A simple reference for how to draw lines, rectangles, circles, polygons etc.. using the appropriate java libraries and methods included in those libraries.
How to save everything to a file and how to draw multiple lines in the same image.
Draws two crossed lines, or a hexagon, or a filled rectangle with the colours set in both functions.
Simple compilation (no need for dependencies, since everything is standard library):
kotlinc drawLines.kt -include-runtime drawLines.jar
java -jar drawLines.jar