implement block class

module/block.py

@@ -0,0 +1,54 @@
+from module import COLORS
+
+class Block:
+    id = ''
+    color = ''
+    flowable = False # 可流动
+    fallible = False # 可下坠
+    collision = True # 可以碰撞
+
+    def __init__(self, x: int, y: int):
+        self.x = x
+        self.y = y
+
+
+class GrassBlock(Block):
+    id = 'grass'
+    color = COLORS.get(id)
+
+    def __init__(self, x: int, y: int):
+        super().__init__(x, y)
+
+
+class DirtBlock(Block):
+    id = 'dirt'
+    color = COLORS.get(id)
+
+    def __init__(self, x: int, y: int):
+        super().__init__(x, y)
+
+
+class SandBlock(Block):
+    id = 'sand'
+    color = COLORS.get(id)
+    flowable = True
+
+    def __init__(self, x: int, y: int):
+        super().__init__(x, y)
+
+
+class StoneBlock(Block):
+    id = 'stone'
+    color = COLORS.get(id)
+
+    def __init__(self, x: int, y: int):
+        super().__init__(x, y)
+
+
+class AirBlock(Block):
+    id = 'air'
+    color = COLORS.get(id)
+    collision = False
+
+    def __init__(self, x: int, y: int):
+        super().__init__(x, y)