Create a sphere and clip it as the following image. We will pull down the boundary and close the opening to get a new model. How to pull down the boundary of the hemispheres? Step 1. Find all independent edges Read more…
The Extensible Markup Language(XML) can be read by humans and machines, it requires all markups must be paired and case sensitive. The article shows how to write and read the XML file in the Qt environment. Write Data To The Read more…
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 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); 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 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. 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 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; 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”, Read more…