Qt下的自定义图像显示控件

#include "imagewidget.h" #include <QDebug> ImageWidget::ImageWidget(QWidget *parent) : QWidget(parent) { m_nw=m_nh=m_niw=m_nih=0; m_dScale_tmp=m_dScaleW=m_dScaleH=m_adjust_x=m_adjust_y=0.0; m_myColorTable.resize(256); for(int i = 0; i<256; i++) m_myColorTable[i] = qRgb(i,i,i); m_older_move_x= m_move_x=0; m_older_move_y= m_move_y=0; m_mousePressPoint=QPoint(0,0); m_mouseReleasePoint=QPoint(0,0); m_mouseMovePoint=QPoint(0,0); m_scale=1; setImage(QImage("test.jpg")); m_Edisplaystyle=EDisplayStyle::FITWINDOW; m_painter=new QPainter(this); m_EmouseOpstatus=MOS_ADJUST_SIZE; m_pen_size=4; m_bMoveFlag=false; m_penCursor=QPixmap("pen.png"); m_xpcCursor=QPixmap("xpc.png"); m_penQCursor=QCursor(m_penCursor,0,m_penCursor.height()); m_xpcQCursor=QCursor(m_xpcCursor,0,m_xpcCursor.height()); } void ImageWidget::setDisplayStyle(EDisplayStyle _style) { m_Edisplaystyle=_style; } void ImageWidget::setMouseOpstatus(EmouseOpStatus _EmouseOpstatus) { m_EmouseOpstatus=_EmouseOpstatus; } ImageWidget::~ImageWidget() { } void ImageWidget::paintEvent(QPaintEvent * event) { Q_UNUSED(event); QPainter painter_tmp(this); //第一步 画图片 drawImage(&painter_tmp); } void ImageWidget::setImage(QImage &image) { QMutexLocker lock(&m_mutex); if (image.isNull()) { return; } if (m_DisplayImage.isNull()||m_DisplayImage.size()!=image.size()||m_DisplayImage.format()!=image.format()) { m_OriginalImage=m_DisplayImage=image; return; } int bpp = image.depth()/8; setImage(image.bits(),image.width()*image.height()*bpp,image.width(),image.height()); } void ImageWidget::setImage(const uchar *data, int data_length, int width, int height) { //得到图像的位深 int Dst_bpp=m_DisplayImage.depth()/8; int Src_bpp=data_length/(width*height); //如果当前图像的大小和位深和要显示的图像一样则直接内存拷贝就行 if (Dst_bpp==Src_bpp&&m_DisplayImage.width()==width&&m_DisplayImage.height()==height) { memcpy(m_DisplayImage.bits(),data,data_length); } else { QImage::Format fmt; //否则，就要确定图像的类型 switch (Src_bpp) { case 1: fmt=QImage::Format_Indexed8; break; case 3: fmt=QImage::Format_RGB888; break; case 4: fmt=QImage::Format_ARGB32; break; default: return; } //重新为图像赋值 m_DisplayImage=QImage(data,width,height,fmt); if (fmt==QImage::Format_Indexed8) { m_DisplayImage.setColorTable(m_myColorTable); } } this->update(); } void ImageWidget::setCircleVtr(std::vector<QPoint> _circleVtr) { m_circleVtr=_circleVtr; update(); } void ImageWidget::mousePressEvent(QMouseEvent *event) { m_mousePressPoint=event->pos(); //m_mouseMovePoint=QPoint(-1,-1); m_mouseReleasePoint=QPoint(-1,-1); if (event->button()==Qt::RightButton) { switch (m_EmouseOpstatus) { case MOS_NONE: break; default: m_EmouseOpstatus=MOS_ADJUST_SIZE; break; } } else if (event->button()==Qt::LeftButton) { switch (m_EmouseOpstatus) { case MOS_NONE: break; case MOS_ADJUST_SIZE: m_bMoveFlag=true; default: break; } } update(); } void ImageWidget::mouseMoveEvent(QMouseEvent *event) { m_mouseMovePoint=event->pos(); switch (m_EmouseOpstatus) { case ImageWidget::MOS_NONE: break; case ImageWidget::MOS_ADJUST_SIZE: if (m_bMoveFlag) { m_move_x=m_mouseMovePoint.x()-m_mousePressPoint.x(); m_move_y=m_mouseMovePoint.y()-m_mousePressPoint.y(); } break; default: break; } update(); } void ImageWidget::mouseReleaseEvent(QMouseEvent *event) { if (event->button()==Qt::LeftButton) { m_mouseReleasePoint=event->pos(); switch (m_EmouseOpstatus) { case ImageWidget::MOS_NONE: break; case ImageWidget::MOS_ADJUST_SIZE: m_move_x=m_mouseReleasePoint.x()-m_mousePressPoint.x(); m_move_y=m_mouseReleasePoint.y()-m_mousePressPoint.y(); m_older_move_x+=m_move_x; m_older_move_y+=m_move_y; m_move_x=0; m_move_y=0; m_bMoveFlag=false; break; default: break; } } update(); } void ImageWidget::wheelEvent(QWheelEvent * event) { //得到滚轮转动的数值 QPoint numDegrees = event->angleDelta() / 8; double iw=m_DisplayImage.width(); double ih=m_DisplayImage.height(); if (numDegrees.y()>0) { if (m_EmouseOpstatus==MOS_ADJUST_SIZE) { m_scale+=0.2; //放大比例增加0.2 /* //保证以图片中心作为缩放中心 m_older_move_x-=0.2*(iw/2); m_older_move_y-=0.2*(ih/2); */ } } else { if (m_EmouseOpstatus==MOS_ADJUST_SIZE) { m_scale-=0.2; if(m_scale<0.2) { m_scale=0.2; } else { /* m_older_move_x+=0.2*(iw/2); m_older_move_y+=0.2*(ih/2); */ } } } update(); } bool ImageWidget::validatePosInImage(QPoint pos) { if (m_DisplayImage.isNull()) { return false; } //将点击位置转换到图像上 QPoint mapPos=m_matrix.inverted().map(pos); //获取图片大小 double iw=m_DisplayImage.width(); double ih=m_DisplayImage.height(); QRect imgRect(0,0,iw,ih); //判断是否在图像内 return imgRect.contains(mapPos); } //绘制图片 void ImageWidget::drawImage(QPainter* painter) { //设置画布大小 QPixmap buff(this->size()); //设置画笔 QPainter p(&buff); p.setRenderHint(QPainter::SmoothPixmapTransform); //记录图片的缩放比例 if (!m_DisplayImage.isNull()) { //得到控件大小 m_nw =this->width(); m_nh=this->height(); //得到图片大小 m_niw=m_DisplayImage.width(); m_nih=m_DisplayImage.height(); if (m_Edisplaystyle==FITWINDOW) { //计算控件和图片的比例 m_dScaleW=(double)m_nw/(double)m_niw; m_dScaleH=(double)m_nh/(double)m_nih; //取小比例，保证图片完全显示在控件内 m_dScaleW=m_dScaleH=qMin(m_dScaleW,m_dScaleH); //放大或者缩小图片 m_dScale_tmp=m_scale*m_dScaleW; m_niw*=m_dScaleW; m_nih*=m_dScaleW; //调整图片在控件出现的位置 m_adjust_x=-(m_niw-m_nw)/2+m_older_move_x+m_move_x ; m_adjust_y=-(m_nih-m_nh)/2+m_older_move_y+m_move_y ; } else { m_dScale_tmp=m_scale; m_adjust_x=-(m_niw-m_nw)/2+m_older_move_x+m_move_x; m_adjust_y=-(m_nih-m_nh)/2+m_older_move_y+m_move_y; } //计算画笔的绘制的转换矩阵 m_matrix=QMatrix().translate(m_adjust_x,m_adjust_y).scale(m_dScale_tmp,m_dScale_tmp); p.setMatrix(m_matrix); p.drawPixmap(0,0,QPixmap::fromImage(m_DisplayImage)); } //绘制图片 painter->drawPixmap(0,0,buff); } //获得当前显示的图片 QImage ImageWidget::getDisplayImage() { QMutexLocker lock(&m_mutex); return m_DisplayImage; } //设置画笔大小 void ImageWidget::setPenSize(int size) { m_pen_size=size; } void ImageWidget::initSize() { m_older_move_x= m_move_x=0; m_older_move_y= m_move_y=0; m_scale=1; update(); }