From 6c4b5754a07dff46f0fa5114c863faa1bff95f0f Mon Sep 17 00:00:00 2001
From: Krad <kradchen123@163.com>
Date: Wed, 16 Nov 2022 11:33:31 +0800
Subject: [PATCH] Simple measure drag for volume rendering.

---
 src/src/Interaction/VolumeInteractorStyle.cpp | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/src/src/Interaction/VolumeInteractorStyle.cpp b/src/src/Interaction/VolumeInteractorStyle.cpp
index 8a745e1..edd44a7 100644
--- a/src/src/Interaction/VolumeInteractorStyle.cpp
+++ b/src/src/Interaction/VolumeInteractorStyle.cpp
@@ -45,8 +45,10 @@ void VolumeInteractorStyle::OnLeftButtonDown() {
     this->GrabFocus(this->EventCallbackCommand);
     // un select last selected prop
     if (CurrentProp) {
-        CurrentProp->InvokeEvent(DraggableActor::DraggableActorEvents::UnSelectedEvent);
-        CurrentProp = nullptr;
+        DragStartOrigin[0] = x;
+        DragStartOrigin[1] = y;
+        this->StartDrag();
+        return;
     }
     if (measure) {
         measure->SetPlacing(measure->onMeasureLeftButtonDown(this->Interactor));
@@ -157,6 +159,10 @@ void VolumeInteractorStyle::OnMouseMove() {
             this->WindowLevel();
             this->InvokeEvent(vtkCommand::InteractionEvent, nullptr);
             break;
+        case VTKIS_DRAG:
+            Drag();
+            this->InvokeEvent(vtkCommand::InteractionEvent, nullptr);
+            break;
         case VTKIS_MEASURE:
             MeasurePlace();
 //            this->InvokeEvent(vtkCommand::InteractionEvent, nullptr);
@@ -321,7 +327,7 @@ void VolumeInteractorStyle::GetCurrentVolumeProperty() {
 void VolumeInteractorStyle::Drag() {
     int *pos = this->Interactor->GetEventPosition();
     this->FindPokedRenderer(pos[0], pos[1]);
-    DraggableActor::SafeDownCast(dragProp)->Transform(pos[0] - DragStartOrigin[0], pos[1] - DragStartOrigin[1]);
+    DraggableActor::SafeDownCast(CurrentProp)->Transform(pos[0] - DragStartOrigin[0], pos[1] - DragStartOrigin[1]);
     this->Interactor->Render();
 }