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feat: add projection toggle button to switch between perspective and orthographic views

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This commit is contained in:
AndreaRigoni
2026-04-02 14:42:38 +00:00
parent 96ab3b0930
commit 6396bdfebf
7 changed files with 159 additions and 4 deletions
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93
src/Vtk/uLibVtkViewer.cpp
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@@ -72,6 +72,7 @@ struct ViewerData {
vtkRenderWindow *m_RenderWindow;
vtkSmartPointer<vtkRenderWindowInteractor> m_Interactor;
vtkSmartPointer<vtkButtonWidget> m_GridButton;
vtkSmartPointer<vtkButtonWidget> m_ProjButton;
ViewerData() : m_RenderWindow(vtkRenderWindow::New()) {}
~ViewerData() {
@@ -97,6 +98,11 @@ Viewer::~Viewer() {
dv->m_GridButton->SetInteractor(nullptr);
dv->m_GridButton = nullptr;
}
if (dv->m_ProjButton) {
dv->m_ProjButton->Off();
dv->m_ProjButton->SetInteractor(nullptr);
dv->m_ProjButton = nullptr;
}
if (this->GetRenderWindow()) {
this->GetRenderWindow()->RemoveAllObservers();
}
@@ -123,6 +129,7 @@ void Viewer::InstallPipe() {
// Setup native grid button
if (!std::getenv("CTEST_PROJECT_NAME")) {
SetupGridButton();
SetupProjButton();
}
// BUT we want to override the style with our custom NoSpin version
@@ -238,9 +245,91 @@ void Viewer::UpdateGridButtonPosition() {
rep->PlaceWidget(bds);
}
void Viewer::Start() {
void Viewer::SetupProjButton() {
if (!dv->m_RenderWindow || !dv->m_RenderWindow->GetInteractor()) return;
vtkNew<vtkImageCanvasSource2D> canvas;
canvas->SetScalarTypeToUnsignedChar();
canvas->SetNumberOfScalarComponents(4);
canvas->SetExtent(0, 63, 0, 63, 0, 0);
// State 0: Perspective (gray trapezoid-like lines)
canvas->SetDrawColor(0, 0, 0, 0);
canvas->FillBox(0, 63, 0, 63);
canvas->SetDrawColor(120, 120, 120, 255);
canvas->DrawSegment(16, 16, 48, 16);
canvas->DrawSegment(48, 16, 56, 48);
canvas->DrawSegment(56, 48, 8, 48);
canvas->DrawSegment(8, 48, 16, 16);
canvas->Update();
vtkNew<vtkImageData> imgPersp;
imgPersp->DeepCopy(canvas->GetOutput());
// State 1: Orthographic (white rectangle)
canvas->SetDrawColor(0, 0, 0, 0);
canvas->FillBox(0, 63, 0, 63);
canvas->SetDrawColor(255, 255, 255, 255);
canvas->DrawSegment(12, 16, 52, 16);
canvas->DrawSegment(52, 16, 52, 48);
canvas->DrawSegment(52, 48, 12, 48);
canvas->DrawSegment(12, 48, 12, 16);
canvas->Update();
vtkNew<vtkImageData> imgOrtho;
imgOrtho->DeepCopy(canvas->GetOutput());
vtkNew<vtkTexturedButtonRepresentation2D> rep;
rep->SetNumberOfStates(2);
rep->SetButtonTexture(0, imgPersp);
rep->SetButtonTexture(1, imgOrtho);
dv->m_ProjButton = vtkSmartPointer<vtkButtonWidget>::New();
dv->m_ProjButton->SetInteractor(dv->m_RenderWindow->GetInteractor());
dv->m_ProjButton->SetRepresentation(rep);
UpdateProjButtonPosition();
vtkNew<vtkCallbackCommand> resizeCallback;
resizeCallback->SetClientData(this);
resizeCallback->SetCallback([](vtkObject*, unsigned long, void* clientdata, void*){
static_cast<Viewer*>(clientdata)->UpdateProjButtonPosition();
});
dv->m_RenderWindow->AddObserver(vtkCommand::ModifiedEvent, resizeCallback);
vtkNew<vtkCallbackCommand> stateCallback;
stateCallback->SetClientData(this);
stateCallback->SetCallback([](vtkObject* caller, unsigned long, void* clientdata, void*){
auto* btn = vtkButtonWidget::SafeDownCast(caller);
auto* v = static_cast<Viewer*>(clientdata);
auto* r = vtkTexturedButtonRepresentation2D::SafeDownCast(btn->GetRepresentation());
v->SetParallelProjection(r->GetState() == 1);
});
dv->m_ProjButton->AddObserver(vtkCommand::StateChangedEvent, stateCallback);
dv->m_ProjButton->On();
rep->SetState(GetParallelProjection() ? 1 : 0);
}
void Viewer::UpdateProjButtonPosition() {
if (!dv->m_ProjButton || !dv->m_RenderWindow) return;
auto* rep = vtkTexturedButtonRepresentation2D::SafeDownCast(dv->m_ProjButton->GetRepresentation());
if (!rep) return;
int *sz = dv->m_RenderWindow->GetSize();
if (sz[0] == 0 || sz[1] == 0) return;
int margin_right = 23;
int margin_top = 220; // below the grid button (170 + 50)
int btnSz = 100;
double bds[6] = { (double)sz[0] - btnSz - margin_right, (double)sz[0] - margin_right,
(double)sz[1] - margin_top - btnSz/2.0, (double)sz[1] - margin_top + btnSz/2.0, 0, 0 };
rep->PlaceWidget(bds);
}
void Viewer::Start() {
if (std::getenv("CTEST_PROJECT_NAME")) return;
dv->m_RenderWindow->GetInteractor()->Start();
dv->m_RenderWindow->GetInteractor()->Start();
}
vtkRenderWindow *Viewer::GetRenderWindow() { return dv->m_RenderWindow; }