JGalaxian

JGalaxian is a Java-based Galaxian clone (you do remember Galaxian, right?). Although it's a pretty fun game in its own right, the code also serves as a decent tutorial on one way of building 2D games in general and in Java in particular. Some features of the design:

Scalable
2D sprites
Sprite lists
Collision detection
Game state machine

Standard stuff, really, but if you're new to 2D game design, maybe you'll find something useful to copy to use in your own games.

Install and usage

With apt, first download the package deb package, and then sudo apt install ./jgalaxian_18.04_1.0.0_amd64.deb.

Or by snap:

sudo snap install jgalaxian.

To adjust the scaling either:

Run it from the command line jgalaxian 3.0, or
cp /usr/share/applications/jgalaxian.desktop ~/.local/share/applications/. and adjust the scaling in the Exec command.
Snap: cp /var/lib/snapd/desktop/applications/jgalaxian_jgalaxian.desktop ~/.local/share/applications/. and adjust the scaling in the Exec command.

Compiling JGalaxian

Java

I use OpenJDK 8, so I know for sure it will work with that. To install it in Ubuntu:

sudo apt install openjdk-8-jdk

You can also use Oracle Java 8:

sudo apt-get install python-software-properties
sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java8-installer

Apache Maven

First, install Apache Maven. To install it in Ubuntu:

sudo apt install maven

Compiling

mvn package

Running it

./jg

Scaling game screen

If you're running JGalaxian on a HiDPI screen, you likely now have a headache from squinting at the tiny screen. JGalaxian supports scaling. To start it using something other than the default scale (1.5), do this:

./jg 2.0

albertzb/jgalaxian