146 lines
4.6 KiB
C++
146 lines
4.6 KiB
C++
#include "qimagewidget.h"
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#include <QGraphicsSceneMouseEvent>
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#include <QGraphicsSceneDragDropEvent>
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#include <QPointF>
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#include <QDebug>
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#include <QDrag>
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#include <QLabel>
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#include <QWidgetAction>
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#include <QMenu>
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#include <math.h>
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QImageWidget::QImageWidget(QImage* pixmap)
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{
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m_pix = *pixmap;
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//setAcceptDrops(true);//If enabled is true, this item will accept hover events; otherwise, it will ignore them. By default, items do not accept hover events.
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m_scaleValue = 0;
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m_scaleDafault = 0;
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m_isMove = false;
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}
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QRectF QImageWidget::boundingRect() const
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{
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return QRectF(-m_pix.width() / 2, -m_pix.height() / 2,
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m_pix.width(), m_pix.height());
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}
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void QImageWidget::paint(QPainter* painter, const QStyleOptionGraphicsItem*,
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QWidget*)
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{
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painter->setRenderHints(QPainter::SmoothPixmapTransform);//消锯齿
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painter->drawImage(-m_pix.width() / 2, -m_pix.height() / 2, m_pix);
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}
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void QImageWidget::mousePressEvent(QGraphicsSceneMouseEvent* event)
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{
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if (event->button() == Qt::LeftButton)
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{
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m_startPos = event->pos();//鼠标左击时，获取当前鼠标在图片中的坐标，
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m_isMove = true;//标记鼠标左键被按下
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GetImagepix(m_startPos);
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}
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else if (event->button() == Qt::RightButton)
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{
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ResetItemPos();//右击鼠标重置大小
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}
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}
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void QImageWidget::mouseMoveEvent(QGraphicsSceneMouseEvent* event)
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{
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if (m_isMove)
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{
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QPointF point = (event->pos() - m_startPos) * m_scaleValue;
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moveBy(point.x(), point.y());
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}
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}
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void QImageWidget::mouseReleaseEvent(QGraphicsSceneMouseEvent*)
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{
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m_isMove = false;//标记鼠标左键已经抬起
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}
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void QImageWidget::wheelEvent(QGraphicsSceneWheelEvent* event)//鼠标滚轮事件
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{
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if ((event->delta() > 0) && (m_scaleValue >= m_max_zoomState))//最大放大到原始图像的50倍
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{
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return;
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}
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else if ((event->delta() < 0) && (m_scaleValue <= m_scaleDafault))//图像缩小到自适应大小之后就不继续缩小
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{
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ResetItemPos();//重置图片大小和位置，使之自适应控件窗口大小
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}
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else
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{
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qreal qrealOriginScale = m_scaleValue;
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if (event->delta() > 0)//鼠标滚轮向前滚动
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{
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m_scaleValue *= 1 + m_zoom;//每次放大10%
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}
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else
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{
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m_scaleValue *= 1 - m_zoom;//每次缩小10%
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}
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setScale(m_scaleValue);//缩放基准是固定的，即对原图元缩放，无累加
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if (event->delta() > 0)
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{
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moveBy(-event->pos().x() * qrealOriginScale * m_zoom, -event->pos().y() * qrealOriginScale * 0.1);//使图片缩放的效果看起来像是以鼠标所在点为中心进行缩放的
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}
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else
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{
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moveBy(event->pos().x() * qrealOriginScale * m_zoom, event->pos().y() * qrealOriginScale * 0.1);//使图片缩放的效果看起来像是以鼠标所在点为中心进行缩放的
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}
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}
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}
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//将主界面的控件QGraphicsView的width和height传进本类中，并根据图像的长宽和控件的长宽的比例来使图片缩放到适合控件的大小
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void QImageWidget::setQGraphicsViewWH(int nwidth, int nheight)
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{
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int nImgWidth = m_pix.width();
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int nImgHeight = m_pix.height();
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qreal temp1 = nwidth * 1.0 / nImgWidth;
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qreal temp2 = nheight * 1.0 / nImgHeight;
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if (temp1 > temp2)
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{
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m_scaleDafault = temp2;
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}
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else
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{
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m_scaleDafault = temp1;
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}
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setScale(m_scaleDafault);
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m_scaleValue = m_scaleDafault;
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}
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void QImageWidget::GetImagepix(QPointF pos)
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{
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int a = pos.x() + m_pix.width() / 2;
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int b = pos.y() + m_pix.height() / 2;
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if (m_pix.isNull())return;
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if (m_pix.valid(a, b)) {
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QColor color = m_pix.pixel(a, b);
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QString clo = QString("RGB: %1, %2, %3").arg(color.red()).arg(color.green()).arg(color.blue());
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QString ps = QString("XY:(%1,%2) %3").arg(a).arg(b).arg(clo);
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emit SetImagepix(ps);
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}
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// QMenu* menu = new QMenu();
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// menu->setStyleSheet("QMenu { background-color:rgb(3,101,100); border: 5px solid rgb(3,54,73); }");
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// QLabel* label=new QLabel(menu);
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// label->setText(ps);
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// QWidgetAction* another_widgetAction = new QWidgetAction(menu);
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// another_widgetAction->setDefaultWidget(label);
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// menu->addAction(another_widgetAction);
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// menu->exec(QCursor::pos());
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// delete menu;
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}
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//重置图片位置
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void QImageWidget::ResetItemPos()
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{
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m_scaleValue = m_scaleDafault;//缩放比例回到一开始的自适应比例
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setScale(m_scaleDafault);//缩放到一开始的自适应大小
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setPos(0, 0);
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}
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qreal QImageWidget::getScaleValue() const
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{
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return m_scaleValue;
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}
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