This is an extension to my Basic_Rotating_Line. Using my first sketch I added movement on the x axis and y axis and allowed multiple lines to be displayed.
'q' saves the screen image and then quits.
's' saves the screen image.
'c' clears the screen image.
x and y start positions for the lines are randomized.
Line colour is selected from the initial x position of the line using map().
Line alpha starts with a random value.
Line angle starts with a random value.