132 lines
2.8 KiB
C++
Executable File
132 lines
2.8 KiB
C++
Executable File
|
|
|
|
|
|
#include "lts_image_cropper.h"
|
|
#include <QGraphicsItem>
|
|
#include <QMouseEvent>
|
|
#include <QApplication>
|
|
|
|
namespace LtsWidgets
|
|
{
|
|
|
|
LtsImageCropper::LtsImageCropper(QWidget *parent, const QSize &size, const QPixmap &pixmap)
|
|
: QGraphicsView(parent)
|
|
, m_scene(new QGraphicsScene(this))
|
|
, m_maxScale(2.0f)
|
|
, m_multiplier(1.0f)
|
|
{
|
|
if(!size.isNull())
|
|
setFixedSize(size);
|
|
|
|
setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
|
|
setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
|
|
setFrameStyle(QFrame::NoFrame);
|
|
setDragMode(QGraphicsView::ScrollHandDrag);
|
|
setTransformationAnchor(QGraphicsView::AnchorViewCenter);
|
|
|
|
m_scene->setBackgroundBrush(Qt::Dense6Pattern);
|
|
setScene(m_scene);
|
|
|
|
setPixmap(pixmap);
|
|
}
|
|
|
|
LtsImageCropper::~LtsImageCropper()
|
|
{
|
|
delete m_pixmapItem;
|
|
}
|
|
|
|
void LtsImageCropper::setPixmap(const QPixmap &pixmap)
|
|
{
|
|
if(pixmap.isNull())
|
|
return;
|
|
|
|
delete m_pixmapItem;
|
|
|
|
m_pixmapItem = new QGraphicsPixmapItem(pixmap);
|
|
m_scene->addItem(m_pixmapItem);
|
|
|
|
setTransform(QTransform());
|
|
m_currentZoom = 1.0;
|
|
|
|
|
|
double sx = static_cast<double>(size().height()) / pixmap.height();
|
|
double sy = static_cast<double>(size().width()) / pixmap.width();
|
|
if(sx > 1 )
|
|
scale(sx,sx);
|
|
if(sy > 1)
|
|
scale(sy,sy);
|
|
|
|
|
|
double ratioWidth = 1.0 * size().width() / pixmap.width();
|
|
double ratioHeight = 1.0 * size().height() / pixmap.height();
|
|
m_minScale = qMax(ratioHeight,ratioWidth);
|
|
|
|
calculateScaleStep();
|
|
|
|
|
|
m_scene->setSceneRect(pixmap.rect());
|
|
centerOn(m_scene->sceneRect().center());
|
|
}
|
|
|
|
void LtsImageCropper::setImage(const QImage &image)
|
|
{
|
|
setPixmap(QPixmap::fromImage(image));
|
|
}
|
|
|
|
void LtsImageCropper::setMultiplier(double multiplier)
|
|
{
|
|
m_multiplier = multiplier;
|
|
calculateScaleStep();
|
|
}
|
|
|
|
void LtsImageCropper::calculateScaleStep()
|
|
{
|
|
m_stepScale = (m_maxScale - m_minScale) / 100.0;
|
|
}
|
|
|
|
QImage LtsImageCropper::image()
|
|
{
|
|
return grab().toImage();
|
|
}
|
|
|
|
void LtsImageCropper::wheelEvent(QWheelEvent *event)
|
|
{
|
|
if(!m_pixmapItem)
|
|
return;
|
|
|
|
auto value = event->pixelDelta();
|
|
if(value.isNull())
|
|
value = event->angleDelta() / 15.0;
|
|
|
|
|
|
double scrollZoom = m_stepScale * value.y() * m_multiplier / 8.0;
|
|
|
|
m_currentZoom += scrollZoom;
|
|
|
|
if(m_currentZoom > m_maxScale)
|
|
m_currentZoom = m_maxScale;
|
|
else if (m_currentZoom < m_minScale)
|
|
m_currentZoom = m_minScale;
|
|
|
|
|
|
setTransform(QTransform(m_currentZoom, transform().m12(), transform().m13(),
|
|
transform().m21(), m_currentZoom, transform().m23(),
|
|
transform().m31(), transform().m32(), 1));
|
|
}
|
|
|
|
void LtsImageCropper::mousePressEvent(QMouseEvent *event)
|
|
{
|
|
QApplication::setOverrideCursor(Qt::DragMoveCursor);
|
|
update();
|
|
QGraphicsView::mousePressEvent(event);
|
|
}
|
|
|
|
void LtsImageCropper::mouseReleaseEvent(QMouseEvent *event)
|
|
{
|
|
QApplication::restoreOverrideCursor();
|
|
update();
|
|
QGraphicsView::mouseReleaseEvent(event);
|
|
}
|
|
|
|
}
|