Arrays talking to Arrays

My piece is called ‘Fire and Rain’ due to the color of the particles and the properties of their motion.

Rules:

• If particles are fall from top, stroke = blue. If particles rise from bottom, stroke = orange.
• If particles fall within height/4 radius of center, rotate clockwise/ gravitate towards center.
• If mouse is pressed and particles fall within height/2 radius, rotate counterclockwise/ gravitate towards center.
• If particles reach top of canvas, bottom of canvas, or center of canvas, splice out particle.
• use canvas width to determine how many particles spawn per frame. (with a 1920 px width, the system has a maximum of 1600+ particles.)
• strokeWeight is determined by location on canvas in several ways.

Images:

particle system without mouse pressed.

mouse pressed for sort time.

mouse pressed, released, then pressed again.