00001 // $Id: pathstrk.h 1282 2006-06-09 09:46:49Z alex $ 00002 /* @@tag:xara-cn@@ DO NOT MODIFY THIS LINE 00003 ================================XARAHEADERSTART=========================== 00004 00005 Xara LX, a vector drawing and manipulation program. 00006 Copyright (C) 1993-2006 Xara Group Ltd. 00007 Copyright on certain contributions may be held in joint with their 00008 respective authors. See AUTHORS file for details. 00009 00010 LICENSE TO USE AND MODIFY SOFTWARE 00011 ---------------------------------- 00012 00013 This file is part of Xara LX. 00014 00015 Xara LX is free software; you can redistribute it and/or modify it 00016 under the terms of the GNU General Public License version 2 as published 00017 by the Free Software Foundation. 00018 00019 Xara LX and its component source files are distributed in the hope 00020 that it will be useful, but WITHOUT ANY WARRANTY; without even the 00021 implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 00022 See the GNU General Public License for more details. 00023 00024 You should have received a copy of the GNU General Public License along 00025 with Xara LX (see the file GPL in the root directory of the 00026 distribution); if not, write to the Free Software Foundation, Inc., 51 00027 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 00028 00029 00030 ADDITIONAL RIGHTS 00031 ----------------- 00032 00033 Conditional upon your continuing compliance with the GNU General Public 00034 License described above, Xara Group Ltd grants to you certain additional 00035 rights. 00036 00037 The additional rights are to use, modify, and distribute the software 00038 together with the wxWidgets library, the wxXtra library, and the "CDraw" 00039 library and any other such library that any version of Xara LX relased 00040 by Xara Group Ltd requires in order to compile and execute, including 00041 the static linking of that library to XaraLX. In the case of the 00042 "CDraw" library, you may satisfy obligation under the GNU General Public 00043 License to provide source code by providing a binary copy of the library 00044 concerned and a copy of the license accompanying it. 00045 00046 Nothing in this section restricts any of the rights you have under 00047 the GNU General Public License. 00048 00049 00050 SCOPE OF LICENSE 00051 ---------------- 00052 00053 This license applies to this program (XaraLX) and its constituent source 00054 files only, and does not necessarily apply to other Xara products which may 00055 in part share the same code base, and are subject to their own licensing 00056 terms. 00057 00058 This license does not apply to files in the wxXtra directory, which 00059 are built into a separate library, and are subject to the wxWindows 00060 license contained within that directory in the file "WXXTRA-LICENSE". 00061 00062 This license does not apply to the binary libraries (if any) within 00063 the "libs" directory, which are subject to a separate license contained 00064 within that directory in the file "LIBS-LICENSE". 00065 00066 00067 ARRANGEMENTS FOR CONTRIBUTION OF MODIFICATIONS 00068 ---------------------------------------------- 00069 00070 Subject to the terms of the GNU Public License (see above), you are 00071 free to do whatever you like with your modifications. However, you may 00072 (at your option) wish contribute them to Xara's source tree. You can 00073 find details of how to do this at: 00074 http://www.xaraxtreme.org/developers/ 00075 00076 Prior to contributing your modifications, you will need to complete our 00077 contributor agreement. This can be found at: 00078 http://www.xaraxtreme.org/developers/contribute/ 00079 00080 Please note that Xara will not accept modifications which modify any of 00081 the text between the start and end of this header (marked 00082 XARAHEADERSTART and XARAHEADEREND). 00083 00084 00085 MARKS 00086 ----- 00087 00088 Xara, Xara LX, Xara X, Xara X/Xtreme, Xara Xtreme, the Xtreme and Xara 00089 designs are registered or unregistered trademarks, design-marks, and/or 00090 service marks of Xara Group Ltd. All rights in these marks are reserved. 00091 00092 00093 Xara Group Ltd, Gaddesden Place, Hemel Hempstead, HP2 6EX, UK. 00094 http://www.xara.com/ 00095 00096 =================================XARAHEADEREND============================ 00097 */ 00098 // Definition of Path Stroking classes (used in stroke providing) 00099 00100 #ifndef INC_PATHSTRK 00101 #define INC_PATHSTRK 00102 00103 #include "pathtrap.h" 00104 //#include "attr.h" - in camtypes.h [AUTOMATICALLY REMOVED] 00105 00106 #include "strkcomp.h" 00107 00108 class DocCoord; 00109 class ValueFunction; 00110 class Node; 00111 00112 00114 // Base class 00116 00117 00118 /****************************************************************************************** 00119 00120 > class PathStroker : public CC_CLASS_MEMDUMP 00121 00122 Author: Jason_Williams (Xara Group Ltd) <camelotdev@xara.com> 00123 Created: 30/12/96 00124 00125 Purpose: Abstract Base class 00126 Converts a Trapezoid (See ProcessPathToTrapezoids, pathtrap.h) stroke 00127 definition into an output path. 00128 00129 The base class strokes a path with variable-width 00130 00131 ******************************************************************************************/ 00132 00133 class PathStroker : public CC_CLASS_MEMDUMP 00134 { 00135 CC_DECLARE_MEMDUMP(PathStroker); 00136 00137 public: // Construction/Destruction 00138 PathStroker(); 00139 PathStroker(ValueFunction *WidthFunction, INT32 LineWidth, LineCapType CapType); 00140 virtual ~PathStroker() { } 00141 00142 public: // Public interface 00143 virtual BOOL StrokePath(TrapsList *pTraps, Path *pOutput); 00144 // Go forth and stroke thine path 00145 00146 // Smoothed version of above... 00147 virtual BOOL StrokeSmoothPath(TrapsList *pTraps, Path *pOutput); 00148 00149 00150 protected: // Internal helper functions 00151 BOOL MapLineForwards(TrapEdgeList *Traps, Path *pOutput); 00152 void RecursiveMapLineForwards( TrapEdge *pEdge1, DocCoord &Point1, 00153 TrapEdge *pEdge2, DocCoord &Point2, 00154 Path *pOutput); 00155 00156 BOOL MapLineBackwards(TrapEdgeList *Traps, Path *pOutput); 00157 void RecursiveMapLineBackwards( TrapEdge *pEdge1, DocCoord &Point1, 00158 TrapEdge *pEdge2, DocCoord &Point2, 00159 Path *pOutput); 00160 00161 BOOL MapLineCap(LineCapType CapType, TrapEdge *pEdge, BOOL IsStartCap, 00162 Path *pOutput); 00163 00164 protected: 00165 ValueFunction *pWidthFunction; // ValueFunction providing width information 00166 INT32 MaxWidth; // Maximum width (in millipoints) of the stroke 00167 LineCapType CapStyle; // Line cap style (butt, round, or square) 00168 INT32 RecursionDepth; // Recursion depth counter to avoid stack overflows 00169 }; 00170 00171 00172 00173 00174 00176 // Derived classes 00178 00179 00180 /****************************************************************************************** 00181 00182 > class PathStrokerVector : public PathStroker 00183 00184 Author: Jason_Williams (Xara Group Ltd) <camelotdev@xara.com> 00185 Created: 20/2/97 00186 00187 Purpose: Path stroker 00188 Converts a Trapezoid (See ProcessPathToTrapezoids, pathtrap.h) stroke 00189 definition into an output path. 00190 00191 This "moulds" all the elements (beziers/lines) of a given path to lie 00192 within a stroke envelope defined by the provided trapezoid list 00193 00194 ******************************************************************************************/ 00195 00196 class PathStrokerVector : public PathStroker 00197 { 00198 CC_DECLARE_MEMDUMP(PathStrokerVector); 00199 00200 public: 00201 PathStrokerVector(ValueFunction *WidthFunction, INT32 LineWidth, 00202 LineCapType CapType, DocRect *pSourceBounds); 00203 00204 public: // Public interface 00205 void PrepareToStroke(TrapEdgeList *pTraps); 00206 // Prepare for stroking. Must be called before StrokePath/MapCoord 00207 00208 virtual BOOL StrokePath(TrapsList *pTraps, Path *pOutput); // DO NOT USE this version! 00209 virtual BOOL StrokePath(Path *pSourceVector, Path *pOutput); 00210 // Go forth and stroke thine path 00211 00212 DocCoord MapCoord(DocCoord *pCoord); 00213 // Maps a coordinate across from the source space to the output space 00214 // Called internally, and also from FillGeometryAttribute::MouldIntoStroke 00215 00216 double GetScaleFactor(void); 00217 // Returns a scaling factor indicating how much larger/smaller the mapped 00218 // brush is than it was in the original brush definition. This is used 00219 // to scale line widths etc to keep aspect ratios approximately correct. 00220 00221 protected: // Internal helper functions 00222 void FindEdgeForCoord(DocCoord *pCoord, UINT32 StartIndex, INT32 Direction, 00223 /* TO */ TrapEdge *pOutput); 00224 // Computes a TrapEdge structure for the exact Position of a source Coord 00225 00226 void MapMove(DocCoord *pCoord); 00227 void MapLine(DocCoord *pCoord1, DocCoord *pCoord2); 00228 void MapBezier(DocCoord *pCoords); 00229 // Map a Move/Line/BezierTo into the output path 00230 00231 void RecursiveMapLine(TrapEdge *pEdge1, DocCoord &Point1, double Width1, 00232 TrapEdge *pEdge2, DocCoord &Point2, double Width2, 00233 INT32 Direction, Path *pOutput); 00234 // Recursively maps points from a straight line onto the stroke 00235 00236 void RecursiveMapBezier(DocCoord *pCoords, DocCoord *p1, double t1, 00237 DocCoord *p2, double t2); 00238 // Recursively maps points from a bezier onto the stroke 00239 00241 public: 00242 static StrokeHandle GetCurrentBrush(void); 00243 // Returns the current brush. If there isn't one, it builds one 00244 00245 static void BodgeRipSelection(BOOL Repeating = FALSE); 00246 // ****!!!! BODGE - will be moved elsewhere later. Rips the selection 00247 // out of the document and uses it as the new stroke brush 00248 static StrokeHandle CurrentStroke; 00250 00251 00252 private: // Member globals to save passing loads of parameters 00253 Path *pPath; // Current source path from the brush 00254 DocRect *pBounds; // Bounds of the brush 00255 double BoundsWidth; // Cached width of the bounds 00256 double BoundsHalfHeight; // Cached half-height of the bounds 00257 double BoundsYCentre; // Cached centre (Y) of the bounds 00258 00259 Path *pOutput; // Path to recieve mapped output data 00260 00261 TrapEdgeList*pCurrentEdgeList; // Currently active trapezoid edge list 00262 UINT32 FirstEdge; // First trapedge containing the current path 00263 UINT32 LastEdge; // Last trapedge containing the current path 00264 }; 00265 00266 00267 #endif 00268
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