fix collision detection issue

main.py

@@ -1,7 +1,7 @@
 import pygame
 
 from module import WIDTH, HEIGHT, BLOCK_SIZE, PLAYER_SPEED, GRAVITY, COLORS
-from module.block import AirBlock, GrassBlock, StoneBlock, SandBlock, WaterBlock
+from module.block import GrassBlock, StoneBlock, SandBlock, WaterBlock
 from module.player import Player
 from module.utils import generate_terrain
 
@@ -11,7 +11,7 @@ screen = pygame.display.set_mode((WIDTH, HEIGHT))
 clock = pygame.time.Clock()
 
 world = generate_terrain()
-player = Player()
+player = Player(world)
 
 # 游戏循环
 running = True
@@ -28,18 +28,18 @@ while running:
             block = world[bx][by]
             if event.button == 1:  # 左键放置方块
                 if block.id == "air":
-                    world[bx][by] = player.selected_block(bx, by)
+                    player.put_block(bx, by)
             elif event.button == 3:  # 右键拆除方块
-                world[bx][by] = AirBlock(bx, by)
+                player.put_block(bx, by, 'delete')
         elif event.type == pygame.KEYDOWN:
             if event.key == pygame.K_1:
-                player.selected_block = GrassBlock
+                player.select_block(GrassBlock)
             elif event.key == pygame.K_2:
-                player.selected_block = StoneBlock
+                player.select_block(StoneBlock)
             elif event.key == pygame.K_3:
-                player.selected_block = SandBlock
+                player.select_block(SandBlock)
             elif event.key == pygame.K_4:
-                player.selected_block = WaterBlock
+                player.select_block(WaterBlock)
 
     # 玩家移动
     keys = pygame.key.get_pressed()
@@ -67,7 +67,9 @@ while running:
     screen.fill(COLORS["air"])
     for row in world:
         for block in row:
-            if block.id != "air":
+            if block.id == "air":
+                continue
+
             rect = pygame.Rect(block.x * BLOCK_SIZE, block.y * BLOCK_SIZE, BLOCK_SIZE, BLOCK_SIZE)
             pygame.draw.rect(screen, block.color, rect)
 

module/block.py

@@ -11,6 +11,12 @@ class Block:
         self.x = x
         self.y = y
 
+    def get_screen_x(self):
+        return self.x * 20
+
+    def get_screen_y(self):
+        return self.y * 20
+
 
 class GrassBlock(Block):
     id = 'grass'

module/player.py

@@ -1,19 +1,42 @@
+from typing import Type, Literal
+
 from module import WIDTH, HEIGHT, JUMP_FORCE
-from module.block import AirBlock
+from module.block import AirBlock, Block
 
 
 # 玩家类
 class Player:
-    def __init__(self):
-        self.x = WIDTH // 2
-        self.y = HEIGHT // 2
+    def __init__(self, world: list[list[Block]]):
+        self.x = 100
+        self.y = 100
         self.velocity = 0
         self.on_ground = False
         self.selected_block = AirBlock
+        self.world = world
 
     def move(self, dx, dy):
+        world_position = {'x': int(self.x) // 20, 'y': int(self.y) // 20}
+
+        # TODO：Need to judgment x and y in order not to raise Index Out Of Range Error
+        top_block = self.world[world_position['x']][world_position['y'] - 1]
+        button_block = self.world[world_position['x']][world_position['y'] + 1]
+        left_block = self.world[world_position['x'] - 1][world_position['y']]
+        right_block = self.world[world_position['x'] + 1][world_position['y']]
+
+        if dx < 0 and left_block.collision:
+            new_x = left_block.get_screen_x() + 30
+        elif dx > 0 and right_block.collision:
+            new_x = right_block.get_screen_x() - 10
+        else:
             new_x = self.x + dx
+
+        if dy < 0 and top_block.collision:
+            new_y = top_block.get_screen_y() + 30
+        elif dy > 0 and button_block.collision:
+            new_y = button_block.get_screen_y() - 10
+        else:
             new_y = self.y + dy
+
         if 0 <= new_x < WIDTH and 0 <= new_y < HEIGHT:
             self.x = new_x
             self.y = new_y
@@ -22,3 +45,14 @@ class Player:
         if self.on_ground:
             self.velocity = JUMP_FORCE
             self.on_ground = False
+
+    def select_block(self, block: Type[Block]):
+        self.selected_block = block
+
+    def put_block(self, x: int, y: int, action: Literal['create', 'delete'] = 'create'):
+        if action == 'create':
+            self.world[x][y] = self.selected_block(x, y)
+        elif action == 'delete':
+            self.world[x][y] = AirBlock(x, y)
+        else:
+            pass