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//
// C++ Implementation: situationview
//
// Description:
//
//
// Author: Thibaut GRIDEL <tgridel@free.fr>
//
// Copyright (c) 2008-2015 Thibaut GRIDEL
//
// This program 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.
//
// This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
//
//
#include <iostream>
#include <cmath>
#include "commontypes.h"
#include "situationview.h"
#include <QtGui/QWheelEvent>
extern int debugLevel;
SituationView::SituationView(QWidget *parent)
:QGraphicsView(parent) {
}
SituationView::SituationView(QGraphicsScene *scene, QWidget *parent)
: QGraphicsView(scene, parent),
scaleValue(1),
lookDirectionValue(0),
tiltValue(0) {
setRenderHints( QPainter::Antialiasing | QPainter::SmoothPixmapTransform);
setViewportUpdateMode(QGraphicsView::SmartViewportUpdate);
setResizeAnchor(QGraphicsView::AnchorViewCenter);
setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
connect( scene, SIGNAL(centerChanged(QPointF)),
this, SLOT(setCenter(QPointF)));
connect( scene, SIGNAL(lookDirectionChanged(qreal)),
this, SLOT(setLookDirection(qreal)));
connect( scene, SIGNAL(tiltChanged(qreal)),
this, SLOT(setTilt(qreal)));
}
SituationView::~SituationView() {
}
/**
Takes a picture of the current view and returns it as a QPixmap.
This method creates a QPixmap and calls render() on that pixmap
before returning it.
*/
QPixmap SituationView::screenShot() {
QPixmap pixmap(size());
pixmap.fill(Qt::white);
QPainter painter(&pixmap);
painter.setRenderHints( QPainter::Antialiasing | QPainter::SmoothPixmapTransform);
render(&painter);
return pixmap;
}
/**
Handles mouse wheel event to zoom in or out.
This method will call setScale() with rotation side.
*/
void SituationView::wheelEvent(QWheelEvent *event) {
if (debugLevel & 1 << VIEW) std::cout << "wheel event " << event->angleDelta().x() << ", " << event->angleDelta().y() << std::endl;
setScale(event->angleDelta().y() > 0);
}
void SituationView::mousePressEvent(QMouseEvent *event) {
setDragMode(QGraphicsView::ScrollHandDrag);
QGraphicsView::mousePressEvent(event);
}
void SituationView::mouseReleaseEvent(QMouseEvent *event) {
QGraphicsView::mouseReleaseEvent(event);
setDragMode(QGraphicsView::NoDrag);
}
void SituationView::zoomIn() {
setScale(true);
}
void SituationView::zoomOut() {
setScale(false);
}
/**
Sets an acceptable scale that fits the whole scenario.
This method compares the matrix() before and after fitInView() and
possibly adopts the scale, rounded to the nearest .05
*/
void SituationView::zoomFit() {
fitInView(scene()->itemsBoundingRect(),Qt::KeepAspectRatio); // Qt doesn't seem to get this quite right when the view is tilted, but close enough
qreal s = sqrt (transform().determinant());
if (s < 10.0 && s > 0.1) {
// adapt scaling
scaleValue = pow(1.1, round(log(s)/log(1.1)));
}
transformView();
}
void SituationView::setLookDirection(qreal value) {
lookDirectionValue = value;
emit lookDirectionChanged(qRound(lookDirectionValue));
transformView();
}
void SituationView::setTilt(qreal value) {
tiltValue = value;
emit tiltChanged(qRound(tiltValue));
transformView();
}
void SituationView::setCenter(QPointF position) {
centerOn(position);
}
/**
Zoom in if \a in otherwise zoom out by .05 increments between
0.1 and 10
*/
void SituationView::setScale(bool in) {
if (in) {
if (scaleValue < 10.0) {
scaleValue *= 1.1;
}
} else if (scaleValue > 0.1) {
scaleValue /= 1.1;
}
if (debugLevel & 1 << VIEW)
std::cout << "new scale values " << scaleValue << std::endl;
transformView();
}
void SituationView::transformView() {
QTransform transform;
transform.rotate(tiltValue, Qt::XAxis);
transform.rotate(-lookDirectionValue, Qt::ZAxis);
transform.scale(scaleValue, scaleValue);
setTransform(transform, false);
}
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