使用 Pygame 生成大量小球

        """
title: 使用 Pygame 生成大量小球
description: 使用 Python 的 Pygame 模块，写的一个测试小程序
tags: 
- Pygame Python
"""
import random
import time
from sys import exit

import pygame
from pygame.locals import QUIT, KEYDOWN, K_UP, K_DOWN, K_LEFT, K_RIGHT

random.seed(int(time.strftime('%H%M%S', time.localtime(time.time()))))


def get_random_integer(min_value=0, max_value=255):
    return random.randint(min_value, max_value)


def random_color(start_r=0, start_g=0, start_b=0, end_r=255, end_g=255, end_b=255):
    """
    generate random rgb value
    :param start_r: minimum value for red, default is 0
    :param start_g: minimum value for green, default is 0
    :param start_b: minimum value for blue, default is 0
    :param end_r: maximum value for red, default is 255
    :param end_g: maximum value for green, default is 255
    :param end_b: maximum value for blue, default is 255
    :return: a tuple(r,g,b)
    """
    r = max(min(random.randint(start_r, end_r), 255), 0)
    g = max(min(random.randint(start_g, end_g), 255), 0)
    b = max(min(random.randint(start_b, end_b), 255), 0)
    logs_print("r, g, b: {0}, {1}, {2}".format(r, g, b))
    return r, g, b


def logs_print(text, level=0):
    """
    print logsw
    :param text: log text
    :param level: levels 0, 1, and 2 correspond to normal logs, warnings, and errors;default level is normal logs
    :return: none
    """
    level = max(min(level, 2), 0)
    level_tuple = ("Logs", "Warning", "Error")
    print("{time} [{level}]: {text}".format(level=level_tuple[level], text=text,
                                            time=time.strftime('%H:%M:%S', time.localtime(time.time()))))


def refresh_screen(screen, fps=60., clear=True, background=(0, 0, 0)):
    """
    refresh screen
    :param screen: which screen to refresh
    :param fps: frame per second
    :param clear: whether clear old content; Notice: this will clear all old content
    :param background: backound color;(r, g, b)
    :return: none
    """
    if clear:
        pygame.display.update()
    fps = max(0.001, fps)
    time.sleep(1 / fps)
    screen.fill(background, )


def init_program(caption="Pygame", the_screen_size=(640, 480), icon=None):
    pygame.init()
    pygame.display.set_caption(caption)
    if icon is not None:
        icon = pygame.image.load(icon)
        pygame.display.set_icon(icon)
    return pygame.display.set_mode(the_screen_size, 0, 32), the_screen_size


class Circle:
    """ draw a solid circle, automatic detect border and automatic reverse
    """

    def __init__(self, surface, border, position, width=5, color=random_color(), speed=[5, 5],
                 disappear_after_collision=False,
                 rebound=True):
        """
        constructor function
        :param surface: assign surface to draw
        :param border: take a list (x, y); x and y correspond to the surface' x and y border
        :param position: position
        :param width: line width, when it is a circle it equals to radius
        :param color: (r, g, b); default value is random
        :param speed: take a list (x, y); it moves x unit length int the x direction and so is param y;can be minus
        :param disappear_after_collision: whether the circle disappear after collision with border
        :param rebound: whether the circle rebound after collision with border
        """
        self.surface = surface
        self.border = border
        self.x = position[0]
        self.y = position[1]
        self.width = width
        self.radius = [self.width, self.width]
        self.color = color
        self.speed = speed
        self.speed_value = list(map(abs, speed))
        self.throwaway = disappear_after_collision
        self.rebound = rebound
        self.movable = True
        logs_print("generating obj...")

    def move(self):
        if self.movable:
            x_direction, y_direction = self.can_continue()
            if x_direction:
                self.x += self.speed[0]
            else:
                if self.rebound:
                    self.speed[0] = -self.speed[0]
                if self.throwaway:
                    self.movable = False
            if y_direction:
                self.y += self.speed[1]
            else:
                if self.rebound:
                    self.speed[1] = -self.speed[1]
                    logs_print("rebound occurs...")
                if self.throwaway:
                    self.movable = False

            self.blit()
        else:
            logs_print("try to move but unmovable now", 1)
        # logs_print("current position: {0},{1}".format(self.x, self.y))

    def set_speed(self, key):
        if key == K_UP:
            self.speed = [0, -self.speed_value[1]]
        elif key == K_DOWN:
            self.speed = [0, self.speed_value[1]]
        elif key == K_LEFT:
            self.speed = [-self.speed_value[0], 0]
        elif key == K_RIGHT:
            self.speed = [self.speed_value[0], 0]

    def blit(self):
        pygame.draw.circle(self.surface, self.color, (self.x, self.y), self.width)

    def can_continue(self):
        if self.x + self.speed[0] + self.radius[0] > self.border[0] or self.x + self.speed[0] - self.radius[0] < 0:
            x_direction = False
        else:
            x_direction = True
        if self.y + self.speed[1] + self.radius[1] > self.border[1] or self.y + self.speed[1] - self.radius[1] < 0:
            y_direction = False
        else:
            y_direction = True
        # logs_print("can continue: {0}, {1}".format(x_direction, y_direction))
        return x_direction, y_direction


screen, screen_size = init_program("Balls", (1800, 1000))

# ball_1 = Circle(screen, screen_size, (100, 150), width=5, speed=[1, 3])
# ball_2 = Circle(screen, screen_size, (400, 350), width=10, speed=[3, 1])
# ball_3 = Circle(screen, screen_size, (200, 450), width=15, speed=[3, 3])

ball_0 = Circle(screen, screen_size, (320, 240), width=10, color=(233, 159, 231), speed=[12, 12])
ball_list = []
for i in range(10000):
    locals()['ball' + str(i)] = Circle(screen, screen_size, (get_random_integer(50, 600), get_random_integer(30, 450)),
                                       width=7, speed=[get_random_integer(3, 10), get_random_integer(3, 10)],
                                       color=[get_random_integer(), get_random_integer(), get_random_integer()])
    ball_list.append(locals()['ball' + str(i)])

while True:
    refresh_screen(screen)
    for event in pygame.event.get():
        if event.type == QUIT:
            exit()
        if event.type == KEYDOWN:
            ball_0.set_speed(event.key)

    # ball_1.move()
    # ball_2.move()
    # ball_3.move()
    ball_0.move()
    for ball in ball_list:
        ball.move()
    

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