created surface.py and GameSurface class

pocket_friends/game_files/elements/surface.py

@@ -0,0 +1,46 @@
+"""Module to aid in the drawing of surfaces to make switching from one screen to another easier."""
+import pygame
+from ..io.input_handler import InputHandler
+
+
+class GameSurface(pygame.Surface):
+    """
+    Class to be used as the backbone of all game surfaces.
+    Attributes:
+        running (bool): Boolean to tell whether the surface is running or not.
+        next_surface (:obj:`str`): What the next surface should be after halting.
+        resource_dir (:obj:`str`): The path of the game's main resource directory.
+        game_fps (int): How many frames per second the game will run at.
+        additional_args (dict): Additional arguments to send to the next surface after halting.
+    """
+    def __init__(self, game_res, resources_dir, game_fps):
+        """
+        Create a GameSurface object.
+        Args:
+            game_res (int): The internal resolution of the surface.
+            resources_dir (:obj:`str`): The path of the game's main resource directory.
+            game_fps: (int): How many frames per second the game will run at.
+        """
+        super().__init__(game_res, pygame.SRCALPHA)
+        self.running = True
+        self.next_surface = None
+        self.resource_dir = resources_dir
+        self._clock = pygame.time.Clock()
+        self.game_fps = game_fps
+        self._input_handler = InputHandler(self._clock)
+        self.additional_args = {}
+
+        self._bg = pygame.image.load(self.resource_dir + '/images/bg.png').convert_alpha()
+        self.sprites = pygame.sprite.Group()
+
+    def preprocess(self):
+        """
+        Advance the surface by one frame and draw the background.
+        """
+        self._clock.tick(self.game_fps)
+
+        self.blit(self._bg, (0, 0))
+        self.sprites.update()
+        self.sprites.draw(self)
+
+        self._input_handler.update()