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vtkLightWidget.cxx
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vtkLightWidget.cxx
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/*=========================================================================
Program: Visualization Toolkit
Module: vtkLightWidget.cxx
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
#include "vtkLightWidget.h"
#include "vtkCallbackCommand.h"
#include "vtkCommand.h"
#include "vtkLightRepresentation.h"
#include "vtkObjectFactory.h"
#include "vtkRenderWindow.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkRenderer.h"
#include "vtkWidgetCallbackMapper.h"
#include "vtkWidgetEvent.h"
vtkStandardNewMacro(vtkLightWidget);
//------------------------------------------------------------------------------
vtkLightWidget::vtkLightWidget()
{
// Define widget events
this->CallbackMapper->SetCallbackMethod(
vtkCommand::LeftButtonPressEvent, vtkWidgetEvent::Select, this, vtkLightWidget::SelectAction);
this->CallbackMapper->SetCallbackMethod(vtkCommand::LeftButtonReleaseEvent,
vtkWidgetEvent::EndSelect, this, vtkLightWidget::EndSelectAction);
this->CallbackMapper->SetCallbackMethod(
vtkCommand::MouseMoveEvent, vtkWidgetEvent::Move, this, vtkLightWidget::MoveAction);
this->CallbackMapper->SetCallbackMethod(
vtkCommand::RightButtonPressEvent, vtkWidgetEvent::Scale, this, vtkLightWidget::ScaleAction);
this->CallbackMapper->SetCallbackMethod(vtkCommand::RightButtonReleaseEvent,
vtkWidgetEvent::EndScale, this, vtkLightWidget::EndSelectAction);
}
//------------------------------------------------------------------------------
void vtkLightWidget::SelectAction(vtkAbstractWidget* w)
{
vtkLightWidget* self = vtkLightWidget::SafeDownCast(w);
if (self->WidgetRep->GetInteractionState() == vtkLightRepresentation::Outside)
{
return;
}
// Get the event position
int X = self->Interactor->GetEventPosition()[0];
int Y = self->Interactor->GetEventPosition()[1];
// We are definitely selected
self->WidgetActive = true;
self->GrabFocus(self->EventCallbackCommand);
double eventPosition[2];
eventPosition[0] = static_cast<double>(X);
eventPosition[1] = static_cast<double>(Y);
vtkLightRepresentation::SafeDownCast(self->WidgetRep)->StartWidgetInteraction(eventPosition);
self->InvokeEvent(vtkCommand::StartInteractionEvent, nullptr);
self->StartInteraction();
self->EventCallbackCommand->SetAbortFlag(1);
}
//------------------------------------------------------------------------------
void vtkLightWidget::MoveAction(vtkAbstractWidget* w)
{
vtkLightWidget* self = vtkLightWidget::SafeDownCast(w);
// compute some info we need for all cases
int X = self->Interactor->GetEventPosition()[0];
int Y = self->Interactor->GetEventPosition()[1];
// See whether we're active
if (!self->WidgetActive)
{
self->Interactor->Disable(); // avoid extra renders
int oldState = self->WidgetRep->GetInteractionState();
int state = self->WidgetRep->ComputeInteractionState(X, Y);
int changed;
// Determine if we are near the end points or the line
if (state == vtkLightRepresentation::Outside)
{
changed = self->RequestCursorShape(VTK_CURSOR_DEFAULT);
}
else // must be near something
{
changed = self->RequestCursorShape(VTK_CURSOR_HAND);
}
self->Interactor->Enable(); // avoid extra renders
if (changed || oldState != state)
{
self->Render();
}
}
else // Already Active
{
// moving something
double eventPosition[2];
eventPosition[0] = static_cast<double>(X);
eventPosition[1] = static_cast<double>(Y);
vtkLightRepresentation::SafeDownCast(self->WidgetRep)->WidgetInteraction(eventPosition);
self->InvokeEvent(vtkCommand::InteractionEvent, nullptr);
self->EventCallbackCommand->SetAbortFlag(1);
self->Render();
}
}
//------------------------------------------------------------------------------
void vtkLightWidget::EndSelectAction(vtkAbstractWidget* w)
{
vtkLightWidget* self = vtkLightWidget::SafeDownCast(w);
if (!self->WidgetActive)
{
return;
}
// Return state to not active
self->WidgetActive = false;
self->ReleaseFocus();
self->EventCallbackCommand->SetAbortFlag(1);
self->Superclass::EndInteraction();
self->InvokeEvent(vtkCommand::EndInteractionEvent, nullptr);
self->Render();
}
//------------------------------------------------------------------------------
void vtkLightWidget::ScaleAction(vtkAbstractWidget* w)
{
// We are in a static method, cast to ourself
vtkLightWidget* self = vtkLightWidget::SafeDownCast(w);
// Get the event position
int X = self->Interactor->GetEventPosition()[0];
int Y = self->Interactor->GetEventPosition()[1];
// Okay, make sure that the pick is in the current renderer
if (!self->CurrentRenderer || !self->CurrentRenderer->IsInViewport(X, Y))
{
self->WidgetActive = false;
return;
}
// Begin the widget interaction which has the side effect of setting the
// interaction state.
double eventPosition[2];
eventPosition[0] = static_cast<double>(X);
eventPosition[1] = static_cast<double>(Y);
self->WidgetRep->StartWidgetInteraction(eventPosition);
int interactionState = self->WidgetRep->GetInteractionState();
if (interactionState != vtkLightRepresentation::MovingPositionalFocalPoint)
{
return;
}
// We are definitely scaling the cone angle
self->WidgetActive = true;
self->GrabFocus(self->EventCallbackCommand);
vtkLightRepresentation::SafeDownCast(self->WidgetRep)
->SetInteractionState(vtkLightRepresentation::ScalingConeAngle);
// start the interaction
self->EventCallbackCommand->SetAbortFlag(1);
self->StartInteraction();
self->InvokeEvent(vtkCommand::StartInteractionEvent, nullptr);
self->Render();
}
//------------------------------------------------------------------------------
void vtkLightWidget::CreateDefaultRepresentation()
{
if (!this->WidgetRep)
{
this->WidgetRep = vtkLightRepresentation::New();
}
}
//------------------------------------------------------------------------------
void vtkLightWidget::SetRepresentation(vtkLightRepresentation* r)
{
this->Superclass::SetWidgetRepresentation(r);
}
//------------------------------------------------------------------------------
vtkLightRepresentation* vtkLightWidget::GetLightRepresentation()
{
return vtkLightRepresentation::SafeDownCast(this->WidgetRep);
}
//------------------------------------------------------------------------------
void vtkLightWidget::PrintSelf(ostream& os, vtkIndent indent)
{
os << indent << "WidgetActive: " << this->WidgetActive << endl;
this->Superclass::PrintSelf(os, indent);
}