Timed removal of drawn objects using jit.lcd

The simplest way to remove objects after a set duration using jit.lcd – because jit.lcd doesn’t support sprites – is to keep track of the individual drawing components and then redraw the whole stage. The example does so by storing the paintoval messages in a coll then sending the output of the coll to the jit.lcd. Each line of the coll is given an index using the counter and prepend objects. The pipe delays the value from the counter by 10 seconds and then clears the jit.lcd, removes the line with the index specified by the counter, and then dumps the contents of the coll back into the jit.lcd.