2 Guided Tour

2.1 Introduction

This online tutorial is based on a fictitious assignment, which will be described below.  The tutorial will demonstrate the Mjolner tool, by showing how to build an application that solves this assignment.
The application is structured into three parts.

    MyShop         The classes that define the objects in the model

    MyGUI            The graphical user interface.

    MyProgram   The main application which ties the model with the graphical user interface.

To get an impression of the code structure of the application you can look at the files MyShop.bet, MyGUI.bet and MyProgram.bet respectively.

2.2 The Assignment

Picture you got an assignment from a bookstore, to engineer a system, which customers can use online in the store, to browse through books and CDs. The customer can then choose from the commodities, and put them into a virtual shopping cart. When the customer decides to buy, the system will then send a message to the clerk. The clerk then finds the selected products.
One solution to this assignment, is to make two separate windows (shown below), one window for administration of the system, in other words adding new books and CDs, and one window which is the interface to the customer. To make it simple a perfect world is pictured, in which people never make mistakes while inserting a new product into the system.

The first screen is the administration part of the program, where new products can be inserted. On the left is the list of products already in the system, the right is for inserting new products, and finally the start button is for starting the customer interface of the program.

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The next window is the sales window, where the customer can browse through the products, and enter them into the virtual shopping cart, which ends up with a print out at the clerk's desk. The clerk then finds the products, and make them ready for the customer.
Again the left box is a list of the products from which the customer can choose. If a product is selected from the list, the box named 'Details' will give the customer the details. In the bottom right is where the shopping cart is presented, with a list of items currently in the cart, the total price, and a button 'Buy Items' which sends the printout to the clerk.

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Mjolner Integrated Development Tool - Tutorial
 © 1991-2002 Mjølner Informatics
[Modified: Friday September 21st 2001 at 13:34]