Parzibyte's blog

A few days ago I did an exercise on a sales system in PHP. It is written in pure PHP, no Javascript. Mind you, for the styles I used a Bootstrap variant.

The files don’t have a structure, but like I said, it’s an example. I also write this because it either serves someone else or it serves myself for some references.

For data persistence it uses MySQL. This POS Save products and sales. It does not handle user permissions. We store the shopping cart in the session, and well, I better explain it in parts in this post.

Obviously this POS software is free and open source.

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Today I am going to show you a software that I just made with Laravel. It is a sales system, point of sale, POS or whatever you call it, which is used to keep track of the products that are sold, the sales, and so on.

It is a totally free and open source system; which means that you can use it at no cost, and modify it to your needs or customize it. Among its features we find:

1. It Uses Laravel in its latest version (as of this writing)
2. Bootstrap is used for styles
3. FontAwesome Icons
4. Fully responsive system, that is, it works on mobiles, tablets and computers
5. Inventory control with sale price, purchase price, profit, stock, etc.
6. Option to make sale, adding products
7. Checking inventory stock when selling
8. Subtraction of stock when selling
9. Printing of sales tickets on thermal printer
10. Sales report
11. User login and registration
12. User management
13. Customer registration
14. Ticket that includes the customer’s name

Now let’s see how I have developed it, where you can download it, and so on.

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In this Python programming tutorial you will learn how to create a REST API using Flask, SQLite 3 (for data), and JSON for data communication.

In the end you will have an API that you can consume from any client that could be an Android application, a browser with JavaScript or even another server language.

I will show you how to create an API that communicates using JSON and saves the data in SQLite 3. The API will be created with Flask, and we will use the Python programming language to handle all the data.

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In this post I will show you the Tetris game programmed in pure JavaScript, totally free and open source.

This block game is programmed with JavaScript and uses canvas to paint the game. I also use Bootstrap for the layout of the buttons and the page in general, with a bit of SweetAlert for the alerts.

Although it seems simple to do, it is one of the jobs that has cost me the most and of which I am most proud. It was complex (for me) to understand all the logic for collisions, rotations, row deletion, part movement, limits, etc.

Among the features of the game we find:

• Sounds: background music, sound when the piece cannot be rotated, when a complete row is made and when the tetromino touches the ground
• Colors: each piece has a random color chosen at runtime
• Rotations: pieces can be rotated to accommodate them and accumulate points
• Mobile compatible: because it is web, I have added some buttons to be able to play it on mobile phones and tablets, but it can also be played with the keyboard
• Open source: you can modify the game, the board, the length, speed, pieces, rotations, etc.
• Tetris port: behaves like any normal tetris game
• Game pause: the game can be paused or resumed at any time

Let’s see then the details of this game programmed in JS. Throughout the post I will show you how this game is programmed, I will also leave you a demo and the complete code which is FOSS.

Note: figure, piece and tetromino will be used synonymously in this post.

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