{"id":6128,"date":"2025-07-28T12:42:14","date_gmt":"2025-07-28T10:42:14","guid":{"rendered":"https:\/\/home.et.utwente.nl\/slootenvanf\/?p=6128"},"modified":"2025-07-30T15:23:17","modified_gmt":"2025-07-30T13:23:17","slug":"java-tutorial-create-an-application-that-can-draw-a-simple-shape","status":"publish","type":"post","link":"https:\/\/home.et.utwente.nl\/slootenvanf\/2025\/07\/28\/java-tutorial-create-an-application-that-can-draw-a-simple-shape\/","title":{"rendered":"Java tutorial: create an application that can draw a simple shape"},"content":{"rendered":"\n

This tutorial can also be done in Python: the tutorial for that you can find here<\/a>. This tutorial is part of a series. Make sure to start with the first<\/a>, eg. if you have not setup Eclipse and your Java environment yet.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

We are going to create an application that can draw a simple shape. This shape fills the screen, and might even scale when we resize the application. The color of the shape can be adjusted by entering the RGB values (three numbers) for the color components red, green and blue. These numbers can have values 0-255. Examples of how to draw shapes are given here<\/a>.<\/p>\n\n\n\n

Tutorial steps<\/p>\n\n\n\n

    \n
  1. Design and create the user interface<\/li>\n\n\n\n
  2. Write code for drawing<\/li>\n\n\n\n
  3. Set color<\/li>\n\n\n\n
  4. Read user input<\/li>\n\n\n\n
  5. Drawing with different colors<\/li>\n\n\n\n
  6. Draw the colored shape<\/li>\n\n\n\n
  7. Make entry of numbers fool-proof<\/li>\n<\/ol>\n\n\n\n

    These steps are explained in detail below.<\/p>\n\n\n\n

    1. Design and create the user interface<\/h2>\n\n\n\n

    The user interface consists of two parts:<\/p>\n\n\n\n