VTK例子23-用鼠标获取二维图像中某点的坐标值

medimage

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[2];

        viewerinter->GetEventPosition (selPt);

        printf("X: %d, Y: %d\n",selPt[0],selPt[1]);

        float temp=dr->GetOutput()->GetScalarComponentAsFloat(selPt[0],selPt[1],0,0);

        printf("像素为:  %f\n",temp);

        style->OnLeftButtonDown();

}

void MyExecute(vtkObject *caller, unsigned long eid, void *clientdata, void *calldata)

{

    double selPt[3];

        picker->GetSelectionPoint(selPt);

        printf("X:  %f, Y:  %f\n",selPt[0],selPt[1]);

        float temp=dr->GetOutput()->GetScalarComponentAsFloat(selPt[0],selPt[1],0,0);

        printf("像素为:  %d\f",temp);

/*

        double globalCoordinate[3];

        picker->GetPickPosition(globalCoordinate);

        printf("X:  %f, Y:  %f, Z:  %f\n",

                   globalCoordinate[0],globalCoordinate[1],globalCoordinate[2]);

*/

        style->OnLeftButtonDown();

}

李孟

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