def spawn_letters(bitmap_font, text, start_x, start_y, batch, boundaries):
points = len(text)
if points <= 0:
return []
letters = []
angle = 0
angle_diff = 360 / points
for letter in text:
letter_image = bitmap_font.get_image(letter)
direction = [math.cos(angle), math.sin(angle)]
l = Letter(img=letter_image,
batch=batch,
life_milliseconds=5.0, boundaries=boundaries,
direction=direction)
l.x = start_x
l.y = start_y
letters.append(l)
angle += angle_diff
return letters
