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// SPDX-License-Identifier: GPL-2.0+
/*******************************************************************************
* QtMips - MIPS 32-bit Architecture Subset Simulator
*
* Implemented to support following courses:
*
* B35APO - Computer Architectures
* https://cw.fel.cvut.cz/wiki/courses/b35apo
*
* B4M35PAP - Advanced Computer Architectures
* https://cw.fel.cvut.cz/wiki/courses/b4m35pap/start
*
* Copyright (c) 2017-2019 Karel Koci<cynerd@email.cz>
* Copyright (c) 2019 Pavel Pisa <pisa@cmp.felk.cvut.cz>
*
* Faculty of Electrical Engineering (http://www.fel.cvut.cz)
* Czech Technical University (http://www.cvut.cz/)
*
* 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 2
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
******************************************************************************/
#include "graphicsview.h"
GraphicsView::GraphicsView(QWidget *parent) : Super(parent) {
prev_height = 0;
prev_width = 0;
setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform);
}
void GraphicsView::setScene(QGraphicsScene *scene) {
Super::setScene(scene);
update_scale();
}
void GraphicsView::resizeEvent(QResizeEvent *event) {
Super::resizeEvent(event);
if ((width() != prev_height) || (height() != prev_width))
update_scale();
}
void GraphicsView::update_scale() {
if (scene() == nullptr)
return; // Skip if we have no scene
// Note: there is somehow three pixels error when viewing so we have to always compensate
const int w = scene()->width() + 3;
const int h = scene()->height() + 3;
prev_height = width();
prev_width = height();
qreal scale = 1;
if (height() > h && width() > w) {
if (height() > width()) {
scale = (qreal)width() / w;
} else {
scale = (qreal)height() / h;
}
}
QTransform t;
t.scale(scale, scale);
setTransform(t, false);
}
void GraphicsView::wheelEvent(QWheelEvent *event) {
if (event->modifiers() & Qt::ControlModifier) {
// zoom
const ViewportAnchor anchor = transformationAnchor();
setTransformationAnchor(QGraphicsView::AnchorUnderMouse);
int angle = event->angleDelta().y();
qreal factor;
if (angle > 0) {
factor = 1.1;
} else {
factor = 0.9;
}
scale(factor, factor);
setTransformationAnchor(anchor);
} else {
Super::wheelEvent(event);
}
}
void GraphicsView::keyPressEvent(QKeyEvent *event) {
qreal factor = 1.1;
if (event->matches(QKeySequence::ZoomIn) ||
(event->key() == Qt::Key_Equal) ||
(event->key() == Qt::Key_Plus)) {
scale(factor, factor);
} else if (event->matches(QKeySequence::ZoomOut) ||
(event->key() == Qt::Key_Minus)) {
scale(1 / factor, 1 / factor);
} else {
Super::keyPressEvent(event);
}
}
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