#include "imageview.h"
#include <QDebug>

ImageView::ImageView(QWidget *parent)
    : QGraphicsView(parent),
    rubberBand(nullptr)
{
    scene = new QGraphicsScene(this);
    setScene(scene);
    pximg = new QGraphicsPixmapItem();
    scene->addItem(pximg);


    setDragMode(QGraphicsView::NoDrag);
    setRenderHint(QPainter::Antialiasing);

    // 设置视图属性
    setHorizontalScrollBarPolicy(Qt::ScrollBarAsNeeded);
    setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
    setTransformationAnchor(QGraphicsView::AnchorUnderMouse);
    setResizeAnchor(QGraphicsView::AnchorUnderMouse);
    state = false;
}



void ImageView::mousePressEvent(QMouseEvent *event)
{
    if (event->button() == Qt::LeftButton && pximg)
    {
        origin = event->pos();
        if (!rubberBand)
            rubberBand = new QRubberBand(QRubberBand::Rectangle, this);
        rubberBand->setGeometry(QRect(origin, QSize()));
        rubberBand->show();
    }
    if(event->button()==Qt::RightButton){
        state = false;
    }
    QGraphicsView::mousePressEvent(event);
}

void ImageView::mouseMoveEvent(QMouseEvent *event)
{
    if (rubberBand && rubberBand->isVisible())
    {
        rubberBand->setGeometry(QRect(origin, event->pos()).normalized());
    }
    QGraphicsView::mouseMoveEvent(event);
}

void ImageView::mouseReleaseEvent(QMouseEvent *event)
{
    if (event->button() == Qt::LeftButton && rubberBand && pximg)
    {
        rubberBand->hide();

        // 获取ROI区域（视图坐标）
        QRect roiRect = rubberBand->geometry();

        // 转换为场景坐标
        QPointF topLeft = mapToScene(roiRect.topLeft());
        QPointF bottomRight = mapToScene(roiRect.bottomRight());
        QRectF sceneRect(topLeft, bottomRight);

        // 确保在图片范围内
        QRectF imageRect = pximg->boundingRect();
        sceneRect = sceneRect.intersected(imageRect);

        if (!sceneRect.isEmpty())
        {
            // 发出信号
            qDebug()<<"跟踪清除";
            emit roiSelected(sceneRect);
            // qDebug() << "ROI Selected - Position:" << sceneRect.topLeft()
            //          << "Size:" << sceneRect.size();
        }
    }
    QGraphicsView::mouseReleaseEvent(event);
}