{"id":8784,"date":"2021-03-06T09:02:10","date_gmt":"2021-03-06T08:02:10","guid":{"rendered":"https:\/\/pythonprogramming.altervista.org\/?p=8784"},"modified":"2021-04-04T22:37:09","modified_gmt":"2021-04-04T20:37:09","slug":"still-on-particles","status":"publish","type":"post","link":"https:\/\/pythonprogramming.altervista.org\/still-on-particles\/","title":{"rendered":"Still on particles"},"content":{"rendered":"\n

I am gonna make a tutorial about particles soon (I made it, it’s here<\/a>). You can preview the code here<\/a>.<\/p>\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 - snow_flakes_list\n# https:\/\/github.com\/Rabbid76\/PyGameExamplesAndAnswers\/blob\/master\/documentation\/pygame\/pygame_2D.md\n\nimport pygame\nimport random\nimport sys\n\n\npygame.mixer.init()\npygame.mixer.music.load(\"snow.mp3\")\nFPS = 30\n\n\nclass Particle:\n    \"Makes particles to appear on the screen\"\n\n    def __init__(self):\n        \"Setting up screen, clock and loading images\"\n\n        pygame.init()\n        \n        # the two main surfaces\n        self.screen = pygame.display.set_mode((1400, 900), pygame.RESIZABLE)\n        self.new_surface = pygame.Surface((1400, 900))\n\n        self.frame_rate = pygame.time.Clock().tick\n        # loading images for the script\n        self.bg = pygame.image.load(\"catbg2.png\").convert_alpha()\n        # self.cloud = pygame.image.load(\"cloud.png\").convert_alpha()\n        self.fg = pygame.image.load(\"cat3.png\").convert_alpha()\n        self.snow_flakes_list = []\n        self.rain_drops_list = []\n        self.resize = 0\n\n    def update(self):\n        \"How to quit the window\"\n        self.frame_rate(FPS)\n        for event in pygame.event.get():\n            if event.type == pygame.QUIT:\n                self.run = False\n            if event.type == pygame.VIDEORESIZE:\n                self.resize = 1\n                self.w, self.h = event.w, event.h\n        # ====================================== background\n        self.new_surface.blit(self.bg, (0, 0))\n        self.snow_flakes_generator() # ============= particles\n        self.new_surface.blit(self.fg, (0, 0))\n        # ====================================== foreground\n        if self.resize:\n            self.screen.blit(pygame.transform.scale(self.new_surface.convert_alpha(), (self.w, self.h)), (0, 0))\n        else:\n            self.screen.blit(self.new_surface.convert_alpha(), (0, 0))\n        pygame.display.flip()\n\n    def mainloop(self):\n        \"A call to the self.update method to run stuffs\"\n        \n        # Start the mp3 loaded at the beginning\n        pygame.mixer.music.play()\n        self.run = True\n        while self.run:\n            run = self.update()\n        pygame.quit()\n        exit()\n\n    # the surface with the snow as a background\n\n    def generate_one_particle(self, dim):\n        direction = [random_pos(), random.randint(1, 5)]\n        # direction of x and next y pos incremented of 0.01\n        # change the 2 to change the way the snow flake falls\n        angle_vel = [random.randint(0, 20) \/ 10 - 1, 2]\n        radius = random.randint(4, 6)\n        if dim == 4:\n            angle_vel = [0, 7]\n            radius = 1\n        return [direction, angle_vel, radius]\n\n    def snow_flakes_generator(self):\n        \"circles move from random start position at the top until bottom and the disappear\"\n        self.snow()\n        self.rain()\n\n    def snow(self):\n        self.snow_flakes_list.append(self.generate_one_particle(6))\n        self.color = (255, 255, 255)\n        self.gravity = 0.01\n        self.falling_elements(self.snow_flakes_list)\n        \n    def rain(self):\n        for drop in range(20): # 5 drops for frame\n            self.rain_drops_list.append(self.generate_one_particle(4))\n        self.color = (200, 200, 200)\n        self.gravity = 0.05\n        self.falling_elements(self.rain_drops_list)\n\n    def falling_elements(self, elements_list):\n\n        # Every particle  moves... if snow_flakes_list[2] (the radius) is >= than 0 it is removed\n        for particle in elements_list:\n            \n            # parameters for new position (aka speed) and shrinking\n            direction = particle[1][0]      # random direction fixed\n            velocity = particle[1][1]  # how fast the flake falls\n            gravity = self.gravity           # how fast it falls\n            melting = 0.005         # how fast it shrinks\n\n            # DIRECTION\n            particle[0][0] += direction # increase the x position of an angle (to the right or left)\n            particle[0][1] +=  velocity # the y movement going down speed fixed 2\n                                            # but it is increased of 0.01 down here, so it goes down at the same speed\n            particle[2] -= melting # the snowflake shriks\n            particle[1][1] += gravity # * random.randint(-3, 6) # increase down speed a bit\n            if particle[0][1] > 750: # when the radius is 0 it is removed, so we do not see it anymore and it's not in the memory\n                elements_list.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 elements_list:\n            pos = particle[0][0]\n            speed = particle[0][1]\n            radius = particle[2]\n            # circle: surface, color, pos, radius\n            # self.new_surface.set_alpha(122)\n\n            pygame.draw.circle(\n            \tself.new_surface,\n            \t(self.color), # 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 snow_flakes_list [150, 20] # flame, so that all circles with start at the same point\"\n\treturn random.randint(30, 800)\n\t# return 150\n\n\n\nfx = Particle()\nfx.mainloop() # => self.update => snow_flake_generator =>\n<\/pre>\n\n\n\n
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