Qt实现图片处理器PictureEdit

目录 图片处理器PictureEdit1 创建工具栏2 打开图片3 显示图片4 灰度处理5 颜色反转6 马赛克

图片处理器PictureEdit

创建工程，添加资源文件

1 创建工具栏 widget.h中 #include <QWidget> #include<QPixmap> #include<QFileDialog> #include<QAction> #include<QToolBar> #include<QIcon> class QToolBar; private: void createTollBar(); private: QPixmap pic; QToolBar * toolBar; widget.cpp中 Widget::Widget(QWidget *parent) : QWidget(parent) { this->createTollBar(); this->resize(400,500); } 添加按钮及图标 void Widget::createTollBar() { this->toolBar = new QToolBar(this); //打开图片 QAction *openAct = new QAction(QIcon("://Icon/open.png"),"打开图片"); this->toolBar->addAction(openAct); //还原 QAction *recoverAct = new QAction(QIcon("://Icon/recover.png"),"还原图片"); this->toolBar->addAction(recoverAct); //灰图 QAction *grayAct = new QAction(QIcon("://Icon/gray.png"),"灰图处理"); this->toolBar->addAction(grayAct); //反转 QAction *invertnAct = new QAction(QIcon("://Icon/Invert colors.png"),"颜色反转"); this->toolBar->addAction(invertnAct); //模糊 QAction *blurAct = new QAction(QIcon("://Icon/blurring.png"),"模糊处理"); this->toolBar->addAction(blurAct); //马赛克 QAction *mosaicAct = new QAction(QIcon("://Icon/mosaic.png"),"马赛克处理"); this->toolBar->addAction(mosaicAct); //水墨 QAction *inkAct = new QAction(QIcon("://Icon/ink painting.png"),"水墨处理"); this->toolBar->addAction(inkAct); }

2 打开图片 在widget.h中添加槽 public slots: void openPic(); 在widget.cpp中实现 void Widget::openPic() { QString filePath = QFileDialog::getOpenFileName(this,"打开图片","./","image(*.png *.jpg *.bmp"); this->pic = QPixmap(filePath); this->resize(this->pic.size()); } 然后在createToolBar函数中连接 //打开图片 QAction *openAct = new QAction(QIcon("://Icon/open.png"),"打开图片"); //连接信号 connect(openAct,&QAction::triggered,this,&Widget::openPic); this->toolBar->addAction(openAct);

不过此时添加后图片还无法显示

3 显示图片 在widget.h中重写画图的虚函数 protected: //重写虚函数 void paintEvent(QPaintEvent *event) Q_DECL_OVERRIDE; widget.cpp void Widget::paintEvent(QPaintEvent *event) { //显示在当前窗口 QPainter p(this); //绘制图片 p.drawPixmap(0,0,this->pic.width(),this->pic.height(),this->pic); QWidget::paintEvent(event); }

4 灰度处理 widget.h void grayPic(); widget.cpp void Widget::grayPic() { QImage image = this->pic.toImage(); image.convertToFormat(QImage::Format_ARGB32);//转换成ARGB32以方便设置颜色 //分辨遍历长和宽，因为图片长方形 for(int i=0; i<=image.width();i++) { for(int j=0;j<image.height();j++) { //每个像素点都修改 QRgb pixel = image.pixel(i,j); //平均值 int avg = qGray(pixel); image.setPixel(i,j,qRgb(avg,avg,avg)); } } this->pic = QPixmap::fromImage(image); //重新画图 this->update(); } createToolBar函数，连接信号 //灰图 QAction *grayAct = new QAction(QIcon("://Icon/gray.png"),"灰图处理"); connect(grayAct,&QAction::triggered,this,&Widget::grayPic); this->toolBar->addAction(grayAct);

5 颜色反转 widget.h void invertnPic(); widget.cpp void Widget::invertnPic() { QImage image = this->pic.toImage(); image.convertToFormat(QImage::Format_ARGB32);//转换成ARGB32以方便设置颜色 //分辨遍历长和宽，因为图片长方形 for(int i=0; i<=image.width();i++) { for(int j=0;j<image.height();j++) { //每个像素点都修改 QColor pixel = image.pixelColor(i,j); int r = pixel.red(); int g = pixel.green(); int b = pixel.blue(); QColor newColor((255-r),(255,g),(255-b)); image.setPixelColor(i,j,newColor); } } this->pic = QPixmap::fromImage(image); //重新画图 this->update(); } createToolBar函数，连接信号 //反转 QAction *invertnAct = new QAction(QIcon("://Icon/Invert colors.png"),"颜色反转"); connect(invertnAct,&QAction::triggered,this,&Widget::invertnPic); this->toolBar->addAction(invertnAct);

6 马赛克 widget.h void mosaicPic(); widget.cpp void Widget::mosaicPic() { QImage image = this->pic.toImage(); image.convertToFormat(QImage::Format_ARGB32);//转换成ARGB32以方便设置颜色 //分辨遍历长和宽，因为图片长方形 int w = image.width()%SIZE; int h = image.height()%SIZE; for(int i=0; i<=image.width()-w;i+=SIZE) { for(int j=0;j<image.height()-h;j+=SIZE) { //每个像素点都修改 int r=0,g=0,b=0; for(int m = i;m<i+SIZE;m++) { for(int n = j;n<j+SIZE;n++) { QColor c = image.pixelColor(m,n); r+=c.red(); g+=c.green(); b+=c.blue(); } } QColor newColor(r/(SIZE*SIZE),g/(SIZE*SIZE),b/(SIZE*SIZE)); for(int m = i;m<i+SIZE;m++) { for(int n = j;n<j+SIZE;n++) { image.setPixelColor(m,n,newColor); } } } } this->pic = QPixmap::fromImage(image); //重新画图 this->update(); } createToolBar函数，连接信号 //马赛克 QAction *mosaicAct = new QAction(QIcon("://Icon/mosaic.png"),"马赛克处理"); connect(mosaicAct,&QAction::triggered,this,&Widget::mosaicPic); this->toolBar->addAction(mosaicAct);

createToolBar函数，连接信号 //马赛克 QAction *mosaicAct = new QAction(QIcon("://Icon/mosaic.png"),"马赛克处理"); connect(mosaicAct,&QAction::triggered,this,&Widget::mosaicPic); this->toolBar->addAction(mosaicAct);

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