49 lines
1.2 KiB
C++
49 lines
1.2 KiB
C++
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#include <QApplication>
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#include <QGraphicsView>
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#include <QGraphicsScene>
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#include <QGraphicsPixmapItem>
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#include <QPixmap>
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#include <QWheelEvent>
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#include <QMouseEvent>
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#include <QtMath>
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#include "imageredactor.h"
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ImageRedactor::ImageRedactor(QWidget *parent) : QGraphicsView(parent) {
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scene = new QGraphicsScene(this);
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setScene(scene);
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// Load the image
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QPixmap pixmap("image.jpg");
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item = new QGraphicsPixmapItem(pixmap);
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scene->addItem(item);
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// Set the initial zoom level
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setTransformationAnchor(QGraphicsView::AnchorUnderMouse);
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}
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void ImageRedactor::wheelEvent(QWheelEvent *event) {
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// Zoom in/out
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setTransformationAnchor(QGraphicsView::AnchorUnderMouse);
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double angle = event->angleDelta().y();
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double factor = qPow(1.2, angle / 240.0);
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scale(factor, factor);
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}
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void ImageRedactor::mousePressEvent(QMouseEvent *event)
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{
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// Pan the image
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if (event->button() == Qt::LeftButton)
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{
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setDragMode(QGraphicsView::ScrollHandDrag);
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}
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}
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void ImageRedactor::mouseReleaseEvent(QMouseEvent *event)
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{
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// Reset the drag mode
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if (event->button() == Qt::LeftButton)
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{
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setDragMode(QGraphicsView::NoDrag);
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}
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}
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