{"id":8744,"date":"2021-02-28T12:07:57","date_gmt":"2021-02-28T11:07:57","guid":{"rendered":"https:\/\/pythonprogramming.altervista.org\/?p=8744"},"modified":"2021-02-28T12:09:04","modified_gmt":"2021-02-28T11:09:04","slug":"pygame-snow-particles-part-2","status":"publish","type":"post","link":"https:\/\/pythonprogramming.altervista.org\/pygame-snow-particles-part-2\/","title":{"rendered":"Pygame snow particles part 2"},"content":{"rendered":"\n

I made some changes to the particle script I showed some days ago (here<\/a>). The result is a little more complicated and maybe nicer, but it’s made just to deepen a little bit our knowledge of particles with pygame.<\/p>\n\n\n\n

I made a class Particle to use this code also in other applications easily, maybe.<\/p>\n\n\n\n

\"\"<\/a>
The snow is visible from the window inside an imaginary house<\/figcaption><\/figure>\n\n\n\n
# pygame.math module\n# https:\/\/www.pygame.org\/docs\/ref\/math.html\n#\n# Pygame swap text with another text\n# https:\/\/stackoverflow.com\/questions\/60944070\/pygame-swap-text-with-another-text\/60953697#60953697\n#\n# GitHub - PyGameExamplesAndAnswers - Draw 2D - Particles\n# https:\/\/github.com\/Rabbid76\/PyGameExamplesAndAnswers\/blob\/master\/documentation\/pygame\/pygame_2D.md\n\nimport pygame\nimport random\nimport sys\n\nclass Particle:\n    def __init__(self):\n        pygame.init()\n        self.screen = pygame.display.set_mode((300, 300))\n        self.clock = pygame.time.Clock()\n        self.snow = pygame.image.load(\"snow.png\").convert()\n        self.cloud = pygame.image.load(\"cloud.png\")\n        self.window2 = pygame.image.load(\"window2.png\")\n        self.particles = []\n\n    def mainloop(self):\n        run = True\n        while run:\n            self.clock.tick(60)\n            for event in pygame.event.get():\n                if event.type == pygame.QUIT:\n                    run = False\n            # it adds particles until they are removed\n            # if the size - [2] - is smaller than 0\n            self.screen.blit(self.snow, (0,0))\n            self.particles_generator()\n            self.screen.blit(self.cloud, (-110,-100))\n            self.screen.blit(self.cloud, (-50, 250))\n            self.screen.blit(self.window2, (0, 0))\n            pygame.display.flip()\n\n        pygame.quit()\n        exit()\n    # list of particles\n\n    # the surface with the snow as a background\n    def particles_generator(self):\n        \"This makes the circles move rfrom random start position at the top until bottome and the disappear\"\n\n        # Every particle starts at a random horizontal position at the top\n        self.particles.append([\n        \t[random_pos(), 50], # [0][0] coordinates for circle posit.\n        \t[\n                random.randint(0, 20) \/ 10 - 1, # moves left or right\n                2], # goes down same speed\n        \trandom.randint(4, 6)]) # [0][2] size or radius\n\n        # Every particle  moves... if particles[2] (the radius) is >= than 0 it is removed\n        for particle in self.particles[:]:\n            # the starting point changes going right or left\n            particle[0][0] += particle[1][0] # the x movement random\n            particle[0][1] += particle[1][1] # the y movement fixed 2\n                                            # but increases down here\n            particle[2] -= 0.005 # the snowflake shriks\n            particle[1][1] += 0.01 # * random.randint(-3, 6) # increase down speed a bit\n            if particle[2] <= 0:\n                self.particles.remove(particle)\n\n        # draws a circle on the screen white, at x y corrds and with a ray of particle[2]\n        for particle in self.particles:\n            pos = particle[0][0]\n            speed = particle[0][1]\n            radius = particle[2]\n            # circle: surface, color, pos, radius\n            pygame.draw.circle(\n            \tself.screen,\n            \t(255, 244, 255), # color\n            \t(\n            \t\tround(pos), # Pos x, y\n            \t\tround(speed)), # direction \/ speed\n            \t\tround(radius)) # radius\ndef random_pos():\n\t\" to make a flame like particles [150, 20] # flame, so that all circles with start at the same point\"\n\treturn random.randint(0, 300)\n\t# return 150\n\n\n\nfx = Particle()\nfx.mainloop()\n<\/pre>\n\n\n\n
Single images<\/p>\n\n\n\n
\"\"<\/a>
snow<\/figcaption><\/figure>\n\n\n\n
\"\"<\/a>
cloud<\/figcaption><\/figure>\n\n\n\n
\"\"<\/a>
window<\/figcaption><\/figure>\n\n\n\n
\r\n