146 lines
3.3 KiB
C++
146 lines
3.3 KiB
C++
#include "image_view.h"
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#include <QGraphicsScene>
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#include <QBuffer>
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#include <QEvent>
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#include <QMouseEvent>
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#include <QWheelEvent>
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#include <QDebug>
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#include <qmath.h>
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ImageView::ImageView(QWidget * parent): QGraphicsView(parent) {
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setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
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setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
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setDragMode(QGraphicsView::NoDrag);
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setTransformationAnchor(QGraphicsView::AnchorUnderMouse);
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setScene(new QGraphicsScene());
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setRenderHint(QPainter::Antialiasing, true);
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setRenderHint(QPainter::SmoothPixmapTransform, true);
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item.setTransformationMode(Qt::SmoothTransformation);
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item.setFlags(QGraphicsItem::GraphicsItemFlags());
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scene()->addItem(&item);
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viewport()->setAutoFillBackground(false);
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viewport()->installEventFilter(this);
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autofit_ = true;
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}
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ImageView::~ImageView() {
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}
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QPixmap ImageView::pixmap() const {
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return map;
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}
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void ImageView::setPixmap(QPixmap pixmap) {
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map = pixmap;
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adjustView();
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}
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void ImageView::setImage(const QImage & i) {
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im_data.clear();
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if (i.isNull()) {
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item.setPixmap(QPixmap());
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map = QPixmap();
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return;
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}
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QBuffer b(&im_data); b.open(QIODevice::ReadWrite);
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i.save(&b, "png");
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b.close();
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map = QPixmap::fromImage(i);
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adjustView();
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}
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void ImageView::setImage(const QByteArray & i) {
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im_data = i;
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if (i.isEmpty()) {
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item.setPixmap(QPixmap());
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map = QPixmap();
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return;
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}
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map = QPixmap::fromImage(QImage::fromData(i));
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adjustView();
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}
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void ImageView::clear() {
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im_data.clear();
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item.setPixmap(QPixmap());
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map = QPixmap();
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}
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void ImageView::mouseDoubleClickEvent(QMouseEvent * e) {
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autofit();
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}
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void ImageView::mousePressEvent(QMouseEvent * e) {
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QGraphicsView::mousePressEvent(e);
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emit clicked(mapToScene(e->pos()), e->buttons());
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}
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void ImageView::mouseMoveEvent(QMouseEvent * e) {
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//if (e->buttons().testFlag(Qt::RightButton) && !autofit_ && isInteractive()) return;;
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QGraphicsView::mouseMoveEvent(e);
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}
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//void ImageView::wheelEvent(QWheelEvent * e) {
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// if (!e->modifiers().testFlag(Qt::ControlModifier) || !isInteractive()) return;
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// double scl = 1. + e->delta() / 500.;
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// //autofit_ = false;
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// //scale(scl, scl);
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//}
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bool ImageView::eventFilter(QObject * o, QEvent * e) {
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QMouseEvent * me = (QMouseEvent *)e;
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switch (e->type()) {
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case QEvent::Resize:
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adjustView();
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break;
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case QEvent::MouseButtonPress:
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prev_pos = me->pos();
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break;
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case QEvent::MouseMove:
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if (!me->buttons().testFlag(Qt::RightButton) || autofit_ || !isInteractive()) break;
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{
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//double scl = 1. / qSqrt(transform().determinant());
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//QPointF dp = QPointF(me->pos() - prev_pos) * scl;
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//qDebug() << dp;
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//translate(0.00001, 0);
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prev_pos = me->pos();
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}
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break;
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default: break;
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}
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return QGraphicsView::eventFilter(o, e);
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}
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void ImageView::adjustView() {
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qreal mp = map.width() / map.size().boundedTo(size()).width();
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if (mp > 1) {
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item.setPixmap(map.scaled(map.size()/mp, Qt::KeepAspectRatio, Qt::SmoothTransformation));
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} else {
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item.setPixmap(map);
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}
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if (!autofit_) return;
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setSceneRect(item.boundingRect());
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fitInView(&item, Qt::KeepAspectRatio);
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centerOn(&item);
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}
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void ImageView::autofit() {
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autofit_ = true;
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adjustView();
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}
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