STL Algorithm std::lexicographical_compare is an algorithm which can be used to compare string lexicographically.We can give our comparing function to make it work without pay attention to capital and small letter. C++ template constexpr bool lexicographical_compare( InputIt1 first1, InputIt1 last1, InputIt2 first2, InputIt2 last2, Compare comp ); Example: C++ #include Read more…
std::unique_copy is an algorithm which can be used to copy elements without duplicating objects in adjacent locations. template< class InputIt, class OutputIt > OutputIt uniquecopy( InputIt first, InputIt last, OutputIt dfirst ); Usage example: C++ #include #include #include #include int main() { std::string s1 = “This is a story about Read more…
I write a article about how to create a local coordinate system for a dependent 3d model, LOCAL COORDINATE SYSTEM We can real value in world coordinate system of vector or point on 3D model. For example, I want to know unit vector on model’s X axis or point’s coordinate Read more…
We want to know the world coordinate of a point on a 3D widget event though we don’t know the widget’s position on the world coordinate system. I get a matrix from an actor and create a temporal vtkTransform object, then the function TransformDoublePoint can give me the real coordinate Read more…
vtkRandomGraphSource can be used to create a random graph which includes points and edges. vtkGraphLayoutView is a vtkRenderView which has its own renderer and iterator, we can use it to display graph view. from vtk import * # create a random graph source = vtkRandomGraphSource() source.SetNumberOfVertices(100) source.SetNumberOfEdges(110) source.StartWithTreeOn() #create a Read more…
I often use the function AddInputData or AddInputConnection of vtkAppendPolydata that inherits vtkDataObjectAlgorithm to add multiple polydatas form a big one. That’s a very easy way to combine a few of different polydatas to only one. But I found that it can give me a strange result if I use Read more…
The introduction of Just-in-Time (JIT) debugger tool drmingw： https://vroby.ddns.net/Public/sdlBasic/MinGW/doc/drmingw/drmingw.html It’s very easy to install this tool. We can download from the internet and unzip it: It’s necessary to put the directory of the tool bin in the environment variable Path on windows OS. After that, we can run drmingw.exe by Read more…
Environment: macOS Mojave 10.14 Qt Creator 4.41 Qt 5.9.2 Clang 7.0 apple, 64 bits VTK 8.1.1 Our project shows: Add 3D model in VTK widget means we need to intergrate VTK and Qt development environment. Here are a few notes about it. I put a cone in QVTKOpenGLWidget, and there Read more…
We can use qmake to configure a project for different platforms after reading qt document, Qt 5 > qmake manual > Getting Started. The qmake syntax: macx{ message(“compile for mac os x”) ICON = Images/logo.icns } win32{ message(“compile for windows”) RC_ICONS = Images/logo.ico } Similarly, we can read the target Read more…