// $Id: tracergn.h 1282 2006-06-09 09:46:49Z alex $ /* @@tag:xara-cn@@ DO NOT MODIFY THIS LINE ================================XARAHEADERSTART=========================== Xara LX, a vector drawing and manipulation program. Copyright (C) 1993-2006 Xara Group Ltd. Copyright on certain contributions may be held in joint with their respective authors. See AUTHORS file for details. LICENSE TO USE AND MODIFY SOFTWARE ---------------------------------- This file is part of Xara LX. Xara LX is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License version 2 as published by the Free Software Foundation. Xara LX and its component source files are distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with Xara LX (see the file GPL in the root directory of the distribution); if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA ADDITIONAL RIGHTS ----------------- Conditional upon your continuing compliance with the GNU General Public License described above, Xara Group Ltd grants to you certain additional rights. The additional rights are to use, modify, and distribute the software together with the wxWidgets library, the wxXtra library, and the "CDraw" library and any other such library that any version of Xara LX relased by Xara Group Ltd requires in order to compile and execute, including the static linking of that library to XaraLX. In the case of the "CDraw" library, you may satisfy obligation under the GNU General Public License to provide source code by providing a binary copy of the library concerned and a copy of the license accompanying it. Nothing in this section restricts any of the rights you have under the GNU General Public License. SCOPE OF LICENSE ---------------- This license applies to this program (XaraLX) and its constituent source files only, and does not necessarily apply to other Xara products which may in part share the same code base, and are subject to their own licensing terms. This license does not apply to files in the wxXtra directory, which are built into a separate library, and are subject to the wxWindows license contained within that directory in the file "WXXTRA-LICENSE". This license does not apply to the binary libraries (if any) within the "libs" directory, which are subject to a separate license contained within that directory in the file "LIBS-LICENSE". ARRANGEMENTS FOR CONTRIBUTION OF MODIFICATIONS ---------------------------------------------- Subject to the terms of the GNU Public License (see above), you are free to do whatever you like with your modifications. However, you may (at your option) wish contribute them to Xara's source tree. You can find details of how to do this at: http://www.xaraxtreme.org/developers/ Prior to contributing your modifications, you will need to complete our contributor agreement. This can be found at: http://www.xaraxtreme.org/developers/contribute/ Please note that Xara will not accept modifications which modify any of the text between the start and end of this header (marked XARAHEADERSTART and XARAHEADEREND). MARKS ----- Xara, Xara LX, Xara X, Xara X/Xtreme, Xara Xtreme, the Xtreme and Xara designs are registered or unregistered trademarks, design-marks, and/or service marks of Xara Group Ltd. All rights in these marks are reserved. Xara Group Ltd, Gaddesden Place, Hemel Hempstead, HP2 6EX, UK. http://www.xara.com/ =================================XARAHEADEREND============================ */ // This is the header file for the bitmap effect atom class #ifndef INC_TRACERGN #define INC_TRACERGN //#include "coord.h" - in camtypes.h [AUTOMATICALLY REMOVED] //#include "doccoord.h" - in camtypes.h [AUTOMATICALLY REMOVED] class UndoableOperation; class Path; class KernelBitmap; class DocCoord; class BfxPixelOp; /******************************************************************************************** > class TraceBoundaryPoint : public Coord Author: Alex_Bligh (Xara Group Ltd) Created: 21/11/1994 Purpose: Implements the TraceRegion class. This is an exceedingly simple class used to store the coordinates of boundary points on the trace ********************************************************************************************/ class TraceBoundaryPoint : public /*Coord*/ SimpleCCObject { friend class TraceRegion; inline void translate( const TraceBoundaryPoint & that); inline TraceBoundaryPoint(double x1, double y1) { x=x1; y=y1; }; inline TraceBoundaryPoint() {}; inline TraceBoundaryPoint(const TraceBoundaryPoint & that) {x=that.x; y=that.y;}; inline TraceBoundaryPoint& operator=(const TraceBoundaryPoint & that) {x=that.x; y=that.y; return *this;}; inline void operator = (const DocCoord& Other) { x=Other.x; y=Other.y; }; inline BOOL operator==(const TraceBoundaryPoint& input) const { return ((input.x == x) && (input.y == y)); }; inline BOOL operator!=(const TraceBoundaryPoint& input) const { return ((input.x != x) || (input.y != y));}; void RotateDirection(const TraceBoundaryPoint & rotation); void Init() {x=0; y=0;} void Init(INT32 x1, INT32 y1) { x=x1; y=y1; }; inline double SquaredLength() { return (x*x + y*y); } inline double Length() { return sqrt(x*x + y*y); } inline double Dot(const TraceBoundaryPoint& Other) { return (Other.x*x + Other.y*y); } TraceBoundaryPoint SetLength( double NewLen ); // Addition/Subtraction operators inline friend TraceBoundaryPoint operator + (const TraceBoundaryPoint& Point1, const TraceBoundaryPoint& Point2); inline friend TraceBoundaryPoint operator - (const TraceBoundaryPoint& Point1, const TraceBoundaryPoint& Point2); // Unary minus inline TraceBoundaryPoint operator - (); // Scale inline TraceBoundaryPoint operator * ( double Factor ); inline TraceBoundaryPoint operator / ( double Factor ); double x; double y; private: }; /******************************************************************************************** > TraceBoundaryPoint TraceBoundaryPoint::operator - () Author: Rik_Heywood (Xara Group Ltd) & Alex Created: 02/03/94 Returns: A TraceBoundaryPoint that is the negative of this Purpose: Unary Minus for a TraceBoundaryPoint (Vector) ********************************************************************************************/ TraceBoundaryPoint TraceBoundaryPoint::operator - () { TraceBoundaryPoint Result; // negate the vector Result.x = -x; Result.y = -y; // and return it return Result; } /******************************************************************************************** > TraceBoundaryPoint TraceBoundaryPoint::operator * (double Factor) Author: Rik_Heywood (Xara Group Ltd) & Alex Created: 02/03/94 Inputs: Factor - the amount to scale the vector by Returns: TraceBoundaryPoint - this vector multiplied by the Factor Purpose: TraceBoundaryPoint Multiply function. This will multiply the vector by a constant Factor. The result is returned ********************************************************************************************/ TraceBoundaryPoint TraceBoundaryPoint::operator * (double Factor) { TraceBoundaryPoint Result; // Scale the vector by the factor Result.x = (x*Factor); Result.y = (y*Factor); // and return it return Result; } /******************************************************************************************** > TraceBoundaryPoint TraceBoundaryPoint::operator / (double Factor) Author: Rik_Heywood (Xara Group Ltd) & Alex Created: 02/03/94 Inputs: Factor - the amount to scale the vector by Returns: TraceBoundaryPoint - this vector divided by the Factor Purpose: TraceBoundaryPoint Multiply function. This will divide the vector by a constant Factor. The result is returned ********************************************************************************************/ TraceBoundaryPoint TraceBoundaryPoint::operator / (double Factor) { TraceBoundaryPoint Result; // Scale the vector by the factor Result.x = (x/Factor); Result.y = (y/Factor); // and return it return Result; } /******************************************************************************************** > TraceBoundaryPoint operator + (const TraceBoundaryPoint& Point1, const TraceBoundaryPoint& Point2) Author: Rik_Heywood (Xara Group Ltd) & Alex Created: 02/03/94 Inputs: Point1 - The first TraceBoundaryPoint Vector Point2 - The Second TraceBoundaryPoint vector Returns: TraceBoundaryPoint - the TraceBoundaryPoint vector that is a combination of Point1 and Point2 Purpose: Adds two TraceBoundaryPoint vectors together. This function is a Friend of the TraceBoundaryPoint class ********************************************************************************************/ TraceBoundaryPoint operator + (const TraceBoundaryPoint& Point1, const TraceBoundaryPoint& Point2) { TraceBoundaryPoint Result; // Add the two vector together Result.x = Point1.x + Point2.x; Result.y = Point1.y + Point2.y; // return the result return Result; } /******************************************************************************************** > TraceBoundaryPoint operator - (const TraceBoundaryPoint& Point1, const TraceBoundaryPoint& Point2) Author: Rik_Heywood (Xara Group Ltd) & Alex Created: 02/03/94 Inputs: Point1 - The first TraceBoundaryPoint Vector Point2 - The Second TraceBoundaryPoint vector Returns: TraceBoundaryPoint - the TraceBoundaryPoint vector that is the first vector minus the second vector Purpose: Subtracts the two TraceBoundaryPoint vectors. This function is a Friend of the TraceBoundaryPoint class ********************************************************************************************/ TraceBoundaryPoint operator - (const TraceBoundaryPoint& Point1, const TraceBoundaryPoint& Point2) { TraceBoundaryPoint Result; // Subtract the two vector from each other Result.x = Point1.x - Point2.x; Result.y = Point1.y - Point2.y; // return the result return Result; } inline void TraceBoundaryPoint::translate(const TraceBoundaryPoint & that) { x+=that.x; y+=that.y;} /******************************************************************************************** > class TraceRegion : public CCObject Author: Alex_Bligh (Xara Group Ltd) Created: 21/11/1994 Purpose: Implements the TraceRegion class. This class takes a given point on a bitmap and produces a boundary trace for it. The boundary criterion currently imposed is 'not white'. ********************************************************************************************/ #define TR_NUMDIRECTIONMASK (0x7) #define FIT_STEPS 10 class TraceRegion : public CCObject { CC_DECLARE_DYNCREATE(TraceRegion); //TraceRegion(); constructors and destructors are simple //~TraceRegion(); public: // Constructor & Destructor TraceRegion(); ~TraceRegion(); // External object interface BOOL UseBitmap(KernelBitmap * pBitmap); BOOL UsePath(Path * pPath); BOOL Trace(INT32 InitialX, INT32 InitialY, BfxPixelOp * thepBfxPixelOp); BOOL SetParams(double * pPixelError = NULL); BOOL GetParams(double * pPixelError = NULL); // For testing porpoises static void Test(UndoableOperation * Op); protected: // For testing porpoises BOOL TraceBoundary(DocCoord Origin,DocCoord Point1,DocCoord Point2); // Trace buffer management BOOL FillBoundaryBuffer(BOOL * End); BOOL ProcessBoundaryBuffer(BOOL Done = FALSE); BOOL FindInitialPoint(BOOL * End); // Curve smoothing void FitCubic(INT32 FirstPoint, INT32 LastPoint, TraceBoundaryPoint Tangent1, TraceBoundaryPoint Tangent2, BOOL IsStartCusp, BOOL IsEndCusp); void GenerateBezier(INT32 FirstPoint, INT32 LastPoint, TraceBoundaryPoint Tangent1, TraceBoundaryPoint Tangent2, TraceBoundaryPoint* Bezier); TraceBoundaryPoint BezierPoint( TraceBoundaryPoint* Bez, double u); BOOL CalcMaxError(INT32 LeftPoint, INT32 RightPoint, TraceBoundaryPoint* Bezier, INT32* SplitPoint, double * MaxDist, INT32 Level); void Parameterize(INT32 FirstPoint, INT32 LastPoint); TraceBoundaryPoint LeftTangent(INT32 Start, INT32 Points); TraceBoundaryPoint RightTangent(INT32 End, INT32 Points); TraceBoundaryPoint CentreTangent(INT32 Centre, INT32 Points); // Path management void InsertBezier(TraceBoundaryPoint* Bezier, BOOL IsStartCusp, BOOL IsEndCusp); void InsertLine(const DocCoord& Start, const DocCoord& End,BOOL IsStartCusp, BOOL IsEndCusp); void InsertStraightLine(const DocCoord& End); // Functions to evaluate various components of the bezier function double Bezier0(double u) { double t=1.0-u; return (t*t*t); } double Bezier1(double u) { double t=1.0-u; return (3*u*t*t); } double Bezier2(double u) { double t=1.0-u; return (3*u*u*t); } double Bezier3(double u) { return (u*u*u); } // Miscellaneous inline BOOL IsCuspDirectionChange(INT32 dir1, INT32 dir2); TraceBoundaryPoint * BoundaryBuffer; BfxPixelOp * pBfxPixelOp; KernelBitmap * Bitmap; INT32 xsize; INT32 ysize; TraceBoundaryPoint InitialPoint; TraceBoundaryPoint HeadPoint; INT32 InitialDirection; INT32 TailDirection; INT32 HeadDirection; TraceBoundaryPoint FirstBufferPoint; INT32 BoundaryTail; INT32 BoundaryHead; INT32 BoundaryRingMask; INT32 BoundaryRingSize; double Error; // Squared error double PixelError; // user i/f to error above BOOL VirginBuffer; BOOL VirginPath; BOOL AtCusp; BOOL TailCusp; Path * ThePath; TraceBoundaryPoint Directions[TR_NUMDIRECTIONMASK+1]; TraceBoundaryPoint DirectionPoint[TR_NUMDIRECTIONMASK+1][TR_NUMDIRECTIONMASK+1][4]; double TValues[FIT_STEPS+1]; INT32 TPoints[FIT_STEPS+1]; TraceBoundaryPoint Q1[3], Q2[2]; // Q' & Q'' INT32 NumTPoints; }; inline BOOL TraceRegion::IsCuspDirectionChange(INT32 dir1, INT32 dir2) { return (((dir1-dir2+TR_NUMDIRECTIONMASK+2) & TR_NUMDIRECTIONMASK)>2); } // Returns TRUE iff (dir1 - dir2) MOD numberofdirections is neither -1, 0, nor 1, i.e. 90 degree or greater // path change #endif // INC_TRACERGN