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libs/flake KoPathSegmentChangeStrategy.cpp Go to the documentation of this file. /* This file is part of the KDE project * Copyright (C) 2009 Jan Hambrecht <jaham@gmx.net> * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is 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 * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public License * along with this library; see the file COPYING.LIB. If not, write to * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, * Boston, MA 02110-1301, USA. */ #include "KoPathSegmentChangeStrategy.h" #include "KoPathShape.h" #include "KoPathPoint.h" #include "KoPathTool.h" #include "KoSnapGuide.h" #include "commands/KoPathControlPointMoveCommand.h" #include "commands/KoPathSegmentTypeCommand.h" #include <KoCanvasBase.h> #include <KLocale> KoPathSegmentChangeStrategy::KoPathSegmentChangeStrategy( KoPathTool *tool, KoCanvasBase *canvas, const QPointF &pos, const KoPathPointData &segment, qreal segmentParam) : KoInteractionStrategy(tool, canvas) , m_originalPosition(pos) , m_lastPosition(pos) , m_tool(tool) , m_segmentParam(segmentParam) , m_pointData1(segment) , m_pointData2(segment) { m_path = segment.pathShape; m_segment = m_path->segmentByIndex(segment.pointIndex); m_pointData2.pointIndex = m_path->pathPointIndex(m_segment.second()); m_originalSegmentDegree = m_segment.degree(); } KoPathSegmentChangeStrategy::~KoPathSegmentChangeStrategy() { } void KoPathSegmentChangeStrategy::handleMouseMove( const QPointF &mouseLocation, Qt::KeyboardModifiers modifiers) { m_tool->canvas()->updateCanvas(m_tool->canvas()->snapGuide()->boundingRect()); QPointF snappedPosition = m_tool->canvas()->snapGuide()->snap(mouseLocation, modifiers); m_tool->canvas()->updateCanvas(m_tool->canvas()->snapGuide()->boundingRect()); QPointF localPos = m_path->documentToShape(snappedPosition); if (m_segment.degree() == 1) { // line segment is converted to a curve KoPathSegmentTypeCommand cmd(m_pointData1, KoPathSegmentTypeCommand::Curve); cmd.redo(); } QPointF move1, move2; if (m_segment.degree() == 2) { // interpolate quadratic segment between segment start, mouse position and segment end KoPathSegment ipol = KoPathSegment::interpolate( m_segment.first()->point(), localPos, m_segment.second()->point(), m_segmentParam ); move1 = move2 = ipol.controlPoints()[1] - m_segment.controlPoints()[1]; } else if (m_segment.degree() == 3) { /* * method from inkscape, original method and idea borrowed from Simon Budig * <simon@gimp.org> and the GIMP * cf. app/vectors/gimpbezierstroke.c, gimp_bezier_stroke_point_move_relative() * * feel good is an arbitrary parameter that distributes the delta between handles * if t of the drag point is less than 1/6 distance form the endpoint only * the corresponding handle is adjusted. This matches the behavior in GIMP */ const qreal t = m_segmentParam; qreal feel_good; if (t <= 1.0 / 6.0) feel_good = 0; else if (t <= 0.5) feel_good = (pow((6 * t - 1) / 2.0, 3)) / 2; else if (t <= 5.0 / 6.0) feel_good = (1 - pow((6 * (1-t) - 1) / 2.0, 3)) / 2 + 0.5; else feel_good = 1; QPointF lastLocalPos = m_path->documentToShape(m_lastPosition); QPointF delta = localPos - lastLocalPos; move2 = ((1-feel_good)/(3*t*(1-t)*(1-t))) * delta; move1 = (feel_good/(3*t*t*(1-t))) * delta; } m_path->update(); if( m_segment.first()->activeControlPoint2() ) { KoPathControlPointMoveCommand cmd(m_pointData1, move2, KoPathPoint::ControlPoint2); cmd.redo(); } if( m_segment.second()->activeControlPoint1() ) { KoPathControlPointMoveCommand cmd(m_pointData2, move1, KoPathPoint::ControlPoint1); cmd.redo(); } m_path->normalize(); m_path->update(); m_ctrlPoint1Move += move1; m_ctrlPoint2Move += move2; // save last mouse position m_lastPosition = mouseLocation; } void KoPathSegmentChangeStrategy::finishInteraction(Qt::KeyboardModifiers modifiers) { Q_UNUSED(modifiers); } QUndoCommand* KoPathSegmentChangeStrategy::createCommand() { m_tool->canvas()->updateCanvas(m_tool->canvas()->snapGuide()->boundingRect()); bool hasControlPoint1 = m_segment.second()->activeControlPoint1(); bool hasControlPoint2 = m_segment.first()->activeControlPoint2(); QUndoCommand * cmd = new QUndoCommand(i18n("Change Segment")); if (m_originalSegmentDegree == 1) { m_segment.first()->removeControlPoint2(); m_segment.second()->removeControlPoint1(); new KoPathSegmentTypeCommand(m_pointData1, KoPathSegmentTypeCommand::Curve, cmd); } if (hasControlPoint2) { QPointF oldCtrlPointPos = m_segment.first()->controlPoint2()-m_ctrlPoint2Move; m_segment.first()->setControlPoint2(oldCtrlPointPos); new KoPathControlPointMoveCommand(m_pointData1, m_ctrlPoint2Move, KoPathPoint::ControlPoint2, cmd); } if (hasControlPoint1) { QPointF oldCtrlPointPos = m_segment.second()->controlPoint1()-m_ctrlPoint1Move; m_segment.second()->setControlPoint1(oldCtrlPointPos); new KoPathControlPointMoveCommand(m_pointData2, m_ctrlPoint1Move, KoPathPoint::ControlPoint1, cmd); } return cmd; } libs/flake Skip menu "libs/flake" Main Page Namespace List Class Hierarchy Alphabetical List Class List File List Namespace Members Class Members API Reference Skip menu "API Reference" kdgantt Kexi   KoProperty   flake kplato krita   image   plugins       libbrush       libpaintop   ui kspread   part     scripting libs   flake   kotext   main   pigment   store   musicshape Generated for API Reference by doxygen 1.5.9-20090814 This website is maintained by Adriaan de Groot and Allen Winter. 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