【Qt5开发及实例】14、实现一个简单的文本编辑器3

来源：互联网发布：程序员算法题编辑：程序博客网时间：2024/06/05 08:01

实现文本编辑器的图片旋转功能

基础界面实现：http://blog.csdn.net/cutter_point/article/details/42839071

首先在原来的基础上添加槽函数：

  void ShowRotate90();    //旋转90度  void ShowRotate180();   //180度  void ShowRotate270();   //270度

函数连接：

  //实现图片的选择动作  //旋转90°  rotate90Action = new QAction(QIcon(":/rotate90.png"), tr("get rotate90"), this);  rotate90Action->setStatusTip(tr("get rotate90 image"));  connect(rotate90Action, SIGNAL(triggered()), this, SLOT(ShowRotate90()));  //180°  rotate180Action = new QAction(QIcon(":/rotate180.png"), tr("get rotate180"), this);  rotate180Action->setStatusTip(tr("get rotate180 image"));  connect(rotate180Action, SIGNAL(triggered()), this, SLOT(ShowRotate180()));  //270°  rotate270Action = new QAction(QIcon(":/rotate270.png"), tr("get rotate270"), this);  rotate270Action->setStatusTip(tr("get rotate270 image"));  connect(rotate270Action, SIGNAL(triggered()), this, SLOT(ShowRotate270()));

槽函数的具体实现：

//旋转270度void ImageProcessor::ShowRotate270(){  if(img.isNull())    return;  QMatrix matrix;  matrix.rotate(270);    //旋转90度  img = img.transformed(matrix);    //图像旋转之后再重新得到赋值  showWidget->imageLabel->setPixmap(QPixmap::fromImage(img));}//旋转180度void ImageProcessor::ShowRotate180(){  if(img.isNull())    return;  QMatrix matrix;  matrix.rotate(180);    //旋转90度  img = img.transformed(matrix);    //图像旋转之后再重新得到赋值  showWidget->imageLabel->setPixmap(QPixmap::fromImage(img));}//旋转90度void ImageProcessor::ShowRotate90(){  if(img.isNull())    return;  QMatrix matrix;  matrix.rotate(90);    //旋转90度  img = img.transformed(matrix);    //图像旋转之后再重新得到赋值  showWidget->imageLabel->setPixmap(QPixmap::fromImage(img));}

实现结果：

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