A JSON file stores data objects in JavaScript Object Notation(JSON) format. It’s lightweight and readable, the developer uses it to transmit simple data. The article shows how to create and read the JSON file in the Qt environment. I planed to save two books’ information to a simple JSON file Read more…
The interface vtkObjectBase::UnRegister will reduce the reference count for pointer and delete the pointer if the reference count becomes zero. vtkObjectBase::Delete <= vtkObjectBase::UnRegister <= vtkObjectBase::UnRegisterInternal <= delete ptr vtkSmartPointerBase::~vtkSmartPointerBase { vtkObjectBase* object = this->Object; if(object) { this->Object = nullptr; object->UnRegister(nullptr); } } We can get the reference count and consumer Read more…
There are three adjustment stages of the cone in our test. : rotate the cone and make it bigger. : translate the cone after : translate the cone from the original position. Original Scene Create an initial scene like the following image. The red Read more…
The article shows how to move a model on the surface of the other big one.I planed to move the cube on the surface of a big superquadric in the mouse left press moving event. Let’s build an original scene. Created a superquadric source object in ParaView and saved it Read more…
Downloaded the announcement of a listed company from cninfo.com.cn and saved it as a PDF file. The relevant title about it is 国泰君安 – 关于独立董事公开征集投票权的公告. Let’s extract text and table on the PDF file by python. We have to make sure the library pdfplumber had been installed. Use the command Read more…
I want to save a little data into a local file that we read it. It is best done conveniently through C Plus Plus. The following example shows the entire logic. #include <iostream> #include <vector> #include <fstream> using namespace std; std::string filePath = “txt”; void WriteData() { double origin[3] = Read more…
sort The QMap object sorts the elements in it by key rather than the order of insert operation. Let’s see the following example. #include <iostream> #include <QMap> #include <QString> using namespace std; int main() { QMap<QString, int> vars; vars.insert( “ABD”, 1 ); vars.insert( “ABE”, 2 ); QMapIterator<QString, int> it( vars Read more…
squash commits original scene git rebase -i a60635 combine last three commits by squash final scene squash commits by git.xmind
I found vtkSTLWriter can help us to avoid error Can’t follow edge in vtkSelectPolyData as described in the article Is there a bug in vtkSelectPolyData?. The data after I/O operations in STL file format, it can be handled correctly by vtkSelectPolyData. After tried vtkXMLPolyDataWriter, I find that the new data Read more…