// $Id: pathpcs.cpp 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. 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Xara Group Ltd, Gaddesden Place, Hemel Hempstead, HP2 6EX, UK. http://www.xara.com/ =================================XARAHEADEREND============================ */ // pathpcs - Definition of rendering PathProcessor class #include "camtypes.h" #include "pathpcs.h" //#include "paths.h" - in camtypes.h [AUTOMATICALLY REMOVED] CC_IMPLEMENT_DYNAMIC(PathProcessor, CCObject); // Declare smart memory handling in Debug builds #define new CAM_DEBUG_NEW /******************************************************************************************** > PathProcessor::PathProcessor() Author: Jason_Williams (Xara Group Ltd) Created: 20/12/96 Purpose: Constructor ********************************************************************************************/ PathProcessor::PathProcessor() { NextProcessor = NULL; ParentAttr = NULL; m_DisableMe = FALSE; } /******************************************************************************************** > virtual PathProcessor::~PathProcessor() Author: Jason_Williams (Xara Group Ltd) Created: 20/12/96 Purpose: Destructor Errors: If this object still has a non-NULL Next pointer, it will ERROR3 in an effort to get you to clean up properly before destruction. ********************************************************************************************/ PathProcessor::~PathProcessor() { ERROR3IF(NextProcessor != NULL, "PathProcessor deleted while still possibly held in stack"); } /******************************************************************************************** > virtual BOOL PathProcessor::WillChangeFillAndStrokeSeparately(void) Author: Jason_Williams (Xara Group Ltd) Created: 20/12/96 Purpose: Called by the RenderRegion to determine if this PathProcessor affects the "fill" and "stroke" portions of the path separately. (Generally speaking, only fill/stroke providers will cause these two different "bits" of a path to be rendered separately). This call is made BEFORE this Processor's ProcessPath function will be called. If the caller gets a TRUE back, the stroke and fill paths will be rendered separately. Notes: Base class implementation returns FALSE. Derived Stroke and Fill processors should probably override this method to return TRUE. ********************************************************************************************/ BOOL PathProcessor::WillChangeFillAndStrokeSeparately(void) { return(FALSE); } /******************************************************************************************** > virtual void PathProcessor::ProcessPath(Path *pPath, RenderRegion *pRender) = 0; Author: Jason_Williams (Xara Group Ltd) Created: 20/12/96 Purpose: ABSTRACT FUNCTION - see derived classes Called by the RenderRegion to apply the path processing operation to the given path. Notes: * When rendering a path, always pass in your 'this' pointer to RenderRegion::DrawPath, so that you don't start an infinite recursion! * To stop rendering of the path, simply return without calling the RR * To render this path unchanged, simply call directly back to the RR: pRender->DrawPath(pPath, this); * Only affect the fill of this path if pPath->IsFilled * Only affect the stroke of this path if pPath->IsStroked * If converting a path into a "filled path" for stroking, the output path should be rendered with IsStroked=FALSE or it'll get a line around the outside! * If you render any attributes, etc, then you should preserve the render region state with calls to SaveContext() and RestoreContext() ********************************************************************************************/ /******************************************************************************************** > virtual BOOL PathProcessor::DoesActuallyDoAnything(RenderRegion* pRender) Author: Diccon_Yamanaka (Xara Group Ltd) Created: 1/10/2000 Inputs: pRender - pointer to the render region that we are about to render our path into Returns: TRUE if it is anticipated that this path processor will alter the path in any way, FALSE if not Purpose: To determine whether or not our path processor is 'default' i.e. if does not change the path at all. If so then the render region will be free to use DrawPathToOutputDevice which will let us use dash patterns, arrowheads etc. Errors: ********************************************************************************************/ BOOL PathProcessor::DoesActuallyDoAnything(RenderRegion* pRender) { return !m_DisableMe; } /******************************************************************************************** > void PathProcessor::SetDisabled(BOOL Value) Author: Diccon_Yamanaka (Xara Group Ltd) Created: 1/10/00 Inputs: Whether or not to disable this PPB Purpose: Sets the flag which we use to determine whether or not we should do anything when it comes to rendering. ********************************************************************************************/ void PathProcessor::SetDisabled(BOOL Value) { m_DisableMe = Value; } /******************************************************************************************** > BOOL PathProcessor::IsDisabled() Author: Diccon_Yamanaka (Xara Group Ltd) Created: 1/10/00 Inputs: - Returns: Whether or not we are disabled Purpose: ********************************************************************************************/ BOOL PathProcessor::IsDisabled() { return m_DisableMe; }