# lines: make lots of lines on the screen
# pep8-ignore: E501

import pippy
import pygame
import sys
from pygame.locals import *
from random import *

# always need to init first thing
pygame.init()

# turn off the cursor
pygame.mouse.set_visible(False)

# create the window and keep track of the surface
# for drawing into
screen = pygame.display.set_mode((0, 0), pygame.FULLSCREEN)

# ask for screen's width and height
size = width, height = screen.get_size()

# start the screen all black
screen.fill((0, 0, 0))

# we need starting endpoints for the line and seed motion vectors
start = [randint(0, size[0]), randint(0, size[1])]
end = [randint(0, size[0]), randint(0, size[1])]

# randomize the motion, 1..3 in each direction, positive or negative, but
# never 0
mvect_start = [choice((-1, 1)) * randint(1, 3), choice((-1, 1)) * randint(1, 3)]
mvect_end = [choice((-1, 1)) * randint(1, 3), choice((-1, 1)) * randint(1, 3)]

# start with a random color and color direction
color = [randint(0, 255), randint(0, 255), randint(0, 255)]
direction = [choice((-1, 1)), choice((-1, 1)), choice((-1, 1))]

while pippy.pygame.next_frame():

    for event in pygame.event.get():
        if event.type == QUIT:
            sys.exit()

        elif event.type == KEYDOWN:
            sys.exit()

    # draw the line using the current values and width=3
    pygame.draw.line(screen, color, start, end, 3)

    # update the display
    pygame.display.flip()

    # update the end points and the color
    for i in range(2):
        start[i] = start[i] + mvect_start[i]
        end[i] = end[i] + mvect_end[i]

    for i in range(3):
        color[i] = color[i] + direction[i]

    # check if anything has gone out of range and
    # if so, bring back to edge and reverse the
    # corresponding motion vector
    if start[0] < 0:
        start[0] = 0
        mvect_start[0] = (-1) * mvect_start[0]
    elif start[0] >= size[0]:
        start[0] = size[0] - 1
        mvect_start[0] = (-1) * mvect_start[0]

    if start[1] < 0:
        start[1] = 0
        mvect_start[1] = (-1) * mvect_start[1]
    elif start[1] >= size[1]:
        start[1] = size[1] - 1
        mvect_start[1] = (-1) * mvect_start[1]

    if end[0] < 0:
        end[0] = 0
        mvect_end[0] = (-1) * mvect_end[0]
    elif end[0] >= size[0]:
        end[0] = size[0] - 1
        mvect_end[0] = (-1) * mvect_end[0]

    if end[1] < 0:
        end[1] = 0
        mvect_end[1] = (-1) * mvect_end[1]
    elif end[1] >= size[1]:
        end[1] = size[1] - 1
        mvect_end[1] = (-1) * mvect_end[1]

    for i in range(3):
        if color[i] < 0:
            color[i] = 0
            direction[i] = direction[i] * (-1)
        elif color[i] >= 255:
            color[i] = 255
            direction[i] = direction[i] * (-1)

    # randomly change the color directon on occasion
    if randint(0, 511) == 128:
        for i in range(3):
            direction[i] = choice((-1, 1))