vdistributecmd.cpp

/* This file is doc of the KDE project
   Copyright (C) 2005 The Karbon Developers
 
   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 <tdelocale.h>
 
#include "vdistributecmd.h"
#include "vtransformcmd.h"
#include "vdocument.h"
#include "vselection.h"
 
VDistributeCmd::VDistributeCmd( VDocument *doc, Distribute distribute )
    : VCommand( doc, i18n( "Distribute Objects" ) ), m_distribute( distribute )
{
    m_trafoCmds.setAutoDelete( true );
}
 
VDistributeCmd::~VDistributeCmd()
{
}
 
void
VDistributeCmd::execute()
{
    if( document()->selection()->objects().count() <= 2 )
        return;
    
    KoRect bbox;
    double extent = 0.0;
    double dx, dy;
 
    VObjectList objs = document()->selection()->objects();
    VObjectListIterator itr( objs );
 
    TQMap<double,VObject*> sortedPos;
 
    // sort by position and calculate sum of objects widht/height
    for( ; itr.current(); ++itr )
    {
        bbox = itr.current()->boundingBox();
        switch( m_distribute )
        {
            case DISTRIBUTE_HORIZONTAL_CENTER:
                sortedPos[bbox.center().x()] = itr.current();
            break;
            case DISTRIBUTE_HORIZONTAL_GAP:
            case DISTRIBUTE_HORIZONTAL_LEFT:
                sortedPos[bbox.left()] = itr.current();
                extent += bbox.width();
            break;
            case DISTRIBUTE_HORIZONTAL_RIGHT:
                sortedPos[bbox.right()] = itr.current();
            break;
            case DISTRIBUTE_VERTICAL_CENTER:
                sortedPos[bbox.center().y()] = itr.current();
            break;
            case DISTRIBUTE_VERTICAL_GAP:
            case DISTRIBUTE_VERTICAL_BOTTOM:
                sortedPos[bbox.bottom()] = itr.current();
                extent += bbox.height();
            break;
            case DISTRIBUTE_VERTICAL_TOP:
                sortedPos[bbox.top()] = itr.current();
            break;
        }
    }
    
    VObject* first = sortedPos.begin().data();
    VObject* last = (--sortedPos.end()).data();
 
    // determine the available space to distribute
    double space = getAvailableSpace( first, last, extent );
    double pos = 0.0, step = space / double(objs.count() - 1);
 
    VTranslateCmd *trafoCmd = 0L;
    TQMapIterator<double,VObject*> it = sortedPos.begin(), et = sortedPos.end();
 
    for( ; it != et; ++it ) 
    {
        if( it.data() == first || it.data() == last )
            continue;
 
        pos += step;
 
        document()->selection()->clear();
        
        bbox = it.data()->boundingBox();
 
        switch( m_distribute )
        {
            case DISTRIBUTE_HORIZONTAL_CENTER:
                dx = first->boundingBox().center().x() + pos - bbox.center().x();
                dy = 0.0;
            break;
            case DISTRIBUTE_HORIZONTAL_GAP:
                dx = first->boundingBox().right() + pos + 0.5 * bbox.width() - bbox.center().x();
                dy = 0.0;
                pos += bbox.width();
            break;
            case DISTRIBUTE_HORIZONTAL_LEFT:
                dx = first->boundingBox().left() + pos - bbox.left();
                dy = 0.0;
            break;
            case DISTRIBUTE_HORIZONTAL_RIGHT:
                dx = first->boundingBox().right() + pos - bbox.right();
                dy = 0.0;
            break;
            case DISTRIBUTE_VERTICAL_CENTER:
                dx = 0.0;
                dy = first->boundingBox().center().y() + pos - bbox.center().y();
            break;
            case DISTRIBUTE_VERTICAL_GAP:
                dx = 0.0;
                dy = first->boundingBox().bottom() + pos + 0.5 * bbox.height() - bbox.center().y();
                pos += bbox.height();
            break;
            case DISTRIBUTE_VERTICAL_BOTTOM:
                dx = 0.0;
                dy = first->boundingBox().bottom() + pos - bbox.bottom();
            break;
            case DISTRIBUTE_VERTICAL_TOP:
                dx = 0.0;
                dy = first->boundingBox().top() + pos - bbox.top();
            break;
        };
        document()->selection()->append( it.data() );
        trafoCmd = new VTranslateCmd( document(), dx, dy );
        m_trafoCmds.append( trafoCmd );
        trafoCmd->execute();
    }
    
    // re-add object to selection
    itr.toFirst();
    for( ; itr.current() ; ++itr )
        document()->selection()->append( itr.current() );
    setSuccess( true );
}
 
void
VDistributeCmd::unexecute()
{
    TQPtrListIterator<VTranslateCmd> itr( m_trafoCmds );
    for( ; itr.current() ; ++itr )
        itr.current()->unexecute();
    setSuccess( false );
}
 
double
VDistributeCmd::getAvailableSpace( VObject *first, VObject *last, double extent )
{
    switch( m_distribute )
    {
        case DISTRIBUTE_HORIZONTAL_CENTER:
            return last->boundingBox().center().x() - first->boundingBox().center().x();
        break;
        case DISTRIBUTE_HORIZONTAL_GAP:
            extent -= first->boundingBox().width() + last->boundingBox().width();
            return last->boundingBox().left() - first->boundingBox().right() - extent;
        break;
        case DISTRIBUTE_HORIZONTAL_LEFT:
            return last->boundingBox().left() - first->boundingBox().left();
        break;
        case DISTRIBUTE_HORIZONTAL_RIGHT:
            return last->boundingBox().right() - first->boundingBox().right();
        break;
        case DISTRIBUTE_VERTICAL_CENTER:
            return last->boundingBox().center().y() - first->boundingBox().center().y();
        break;
        case DISTRIBUTE_VERTICAL_GAP:
            extent -= first->boundingBox().height() + last->boundingBox().height();
            return last->boundingBox().top() - first->boundingBox().bottom() - extent;
        break;
        case DISTRIBUTE_VERTICAL_BOTTOM:
            return last->boundingBox().bottom() - first->boundingBox().bottom();
        break;
        case DISTRIBUTE_VERTICAL_TOP:
            return last->boundingBox().top() - first->boundingBox().top();
        break;
    }
 
    return 0.0;
}