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/********************************************************************************************
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**    iLand - an individual based forest landscape and disturbance model
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**    http://iland.boku.ac.at
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**    Copyright (C) 2009-  Werner Rammer, Rupert Seidl
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**
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**    This program is free software: you can redistribute it and/or modify
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**    it under the terms of the GNU General Public License as published by
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**    the Free Software Foundation, either version 3 of the License, or
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**    (at your option) any later version.
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**
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**    This program is distributed in the hope that it will be useful,
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**    but WITHOUT ANY WARRANTY; without even the implied warranty of
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**    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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**    GNU General Public License for more details.
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**
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**    You should have received a copy of the GNU General Public License
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**    along with this program.  If not, see <http://www.gnu.org/licenses/>.
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********************************************************************************************/
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#include <QtGui>
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#include "paintarea.h"
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// static
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QColor PaintObject::background_color = Qt::white;
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/** @class PaintArea
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  @ingroup GUI
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  A small compoenent that acts as the "window" for special drawing.
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  The PaintArea is embedded in the MainWindow. The PaintArea receives UI events from Qt and,
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  after some processing emits signals.
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  */
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PaintArea::PaintArea(QWidget *parent)
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     : QWidget(parent)
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 {
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     m_bitmap = QImage(this->size(), QImage::Format_ARGB32_Premultiplied);
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     // enable mouse tracking
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     this->setMouseTracking(true);
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     // enable keyboard focus
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     setFocusPolicy(Qt::StrongFocus);
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 }
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void PaintArea::resizeEvent(QResizeEvent *event)
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{
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    Q_UNUSED(event);
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    m_bitmap = QImage(this->size(), QImage::Format_ARGB32_Premultiplied);
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    //qDebug() << "paintarea resize" << this->size();
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}
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void PaintArea::paintEvent(QPaintEvent *)
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{
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    QPainter painter(this);
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    QPainter pxpainter(&m_bitmap);
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     emit needsPainting(pxpainter);
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     painter.drawImage(rect(), m_bitmap);
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}
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void PaintArea::mousePressEvent ( QMouseEvent * event )
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{
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    m_lastDown = event->pos();
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    //emit mouseClick(event->pos());
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}
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void PaintArea::mouseMoveEvent( QMouseEvent * event )
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{
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    if (event->buttons() == Qt::LeftButton)
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        setCursor(Qt::ClosedHandCursor);
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    emit mouseMove(event->pos());
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}
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void PaintArea::wheelEvent ( QWheelEvent * event )
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{
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    emit mouseWheel(event->pos(), event->delta() / 120);
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}
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void PaintArea::mouseReleaseEvent ( QMouseEvent * event )
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{
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    setCursor(Qt::CrossCursor);
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    if ( (event->pos()-m_lastDown).manhattanLength() > 2) {
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        emit mouseDrag(m_lastDown, event->pos(), event->button());
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    } else {
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        // a click event...
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        emit mouseClick(event->pos());
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    }
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}
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void PaintArea::keyPressEvent(QKeyEvent *event)
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{
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    // emulate mouse actions with the keyboard
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    QPoint mousepos = this->rect().center();
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    switch (event->key()) {
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        case Qt::Key_Plus:
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        case Qt::Key_PageUp:  // zoom in
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            emit mouseWheel(mousepos, 1);
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            break;
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        case Qt::Key_PageDown: // zoom out
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        case Qt::Key_Minus:
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            emit mouseWheel(mousepos, -1);
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            break;
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        // pan with cursor keys
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        case Qt::Key_Left:
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            emit mouseDrag(mousepos, mousepos + QPoint(20, 0), Qt::MidButton); break;
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        case Qt::Key_Right:
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            emit mouseDrag(mousepos, mousepos + QPoint(-20, 0), Qt::MidButton); break;
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        case Qt::Key_Up:
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            emit mouseDrag(mousepos, mousepos + QPoint(0, 20), Qt::MidButton); break;
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        case Qt::Key_Down:
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            emit mouseDrag(mousepos, mousepos + QPoint(0, -20), Qt::MidButton); break;
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        }
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}