/ Calculator

A Flutter Package to render Mathematics and Chemistry Equations based on LaTeX

A Flutter Package to render Mathematics and Chemistry Equations based on LaTeX

Flutter TeX

A Flutter Package to render so many types of equations based on LaTeX, most commonly used are as followings:

  • Mathematics / Maths Equations (Algebra, Calculus, Geometry, Geometry etc...)

  • Physics Equations

  • Signal Processing Equations

  • Chemistry Equations

  • Statistics / Stats Equations

  • It also includes full HTML with JavaScript support.

Rendering of equations depends on mini-mathjax a simplified version of MathJax a JavaScript library.

This package mainly depends on webview_flutter plugin.

Only Tested on Android not on iOS because I don't own a Mac.

Use this package as a library in your flutter Application

1: Add this to your package's pubspec.yaml file:

dependencies:
  flutter_tex: ^0.0.19

2: You can install packages from the command line:

$ flutter packages get

Alternatively, your editor might support flutter packages get. Check the docs for your editor to learn more.

3: Now in your Dart code, you can use:

import 'package:flutter_tex/flutter_tex.dart';

4: Make sure to add this line android:usesCleartextTraffic="true" in your <project-directory>/android/app/src/main/AndroidManifest.xml under application like this.

<application
       android:usesCleartextTraffic="true">
</application>

For iOS add following code in your <project-directory>/ios/Runner/Info.plist


<key>NSAppTransportSecurity</key>
  
  <dict>
    <key>NSAllowsArbitraryLoads</key> <true/>
  </dict>

<key>io.flutter.embedded_views_preview</key> <true/> 

Example

import 'package:flutter/material.dart';
import 'package:flutter_tex/flutter_tex.dart';

main() async {
runApp(FlutterTeX());
}

class FlutterTeX extends StatefulWidget {
@override
_FlutterTeXState createState() => _FlutterTeXState();
}

class _FlutterTeXState extends State<FlutterTeX> {
  String teX = Uri.encodeComponent(r"""
  <p>
    A simple Example to render \( \rm\\TeX \) in flutter<br>

    <style>
      .card {
        box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2);
        transition: 0.3s;
        width: 40%;
      }

      .card:hover {
        box-shadow: 0 8px 16px 0 rgba(0, 0, 0, 0.2);
      }

      .container {
        padding: 2px 16px;


    </style>
    <div class="card">
      <div class="container">
        <p>
          \begin{align}
          \dot{x} & = \sigma(y-x) \\
          \dot{y} & = \rho x - y - xz \\
          \dot{z} & = -\beta z + xy
          \end{align}
        </p>
      </div>
    </div>

    <br>
    <br>

    When \(a \ne 0 \), there are two solutions to \(ax^2 + bx + c = 0\) and they are

    $$x = {-b \pm \sqrt{b^2-4ac} \over 2a}.$$<br>

    $$ \oint_C {E \cdot d\ell = - \frac{d}{{dt}}} \int_S {B_n dA} $$<br>

    Bohr Radius

    \( a_0 = \frac{{\hbar ^2 }}{{m_e ke^2 }} \)<br>

    Relationship between Energy and Principal Quantum Number

    \( E_n = - R_H \left( {\frac{1}{{n^2 }}} \right) = \frac{{ - 2.178 \times 10^{ - 18} }}{{n^2 }}joule \)<br><br>

    $$\ce{CO2 + C -> 2 CO}$$ <br><br>

    $$\ce{Hg^2+ ->[I-] HgI2 ->[I-] [Hg^{II}I4]^2-}$$ <br><br>

    $$\ce{x Na(NH4)HPO4 ->[\Delta] (NaPO3)_x + x NH3 ^ + x H2O}$$ <br><br>

  </p>
  """);

 @override
 Widget build(BuildContext context) {
   return MaterialApp(
     home: Scaffold(
       appBar: AppBar(
         title: Text("Flutter TeX Example"),
       ),
       body: TeXView(
         teXHTML: teX,
       ),
     ),
   );
 }
}

Screenshots

Screenshot_1

Screenshot_2

GitHub