The article shows a few simple examples which use python to edit PDF. Copy And Encrypt PDF Just copy an existing PDF and generate a new file which is encrypted import PyPDF2 fileName = “/Users/weiyang/Desktop/Test.pdf” newFileName = “/Users/weiyang/Desktop/NewTest.pdf” file = open( fileName, ‘rb’ ) reader = PyPDF2.PdfFileReader( file ) writer Read more…
Development environment: VTK-8.1.1 To observe all details during rotating the cone, I put a axes actor and another same size cone on the same initial position. So it looks that there is only one cone but that’s not the truth. The two cones are located in the center [0, 0, Read more…
I want to put a spline widget on a plane and move the control points to show scalar on different position dynamically. It will be convenient for user to check the change of scalar on the model. It’s easy to use vtkStructuredGrid and vtkGeometryFilter to create a plane with color Read more…
A few macros we need in our project are in the following code snippet. They can make our project cleaner. #define vtkPtr( var, className ) vtkSmartPointer<className> var = \ vtkSmartPointer<className>::New() #define CPP_SET_MACRO(name,type) \ void Set##name(type _arg) \ { \ if (this->name != _arg) \ { \ this->name = _arg; \ Read more…
Let’s read the history of user’s commitment by $ git log firstly. @{ } We can find details information about these commits by order with syntax @{ }. $ git show HEAD@{0} $ git show HEAD@{1} $ git show HEAD@{2} $ git show HEAD@{3} The syntax @{ } can also Read more…
Emperor Yao is a son of emperor Ku, the oldest son of Ku is Zhi, so Zhi became the new emperor after Ku died. But the new emperor is not good at handling political stuff, on the other hand, Yao always chose talented officials and deal with natural disasters in Read more…
I wrote some simple examples about handling excel with python in article Read Excel Table With Python. Now let’s deal with a more complex task, to combine two different tables based on a common column. Sheet0 Sheet1 Above two tables have the common column, 编号，the number of rows in sheet0 Read more…
VTK provides some convenient algorithms to help us display the whole digital elevation model (DEM). My university major is Geometry Information Science, it’s so exciting for me to write an article about DEM since I became a professional software develop programmer. In the following section, I will show how to Read more…
Develop environment: VTK-8.2.0 Qt Creator 4.9.0 Based on Qt 5.12.2 (MSVC 2017, 32 bit) CMake 3.14.3 CMake Generator: Visual Studio 16 2019 Configure compilers for my building kit C compiler： C:/Program Files (x86)/Microsoft Visual Studio/2019/Community/VC/Tools/MSVC/14.21.27702/bin/Hostx64/x64/cl.exe CXX compiler： C:/Program Files (x86)/Microsoft Visual Studio/2019/Community/VC/Tools/MSVC/14.21.27702/bin/Hostx64/x64/cl.exe More details are in the following image. We Read more…