在土石坝剖分程序的开发过程中,由于要用可视化的形式加约束,因此需要选一个点并加上标记,但在实际开发的过程中发现
加上标记后,在旋转的大坝的过程中,标记发生闪烁的现像,原因是因为标记和坝体单元的深度计算方法的不一样,这个问题应
该可以用setresoveconindepolytopoyoffset()解决,可惜这个函数在这里却失效了,算例代码如下
extern int x11,y11;
extern CRect rect;
vtkRenderer * ren;
vtkRenderWindow *renWin;
vtkMyCellPicker *picker;
vtkFollower *myactor;
//vtkPointPicker *picker;
vtkActor2D *actor2d;
class vtkMyCallback : public vtkCommand
{
public:
static vtkMyCallback *New()
{ return new vtkMyCallback; }
virtual void Execute(vtkObject *caller, unsigned long, void*)
{
vtkRenderWindowInteractor *ir = (vtkRenderWindowInteractor*)(caller);
int x = ir->GetEventPosition()[0];
int y = ir->GetEventPosition()[1];
picker->Pick(x,y,0.0,ren);
vtkAssemblyPath *path = NULL;
path = picker->GetPath();
if (!path)
{
return;
}
double cen[3];
// ( (vtkActor*)( path->GetFirstNode()->GetViewProp() ) )->GetMapper()->GetCenter(cen);
// double pos[3];
// ren->GetActiveCamera()->GetPosition(pos);
// vtkMapper *mm = ( (vtkActor*)( path->GetFirstNode()->GetViewProp() ) )->GetMapper();
// picker->InsertLine(pos,cen,0.01, path,(vtkProp3D*)( path->GetFirstNode()->GetViewProp() ),mm );
int id = picker->GetCellId();
CString str;
str.Format("%d",id);
// AfxMessageBox(str);
if (path != NULL)
{
( (vtkActor*)( path->GetFirstNode()->GetViewProp() ) )->GetProperty()->SetColor(1.0,0.0,0.0);
}
vtkCell *mycell = ( (vtkActor*)( path->GetFirstNode()->GetViewProp() ) )->GetMapper()->GetInput()->GetCell(id);
vtkPoints *mypoints = mycell->GetPoints();
int nid = mypoints->GetNumberOfPoints();
int idnum = 0;
double d = 0.0;
double d_v = 1000000;
for (int i = 0; i < nid; i++)
{
double m[4];
m[3] = 1.0;
mypoints->GetPoint(i,m);
ren->SetWorldPoint(m[0],m[1],m[2],m[3]);
ren->WorldToDisplay();
double ss[3];
ren->GetDisplayPoint(ss);
d = (ss[0] - x) * (ss[0] - x) + (ss[1] - y) * (ss[1] - y);
if (d < d_v)
{
d_v = d;
idnum = i;
}
}
double dd[4];
dd[3] = 1.0;
mypoints->GetPoint(idnum,dd);
myactor->SetPosition(dd);
// ren->SetWorldPoint(dd);
// ren->WorldToDisplay();
// ren->GetDisplayPoint(dd);
// actor2d->SetDisplayPosition(dd[0], dd[1]);
renWin->Render();
//
CString str1;
str1.Format("%d",idnum);
// AfxMessageBox(str1);
//
}
};
vtkMyCallback *myCommand;
CVTK::CVTK()
{
//在构造函数中把各个vtk对象连成通道
//////////////////////////读入数据
//在构造函数中把各个vtk对象连成通道
//////////////////////////////////
//选点改变艳色，并且改变ID
vtkSphereSource **Geometry = new vtkSphereSource*[5];
vtkPolyDataMapper **mapper = new vtkPolyDataMapper*[5];
vtkActor **actor = new vtkActor*[5];
ren = vtkRenderer::New();
renWin = vtkRenderWindow::New();
picker = new vtkMyCellPicker();
// picker = vtkPointPicker::New();
picker->SetTolerance(0.001);
vtkPoints *point = vtkPoints::New();
point->SetNumberOfPoints(3);
point->InsertPoint(0,0.0, 0.0, 0.0);
point->InsertPoint(1,10.0, 0.0, 0.0);
point->InsertPoint(2, 0.0, 10.0, 0.0);
vtkCellArray *cell = vtkCellArray::New();
vtkIdType num[] = {0, 1, 2};
cell->InsertNextCell(3,num);
vtkPolyData *data = vtkPolyData::New();
data->SetPoints(point);
data->SetPolys(cell);
vtkPolyDataMapper *polymapper = vtkPolyDataMapper::New();
polymapper->SetInput(data);
vtkActor *vtkactor = vtkActor::New();
vtkactor->SetMapper(polymapper);
vtkactor->GetProperty()->SetColor(0.8,0.1,0.0);
ren->AddActor(vtkactor);
vtkTextMapper *textmapper = vtkTextMapper::New();
textmapper->SetInput("#");
actor2d = vtkActor2D::New();
actor2d->SetMapper(textmapper);
// actor2d->SetDisplayPosition(100, 100);
ren->AddActor2D(actor2d);
vtkVectorText *mytext = vtkVectorText::New();
mytext->SetText("#");
vtkPolyDataMapper *mmapper = vtkPolyDataMapper::New();
mmapper->SetInput(mytext->GetOutput());
mmapper->SetResolveCoincidentTopologyToPolygonOffset();
myactor = vtkFollower::New();
myactor->SetMapper(mmapper);
myactor->GetProperty()->SetColor(0.0,1.0,0.0);
ren->AddActor(myactor);
for (int j = 0; j < 5; j++)
{
Geometry[j] = vtkSphereSource::New();
Geometry[j]->SetThetaResolution(16);
Geometry[j]->SetPhiResolution(8);
Geometry[j]->SetRadius(0.005);
Geometry[j]->SetCenter(j*0.1,0,0);
mapper[j] = vtkPolyDataMapper::New();
mapper[j]->SetInput(Geometry[j]->GetOutput());
actor[j] = vtkActor::New();
actor[j]->SetMapper(mapper[j]);
actor[j]->VisibilityOff();
ren->AddActor(actor[j]);
}
myCommand = vtkMyCallback::New();
iren = vtkRenderWindowInteractor::New();
style = new vtkMystyle();
vtkInteractorStyleTrackballCamera *style1 = vtkInteractorStyleTrackballCamera::New();
iren->SetInteractorStyle(style1);
iren->Disable();
iren->SetRenderWindow(renWin);
renWin->AddRenderer(ren);
/////////////////////////////////
}
CVTK::~CVTK()
{
renWin->Delete();
// renderer->Delete();
// iren->Delete();
// cone->Delete();
// coneMapper->Delete();
// coneActor->Delete();
}
void CVTK::BeginRenderOn(CStatic * aStatic)
{
CRect rect;
aStatic->GetClientRect(&rect);
renWin->SetSize(rect.Width(),rect.Height());
// renWin->SetWindowId(aStatic->m_hWnd );
renWin->SetParentId(aStatic->m_hWnd); //关键代码一：设置父窗口
// iren->Start();
renWin->Render(); // 关键代码二：开始绘制，启动交互器
}
