Vehicle (walking) background.

[koperkapel.git] / koperkapel / scenes / level.py

diff --git a/koperkapel/scenes/level.py b/koperkapel/scenes/level.py
index 6537e5c05e46067306317548feb21ddf95a3c4df..5c86629078551df0d69459b20d61b77b08093ffa 100644 (file)
--- a/koperkapel/scenes/level.py
+++ b/koperkapel/scenes/level.py
@@ -1,40 +1,42 @@
 """Render a level"""
 
-import json
-import os
-
 from pgzero.constants import keys
-from pgzero.loaders import images
+from pygame import Surface
+from ..loaders.levelloader import levels
 from .base import Scene, ChangeSceneEvent
-from .constants import TILE_SIZE, LEVEL_PATH
+from ..constants import TILE_SIZE
 
 
 class LevelScene(Scene):
     """ Level scene. """
 
-    def __init__(self, level_name):
-        self._level_name = level_name
-        f = open(os.path.join(LEVEL_PATH, level_name + '.json'))
-        level_data = json.load(f)
-        f.close()
-        self._tiles = level_data['tiles']
-        self._load_tile_images()
-
-    def draw(self, screen):
+    def enter(self, world):
+        self._level_data = levels.load(world.level.name)
+        self._tiles = self._level_data['tiles']
+        self._surface = None
+        self._render()
+
+    def _render(self):
+        # We cache the rendered surface to avoid doing a large number
+        # of blits each frame, as that introduces a large performance
+        # overhead.
+        self._surface = Surface((len(self._tiles[0]) * TILE_SIZE,
+                                 len(self._tiles) * TILE_SIZE))
+        for y, row in enumerate(self._tiles):
+            for x, tile in enumerate(row):
+                pos = (x * TILE_SIZE, y * TILE_SIZE)
+                if 'image' not in tile:
+                    # Skip broken tiles for now
+                    continue
+                self._surface.blit(tile['image'], pos)
+
+    def draw(self, screen, viewport):
         screen.clear()
-        #screen.draw.text("This is level {}".format(self._level_name), (200, 100))
-        for tile in self._tiles:
-            pos = tile['pos']
-            pos = [pos[0] * TILE_SIZE, pos[1] * TILE_SIZE]
-            if not 'image' in tile:
-                # Skip broken tiles for now
-                continue
-            screen.blit(tile['image'], pos)
-
-    def _load_tile_images(self):
-        """Load all the tile images"""
-        for tile in self._tiles:
-            tile['image'] = getattr(images, tile['base'])
+        # Viewport is the position of the screen relative to the
+        # surface. We need the position of the surface relative to
+        # the screen for the blit, so this conversion
+        screen_pos = -viewport[0], -viewport[1]
+        screen.blit(self._surface, screen_pos)
 
     def on_key_down(self, key, mod, unicode):
         if key == keys.ESCAPE: