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/* 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>
#include <limits>
KoPathSegmentChangeStrategy::KoPathSegmentChangeStrategy( KoPathTool *tool, const QPointF &pos, const KoPathPointData &segment, qreal segmentParam)
: KoInteractionStrategy(tool)
, m_originalPosition(pos)
, m_lastPosition(pos)
, m_tool(tool)
, m_segmentParam(segmentParam)
, m_pointData1(segment)
, m_pointData2(segment)
{
const qreal eps = std::numeric_limits<qreal>::epsilon();
// force segment parameter range to avoid division by zero
m_segmentParam = qBound(eps, m_segmentParam, qreal(1.0-eps));
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 );
if (ipol.isValid()) {
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;
}
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