def random_cell_list(xlow, ylow, xhigh, yhigh, ncells, area_limit=False, ldiv=7, hdiv=14):
w1 = (xhigh-xlow)/hdiv
w2 = (xhigh-xlow)/ldiv
h1 = (yhigh-ylow)/hdiv
h2 = (yhigh-ylow)/ldiv
chip_area = (xhigh - xlow) * (yhigh - ylow)
total_area = 0
units = list()
for i in range(1, ncells+1):
name = 'u' + str(i)
w = random.randint(w1,w2)
x = random.randint(xlow, xhigh-w)
h = random.randint(h1,h2)
y = random.randint(ylow, yhigh-h)
unit = Unit(name, x, y, x+w, y+h)
if area_limit and total_area + unit.area() > chip_area:
break
total_area += unit.area()
units.append(unit)
print("Chip area =", chip_area)
print("Total units area =", total_area)
return units
