Hello, I am new to processing (but not new to programming and java) and I need help with sketch I am making for my friend. I have simple particle engine, that spawns particles with mouse movement. Thay have pretty simple physics now, but I want to achieve painting splashes. So I need the particles to paint background image as they move.  Here is the sketch with particle movement drawn in the image, but I need to draw it more like a whole splash, not lines. Thank you for your help.