• Table of contents
• Gamedev basics - libgdx - draw a rectangle
  • Preparation: software and tools
    • Install
    • In idea, download the project from github
  • Running and troubleshooting
    • Run the project
    • If doesn't work
      • Java version is not found
  • Experiments
    • Change one of the values inside rect() function
    • Change rectangle color
    • Change background color

Gamedev basics - libgdx - draw a rectangle¶

This is a simple guide that allows to to draw a single rectangle on the screen.

Drawing rectangle is as simple as

renderer.rect(100f, 100f, 20f, 20f)

Programming games and animations could be started without IT or programming skills. These skills will be developed along the journey.

Here is step-by-step guide, how to start with game programming.

Guide is separated in 3 main sections:

1. Preparation: software and tools.
2. Running and troubleshooting.
3. Experiments.

Preparation: software and tools¶

Install¶

• git
• java 21
• intellij community edition

In idea, download the project from github¶

URL: https://github.com/petrukhnov/libgdx-kotlearn

Agree to import it as gradle project. If it doesn't import, refresh manually:

Running and troubleshooting¶

Run the project¶

It should open new window with green background and white rectangle:

If it is not shown, see steps below to troubleshoot.

If doesn't work¶

Java version is not found¶

Select jdk 21, or download if missing.

manually select it:

Experiments¶

Here are few things to try.

Change one of the values inside rect() function¶

Main:29
shapeRenderer.rect(100f, 200f, 30f, 30f)

Rerun and observe how shape changed.

Change rectangle color¶

E.g. add on line 28 shapeRenderer.color = Color(1f, 0f, 0f, 1f)

Change background color¶