Web

VTK

Open File By Browser & Set Mouse Position By VTK

Open File By Browser The FileReader object lets web applications asynchronously read the contents of file. You can feel the effect at: https://www.weiy.city/web-test/open-file/ <!doctype html> <html lang=”en”> <head> <title>Test</title> </head> <body> <input type=”file” id=”file-input” /> <h3>Contents of the file:</h3> <pre id=”file-content”></pre> <script> function displayContents(contents) { var element = document.getElementById(‘file-content’); element.textContent Read more…

By StephenWei, 3 years ago

Render Target Element By MathJax In Time

The math formula can be rendered successfully if the relative code had been written when load HTML page. Example: jsbin.com But it would fail if we change math formula code after loaded page sometimes. So we need to update the target html elements manually. Note: if you can’t access the Read more…

By StephenWei, 3 years3 years ago

Web

Export CPlusPlus Algorithm To Javascript Code

I will show a way to export CPlusPlus algorithm to javascript code. Write Pollard’s rho algorithm in class Resolver for integer factorization. resolver.h #include <string> typedef long long LL; class Resolver { public: Resolver(); ~Resolver(); std::string GetResolvedResult(int x); protected: void find(LL n,LL c); bool Miller_rabin(LL p); LL Pollard_rho(LL n,LL c); Read more…

By StephenWei, 3 years ago

Web

HTML: Render Math Formula By MathJax

We will render math Formula in browser by Js engine MathJax. Download the mathjax package to host it from our own server. git clone https://github.com/mathjax/MathJax.git mj-tmp mv mj-tmp/es5 <path-to-server-location>/mathjax rm -rf mj-tmp Write a JS file which import mathjax to analyze string which contains latex math code. check-for-tex.js: (function () Read more…

By StephenWei, 3 years ago

Web

Call C Function In Javascript Code With WebAssembly

Create a file GetPrimers.c which has a simple math function. #include <stdio.h> // export the function. #ifdef __EMSCRIPTEN__ #include <emscripten.h> EMSCRIPTEN_KEEPALIVE #endif int compute( int a, int b ) { int ans = 1; for( int i = 0; i < b; ++i ) { ans = ans * a; Read more…

By StephenWei, 3 years3 years ago

Web

Make Your WordPress Website Has The Ability To Check Network Connection.

The post introduce a way to make your wordpress website has the ability to check network connection. Install the plugin Insert Headers and Footers for wordpress. Add the following code in header part. <script> if (“serviceWorker” in navigator) { navigator.serviceWorker.register(“/serviceworker.js”) .then(function(registration) { console.log(“Service Worker registered with scope:”, registration.scope); }).catch(function(err) { Read more…

By StephenWei, 3 years ago

Python

Create Service : Make Images From PDF 2

We have to create zip file from output folder. After that users can download the result. Install zipfile module for python. pip install zipfile36 Use it in our python script to generate zip file. import sys, fitz # import the bindings if sys.version_info >= (3, 6): import zipfile else: import Read more…

By StephenWei, 3 years ago

Web

Is WebAssembly Supported On Your Browser?

Somtimes the user’s browser is not the newest version. It may not support WebAssembly or a few functions. So we have to test it before using. Is WebAssembly Supported? Import a WebAssembly module and create an instance of it. Track this process to see if any problems arise. <!doctype html> Read more…

By StephenWei, 3 years ago

Web

Learn WebAssembly – Compile C Code And Show Output

Create a small program by computer language C, it print primers in range (1, 6000). Let’s compile it by emcc and generate a template html file. #include <stdio.h> const int N = 6000; int primer[N],count; char visit[N] = { 0 }; void GetPrimers() { count = 0; for (int i Read more…

By StephenWei, 3 years ago