# the visibility of the cursor in vtkResliceImageViewer

**URL:** https://discourse.vtk.org/t/the-visibility-of-the-cursor-in-vtkresliceimageviewer/4388
**Category:** Support
**Created:** [October 9, 2020, 2:53pm UTC](https://discourse.vtk.org/t/the-visibility-of-the-cursor-in-vtkresliceimageviewer/4388 "2020-10-09T14:53:14Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![yuhuimoon](https://discourse.vtk.org/letter_avatar_proxy/v4/letter/y/c6cbf5/32.png) [@yuhuimoon](https://discourse.vtk.org/u/yuhuimoon)
#### Post date: [October 9, 2020, 2:53pm UTC](https://discourse.vtk.org/t/the-visibility-of-the-cursor-in-vtkresliceimageviewer/4388/1 "2020-10-09T14:53:14Z")

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I use my custom class (SliceViewRender) derived from **vtkResliceImageViewer** to show vtkImageData slice. I have called SetResliceModeToOblique and the crosshair can display exactly. I want to change the visibility of the crosshair cursor with the following code:

```
void SliceViewRender::slotSetCursorVisible(bool visible)
{
// vtkResliceCursorLineRepresentation* cursorLineRep = vtkResliceCursorLineRepresentation::SafeDownCast(GetResliceCursorWidget()->GetRepresentation());
    vtkResliceCursorLineRepresentation* cursorLineRep = dynamic_cast<vtkResliceCursorLineRepresentation*>(GetResliceCursorWidget()->GetRepresentation());

// this->GetResliceCursorWidget()->GetResliceCursorRepresentation()->SetVisibility(visible);
// this->GetResliceCursorWidget()->GetResliceCursorRepresentation()->Modified();

    cursorLineRep->GetResliceCursorActor()->SetVisibility(visible);
    cursorLineRep->GetResliceCursorActor()->Modified();
    GetRenderWindow()->Render();

}

```

I failed to hidden the cursor. If I use GetVisibility(), I can get the correct result(false). But the cursor is always visible. Is there anything wrong with my code?  
My VTK version is 8.2.0. Thanks in advance.

![vtk_image_view](https://discourse.vtk.org/uploads/default/original/2X/f/fab96875cb11a2d5ae8ef3e1661c4fa60fa84915.jpeg)

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<div class="post-metadata">

### Author: ![Jens\_Munk\_Hansen](https://discourse.vtk.org/user_avatar/discourse.vtk.org/jens_munk_hansen/32/1215_2.png) [@Jens\_Munk\_Hansen](https://discourse.vtk.org/u/Jens_Munk_Hansen)
#### Post date: [February 13, 2021, 3:13pm UTC](https://discourse.vtk.org/t/the-visibility-of-the-cursor-in-vtkresliceimageviewer/4388/2 "2021-02-13T15:13:19Z")

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You can change the property of the centerlines of the the cursor actor.

```
for (int i = 0 ; i < 3 ; i++) {
  auto prop = this->GetResliceCursorWidget()->GetResliceCursorRepresentation()->GetResliceCursorActor()->GetCenterlineProperty(i);
  prop->SetOpacity(0.0);
}

```

This solution worked for me

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<div class="post-metadata">

### Author: ![yuhuimoon](https://discourse.vtk.org/letter_avatar_proxy/v4/letter/y/c6cbf5/32.png) [@yuhuimoon](https://discourse.vtk.org/u/yuhuimoon)
#### Post date: [February 14, 2021, 2:35am UTC](https://discourse.vtk.org/t/the-visibility-of-the-cursor-in-vtkresliceimageviewer/4388/3 "2021-02-14T02:35:35Z")

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It’s a good idea. Thank you 😀