[Qt5开发及实例第2版-第5章Qt.ppt

5.3.2 旋转功能 （4）在头文件中添加“protected slots:”变量： void ShowRotate180(); void ShowRotate270(); （5）在createActions()函数的最后添加事件关联： connect(rotate180Action,SIGNAL(triggered()),this,SLOT(ShowRotate180())); connect(rotate270Action,SIGNAL(triggered()),this,SLOT(ShowRotate270())); Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 5.3.2 旋转功能 （6）ShowRotate180()、ShowRotate270()函数的具体实现代码如下： void ImgProcessor::ShowRotate180() { if(img.isNull()) return; QMatrix matrix; matrix.rotate(180); img = img.transformed(matrix); showWidget-imageLabel-setPixmap(QPixmap::fromImage(img)); } void ImgProcessor::ShowRotate270() { if(img.isNull()) return; QMatrix matrix; matrix.rotate(270); img = img.transformed(matrix); showWidget-imageLabel-setPixmap(QPixmap::fromImage(img)); } Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 5.3.2 旋转功能 （7）运行程序，单击“旋转”→“旋转90°”命令或单击工具栏上的 按钮，图像旋转效果如图5.8所示。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 5.3.3 镜像功能 （1）在头文件中添加“protected slots:”变量： void ShowMirrorVertical(); void ShowMirrorHorizontal(); （2）在createActions()函数的最后添加事件关联： connect(mirrorVerticalAction,SIGNAL(triggered()),this,SLOT(ShowMirror Vertical())); connect(mirrorHorizontalAction,SIGNAL(triggered()),this,SLOT(ShowMirrorHorizontal())); Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 5.3.3 镜像功能 （3）ShowMirrorVertical ()、ShowMirrorHorizontal ()函数的具体实现代码如下： void ImgProcessor::ShowMirrorVertical() { if(img.isNull()) return; img=img.mirrored(false,true); showWidget-imageLabel-setPixmap(QPixmap::fromImage(img)); } void ImgProcessor::ShowMirrorHorizontal() { if(img.isNull()) return; img=img.mirrored(true,false); showWidget-imageLabel-setPix