109 lines
2.5 KiB
C++
Executable File
109 lines
2.5 KiB
C++
Executable File
/*
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* @RDE_HEADER@
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* graphicsview widget to resize qpixmaps/qimages with mouse drag and mwheel
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* $Id$
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* $HeadURL$
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* $Author$
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* Created by Jens Heilmann, SLTE, 2020-10-14
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*/
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#pragma once
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#include "lts_widgets_export.h"
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#include <QGraphicsView>
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namespace LtsWidgets
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{
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/**
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* @brief The ImageCropper class provides a graphicsview widget to crop images with mouse drag and mwheel scroll.
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* avatar() returns a pixmap of the current view (the cropped image).
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*/
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class LTSWIDGETS_EXPORT LtsImageCropper : public QGraphicsView
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{
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Q_OBJECT
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Q_PROPERTY(QPixmap pixMap READ pixmap WRITE setPixmap)
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Q_PROPERTY(double multiplier READ multiplier WRITE setMultiplier)
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Q_PROPERTY(double maxZoom READ maxZoom WRITE setMaxZoom)
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public:
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/**
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* @brief ImageCropper
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* @param parent
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* @param size specifies the size of the graphicsview widget, aswell as the size of the cropped image.
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* @param image to crop
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*/
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LtsImageCropper(QWidget *parent = nullptr, const QSize &size = {} , const QPixmap &pixmap = {});
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~LtsImageCropper();
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/**
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* @brief setter for image
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* @param image
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*/
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void setPixmap(const QPixmap &pixmap);
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/**
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* @brief setter for image
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* @param image
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*/
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void setImage(const QImage &image);
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/**
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* @brief set the zoom mutliplier for mwheel scaling e.g. 1.03.
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* @param multiplier
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*/
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void setMultiplier(double multiplier);
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/**
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* @brief set the maximum zoom in scale e.g. 2.0 = 200% zoom in.
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* @param maxZoom
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*/
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void setMaxZoom(double maxZoom) { m_maxScale = maxZoom; }
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/**
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* @brief returns the current graphicsview view as a pixmap.
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* @return qpixmap
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*/
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QPixmap pixmap() { return grab(); }
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/**
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* @brief returns the current graphicsview view as qimage.
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* @return qimage
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*/
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QImage image();
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/**
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* @brief returns the current multiplier
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* @return double
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*/
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double multiplier() const { return m_multiplier; }
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/**
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* @brief returns the current max zoom value
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* @return double
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*/
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double maxZoom() const { return m_maxScale; }
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private:
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QGraphicsScene *m_scene = nullptr;
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QGraphicsPixmapItem *m_pixmapItem = nullptr;
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double m_currentZoom;
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double m_minScale;
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double m_maxScale;
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double m_stepScale;
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double m_multiplier;
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void calculateScaleStep();
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protected:
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void wheelEvent(QWheelEvent *event) override;
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void mousePressEvent(QMouseEvent *event) override;
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void mouseReleaseEvent(QMouseEvent *event) override;
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};
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} // namespace LtsWidgets
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