CPlusPlus – Page 7

VTK – How To Show Bounding Box For A 3D Model

It’s a simple job for us to make bounding box visible in traditional VTK render window. We can SetCurrentRenderer for renderWindowInteractor->GetInteractorStyle() and press P to show it. #include <iostream> #include <vtkSmartPointer.h> #include <vtkSphereSource.h> #include <vtkActor.h> #include <vtkConeSource.h> #include <vtkRenderer.h> #include <vtkRenderWindow.h> #include <vtkPolyDataMapper.h> #include <vtkProperty.h> #include <vtkRenderWindowInteractor.h> #include <vtkLight.h> #include Read more…

By StephenWei, 6 years2019-07-20 ago

Algorithm

CPP – Driven Class Of unary_function

Driven class of unary_function can be used to check a single element based on special condition.Programmer can regard it as some algorithms’ parameter, such as count_if, find_if, and find_if_not.The following code shows how to write a customized unray class and use it. C++ struct Widget { int GetSpeed() const { return speed; } Widget( const Read more…

By theArcticOcean, 6 years2019-06-12 ago

Algorithm

CPP – Partial Sort Algorithm

We need not sort all elements sometimes. Here are a few simple examples of STL algorithms partial_sort, nth_element, and partition. partial_sort For example, find the 5 biggest ones in 10 random numbers. #include <iostream> #include <vector> #include <cstdlib> #include <ctime> #include <algorithm> using namespace std; int main() { vector<int> values; Read more…

By theArcticOcean, 6 years2019-06-12 ago

CPlusPlus

CPP – Write Compare Class For Container

We need a flexible compare way for our objects in some situations, so it’s necessary to write our own compare class. The article has an example which puts all widgets in a multiset container, the widgets should be sort by its data member Speed. The widgets are created with random Read more…

By theArcticOcean, 6 years2019-06-11 ago

CPlusPlus

VTK – Reverse PolyData’s Normals

vtkReverseSense can help us to reverse the direction of point normals and cell normals. The following code shows a simple example which display vertexes’ normals by cones in a sphere. Here is its original geometric states. #include <iostream> #include <vtkSmartPointer.h> #include <vtkSphereSource.h> #include <vtkActor.h> #include <vtkConeSource.h> #include <vtkRenderer.h> #include <vtkRenderWindow.h> Read more…

By theArcticOcean, 6 years2019-06-10 ago

CPlusPlus

QT – Common Setting For Window

Borderless window: setWindowFlags( Qt::FramelessWindowHint ); Set background color: QPalette pal = mainWin->Getui().qvtkWidget->palette(); pal.setColor( QPalette::Background, Qt::black ); setAutoFillBackground( true ); this->setPalette( pal ); Make window stay on the top level: setWindowFlags(Qt::WindowStaysOnTopHint) Remove maximize button in widget： setWindowFlags( this->windowFlags() & ~Qt::WindowMaximizeButtonHint ); Definite buttons on title bar: setWindowFlags( Qt::CustomizeWindowHint | Qt::WindowMaximizeButtonHint); //Only Read more…

By theArcticOcean, 6 years2019-06-06 ago

CPlusPlus

QT – QTest event, QSignalSpy and installEventFilter

The interfaces can imitate users’ operations. QTest::keyClick QTest::keyPress QTest::mouseClick QSignalSpy listens for signal emission, it is a list of QVariant lists. It will not shield off signal to make slot invalid. QCheckBox *box = …; QSignalSpy spy(box, SIGNAL(clicked(bool))); //… QList arguments = spy.takeFirst(); // take the first signal QVERIFY(arguments.at(0).toBool() == Read more…

By theArcticOcean, 6 years2019-06-02 ago

CPlusPlus

Package For My VTK Program FourSidesCone

Development environment: VTK-8.1.1 macOS 10.14.4 Qt 5.11.2 Clang 8.1.0 package for vtk program use otool command tool to find all depent library files for executable. otool -L exe Then we can redirect all output logs into a local file and make it as a shell script file. Rewrite it and Read more…

By theArcticOcean, 6 years2019-05-30 ago

CPlusPlus

VTK – Update Different Views When Selections Changed

The article shows how to use vtkViewUpdater to update different views when the selections changed. Relevant development environment: VTK-8.1.1; Qt 5.11.2 (x86_64-little_endian-lp64 shared (dynamic) release build; Clang 8.1.0 (clang-802.0.42) (Apple)) on “cocoa”; macOS 10.14 [darwin version 18.5.0]; #include <QApplication> #include <qsurfaceformat.h> #include <QVTKOpenGLWidget.h> #include <vtkRandomGraphSource.h> #include <vtkDataObjectToTable.h> #include <vtkQtTableView.h> #include Read more…

By theArcticOcean, 6 years2019-05-27 ago