2：QT联合HALCON编程—图像显示放大缩小

1.声明事件

#include <HalconCpp.h>
using namespace HalconCpp;#include <QCloseEvent>//滚轮事件

2.在.h文件中声明和定义公共全局变量，以及图像缩放的函数

            void wheelEvent(QWheelEvent *event);//定义函数HTuple wcRow0, wcRow1, wcCol0, wcCol1,m_objImage;bool GunLunFlag = false;HObject  ho_Image;

3.在.cpp文件中，构造函数中

   GunLunFlag = true; //变量变为1

4.在.cpp的函数中开始定义

              使用此函数时，需要替换窗口名和图像名。（如果在别处也需要使用这两个变量，所以才把这些变量声明到全局变量中去）

        HTuple hv_WindowHandle;  //公共窗口  大家都会去使用  全局作用域（在联合编程1节里面有提到）

       

//滚轮事件函数
void MainWindow::wheelEvent(QWheelEvent *event)
{if(ui->gvDepthMap->geometry().contains(this->mapFromGlobal(QCursor::pos()))){//resizeImage();SetWindowExtents(hv_hv_WindowHandle, 0, 0,  ui->gvDepthMap->width(), ui->gvDepthMap->height());try{if (GunLunFlag == true){QPoint pos = event->pos();HTuple Row0_1, Col0_1, Row1_1, Col1_1;HTuple ImagePtX, ImagePtY;QRect WndRect;double Scale = 0.1;HTuple Width, Height;GetImageSize(ho_Image, &Width, &Height);WndRect = QRect(QPoint(0, 0), QPoint(ui->gvDepthMap->width(), ui->gvDepthMap->height()));if (WndRect.contains(event->pos())){if (event->delta() > 0){ImagePtX = wcCol0 + (pos.x() - WndRect.left()) / (WndRect.width() - 1.0) * (wcCol1 - wcCol0);ImagePtY = wcRow0 + (pos.y() - WndRect.top()) / (WndRect.height() - 1.0) * (wcRow1 - wcRow0);Row0_1 = ImagePtY - 1 / (1 - Scale) * (ImagePtY - wcRow0);Row1_1 = ImagePtY - 1 / (1 - Scale) * (ImagePtY - wcRow1);Col0_1 = ImagePtX - 1 / (1 - Scale) * (ImagePtX - wcCol0);Col1_1 = ImagePtX - 1 / (1 - Scale) * (ImagePtX - wcCol1);wcRow0 = Row0_1;wcCol0 = Col0_1;wcRow1 = Row1_1;wcCol1 = Col1_1;if (wcRow0 < 0 || wcCol0 < 0){wcRow0 = 0;wcCol0 = 0;wcRow1 = Height;wcCol1 = Width;}ClearWindow(hv_hv_WindowHandle);SetPart(hv_hv_WindowHandle, wcRow0, wcCol0, wcRow1, wcCol1);DispObj(ho_Image, hv_hv_WindowHandle);}else{ImagePtX = wcCol0 + (pos.x() - WndRect.left()) / (WndRect.width() - 1.0) * (wcCol1 - wcCol0);ImagePtY = wcRow0 + (pos.y() - WndRect.top()) / (WndRect.height() - 1.0) * (wcRow1 - wcRow0);Row0_1 = ImagePtY - 1 / (1 + Scale) * (ImagePtY - wcRow0);Row1_1 = ImagePtY - 1 / (1 + Scale) * (ImagePtY - wcRow1);Col0_1 = ImagePtX - 1 / (1 + Scale) * (ImagePtX - wcCol0);Col1_1 = ImagePtX - 1 / (1 + Scale) * (ImagePtX - wcCol1);wcRow0 = Row0_1;wcCol0 = Col0_1;wcRow1 = Row1_1;wcCol1 = Col1_1;}ClearWindow(hv_hv_WindowHandle);SetPart(hv_hv_WindowHandle, wcRow0, wcCol0, wcRow1, wcCol1);DispObj(ho_Image, hv_hv_WindowHandle);}}}catch(...){// ui->（可以添加界面框显示内容）return;}}
}

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