BoardView.cpp

/*
 *    This file is part of layoutie.
 *
 *    layoutie is free software: you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation, either version 3 of the License, or
 *    (at your option) any later version.
 *
 *    layoutie 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 General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with layoutie.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#include "BoardView.h"

#include "BoardScene.h"

#include <QWheelEvent>
#include <QGLWidget>

#include <SLBoard.h>

#include <cmath>

BoardView::BoardView(QWidget* inParent, SLFormat::Board* inBoard)
    : QGraphicsView(inParent), mBoard(inBoard)
{
    if (QGLFormat::hasOpenGL())
    {
        setViewport(new QGLWidget(QGLFormat(QGL::SampleBuffers | QGL::Rgba | QGL::AlphaChannel)));
        setViewportUpdateMode(QGraphicsView::FullViewportUpdate);
        setRenderHint(QPainter::HighQualityAntialiasing);

        this->setFrameStyle(QFrame::NoFrame); // semitransparent frame causes artifacts when using OpenGL
    }

    mScene = new BoardScene(inBoard, this);
    this->setScene(mScene);

    setTransformationAnchor(AnchorUnderMouse);
    setRenderHint(QPainter::Antialiasing);
    updateZoom();
}

BoardView::~BoardView()
{

}

void BoardView::wheelEvent(QWheelEvent* inEvent)
{
    int turns = inEvent->delta() / 8 / 15;
    double change = std::pow(1.4, turns);
    double newZoomLevel = mBoard->zoomLevel() * change;
    double min = 200.0 / qMax(mScene->height(), mScene->width());
    if (newZoomLevel < min)
        newZoomLevel = min;
    if (newZoomLevel > 1)
        newZoomLevel = 1;
    mBoard->setZoomLevel(newZoomLevel);
    updateZoom();
}

void BoardView::updateZoom()
{
    double zoom = mBoard->zoomLevel();
    QTransform m;
    m.scale(zoom, zoom);
    this->setTransform(m, false);
    mScene->zoomed();
}