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/* This file is part of the KDE project
* Copyright (C) 2006-2007 Thomas Zander <zander@kde.org>
* Copyright (C) 2006 C. Boemann <cbo@boemann.dk>
* Copyright (C) 2008 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 "ShapeShearStrategy.h"
#include "SelectionDecorator.h"
#include "SelectionTransformCommand.h"
#include <KoToolBase.h>
#include <KoCanvasBase.h>
#include <KoPointerEvent.h>
#include <KoShapeManager.h>
#include <commands/KoShapeShearCommand.h>
#include <commands/KoShapeMoveCommand.h>
#include <commands/KoShapeTransformCommand.h>
#include <KoSelection.h>
#include <QPointF>
#include <math.h>
#include <QDebug>
#include <klocalizedstring.h>
ShapeShearStrategy::ShapeShearStrategy( KoToolBase *tool, const QPointF &clicked, KoFlake::SelectionHandle direction )
: KoInteractionStrategy(tool)
, m_start(clicked)
{
// FIXME: This test is also done in DefaultTool, so it should also be responsible for setting the shapes to operate on
KoSelection *sel = tool->canvas()->shapeManager()->selection();
QList<KoShape*> selectedShapes = sel->selectedShapes(KoFlake::StrippedSelection);
foreach(KoShape *shape, selectedShapes) {
if (shape->allowedInteraction(KoShape::ShearingAllowed, false)) {
m_selectedShapes << shape;
m_oldTransforms << shape->transformation();
}
}
m_initialSelectionMatrix = sel->transformation();
// Eventhoug we aren't currently activated by the corner handles we might as well code like it
switch(direction) {
case KoFlake::TopMiddleHandle:
m_top = true; m_bottom = false; m_left = false; m_right = false; break;
case KoFlake::TopRightHandle:
m_top = true; m_bottom = false; m_left = false; m_right = true; break;
case KoFlake::RightMiddleHandle:
m_top = false; m_bottom = false; m_left = false; m_right = true; break;
case KoFlake::BottomRightHandle:
m_top = false; m_bottom = true; m_left = false; m_right = true; break;
case KoFlake::BottomMiddleHandle:
m_top = false; m_bottom = true; m_left = false; m_right = false; break;
case KoFlake::BottomLeftHandle:
m_top = false; m_bottom = true; m_left = true; m_right = false; break;
case KoFlake::LeftMiddleHandle:
m_top = false; m_bottom = false; m_left = true; m_right = false; break;
case KoFlake::TopLeftHandle:
m_top = true; m_bottom = false; m_left = true; m_right = false; break;
default:
;// throw exception ? TODO
}
m_initialSize = sel->size();
m_solidPoint = QPointF( m_initialSize.width() / 2, m_initialSize.height() / 2);
if(m_top)
m_solidPoint += QPointF(0, m_initialSize.height() / 2);
else if(m_bottom)
m_solidPoint -= QPointF(0, m_initialSize.height() / 2);
if(m_left)
m_solidPoint += QPointF(m_initialSize.width() / 2, 0);
else if(m_right)
m_solidPoint -= QPointF(m_initialSize.width() / 2, 0);
QPointF edge;
qreal angle = 0.0;
if( m_top )
{
edge = sel->absolutePosition( KoFlake::BottomLeftCorner ) - sel->absolutePosition( KoFlake::BottomRightCorner );
angle = 180.0;
}
else if( m_bottom )
{
edge = sel->absolutePosition( KoFlake::TopRightCorner ) - sel->absolutePosition( KoFlake::TopLeftCorner );
angle = 0.0;
}
else if( m_left )
{
edge = sel->absolutePosition( KoFlake::BottomLeftCorner ) - sel->absolutePosition( KoFlake::TopLeftCorner );
angle = 90.0;
}
else if( m_right )
{
edge = sel->absolutePosition( KoFlake::TopRightCorner ) - sel->absolutePosition( KoFlake::BottomRightCorner );
angle = 270.0;
}
qreal currentAngle = atan2( edge.y(), edge.x() ) / M_PI * 180;
m_initialSelectionAngle = currentAngle - angle;
qDebug() <<" PREsol.x=" << m_solidPoint.x() <<" sol.y=" << m_solidPoint.y();
m_solidPoint = tool->canvas()->shapeManager()->selection()->absoluteTransformation(0).map( m_solidPoint );
// use crossproduct of top edge and left edge of selection bounding rect
// to determine if the selection is mirrored
QPointF top = sel->absolutePosition( KoFlake::TopRightCorner ) - sel->absolutePosition( KoFlake::TopLeftCorner );
QPointF left = sel->absolutePosition( KoFlake::BottomLeftCorner ) - sel->absolutePosition( KoFlake::TopLeftCorner );
m_isMirrored = (top.x()*left.y() - top.y()*left.x() ) < 0.0;
}
void ShapeShearStrategy::handleMouseMove(const QPointF &point, Qt::KeyboardModifiers modifiers)
{
Q_UNUSED(modifiers);
QPointF shearVector = point - m_start;
QTransform m;
m.rotate(-m_initialSelectionAngle);
shearVector = m.map(shearVector);
qreal shearX=0, shearY=0;
if(m_top || m_left)
shearVector = - shearVector;
if(m_top || m_bottom)
shearX = shearVector.x() / m_initialSize.height();
if(m_left || m_right)
shearY = shearVector.y() / m_initialSize.width();
// if selection is mirrored invert the shear values
if( m_isMirrored )
{
shearX *= -1.0;
shearY *= -1.0;
}
QTransform matrix;
matrix.translate(m_solidPoint.x(), m_solidPoint.y());
matrix.rotate(m_initialSelectionAngle);
matrix.shear(shearX, shearY);
matrix.rotate(-m_initialSelectionAngle);
matrix.translate(-m_solidPoint.x(), -m_solidPoint.y());
QTransform applyMatrix = matrix * m_shearMatrix.inverted();
foreach( KoShape *shape, m_selectedShapes )
{
shape->update();
shape->applyAbsoluteTransformation( applyMatrix );
shape->update();
}
tool()->canvas()->shapeManager()->selection()->applyAbsoluteTransformation( applyMatrix );
m_shearMatrix = matrix;
}
void ShapeShearStrategy::paint( QPainter &painter, const KoViewConverter &converter) {
SelectionDecorator decorator(KoFlake::NoHandle, true, false);
decorator.setSelection(tool()->canvas()->shapeManager()->selection());
decorator.setHandleRadius(handleRadius());
decorator.paint(painter, converter);
}
KUndo2Command* ShapeShearStrategy::createCommand() {
QVector<QTransform> newTransforms;
newTransforms.reserve(m_selectedShapes.count());
foreach( KoShape* shape, m_selectedShapes )
newTransforms << shape->transformation();
KoShapeTransformCommand * cmd = new KoShapeTransformCommand( m_selectedShapes, m_oldTransforms, newTransforms );
cmd->setText( kundo2_i18n("Shear") );
KoSelection * sel = tool()->canvas()->shapeManager()->selection();
new SelectionTransformCommand(sel, m_initialSelectionMatrix, sel->transformation(), cmd);
return cmd;
}
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