medimage 发表于 2015-12-6 12:30:30

VTK例子23-用鼠标获取二维图像中某点的坐标值

用鼠标获取二维图像中某点的坐标值#include "stdafx.h"/*用鼠标获取二维图像中某点的坐标值
解决方法如下1.把窗口二维坐标转换为空间三维坐标, 用个vtkWorldPointPicker 就可以了2.利用图像点和三维空间坐标的映射关系,把空间三维坐标, 转换为图像像素位置(i,j,k)3.i,j,k 一般情况都是浮点数,利用差值算法( 临近, 线性等)计算出此点对应的像素值其实任何时候都可以使用vtkRenderWindowInteractor中的GetEventPosition ();来获取鼠标位置的坐标。不需要那么多转换*/#include <iostream>#include "vtkRenderWindow.h"#include "vtkCamera.h"#include "vtkActor.h"#include "vtkRenderer.h"#include "vtkDICOMImageReader.h"#include "vtkImageViewer.h"#include "vtkInteractorStyleTrackballCamera.h"#include "vtkRenderWindowInteractor.h"#include "vtkImageViewer.h"#include "vtkImageActor.h"#include "vtkImageCast.h"#include "vtkPointPicker.h"#include "vtkCallbackCommand.h"#include "vtkImageData.h"
void left(vtkObject *caller, unsigned long eid, void *clientdata, void *calldata);void MyExecute(vtkObject *caller, unsigned long eid, void *clientdata, void *calldata);vtkPointPicker *picker;vtkInteractorStyleTrackballCamera *style;vtkRenderWindowInteractor *viewerinter;vtkDICOMImageReader   *dr;int main(){    dr =vtkDICOMImageReader::New();          dr->SetDataByteOrderToLittleEndian();          dr->SetFileName("C://DATADIR/brain/brain_007.dcm");          dr->SetDataOrigin(0.0,0.0,0.0);    vtkImageViewer*viewer = vtkImageViewer::New();          viewer->SetInput(dr->GetOutput());          viewer->SetColorWindow(1024);//这就是传说中的窗宽          viewer->SetColorLevel(512/2);//窗位          viewer->Render();    viewerinter = vtkRenderWindowInteractor::New();          viewer->SetupInteractor(viewerinter);      picker=vtkPointPicker::New();    vtkCallbackCommand * cmd1 = vtkCallbackCommand::New();          cmd1->SetCallback(MyExecute);          picker->AddObserver(vtkCommand::EndPickEvent, cmd1);          viewerinter->SetPicker(picker);    style=vtkInteractorStyleTrackballCamera::New();          viewerinter-> SetInteractorStyle(style);    vtkCallbackCommand * cmd = vtkCallbackCommand::New();            cmd->SetCallback(left);              style-> AddObserver (vtkCommand::LeftButtonPressEvent,cmd);      viewerinter->Initialize();    viewerinter->Start();         return 0;}void left(vtkObject *caller, unsigned long eid, void *clientdata, void *calldata){    int selPt;      viewerinter->GetEventPosition (selPt);      printf("X: %d, Y: %d\n",selPt,selPt);      float temp=dr->GetOutput()->GetScalarComponentAsFloat(selPt,selPt,0,0);      printf("像素为:%f\n",temp);      style->OnLeftButtonDown();}void MyExecute(vtkObject *caller, unsigned long eid, void *clientdata, void *calldata){    double selPt;      picker->GetSelectionPoint(selPt);      printf("X:%f, Y:%f\n",selPt,selPt);      float temp=dr->GetOutput()->GetScalarComponentAsFloat(selPt,selPt,0,0);      printf("像素为:%d\f",temp);/*      double globalCoordinate;       picker->GetPickPosition(globalCoordinate);      printf("X:%f, Y:%f, Z:%f\n",                   globalCoordinate,globalCoordinate,globalCoordinate);*/      style->OnLeftButtonDown();}

李孟 发表于 2016-4-6 12:36:20

谢谢楼主分享！！！

linac 发表于 2016-5-11 08:59:54

学习学习。。。

biochemistry 发表于 2016-5-11 18:38:30

留个脚印

oevko 发表于 2016-5-15 20:30:54

谢谢楼主！

不再妄想 发表于 2016-5-21 08:52:06

看看学习一下！

dentaldev 发表于 2016-5-23 00:57:48

次贴无用,检定完毕!
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