# splitEllipse3.py
from Processing import *
window(500, 500)

def drawEllipse(o, e):
    x, y = mouseX(), mouseY()
    w, h = width(), height()

    if x > 0.5*w and y > 0.5*h:
        fill(255, 0, 0)     # Red: on lower right
    elif x > 0.5*w and y <= 0.5*h:
        fill(0, 0, 255)     # Blue: lower left
    elif x <= 0.5*w and y > 0.5*h:
        fill(255, 255, 0)   # Yellow: upper right
    else:
        fill(0, 255, 0)     # Green upper left
    ellipse(x, y, 30, 30)

onMousePressed += drawEllipse