Coding a 2D Game Engine in Java

This is the repository for a YouTube series here. If you want to run the code yourself follow these instructions:

To Run

1. You must have Gradle 6.3+ and Java 1.8+ installed. If you do not have these installed, you should install them and add them to your environment variables.

   • Once you have them installed you should be able to run:

     gradle --version

     and

     java -version

     And get no errors. The output should read similar to the following (it's ok if it doesn't read exactly the same way):

     ------------------------------------------------------------
     Gradle 6.3
     ------------------------------------------------------------
     
     Build time:   2020-03-24 19:52:07 UTC
     Revision:     bacd40b727b0130eeac8855ae3f9fd9a0b207c60
     
     Kotlin:       1.3.70
     Groovy:       2.5.10
     Ant:          Apache Ant(TM) version 1.10.7 compiled on September 1 2019
     JVM:          1.8.0_231 (Oracle Corporation 25.231-b11)
     OS:           Windows 10 10.0 amd64
     
     java version "1.8.0_231"
     Java(TM) SE Runtime Environment (build 1.8.0_231-b11)
     Java HotSpot(TM) 64-Bit Server VM (build 25.231-b11, mixed mode)
     

2. Open a Command Prompt in the projects root directory.
   • If you run ls (Mac, Linux) or dir (Windows) you should see libs, src, and assets listed as part of the output.
3. Run:

   gradle fatJar

   • This will create a fat JAR containing all the dependencies for the project.
4. Run

   java -jar build/libs/mario-1.0-SNAPSHOT-all.jar

   • This should open a new Window with the Mario game running.
   • NOTE: The ImGui Windows will probably be placed in very weird places. This is because I can't export default settings for ImGui, so you'll have to reposition the windows in the dock before it looks correct.