Generate random space invaders. The program works by generating a random block of pixels (4x6 by default), and then mirroring it on the Y axis.

Invaders can be produced as text (on stdout), or as a PNG image (to a file).

java -jar invaders-1.0-standalone.jar [options]

• -help: Display help text.
• -p,--png: Generate output as a PNG. Cannot be specified with text.
• -t,--text: Generate output as text. When this option is specified, a pixel (when specifying other options) will mean a single character. Cannot be specified with png.
• -x <arg>: The number of un-mirrored, un-scaled pixels on the X axis of a tile (default: 4)
• -y <arg>: The number of un-scaled pixels on the Y axis of a tile (default: 6)
• s,--scale: <arg>: The scaling factor for a tile (default: 1). Tiles will be scaled by this number after all pixels have been generated.
• seed <arg>: The random seed for tile generation. Specifying the same random seed will result in the same invaders being generated.

• -b,--border <arg>: The border width for a tile (default: 0). This number of pixels will be left clear around each tile.
• -tileX <arg>: The number of tiles to create along the X axis (default: 1). Cannot be specified with pxWidth.
• -tileY <arg>: The number of tiles to create along the Y axis (default: 1). Cannot be specified with pxHeight.
• -pxHeight <arg>: The height (in pixels) of the final output. The number of tiles will be calculated to give this height. Cannot be specified with tileY.
• -pxWidth <arg> the width (in pixels) of the final output. The number of tiles will be calculated to give this width. Cannot be specified with tileX.

• -guassian <arg>: The guassian blur radius to be used (image only, default: 3). Cannot be specified with text.
• -o,--output <arg>: The output file name (image only, default: invader.png). Cannot be specified with text.

The project uses Gradle. So long as you have a Java 7 or higher installed, you can just run ./gradlew standalone and a standalone jar file will be generated as ./build/libs/invaders-1.0-standalone.jar.