty the
// clip region and draw without clipping. Then you can restore to the previous clip region. With PDF
// this behavior is hard to implement. To solve this problem I first an automaton that keeps track
// of all clipping paths and the current transformation when the clip path was set. The automation
// manages a PDF graphics state stack to calculate the desired bahaviour. It also takes into consideration
// not to multiply with inverse matrixes when the user sets a new transformation matrix.
// After the design works on pager I decided not to implement it because it is much to large-scale.
// Instead I lay down some rules how to use the XGraphics class.
//
// * Before you set a transformation matrix save the graphics state (Save) or begin a new container
// (BeginContainer).
//
// * Instead of resetting the transformation matrix, call Restore or EndContainer. If you reset the
// transformation, in PDF must be multiplied with the inverse matrix. That leads to round off errors
// because in PDF file only 3 digits are used and Acrobat internally uses fixed point numbers (until
// versioin 6 or 7 I think).
//
// * When no clip path is defined, you can set or intersect a new path.
//
// * When a clip path is already defined, you can always intersect with a new one (wich leads in general
// to a smaller clip region).
//
// * When a clip path is already defined, you can only reset it to the empty region (ResetClip) when
// the graphics state stack is at the same position as it had when the clip path was defined. Otherwise
// an error occurs.
//
// Keeping these rules leads to easy to read code and best results in PDF output.
/// <summary>
/// Represents the internal state of an XGraphics object.
/// Used when the state is saved and restored.
/// </summary>
internal class InternalGraphicsState
{
public InternalGraphicsState(XGraphics gfx)
{
_gfx = gfx;
}
public InternalGraphicsState(XGraphics gfx, XGraphicsState state)
{
_gfx = gfx;
State = state;
State.InternalState = this;
}
public InternalGraphicsState(XGraphics gfx, XGraphicsContainer container)
{
_gfx = gfx;
container.InternalState = this;
}
/// <summary>
/// Gets or sets the current transformation matrix.
/// </summary>
public XMatrix Transform
{
get { return _transform; }
set { _transform = value; }
}
XMatrix _transform;
/// <summary>
/// Called after this instanced was pushed on the internal graphics stack.
/// </summary>
public void Pushed()
{
#if GDI
// Nothing to do.
#endif
#if WPF && !SILVERLIGHT
// Nothing to do.
#endif
#if SILVERLIGHT
// Save current level of Canvas stack.
_stackLevel = _gfx._dc.Level;
// Create new Canvas for subsequent UIElements.
_gfx._dc.PushCanvas();
#endif
}
/// <summary>
/// Called after this instanced was popped from the internal graphics stack.
/// </summary>
public void Popped()
{
Invalid = true;
#if GDI
// Nothing to do.
#endif
#if WPF && !SILVERLIGHT
// Pop all objects pushed in this state.
if (_gfx.TargetContext == XGraphicTargetContext.WPF)
{
for (int idx = 0; idx < _transformPushLevel; idx++)
_gfx._dc.Pop();
_transformPushLevel = 0;
for (int idx = 0; idx < _geometryPushLevel; idx++)
_gfx._dc.Pop();
_geometryPushLevel = 0;
}
#endif
#if SILVERLIGHT
// Pop all Canvas objects created in this state.
_gfx._dc.Pop(_gfx._dc.Level - _stackLevel);
#endif
}
public bool Invalid;
#if GDI_
/// <summary>
/// The GDI+ GraphicsState if contructed from XGraphicsState.
/// </summary>
public GraphicsState GdiGraphicsState;
#endif
#if WPF && !SILVERLIGHT
public void PushTransform(MatrixTransform transform)
{
_gfx._dc.PushTransform(transform);
_transformPushLevel++;
}
int _transformPushLevel;
public void PushClip(Geometry geometry)
{
_gfx._dc.PushClip(geometry);
_geometryPushLevel++;
}
int _geometryPushLevel;
#endif
#if SILVERLIGHT
public void PushTransform(MatrixTransform transform)
{
_gfx._dc.PushTransform(transform);
}
public void PushClip(Geometry geometry)
{
_gfx._dc.PushClip(geometry);
}
int _stackLevel;
#endif
readonly XGraphics _gfx;
internal XGraphicsState State;
}
}